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A bunch of subscribers questions answered
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- Опубликовано: 5 фев 2023
- In this, episode 80 of PowerTec 10 the late Marvin Burke, Andy Wood and DV answer many questions that had been highlighted during the 6 months or so preceding this live broadcast. There is about a 95% chance it will answer a question yopu may have had but you probably will need to take this video in 3 -4 bites - but it will be worth it.
This head along with that new piston design just released as of Fall 2023 would be incredible !!! And youre right in my own 7.3 i found more power when my exhaust looked like coffee with cream than it ever did blowing coal black After i did considerable flow work on that engine . Too many think that black means power . Not so , its not fully burned !!! And air bottled up as boost pressure doesnt have a chance to make power !!! It MUST FLOW !!!
David I LOVE you. Finally someone that put's it all together and isn't looking to take castrate you for some of their knowledge! Hey David if you ever want to adopt a 55 year old gearhead "old kid" I''m available. But really thank you soooo much!
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I hope everyone is alright, been over a week since the last posted video. I've gotten sort of antsy waiting for the next video!
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Thank you so much for educating me and others watching these fascinating videos! Did you have a tech column in Hot Rod, PHR, Super Chevy, or Carcraft at one time? I seem to remember seeing a sketch of you with your name in a magazine.
Love the statement regarding boost. So correct. Its what the engine couldnt consume. Said that for years most dont get it.
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Suggestion I learned from the advertising industry, that is VERY IMPORTANT!!!
Guys, keep your hands showing!
Put them on the desk or have them visible when not in use. Something about it increases your power and credibility during a presentation.
There is something disempowering/emasculating about cutting someone's hands off either with a video frame or however.
Men do things with our hands. Our hands represent our power. Having them cut off emasculates you in some weird psychological way.
Also, HANDLE THE CYLINDER HEAD AND MANIPULATE IT AROUND FOR US, because that is exactly what we would be doing if we were there! Those are absolutely gorgeous cylinder heads!!!
We wanna see the valve angles, the combustion chamber, the ports, and everything we can!
PS IS IT 7000 DOLLARS PER HEAD OR PER SET? You didn't make that clear.
Dear David, please upload more material I'm a huge fan and want to learn more from you ❤️
Great vidja 🤙🏼 R.I.P Marvin 🤙🏼
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I figured. Andy’s channel did the same to. Thanks brother 🤙🏼
Just got all the way through it in just two bites. It was all new to me because I didn't watch it when it came out on the old channel (never got around to it).
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@@jeppakongur Man I hate thieves, in person, on the internet or on the phone. They're all the same.
David, where can I get a Helgesen flow bench calibration plate? I tried making my own, but I couldn't get a smooth curve.
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Are you gonna do a video on how to diy flow bench? I'm begging you, PLEASE!!!!🙏
If you want to go more in depth than just a video, Mr. Vizard wrote a book with two or more chapters dedicated to just that: « How to Port & Flow Test Cylinder Heads »
Mr. Vizard If you can do a episode on Standard Triumph Engines in Regards to Camshafts and Valves Since You Wrote Your Book Back In The 70s It Would Be Greatly Appreciated.
As a machinist, I am grateful that all the 5 valve engines have come up short . They make piston work quite annoying . But I was worried when they first appeared .
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@Mr. Vizard: When you are doing the radius from to bowl towards the valve seat, are you grinding material off the valve seat itself to get the desired radius?
And if so, how do you know, or better: when there is a larger and a small radius made on the seat, will the valve have more, or less, contact on the surface of the seat on one side then the other?
Video request for David! Make a video about offset bore cylinders in place of piston swapping please!
I thought it was called gun drilled, when cams and such were drilled to hollow them!
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I read all the comments and replies hoping that someone commented on the 1996 LT1. Mine is the cast iron heads in the Impala SS. I live at the base of Pikes Peak at 6,500 feet elevation, so I wonder how that would be accounted for.
In the 1960`s and 1970`s they use to put propane on a diesel engine like nitrous. It would burn valves quick though.
Been a while since we’ve seen anything from you. I hope you’re alright and in good health!
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DV have you tested 4 pattern cams? I just read about them is that a new concept
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In reply to the question about the “bathtub” intake on a common rail he’s talking about the 03^ dodges. Been a long argument for every cummins engine about aftermarket intakes and whether they do or don’t offer gains in power
The new purpose built Cummins propane engine was developed using quartz “windows “ in the piston to record 50,000 frames per second of what is really happening in the combustion chamber.
Propane is 190 octane . Use as much compression as you can .
Some head work and headers , 600to 700.
What I understand, is 400to 500 go out of 5.3 with carb intake kit and can , nothing else
Excellent as always.
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@@jeppakongur explain
The post here above in your comment about a prize is a scam. This is not David Vizard but a scam artist posing to be him.
@@jeppakongur thanks for the heads-up. As it turns out my phone won't run telegram anyway. Have a great day. Maybe we should let him know
What equation/formula did Andy use to pick his camshaft on his hemi head engine?
127, 128, 132, 133 or something else?
i want to thank you for shareing your know how ! my name is david & i have seen your books WORK ! 1st hand what is the best overall engine book ? for building car engines
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I use a stage or halloween smoke generator if i want to see my flow with a cylinder made from plexiglass .
Hello Mr. Vizard,
In one of your recent videos you briefly talked about filleting the lower bore edges (crankshaft side) in order to optimize air flow within the crankcase volume. Will we get to see how to do this in one of your upcoming videos? I am asking because I am at the stage of my own build where I can still implement this.
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I use a cartrige roll on my die grinder to remove the sharpness fromnthat edge with a fine grit .
@Mr. Vizard: If the contact area of the valve and the valve seat is 40 degrees it is getting bigger. So area will be bigger than when the seat and valve is 45 degrees. How do you compensate?
...it seems to me the surface area by 40 degrees angle should be smaller.
Is that right?
And how do you compensate? (I already asked you this question).
Thank you.
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The difference in the valve to seat angle between a 40 deg and a 45 deg valve and seat geometry is where youre getting confused . The 40 deg has greater seen opening because of the flatter valve angle vs a valve with 45 deg seat geometry . It takes a larger 45 deg set up to equal the 40 deg at lower lifts .
Would you do a dodge ram V10?
Dv, just wondering if you ever come back to the UK in Essex, and do your courses
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What is the best way to purchase your cos-cam and your program for cams?
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David Vizard please answer this !!!
Love all the amazing informative content, but the audio level is often low or muffled.
Good morning David
I would like to be able to ask a question if it is not too much trouble, or if you could make a video talking about this topic.
I have searched for information about the dynamic compression ratio, but I can't find any relevant information.
I know it will depend on the fuel, but how much is a lot or how little is Rc, what type of fuel should be used depending on the Rc.
I dedicate myself as a hobby and the engines I make are from Bmw 16v, I know that you made 16v engines too, I would like you to talk about it one day, the relationship between valve diameter and cylinder, valve seats and ducts, it would be great information For those of us who like small multi-valve engines.
best regard
Rifle bore is for carbs we did that on dirtbike s.
This is a scam
David I have really enjoyed learning from you. I am new to building engines and wanted to start with one of your books. My main interest is small block chevy. What book of yours would be best to start with. You have so many I was intimidated.
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Hi Mr vizard, I have an 8.5 to one dodge 360 I am building. I have a 515 lift cam with an lsa of 107.5 and 226 int 234 exh @50. Is that a good cam, dynamic compression is 7.5
Try to achieve a dynamic CR of 8/1.
@@DavidVizard thanks for your reply Mr vizard, can I still run 87 octane on a 8 to 1 dynamic compression ratio?
@@jonathoncouchey7151 The gains from running higher octane are well worth the extra cost as long as you can tune the engine.
Do ya'll have any insights with a 4.0l jeep engine that's been stroked to a 4.7l? It's got 10.1to1 compression ratio and the updated, unported head forged internals and I plan on porting the stock intake and throttle body too 62mm compared to the bottle necked 56mm. If anybody has Ideas to make it more efficient I'm all ears
Where is the best place to purchase your books from? Also, thank you immensely for all of these information videos.
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Would love to port a 24V cummins head for maximum TQ & zero smoke. Will David's porting be the same for a diesel? Running compound turbos
HI Mr Vizard what can i do to my 1994 350 5.7 lt1 engine i can do myself that can give me good improvments
Hello,
I have a question regarding the diameter of the bore at the valves.
A short Information before: I refurbished my 5.9 360 of my Jeep ZJ. After taking out all the valves, specially the exhaust I measured the diameter after the valveseat. All bores had a different diameter, so I set the cylinderhead in the CNC and milled all to the same diameter. Was this a mistake? And why are there differences?
Greetings from Germany
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Hey DV, do you plan on getting the seminar website up and going again?
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What doe take to build a 500hp. street stroker , 4,000 on cheap. Well that what it cost me last year. Hell the block work was a 1,000
Hey David I have a cam lsa question I did your math calculation and it says I need 105.7 or round out to 106 I am running a 407 build 4.130 with 3.800 with a 208 valve but our target compression we are shooting for is 14:1 on a dirt over car but your calculations on it says the compression is good for 10.5:1 how can I calculate when I am running a 14:1 compression. I was just curious I just want to make sure I put the right camshaft in it.
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Over all for 2,000 not bad cheap, to get 383 street stroker power.
Any advice on porting 4v cylinder heads I want to make 100 hp per liter
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@@jeppakongur what are you some kind of wanna be expert dreamer ?? If you dont like mr vizards content LEAVE !!!
Where can I buy
The torque master cam program?
This is a scam
Mr. Vizard, I have a question about some information I read in your Holley super tuning book. When you talked about power valves, you mentioned requiring a power valve that actuated 2” below the vacuum at cruise or idle. My question is, does that mean idle in gear or idle in park? My 76 camaro with a 327 from a 66 corvette seems to require a 9.5 or 10.5 power valve but at idle in gear the power valve is obviously open because of the vacuum reading. But in park or at cruise the 9.5 or 10.5 power valve seems acceptable.
in gear.
Idle in gear
Do you have any opinions on the free valve setups, that are electronic controlled valve timing? Having the ability to program the cam timing and lift /duration, every aspect can be programmed. In theory the throttle valve can be done away with ! Using the valve lift to throttle the engine .. I believe having a throttle, and allow a programmed cam with spicy idle would be awesome! Anyway, do you have an opinion, could this be the future, ?
This system is from BMW , named valvetronic.
Koenigsegg uses it on their Gemera supercar. I think this technology is ready for mass production.
Active VOTE LIKE or
REPLY any 👍🏾✔️🏁etc
for ZOOM SEMINARS
I just recently finished a somewhat budget 565 bbc ...It made 847@6800 hp 687 @6100 ...I used the pro elite cnc 339cc runner 121cc 2.25 in 1.88 ex valves ..solid roller 284 in 292 ex @50 .749 in .748ex lift 1.7 rocker 114 cl. 11:1 cr....Looking to 9.50 or better in 3400lb 10.5 tire street strip car pump gas n/a ...then hitting it with 200 or 300 shot fogger ...Do you think it is doable with this combo or do you think there is more I can get out of it with different cam or heads ?? Thank You
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@@jeppakongur why you being a jerk to David ??
Andy looks like Mark Donahue!
This Instagram is a Nigerian scam
On the 6.0 dyno mule I think it would be cool to do testing on factory fuel injection systems, aftermarket like the holley terminator system and also on carburetors to show the differences
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@@jeppakongur when the notification popped up on my phone I didn’t read it fully and I thought dv replied I was like holy shit! And I clicked on it and it’s this dumb scam shit lol
Your website doesn't load; it doesn't work.
Yea do the smoke generator that's awesome
This is a scam
Let’s get
The Likes up gang.
This Instagram is a Nigerian scam
Does David do camshaft recommendation services? I do not mind paying for his recommendation because I know the correct cam will maximize performance vs poke n hope that can get expensive and without a dyno it's hard to know is this it or is there power left on the table?
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What is the optimum dynamic compression ratio with 93 octane pump gas using iron and or aluminum heads? Anybody?
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8 to 1 dynamic . However the calculated psi cranking compression matters in this . That can seem to vary . You can use 1 full point higher compression ratio with aluminum is how i believe how that works .
God bless you guys and may God bless us all with Trump four more years
HEY ! DAVID !......GOT ANY( FORD M-BLOCK) BUILDS ???? THE M ON FORD 400 IS THE TYPE BLOCK !.....NOT MODEFIED !.....PLEASE ! PLEASE ! PLEASE !
Isnt this basically a cleveland with taller decks and worse oil systen ??
The M-block has an inch more deck height and 3 inch mains a cerntent year of M- block can be mounted to a small block bell houseing or large block bell houseing but I cant remember the year . The m-block block is identfides easly by the large lug by the distribiter ! @@bobgyetvai9444
Love your videos and your knowledge is amazing but you have to get a better camera!😆
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I know just carb on LS 400 easy nothing else
I dont have 2 hours for this. You need to make this 20 min.
This is a scam !
I have never understood theses cam mfgs selling these crazy cams that don't realy work except to make EPA happy ?
Another topic is why haven't the car industry ever made great R&D improvements on head efficiency but rather depend on copying the perfomance industry and wait decades to change.
Scam going on here about a prize and some MacBook nonsense.