WHAT IS PISTON TO VALVE CLEARANCE? THE ULTIMATE GUIDE TO SEEING AND UNDERSTANDING PISTON TO VALVE!

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  • Опубликовано: 27 авг 2024

Комментарии • 219

  • @thegalli
    @thegalli Год назад +57

    We like it when the P is close to the V

    • @I_like_turtles_67
      @I_like_turtles_67 Год назад +10

      Well, this P to V is cheaper than eighteen years of child support.

    • @rickybobby0314
      @rickybobby0314 Год назад +2

      😂

    • @erickbernard8208
      @erickbernard8208 Год назад +4

      I love when my P is destroying the V😂

    • @whataboutbob7967
      @whataboutbob7967 Год назад

      Suck squeeze bang blow!

    • @milojanis4901
      @milojanis4901 Год назад +1

      Good info, Richard. I've always heard that a tighter LSA will reduce P to V clearance. Say, a 110° LSA will have less clearance than a 114° LSA. After watching your video, I can see that would be correct.

  • @martyshumard6254
    @martyshumard6254 Год назад +14

    Now you need to show us how cam duration and lobe separation effect P to V clearance.

  • @GroovesAndLands
    @GroovesAndLands Год назад +23

    Fantastic video and idea, Richard. Next up you should demonstrate techniques for actually testing PtV clearance. Perhaps do the "clay" technique and rolling the engine all the way over, and then also the dial indicator approach only in the danger zone. Then you can discuss the pros/cons to each approach.

    • @richardholdener1727
      @richardholdener1727  Год назад +17

      I want to show where the valve hits on the piston and why LS dish pistons might not improve p-v

    • @richardprice5978
      @richardprice5978 Год назад

      @@richardholdener1727 would really be helpful to show how to test VVT and or lobe separation angles/LSA with a bigger/aftermarket parts and how limiting the phaser, change's-different's and for others the importance of it plus showing valve floating and deflection's-all-parts and why's it's okay and in some cases it's extremely a bad idea/thing to have. having a pushrod that's collapsible/expandable aka something like a hydraulic cylinder ( and or figuring a way of pressurising the lifter's in the cut-away, basically how my engine now works with a jerk-pumps and pipes/liquid-rods and slave-cylinder's and software/ECU instead of fixed steel-rod's+rocker's ) and a hand/porta-power ram-pump can showcase differences 😉 👍 , also a different but related idea is having a extra sloppy/stretchy piston or piston-pin can show were/high-mileage's/lacklustre-maintenance and also higher loading/RPM and how it can change P/V clearances and timing ect
      something i kinda/think 🤔i know how just not 100% testing processes/setup/efi-ect-tunes yet on my modified 1960's-540~ci hemi 4.3X4.5" stroke as i add a 60*lsx twin phasers ( yes i need the limiting blocks/software-lock's but not fully sure on maximum setting's yet 💯 ) to change VVT&LSA timing's ect plus VVL/multi-air system and variable valve-spring-rate like a f1/race-engine car ect

  • @carltaylor4503
    @carltaylor4503 Год назад +8

    Love this video! I would be very curious to see how increasing the rocker arm ratio effects clearance.

  • @andrewcammer2535
    @andrewcammer2535 Год назад +10

    Very cool cutaway. This is one of those things that's so hard to explain to people, and a great visual goes a longs ways. It would be neat to talk a bit about acceptable piston to valve clearance in different configurations, what impact cylinder head milling and gasket thickness changes have, and maybe demonstrate how some flycuts or aftermarket piston with reliefs can add meaningful clearance. It would also be interesting to explain some common failures that result in unwanted PTV contact (valve float, lifter pump-up, broken spring, loss of cam to crank sync via some loose cam bolts, etc) and what can be done to mitigate those scenarios. Great visualization, should be a lot of ways to use this to demonstrate all kinds of things.

  • @mikedimaio1237
    @mikedimaio1237 Год назад +4

    Use the cut off pieces to cast a clear acrylic part, slap that on the engine and run smoke through the chamber to see how the air flows. Love the cutaway engines, Chrysler had them as a motorized display.

  • @royosborn7869
    @royosborn7869 Год назад +4

    Great demo, Richard - looking forward to your next educational session on piston to valve clearance - lots of good suggestions posted.

  • @richwhaley6558
    @richwhaley6558 Год назад +5

    Great demonstration Richard! Instead of trying to visualize it in my head I can actually see what is really happening. And yes I'd love to see the changes when advancing and retarding the cam when it comes to piston to valve clearance! Keep up the great work Richard!❤

  • @firebry23
    @firebry23 Год назад +3

    Yes to all of the questions at the end.

  • @BigMikesGarage
    @BigMikesGarage Год назад +4

    Nice display and explanation. Just FYI: Dipping your carbide burr in ATF occasionally will make the cutting go quicker and keep the aluminum from sticking to the burr.

  • @marksearcy9708
    @marksearcy9708 Год назад +3

    Great visual aid, Use high compression domed piston with different over lap and valve float would be a good one. Awesome dude!😁

  • @scrappy7571
    @scrappy7571 Год назад +1

    When I was a punk kid in the 70's, the local lawn mower shop had a cut-a-way briggs flat head engine on the parts counter. I would stare at it in amazement! I learned so much fixing minibikes and lawn mowers, the basics still apply to modern cars.

  • @bluecollarhotrods9781
    @bluecollarhotrods9781 Год назад +4

    Great visual, I've seen animation and drawings - but this was way better. I asked a question on the live feed a few nights ago. You said LSA affects this. I'd love to see a bunch of 230 & 230+ intake duration cams at various LSAs and how tight they are, or if they even work at all. And maybe a method of getting in the ballpark of what will fit when selecting a camshaft.

  • @scotthultin7769
    @scotthultin7769 Год назад +3

    16👍's up thank you for sharing 😊

  • @sarsavage
    @sarsavage Год назад +2

    You did a awesome job explaining pistons to valves clearance, i really appreciate all your videos

  • @kidsteach938
    @kidsteach938 Год назад +4

    This is amazing, Richard! Thanks so much for showing us this. What a great concept to open up the engine and let us see the whole process.

  • @michaellombard894
    @michaellombard894 9 месяцев назад +1

    Great graphic Richard. Thanks for the visual demo.

  • @cam3002
    @cam3002 Год назад +2

    Fantastic, if I could subscribe again, I would! Suggest future tests to include 1) how does changes in LSA affect PV? 2) how does rod length affect PV? Thanks for sharing your insights with the community.

  • @3800TURBO
    @3800TURBO Год назад +2

    Maybe find a cam with super fast ramp rate and big overlap. Something that needs valve relief in the pistons. Be cool to see then when it actually hits and where that corresponds on a degree wheel and dial indicator setup on ya demo.. Cool demo. 👍

  • @Gearbhall
    @Gearbhall Год назад +2

    This sectioned display motor is really cool

  • @KillerRage360
    @KillerRage360 Год назад +3

    Possibly demonstrate the maximum possible duration for a 4.8/5.3 or 6.0L Flat top pistons, Dished pistons. Would be awesome to see. I've learned alot from your channel 🏁

  • @ryancoakley2796
    @ryancoakley2796 3 месяца назад +1

    I love it when valves chase the pistons and the pistons chase the valves gets me excited😅😮😂😅😅😅!!!!!!

  • @ummduhgmail
    @ummduhgmail 11 месяцев назад +1

    Shows quench and other stuff well also. It was neat to see, i knew the idea, but cool to actually see.

  • @jplperformance9073
    @jplperformance9073 Год назад +2

    Amazing video, thanks

  • @blownfox
    @blownfox Год назад +1

    That was a alsome video very cool to be able to see inside the combustion chamber.That deffenly explains a lot so many be you can show what advancing really does come into play

  • @negobaj
    @negobaj Год назад +1

    Fun Demo! Excellent!

  • @carportshenanigans5918
    @carportshenanigans5918 3 месяца назад +1

    Great demonstration! That engine is gonna have some serious blow-by issues though. 🤣. Seriously though, thanks for hacking up some parts to make this video!

  • @coboscustoms4342
    @coboscustoms4342 Год назад +1

    Very very well explained!!!

  • @reachadcreadordasilva3471
    @reachadcreadordasilva3471 5 месяцев назад +2

    Funny you asked how it looks in the cylinder when you advance and restart the cam. I was actually searching it so the I can learn to make 1.7 work safely on my sbf with n41 cam

  • @TheRaulr151
    @TheRaulr151 8 месяцев назад +1

    Perfect video for explaining the need to P2V clearance!

  • @bfromthed
    @bfromthed Год назад +1

    Great walk through for people that may not understand.

  • @takeit2-11
    @takeit2-11 Год назад +1

    I always learn new things when I watch your vids, thank you! I would like to see turbo magnum! turbo magnum! turbo magnum!

  • @ozysniper
    @ozysniper Год назад +1

    Holy crap! You go all the way.... GREAT WORK! You are the man.👌

  • @harryguy76
    @harryguy76 Год назад +1

    Great tool to explain different cam specs and what they actually mean...

  • @chevyguy9827
    @chevyguy9827 6 месяцев назад +1

    Great demonstration I’d like to see how a dome piston reacts with a big duration cam

    • @richardholdener1727
      @richardholdener1727  6 месяцев назад

      dome pistons usually have valve reliefs, so p-v is increased

  • @vanhap
    @vanhap 8 месяцев назад +1

    Adjustable cam sprocket measured at 1 deg intervals whilst measuring PtoV clearance accordingly

  • @BowTieSS70
    @BowTieSS70 Год назад +2

    Great video! I'd like to understand the limits of the clearance and not specifically a number but methodology to the number. Why is it anything greater than zero clearance? What factors contribute to it being greater than zero? Does RPM play a factor? Can valve float cause an issue?

  • @corydunlap777
    @corydunlap777 Год назад +1

    Wow, I need to check ptv on this next motor and now I’m going to cut up a torched head and make a couple of these too! Great idea

  • @rimka11
    @rimka11 Год назад +1

    Yes that would be nice to see, at what degree of retartd and exhaust valve will contact a piston, and on what advance an intake.

  • @VictorSanchez-kp9nt
    @VictorSanchez-kp9nt Год назад +1

    Super cool to see it like this. Great video and I'll share this one with friends.

  • @austincjett
    @austincjett Год назад +1

    Thank you for the video.

  • @user-lb6ts8xm5r
    @user-lb6ts8xm5r Год назад +1

    thank you for this valuable l information

  • @LilRay.18
    @LilRay.18 Год назад +1

    Now that you mentioned it, It would be pretty cool too see what it looks like to advance a cam! Maybe a video about that wouldn’t be a bad idea 👀

  • @markbowen6493
    @markbowen6493 Год назад +1

    Excellent video. Can you discuss float, which I presume only matters on the exhaust valve.

  • @Lobo-tommy10
    @Lobo-tommy10 Год назад +1

    Super interesting!

  • @carllattimore8227
    @carllattimore8227 Год назад +1

    This is how to teach! Great video!

  • @joshstovall5783
    @joshstovall5783 Год назад +1

    Absolutely the most lift the rocker geometry will allow like 1” lift and play with LSA and timing events to make it work without piston modifications. Basically the most ridiculous cam ever that will probably not idle and definitely not make power. But it would be a nail in the coffin about the “how much lift can I run” question!

  • @slightly.above.average
    @slightly.above.average Год назад +2

    I would like to see PTV based upon head milling. So if you over mill the head you can then simulate different head millings with gasket thicknesses.
    Bias cause I had my head milled .020 and would like to see the change to PTV it caused.

    • @JackstandKing
      @JackstandKing Год назад +1

      Same I milled my heads to 58cc and have a 232/242 .600 / .600 113+3 cam. Clay method showed plenty of clearance but would be cool to see in action.

    • @richardholdener1727
      @richardholdener1727  Год назад +1

      I can remove the gasket

  • @randywilliams4325
    @randywilliams4325 Год назад +1

    Great video . A suggestion - putting in a cam that won’t work and the valves hit - too much duration .

  • @lancr735
    @lancr735 Год назад +1

    GREAT VIDEO!!
    Install a cam designed for supercharger use with 0 to negative overlap verses a NA cam with lots of overlap which gives that old school lopy muscle car sound. And explain why no to negative over lap (explain negative over lap too) is best in a blower application verses a NA cam with lots of over lap. And how wide overlap can get dangerous with piston to valve clearance. And add to this how a improperly timed cam can cause piston to valve strikes. And why degreeing a cam is very important bro know it’s timed correctly before starting up.

    • @richardholdener1727
      @richardholdener1727  Год назад

      the cam that makes more na power will make more boosted power-stop with all this overlap talk

  • @GrandPitoVic
    @GrandPitoVic Год назад +1

    Brother, that was awsome

  • @danlindeke2561
    @danlindeke2561 Год назад +1

    On of cam company had "soft springs" you could compress by hand as you rotated engine.

  • @keything8487
    @keything8487 Год назад +2

    different type pistons test be cool

  • @bobqzzi
    @bobqzzi Год назад +2

    It would be good to share your experiences with how much is enough PV with various lifter types and RPM ranges

  • @Fatt-billy.racing
    @Fatt-billy.racing Год назад +1

    In my gen Iv 6.0 im running a mast motorsports 625in -648ex 248in 260ex @.50 and had to cut the pistons .040 on intake to get .080 with .051 gasket

  • @gearheadsteven
    @gearheadsteven Год назад +2

    thanks that was great! what changes does a higher lift rocker make at TDC? 1.7, 1.8.

  • @aukseharris4630
    @aukseharris4630 Год назад +1

    That would make a really great teaching tool. I have a block, I just need a busted head.

  • @whataboutbob7967
    @whataboutbob7967 Год назад +1

    This also illustrates valve-cylinder wall shrouding.

  • @jackwillson8099
    @jackwillson8099 10 месяцев назад +1

    Piston chases the exhaust valve so always use .110 min on exhaust side, youll be safe intake 0.080 min with 0.031 radius in piston pockets ! Save for lots of street strip motors

  • @russelljackson7034
    @russelljackson7034 Год назад +1

    Right on

  • @neilhansen9886
    @neilhansen9886 Год назад +1

    Very well done👍

  • @scotttimpany2845
    @scotttimpany2845 Год назад +3

    Richard! You'll go thru a boatload of engines trying to measure piston to valve clearance that way! Let's talk before you cut up anything else.

  • @keithsmith9889
    @keithsmith9889 Год назад +1

    See I appreciate that you want to explain and demonstrate it. But on the other hand I want to cry cause that poor head... 😢

  • @howididitgarage.
    @howididitgarage. Год назад +2

    Stock cam vs big cam. What is the difference and why it make more power.

  • @aslacker
    @aslacker Год назад +1

    Love it, lets test !

  • @davidanderson6706
    @davidanderson6706 Год назад +1

    This is some good stuff

  • @shane-222
    @shane-222 Год назад +1

    Great job! That cam is a good duration and fairly typical LCA. Maybe you could go through an example where you measure the clearance with a dial indicator and then advance and retard the cam to show how PV changed.

  • @GETLITUP69
    @GETLITUP69 Год назад +2

    Should test 3 cams with high duration..226, 230, 235 cam...on intake.

  • @rogerstill719
    @rogerstill719 Год назад +1

    Hello I would like to see a narrow LSA, a 107° . A narrow LSA will raise cylinder pressure which will change dynamic compression

  • @laiky71
    @laiky71 Год назад +1

    LSA and overlap, intake centerline etc

  • @WildEngineering
    @WildEngineering Год назад +2

    Can you please compare PTV on different LSAs on otherwise similar cams.

  • @jeremiaswitt1374
    @jeremiaswitt1374 Год назад +1

    Hey Richard what about engine quench test’s, also check truck Norris cam because of the bigger overlap it has

  • @larryhornsbyjr6731
    @larryhornsbyjr6731 Год назад +1

    I’d love to see this test on a MS3

  • @liltyler209
    @liltyler209 Год назад +1

    I'd like to see the Brian tooley racing f35 cam p2v clearance tested

  • @bilibonka
    @bilibonka Год назад +1

    Would be nice to see diffrent LSA with similar duration.

  • @doolallyproductions7234
    @doolallyproductions7234 Год назад +1

    My school had a pink cadillac motor cut out like that

  • @Kstang09
    @Kstang09 Год назад +1

    Now the question is, will my 241 heads milled 40-thou work with a BTR stage 3 na Ls1 cam without cutting valve reliefs 🤔 haha.
    Thanks as always, Richard!

  • @scotthultin7769
    @scotthultin7769 Год назад +2

    What's the minimum valve piston clearance you can run
    I ran it as tight.037 find the intake and I wasn't even concerned with the exhaust was doing

  • @chriswise1232
    @chriswise1232 Год назад +1

    Seeing that band saw makes me want to throw mine away. Damn son.

  • @benkrom2737
    @benkrom2737 Год назад +3

    With hydraulic lifters That title is theoretical 🧐

  • @bicylindrico
    @bicylindrico Год назад +2

    It would be great to know how much deviation there is in a static clearance measurement compared to an actual dynamic amount when factoring in deflection of parts under load with a full valvetrain. I would guess this must equate to quite a bit but no clue how this could be measured

  • @michaellecount8510
    @michaellecount8510 Год назад +1

    Great video! I bet that head you cut was a 317 lol

  • @TomSmith-cv8hk
    @TomSmith-cv8hk Год назад +1

    You can put a zero overlap cam in and show how much real overlap there actually is. The Red Hot would have only had 6 odd degrees of overlap at 50 thou tappet lift but there was plenty of valve opening for both valves at TDC.

  • @hallibraj
    @hallibraj Год назад +1

    Cool video! Id like to see how to check p2v on a motor with a VVT limiter.

    • @richardholdener1727
      @richardholdener1727  Год назад

      test ptv at the extremes of the VVT (full advance and full retard), many ECU systems don't use all that is available

  • @pbettselectric134
    @pbettselectric134 Год назад +1

    850 dp Holley Summit dual plane air gap intake. Hydro-Roller

  • @hardman556
    @hardman556 5 месяцев назад +1

    Awesome video, now how do I measure this on my engine with my setup? Clay? With or without head gasket?

  • @giantpune
    @giantpune Год назад +1

    Put the display motor on the dyno and see how much HP it makes!

  • @dresdensvo
    @dresdensvo Год назад +1

    I would like to see valve to wall clearance . include cathedral port and rec port . how bad is it ?

  • @DudeManRife
    @DudeManRife Год назад +2

    I’m curious in understanding how lsa/icl affects how you install a camshaft. Greater lsa = more pv clearance, but usually pushes peak hp/torque higher in the rev range. Should (or can) you advance that camshaft to lower peak hp/torque, or should you retard the camshaft to take advantage of the high range of the camshaft? Or is it specific to the rest of the build? How about all of this with a tighter lsa/icl?
    Do you need to take into account a certain amount of wrist pin slop at the top of the stroke when installing the cam? How do you know when the pv is too tight?

  • @kennethkieffaber7360
    @kennethkieffaber7360 Год назад +1

    A good video on how to know what cam will fit without pulling the heads. Is there an equation or something to use with your current p2v clearance to find out if another cam will fit before installing it?

    • @richardholdener1727
      @richardholdener1727  Год назад

      if you already know existing cam (and specs and how it was installed) -then you can calculate

  • @richardedwards8648
    @richardedwards8648 Год назад +2

    What is considered "safe" piston ti valve clearance?

    • @giantpune
      @giantpune Год назад

      In machining, clearance is clearance. As long as your parts dont hit each other while everything cold or when everything's warm, thats it. A gap is a gap.

  • @Tommy-B.
    @Tommy-B. Год назад +1

    If everyone was asking how much lift they can run, but lift isn’t a factor, why not get into how much duration can be run?

  • @GregoryBirulkin
    @GregoryBirulkin Год назад +1

    The difference in LSA angle.

  • @brandonsmith7265
    @brandonsmith7265 Год назад +1

    I wanna see what the biggest cam I can use on a 5.3 with 4.8 pistons and 706 heads

  • @T-bird_Johnny
    @T-bird_Johnny Год назад +1

    Really cool 😎 to see piston to valve visually with the super-Richie-cut-away-block 😂😂lol My only knock is that it wasn't a SBF with your favorite xe274hr camshaft, I would love to see that test since all the keyboard warriors on the forums claim it won't clear. I know it gets tight with bigger valves, but I would love to learn: how big a valve is too big? What does a guy look for in a set of heads if he wants to run the xe274hr on a stock bottom end?

  • @randallmason9687
    @randallmason9687 Год назад +1

    This is a great video! How much more clearance can You get with the piston notchers that look like a valve? On a junkyard 5.3.

  • @watsisbuttndo829
    @watsisbuttndo829 Год назад +1

    Closed captions was dissing Rich pretty hard, refers to him as "amateur holder".

  • @judedooley6971
    @judedooley6971 6 месяцев назад +1

    an you measure domed pistons with a big cam shaft how to determine the timing on the cam shaft and what not

    • @richardholdener1727
      @richardholdener1727  6 месяцев назад

      a big dome piston usually improves p-v since it comes with a valve relief

  • @GregoryBirulkin
    @GregoryBirulkin Год назад +1

    We also need to know about pizza to mouth clearance.😅

  • @pmd7771969
    @pmd7771969 Год назад +1

    Any good engine builder always plays it safe and brings the piston to TDC and opens the valve to max lift then goes from there.