I think my favorite thing about Jafro is that he will do something to prove a point on camera solely to educate the masses, he already knows what the outcome is going to be but does it anyway to give an exact example of why he's going to do the repair that he's going to do so people can not only follow his logic but also develop logical problem solving skills themselves. What a beautiful human.
I actually love that you talk through the entire video. There's plenty of guys on here that don't say anything in an entire video and that gets old and is harder to follow. You're very unique!
"This is just like a leak down test except that it's the exact opposite..." Hahaha love it. What do you mean I took that out of context? Excellent video as always. Making me want to dig into an engine that doesn't even need it.
P.S. Just a thought and hope you don't mind my over participation in your comment section. Could you use a shop vac to pull the vacuum you need? Would be pretty simple to rig up a seal for the hose and attach it to that same gauge. A quick search seems to imply they simply won't pull enough vacuum, ironically.
I like how the digital calipers & dykem magicly moved themselves while you were cleaning the bench around 42:55..I had to watch that part again to make sure I saw what I saw.. Thanks for another informative video..
Great video! I had to wait quite a few days to watch this, as I had the minor matter of my first child being born the day you uploaded. He’s sitting on my lap very calmly taking everything in, and, if he’s anything like his dad, he’ll be a huge Jafro fan as well. Thanks again for the content.
Being able to watch Fuzzy Dice Projects valve lapping job, followed by Jafro's a few days later; is the miracle of RUclips! Both enjoyable videos, for very different projects and builders!
Jafro, I just want to say thank you so much for these videos. I changed my first DSM clutch with your help like a decade ago. I learned to tune from your videos, timing, cam swaps, so many car related things I’ve managed to do, I can directly credit your clear, detailed explanations. I am just about to slap the head on my first engine build, a forged internal 7 bolt, and again, your videos took all the guesswork and worry out of it. Thanks a million, some day I’d like to shake your hand. One thing, though... can I convince you to daily a 2009 Hyundai Azera LTD so I can figure out how to make my accessory fan work again?
Also it’s so refreshing to see another one of these videos! I was looking up ways to tip valves at home, but I’ve come up with attaching a V-block to my bench grinder after dressing the stone I’ll be using. If you have any tips for tipping my valves at home, please let me know!
Only thing left is to check the installation height and coil bind. I am glad that the replacement head was in such good condition. Money saved paid for the tools and that is always a win win.
It's such a satisfying pop! There's a lot of satisfying things about taking the time to do this job right. It makes all the little sounds and messes you create doing it a little bit endearing. The vacuum tester does a great one, too!
LoL, I love your channel man. The first time I needed a vacuum source I skipped the hand pump and went for the Venturi pump, this vid proves I made the right choice. BTW, IMO the hand vacuum pump is useful for the brake system, for everything else it’s simply inadequate.
Prussian blue is used in _very_ thin laters to show where contact is happening between faces. It can be used to create precision flat surfaces within tenths, but it's rather finnicky to use. Very good point with the cheap digital calipers, I use a set of Fowler digital calipers around my shop only for rough checks just as you do the harbor freight jobbies. I'm a machinist so have plenty of higher quality measuring equipment for QC. Not all digital tools are created equal, I'm a big fan of Mitutoyo Quantumikes. The big difference is, of course, cost! You get what you pay for never holds so true as when you're dealing with precision measuring equipment.
Man that was awesome, thank you so much. That really explains a lot past just the motions of going through it. All the context and addendums are so appreciated, and I can't say the humor isn't a good addition 😂
you are never better served than by yourself, thank you for this precise and very informative presentation and de 2 minutes of shut up silence ;-) Cheers from Geneva Switzerland
I've previously made a Vacuum Tester with an AC manifold gauge set, AC Vacuum Pump, used the rubber from a suction cup with a threaded fitting in the center. Works likes a charm. I was to cheap to buy the adapter plates on the fleabay for $150.
I did the same - used a piece of rigid vinyl flooring with a rubber backing cut to size and tapped hole through it to add the suction hose. super effective. Calmed my worries that my lapping wasn't u to snuff.
Good timing Jafro, I have to inspect some heads soon. Never really knew how to inspect the guides, and here we are. Just bought some Mitutoyo small bore gauges surprisingly cheap on the flea bay.
"Hit that like button if I should SHUT UP more often" So does that mean I am supposed to hit dislike if I want you to keep talking? No, but in all honesty, I am a car mechanic in training, and I am learning more in your videos than I ever have in school the past two years. So by all means, KEEP TALKING! ;P
Great helpful video, and really good voiceover too. I'm in the process of rebuilding a similar Nissan CA18DET cylinder head and modifying it for better gasflow. I've got a very good idea of what needs doing but I've never done this before and your video gave me a good idea for testing the valve guides and seats. I have to say, those Mitsubishi port bowls are horrible for the era, a little time with some 120-grit sand paper would improve them and cylinder-filling enormously. Some of the lumps in the combustion chamber are also shocking, a hammer and chisel might be suitable!
I’m sorry I got here late. Work then had to get milk. Since the last video I got a new Subaru wrx. Premium performance pack, the one with the brembos. Sorry if no one cares but I needed to tell people, I’m so hyped!
I have a digital calliper here. It uses 3 measurements. MM inch, & fractional. It came with a calibration certificate, meaning it is extremely accurate. It should be, as it cost me a small fortune, not one of those $40 jobs either. I used to fix cars too, and this often included major reco work.
I do like to add not all calipers are bad. I work as a machinist and we use calipers that measures dead accurate on 0.01mm which is constantly confirmed by micrometers. But those calipers cost 480 bucks each. And after little over 2 years of use they become sloppy and only measures +-0.01 off the real measurement and at that point the caliper gets retired as welding calipers. They can be maintained by taking them apart and getting new copper springs (looks kinda like the springs used on a apex seal on a rotary engine)
You're illustrating *exactly* the point I was making! $20≠$480. $480 is more than the .0001" micrometers. People are going to roast me when I rely on a digital tool in the next video.
@@Jafromobile I only feared that everyone watching the video will start roasting machinists for using calipers. Keep up the amazing work on the videos, i and the rest of the viewers seriously appreciate it big time.
Jafro does it right, Fuzzy does it as good as it gets while being cheap. Takes almost as much knowledge to do it cheap and good enough as it does to do it right.
I think I almost cried watching the fuzzy dice video on the valves. As soon as a drill was involved I knew it wouldn't end well, little did I know how bad it would be
@@Jafromobile If you're ever in Aus look me up. I'll take you for a hot lap. You're vids were the ones that gave me the confidence I could build that engine in my own shed.
@jafro 32:00 I'd do smth to plug the valve stem with a thick oil or some grease so I can focus the vacuum on the valve and seat contact. Love ur vids btw.
just love the detail of the sound change whyle laping the intake valves, if you are doing that with some kind of electric thing you cant listen to that! Like!
Use paint thinner. It's cheap, it's a little lubey, and it dissolves gunk very well. You can spray it on, walk away for a bit, and wipe the junk right off.
That is NOT how you use Prussian Blue my brother! 😂 you used enough Prussian Blue in this video for about 30,000 valves. It’s applied in the most absolute THINNEST coating. Since it’s a high visibility, high transfer dye, it will only rub off on the areas making contact, kind of like a wet marker. This allows you to see the contact made between the valve and seat. I’ve used it to great success on two of my high horsepower Subaru engines, and right now on my RB26. But I still end up rechecking the valve sealing integrity with isopropyl alcohol 😂 Prussian Blue is faster and less toxic, just as long as you don’t eat it. I think it contains cyanides lol
@@Milkmans_Son yes it's just a basic way to measure the thickness of the lap line on the valve & seat as it's not important measurement compared to crank bearing tolerance
Jafro, if you worked on an old British car like a Triumph Vitesse you would realise how good your valve seats are. I used to be happy if I got a seal all round, nevermind how wide it was!
I take absolutely none of this for granted. I have never seen any used 4g63 ever produce seats and valve guides like this. That's one of the reasons this video was such a joy to make!
So I'm guessing we will not be doing a full Port and Polish on this head, just the normal run through rebuild?? I look forward to your choice of parts, and tools........
Nice work, the cleaner it is the less likely something will be stuck in a crevice that could cause an issue later on. Digital calipers are great….for measuring brake rotors, or radiator hose inlets, or maybe o-rings, that kind of stuff. Great point in the video!
hi jafro, Can i use 2.0cfm single stage vacuum pump for this job, by the way im planning to do valve job on my bike which has done 60000km (R15 V3). And I appreciate you taking the time and making the effort to make the information shared more understandable.
Is there such a rebuild kit to close valve guides? Like spring stock, made like a roll pin? Purposely too big, allowing a hone to sneak up on? I'm surprised if they don't- like a Heli-Coil insert works. Did I just invent something? Is it easier/cheaper/feasible to buy new guides and tap into place? You sleeve a crankshaft, what's the difference?
Well... the valve guides are inserts of sorts, themselves... I get what you mean. With all the layers, heat would be a problem. Probably best to just upgrade the guide to one made from better stuff.
Based on what Jafro said in this video,vand the fact that any kind of sleeve insert would require the same work, it's best to just replace the guides if they're worn out of spec/preference. Any change to the throat where the valve itself rides requires you to at a minimum check the seat contact, and most likely requires having the seats recut - and that's simply because the valve won't be in exactly the same position. So just replace the guides and have the seats recut if they (the guides) are worn. :)
Kinda sad that the screen door didn't get the Flintstones treatment LOL. Great episode once again. Somehow you are uploading way more often now than project binky and I've never been happier! Keep it up! I would Patron you but poor man is poor. :/
I am going to be a curious George. We use torque plates to hone perfect cylinder wall shape. But when lapping not using torque plates. Seems like there would be some to significant distortion with 140 ft-lbs of torque squishing on the heads. So curious me thinking that once you bolt your heads on, you might see a reduction in suction. And even more curious would be lapping valve with a torque plate then comparing from above would be an improved seal.
Almost certainly overkill, but you're working those thinking muscles! Nothing wrong with that! Remember that the valve seats are hardened steel inserts, so they're 1-piece rings. Even if the head managed to warp by a tiny percentage of a thousandth of an inch, the ring is pressed into the head and is a separate part from the aluminum casting. It's much harder, and less malleable than the head. So it's unlikely to measurably distort from the torque load of the head bolts.
@@Jafromobile Did some googling, kind of disagree that 6 bolts around aluminum which is 1/3 as stiff as steel would not distort with around 15,000 lbs proof load each bolt. Albeit the steel ring inserts offer some stiffness. It the looks like DSPORT got the same thinking. It looks like the first and last cylinders distort up to 11 to 16% leakage. dsportmag.com/the-tech/head-torque-plate-solutions-save-valves-and-improve-efficiency/
I watched the cylinder head port and polish to a mirror finish on the intake ports video and I am building a v8 right now.. Question: I’m wondering if you have changed your mind about the fish on the intake ports or does it still stand?
Liked the video but please don't talk much less... it's partly the reason why I watch this channel, it's extremely informative and I love the shade you throw at medium-brained professionals.
I would of gave the video a like, .. but I really enjoy the commentary you do on your videos.. haha. I would love it if you would port a honda head sometime and on your spare time.. the accord 2000 models are plentiful in the yard and its what I'm building at the moment. The f23a1-a4 engines and heads are really looked past and laughed at for making power.. I'm running a gt35 turbo on my 95 accord now and tuning it myself, I would love to squeeze out more power from my head somehow
That was the best testing of a cylinder head valve Job i have ever seen. Even in my old shop class we never used vacuum on a cylinder head. Well I wonder how or if this would work on cylinder bores just as well. This would show how the ring gap affects how the cylinders seals 🦭 🦭. Thank you for all your videos 📹. Be safe.
Thanks for all u have done Started with a 97 mirage 2dr 1.8 To 1.8t pnp head thanks to u And now 2.4 all motor Dohc head swap parts on deck. Are u any good at 5sp lsd? Ideas on a road car? 06 eclipse trans
Calipers, especially, digital calipers.. hahah. They'll get you in the ball park. I'm glad you switched to a mic to get a more accurate measurement. 🤜🤛
yessir, I think most people can get by with a 2-3" micrometer for most engines with a set of callipers for everything else. better than relying on plastigage and callipers.
Cams/valves are 0-1", rods are 1-2", mains are 2-3", pistons are 3-4". You actually do need a full set of 0-4" Mics for a 4g63. It's true that you can creatively cheat your way around some of those measurements with plastigauge, but if it's the only measurements you used, it increases the anxiety levels a bit the first time you fire it up.
@@Jafromobile yep, the proper tools are always what you need but people are out there building with callipers and plastigage and it makes me nervous. the 4g63 needs the 1-2" for the rods and 2-3" for the mains, you might as well get the full set at that point. I was just trying to point out that anyone not building a 4g63 should at least spring for a 2-3" micrometer as that is the mic that will cover most rods and mains on most engines.
Fantastic, thorough work and expert explanation. Thank you Jafro!
You reminded me of a thing... You are the man, man!
Hey I was just rewatching all your Street Sleeper vids, great stuff!
Miss your vids TT. Here’s to the classics! Some of the best builds on all of RUclips.
Collaboration between Tom n Jafro?!!! What a wonderful idea!!
@@kenxiong6830 "Jafro gives Tom head......s for his LS Miata"
"everyone quiet down! 4g63 class is now in session!"
I know right? Things we actually want to learn from someone how knows what to do.
today July 18 2023 saw your face for the first time in nearly 10 years of watching your videos. ty for that!
I think my favorite thing about Jafro is that he will do something to prove a point on camera solely to educate the masses, he already knows what the outcome is going to be but does it anyway to give an exact example of why he's going to do the repair that he's going to do so people can not only follow his logic but also develop logical problem solving skills themselves. What a beautiful human.
"these things make precision guestimates"
i'm dead. jafro wins.
ruclips.net/video/uOk5L8Q__as/видео.html
Good, in this video, it also a good way to remove a valve seat ring.
I actually love that you talk through the entire video. There's plenty of guys on here that don't say anything in an entire video and that gets old and is harder to follow. You're very unique!
Most comprehensive & informative video on valve lapping issue.
Thank you.
Jafro uploaded! Today's Patreon was a good day.
"This is just like a leak down test except that it's the exact opposite..." Hahaha love it. What do you mean I took that out of context? Excellent video as always. Making me want to dig into an engine that doesn't even need it.
P.S. Just a thought and hope you don't mind my over participation in your comment section. Could you use a shop vac to pull the vacuum you need? Would be pretty simple to rig up a seal for the hose and attach it to that same gauge. A quick search seems to imply they simply won't pull enough vacuum, ironically.
I get it! I want to do it to the Hyundai now.
Yeah, they're low-pressure. Comments are for discussions. Be my guest!
40:00 beard game looking STRONG : D This video was killer, keep 'em coming : D
Right??!!
Hahaha I thought the same.
4g63 Gandolph needs one.
7:22 Like throwing a hotdog down a hallway....
I like how the digital calipers & dykem magicly moved themselves while you were cleaning the bench around 42:55..I had to watch that part again to make sure I saw what I saw.. Thanks for another informative video..
Great video! I had to wait quite a few days to watch this, as I had the minor matter of my first child being born the day you uploaded. He’s sitting on my lap very calmly taking everything in, and, if he’s anything like his dad, he’ll be a huge Jafro fan as well. Thanks again for the content.
Great channel and I don’t even own a dsm or a 4 cylinder for that matter.
Checking in from short pump.
RVA in the hizzy! The good news is all of this works on everything but a Tesla!
Being able to watch Fuzzy Dice Projects valve lapping job, followed by Jafro's a few days later; is the miracle of RUclips!
Both enjoyable videos, for very different projects and builders!
Jafro: "you really shouldn't lap a valve for anything other than checking the valve seals"
FDP: "lapping drill go brrrrr"
Wow Jafro thats why i follow u for years its so amazing how u teach men thank u for another great video
Jafro, I just want to say thank you so much for these videos. I changed my first DSM clutch with your help like a decade ago. I learned to tune from your videos, timing, cam swaps, so many car related things I’ve managed to do, I can directly credit your clear, detailed explanations. I am just about to slap the head on my first engine build, a forged internal 7 bolt, and again, your videos took all the guesswork and worry out of it. Thanks a million, some day I’d like to shake your hand. One thing, though... can I convince you to daily a 2009 Hyundai Azera LTD so I can figure out how to make my accessory fan work again?
I learn more from you , than what i did in 20 years of school. do not quit !
38:03 Nice penus pump you have there Jafro. Thanks for the content.Keep the good work !
awesome vid. also gave the hand vac pump a reason to exist.
Everyone is entitled to complain about them, but you can't argue with the results they can produce!
Also it’s so refreshing to see another one of these videos! I was looking up ways to tip valves at home, but I’ve come up with attaching a V-block to my bench grinder after dressing the stone I’ll be using. If you have any tips for tipping my valves at home, please let me know!
Only thing left is to check the installation height and coil bind. I am glad that the replacement head was in such good condition. Money saved paid for the tools and that is always a win win.
I had a good laugh at the "pop" the suction cup made during the no voiceover section.
It's such a satisfying pop! There's a lot of satisfying things about taking the time to do this job right. It makes all the little sounds and messes you create doing it a little bit endearing. The vacuum tester does a great one, too!
LoL, I love your channel man. The first time I needed a vacuum source I skipped the hand pump and went for the Venturi pump, this vid proves I made the right choice. BTW, IMO the hand vacuum pump is useful for the brake system, for everything else it’s simply inadequate.
Those fractions on the feelers are genuinely amusing as an Aussie lol equally confusing too!
I want a set of wrenches on those sizes!
Prussian blue is used in _very_ thin laters to show where contact is happening between faces. It can be used to create precision flat surfaces within tenths, but it's rather finnicky to use.
Very good point with the cheap digital calipers, I use a set of Fowler digital calipers around my shop only for rough checks just as you do the harbor freight jobbies. I'm a machinist so have plenty of higher quality measuring equipment for QC. Not all digital tools are created equal, I'm a big fan of Mitutoyo Quantumikes. The big difference is, of course, cost! You get what you pay for never holds so true as when you're dealing with precision measuring equipment.
hello, it was a nice video, thank you, thank you. I have been busy with this job for 30 years, now technology has developed a lot in this field.
The real deal, thank you for your authentic videos and help,. its beyond helpful to see and hear your thoughts as you work, Most Excellent
Man that was awesome, thank you so much. That really explains a lot past just the motions of going through it. All the context and addendums are so appreciated, and I can't say the humor isn't a good addition 😂
Totally chill performance as always - TY for sharing. :)
"My Precision estimating tool" Jafro BUD you are hilarious! please never quit the tube. Literally would be the saddest day in history.
you are never better served than by yourself, thank you for this precise and very informative presentation and de 2 minutes of shut up silence ;-) Cheers from Geneva Switzerland
I've previously made a Vacuum Tester with an AC manifold gauge set, AC Vacuum Pump, used the rubber from a suction cup with a threaded fitting in the center. Works likes a charm. I was to cheap to buy the adapter plates on the fleabay for $150.
I did the same - used a piece of rigid vinyl flooring with a rubber backing cut to size and tapped hole through it to add the suction hose. super effective. Calmed my worries that my lapping wasn't u to snuff.
Another great video it’s therapeutic to watch this keep them up 👍
my car is in the shop getting 2 new valves i can only hope the man doing the job is as pr0 as you, thank you for the video! It was great
Hell yeah, this makes my evening! Beats Netflix! Jafro and Chill...
Good timing Jafro, I have to inspect some heads soon. Never really knew how to inspect the guides, and here we are. Just bought some Mitutoyo small bore gauges surprisingly cheap on the flea bay.
"Hit that like button if I should SHUT UP more often"
So does that mean I am supposed to hit dislike if I want you to keep talking?
No, but in all honesty, I am a car mechanic in training, and I am learning more in your videos than I ever have in school the past two years. So by all means, KEEP TALKING! ;P
I skipped ahead. Love your chaos. Tis is exactly as it should be.
Have hit the like button though, as I love your vids. Keep it up!
great info!! consider a homemade fixture to check for valve face runout, small v-blocks with a dial indicator.
Jafro, Have you considered a video on lapping valves?
Could be a false memory but I recall a early video of him lapping valves manually.
Lol
@@yankumarrah Wait, yes, now I remember... but wasn't he using a 1/2 inch drill in that one?
Great helpful video, and really good voiceover too.
I'm in the process of rebuilding a similar Nissan CA18DET cylinder head and modifying it for better gasflow. I've got a very good idea of what needs doing but I've never done this before and your video gave me a good idea for testing the valve guides and seats.
I have to say, those Mitsubishi port bowls are horrible for the era, a little time with some 120-grit sand paper would improve them and cylinder-filling enormously. Some of the lumps in the combustion chamber are also shocking, a hammer and chisel might be suitable!
We need to get jafro over 1m subs! All in hopes to see more videos like this more often 😁
I like your thinking!
@@Jafromobile you should do a collab with some other 4G guys. There's so many damn combinations of 4G Frankenstein fuckery you can build lol.
I’m sorry I got here late. Work then had to get milk. Since the last video I got a new Subaru wrx. Premium performance pack, the one with the brembos. Sorry if no one cares but I needed to tell people, I’m so hyped!
Also
JAFRO!!!!!!
I have a digital calliper here. It uses 3 measurements. MM inch, & fractional. It came with a calibration certificate, meaning it is extremely accurate. It should be, as it cost me a small fortune, not one of those $40 jobs either. I used to fix cars too, and this often included major reco work.
So you get why I'm picking on the $20 units... ;)
@@Jafromobile yes, I do. I'm the same. I pick on cheap & nasty tools too. :)
I do like to add not all calipers are bad. I work as a machinist and we use calipers that measures dead accurate on 0.01mm which is constantly confirmed by micrometers. But those calipers cost 480 bucks each. And after little over 2 years of use they become sloppy and only measures +-0.01 off the real measurement and at that point the caliper gets retired as welding calipers. They can be maintained by taking them apart and getting new copper springs (looks kinda like the springs used on a apex seal on a rotary engine)
You're illustrating *exactly* the point I was making! $20≠$480. $480 is more than the .0001" micrometers. People are going to roast me when I rely on a digital tool in the next video.
@@Jafromobile I only feared that everyone watching the video will start roasting machinists for using calipers.
Keep up the amazing work on the videos, i and the rest of the viewers seriously appreciate it big time.
Watching this after Fuzzydice projects "Valve Job" is therapeutic :P
Jafro does it right, Fuzzy does it as good as it gets while being cheap. Takes almost as much knowledge to do it cheap and good enough as it does to do it right.
@@NuclearHeadshot No, I do it cheap, too! The Hyundai's here for contrast. ;)
I think I almost cried watching the fuzzy dice video on the valves. As soon as a drill was involved I knew it wouldn't end well, little did I know how bad it would be
Amazing content as always. Jafro, please do a Port and Polish, Valve guide for a Turbo Diesel
Jafro your the man. No other channel out there like yours bud. 👌. I love it.
Tons of information, thank you.
Stop being so damn awesome Jafo, also all the things Ive learned from you, put into practice came to fruition on Sunday with a track day. Vid is up.
No joke people, go look at what he built!
@@Jafromobile If you're ever in Aus look me up. I'll take you for a hot lap. You're vids were the ones that gave me the confidence I could build that engine in my own shed.
@@vlad7951 Its not hidden mate. The algorithm just hates me
@jafro 32:00 I'd do smth to plug the valve stem with a thick oil or some grease so I can focus the vacuum on the valve and seat contact. Love ur vids btw.
Well nvm, should've watched the whole vid before commenting 😆
😂
The good thing about brand new Viton is they don't leak at all! Same reading either way!
Saw the original non valve job, also excellent, explanatory. And hilarious. Subbed
just love the detail of the sound change whyle laping the intake valves, if you are doing that with some kind of electric thing you cant listen to that! Like!
They are called guess-O-meters. In matching shops!
Or the approximator 2000
Uh oh im late... im still here!!! Love the content Jafro!
I love your videos, they're terrific! I could listen to you for hours...
If you do heads all the time, get a set of precision pins, it makes check heads quick and simple
The best video on this process. Thank you!
47mins, WE LEARNIN AGAIN BOYS.
The reward is big for those who make it to the end. I'm Jafro, and this is my MasterClass.
we need more of your videos please sir
I remember getting one of those harbor freight vacuum pumps... garbage.
It's not bad... it works... but it's not the one you want to use for AC work, that's for sure!
I think you did a good job on this one and some peeps will learn from it.
Must be Christmas, thanks for another great video!
I’m not sure there’s a sound more satisfying than hearing a well seated valve hit its seat.
I always learn something watching your videos
Jafro is the MAN! Great video and explanation.
Use your right hand to hold the mics by wrapping your pinky around the horse shoe. Then your left hand is free to hold the part.
this Jafromobile relationship on RUclips started over a bleeping port and polish on a cylinder head... how long has it been? 4 years?
Use paint thinner. It's cheap, it's a little lubey, and it dissolves gunk very well. You can spray it on, walk away for a bit, and wipe the junk right off.
subbed! thanks Jafromobile , repurposing a tool (hose kit) : priceless : ) Be Blessed!
That is NOT how you use Prussian Blue my brother! 😂 you used enough Prussian Blue in this video for about 30,000 valves. It’s applied in the most absolute THINNEST coating. Since it’s a high visibility, high transfer dye, it will only rub off on the areas making contact, kind of like a wet marker. This allows you to see the contact made between the valve and seat. I’ve used it to great success on two of my high horsepower Subaru engines, and right now on my RB26. But I still end up rechecking the valve sealing integrity with isopropyl alcohol 😂 Prussian Blue is faster and less toxic, just as long as you don’t eat it. I think it contains cyanides lol
Thanks so much Jafro :P
20:32 I'm looking at you fuzzy dice
I have now found Fuzzy dice because of my commenters. ☺️
@@Jafromobile if only he had seen this video before he did what he did to that poor old big block 😭
@@TJJIM that one valve... 😳 Eff it, full send...
Jafro! wanna see that gsx run ! keep it alive.
AMC gains and a jafro video! What a great day!
I use dry erase marker on the seats to check the contact pattern.
I use the measurements on the paper from plasti gauge to measure the lapped line on the valve i find this easier
Ok, but how do you measure the line on the paper?
@@Milkmans_Son you place the paper marks over the lapped area of the valve to line up the size
@@craigfiles7067 So you've done this?
@@Milkmans_Son yes it's just a basic way to measure the thickness of the lap line on the valve & seat as it's not important measurement compared to crank bearing tolerance
Jafro, if you worked on an old British car like a Triumph Vitesse you would realise how good your valve seats are. I used to be happy if I got a seal all round, nevermind how wide it was!
I take absolutely none of this for granted. I have never seen any used 4g63 ever produce seats and valve guides like this. That's one of the reasons this video was such a joy to make!
Jafro you sir are a rock star!👍🏼👍🏼
I needed this lecture, thank you
Jafro you should set up a tip option on your RUclips page. I really did appreciate the your teachings!
So I'm guessing we will not be doing a full Port and Polish on this head, just the normal run through rebuild??
I look forward to your choice of parts, and tools........
The parts video's already here! Barely anyone watched it. It's the April Progress video. It's where this other head showed up. ;)
Nice work, the cleaner it is the less likely something will be stuck in a crevice that could cause an issue later on.
Digital calipers are great….for measuring brake rotors, or radiator hose inlets, or maybe o-rings, that kind of stuff. Great point in the video!
hi jafro, Can i use 2.0cfm single stage vacuum pump for this job, by the way im planning to do valve job on my bike which has done 60000km (R15 V3). And I appreciate you taking the time and making the effort to make the information shared more understandable.
Is there such a rebuild kit to close valve guides?
Like spring stock, made like a roll pin? Purposely
too big, allowing a hone to sneak up on?
I'm surprised if they don't- like a Heli-Coil insert works.
Did I just invent something?
Is it easier/cheaper/feasible to buy new guides and tap into place?
You sleeve a crankshaft, what's the difference?
Well... the valve guides are inserts of sorts, themselves...
I get what you mean. With all the layers, heat would be a problem. Probably best to just upgrade the guide to one made from better stuff.
Based on what Jafro said in this video,vand the fact that any kind of sleeve insert would require the same work, it's best to just replace the guides if they're worn out of spec/preference. Any change to the throat where the valve itself rides requires you to at a minimum check the seat contact, and most likely requires having the seats recut - and that's simply because the valve won't be in exactly the same position. So just replace the guides and have the seats recut if they (the guides) are worn. :)
@@Broadpaw_Fox Just musing.
@@Jafromobile Just musing. I was under the impression the new parts (valve guides) were Unobtainium, by the way you were hand-wringing.
@@HUBBABUBBADOOPYDOOP Nah, the hand wringing is due to the expense of replacing them. Even the people who repair their guides do that. :)
Kinda sad that the screen door didn't get the Flintstones treatment LOL. Great episode once again. Somehow you are uploading way more often now than project binky and I've never been happier! Keep it up!
I would Patron you but poor man is poor. :/
I am going to be a curious George. We use torque plates to hone perfect cylinder wall shape. But when lapping not using torque plates. Seems like there would be some to significant distortion with 140 ft-lbs of torque squishing on the heads. So curious me thinking that once you bolt your heads on, you might see a reduction in suction. And even more curious would be lapping valve with a torque plate then comparing from above would be an improved seal.
Almost certainly overkill, but you're working those thinking muscles! Nothing wrong with that! Remember that the valve seats are hardened steel inserts, so they're 1-piece rings. Even if the head managed to warp by a tiny percentage of a thousandth of an inch, the ring is pressed into the head and is a separate part from the aluminum casting. It's much harder, and less malleable than the head. So it's unlikely to measurably distort from the torque load of the head bolts.
@@Jafromobile Did some googling, kind of disagree that 6 bolts around aluminum which is 1/3 as stiff as steel would not distort with around 15,000 lbs proof load each bolt. Albeit the steel ring inserts offer some stiffness. It the looks like DSPORT got the same thinking. It looks like the first and last cylinders distort up to 11 to 16% leakage.
dsportmag.com/the-tech/head-torque-plate-solutions-save-valves-and-improve-efficiency/
Hey Jafro!!! Can you make a vid on how to create your valve spring compressor tool? Pleeeeease 😁
I watched the cylinder head port and polish to a mirror finish on the intake ports video and I am building a v8 right now..
Question: I’m wondering if you have changed your mind about the fish on the intake ports or does it still stand?
Liked the video but please don't talk much less... it's partly the reason why I watch this channel, it's extremely informative and I love the shade you throw at medium-brained professionals.
Bearded Jafro is a productive Jafro.
I would of gave the video a like, .. but I really enjoy the commentary you do on your videos.. haha. I would love it if you would port a honda head sometime and on your spare time.. the accord 2000 models are plentiful in the yard and its what I'm building at the moment. The f23a1-a4 engines and heads are really looked past and laughed at for making power.. I'm running a gt35 turbo on my 95 accord now and tuning it myself, I would love to squeeze out more power from my head somehow
That was the best testing of a cylinder head valve Job i have ever seen. Even in my old shop class we never used vacuum on a cylinder head. Well I wonder how or if this would work on cylinder bores just as well. This would show how the ring gap affects how the cylinders seals 🦭 🦭. Thank you for all your videos 📹. Be safe.
I’d hit the like button but I do enjoy your voice overs. 😂 who am I kidding I hit the like button anyway.
Thanks for all u have done
Started with a 97 mirage 2dr 1.8
To 1.8t pnp head thanks to u
And now 2.4 all motor
Dohc head swap parts on deck.
Are u any good at 5sp lsd?
Ideas on a road car? 06 eclipse trans
Calipers, especially, digital calipers.. hahah. They'll get you in the ball park. I'm glad you switched to a mic to get a more accurate measurement. 🤜🤛
yessir, I think most people can get by with a 2-3" micrometer for most engines with a set of callipers for everything else.
better than relying on plastigage and callipers.
Cams/valves are 0-1", rods are 1-2", mains are 2-3", pistons are 3-4". You actually do need a full set of 0-4" Mics for a 4g63. It's true that you can creatively cheat your way around some of those measurements with plastigauge, but if it's the only measurements you used, it increases the anxiety levels a bit the first time you fire it up.
@@Jafromobile yep, the proper tools are always what you need but people are out there building with callipers and plastigage and it makes me nervous.
the 4g63 needs the 1-2" for the rods and 2-3" for the mains, you might as well get the full set at that point.
I was just trying to point out that anyone not building a 4g63 should at least spring for a 2-3" micrometer as that is the mic that will cover most rods and mains on most engines.
Thank you!!
MY DAWG!
@@802Garage my man!!
Metric also called science unit.
what a nice job. Where did you buy the vacuum pump?would you have a link? Thank you