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Thread: Valve adjustment Help

  1. #1

    Valve adjustment Help

    Does anybody know the sequence for adjusting valves.Im used to doing each cylinder at a time.Years ago a guy told me an easier way by bringing number 1 tdc on the compression stroke doing 8 valves spin the motor 360 and doing 8 more.Does anybody know that sequence. This is suppose to help keep the lube on the lobes of the cam when putting together a new engine by only spinning the motor 1 time.Any help would be great..

  2. #2
    Junior Member APPRENTICE
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    valve adjments

    most manuals, like chiltons, has the sequence posted. BUT its for solids. and it wont work for large aftermarket race cams. best is to do each at tdc. or better is the adj intake when exht starts to open, do exht when intake starts to close. I checked on my hemi there is about .002 diff between them. its what works for me. I assume this is on older style v8s. newer hyd cam engines are way diff.

  3. #3
    Senior Member MASTER BUILDER
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    With the engine in the #1 firing position, following valves can be adjusted
    exhaust 1,3,4,8
    intake 1,2,5,7

    turn engine over 360 degrees adjust following valves

    exhaust 2,5,6,7
    intake 3,4,6,8

  4. #4
    Senior Member RACING JUNKIE
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    Hey Fishman,does that work with a cam with alot of duration,too??Always curious about that :?: :?:
    "The problem with quotes on the Internet is that you cannot confirm their validity"- Abraham Lincoln

  5. #5
    Senior Member MASTER BUILDER
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    Quote Originally Posted by olds48
    Hey Fishman,does that work with a cam with alot of duration,too??Always curious about that :?: :?:
    I am going to try it at the dyno on friday and see the diffrence

  6. #6
    Senior Member RACING JUNKIE
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    Quote Originally Posted by fishman1
    With the engine in the #1 firing position, following valves can be adjusted
    exhaust 1,3,4,8
    intake 1,2,5,7

    turn engine over 360 degrees adjust following valves

    exhaust 2,5,6,7
    intake 3,4,6,8
    Wouldn't that depend on the firing order? How can that work on every engine if the firing orders aren't the same?

    Unless "1 2 3 4 " doesn't neccesarily mean cylinder number "1 2 3 4 " but rather the cylinder that fires 1st Then the cylinder that fires 2nd etc

    What am I not understanding?

  7. #7
    Senior Member RACING JUNKIE
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    Looks to me like no matter what, you have to turn the crankshaft 720*, so whats the advantage? If you still have turn the motor over twice what difference would make, as long as you adjust the valve on the base circle of the cam?
    suicidebomb
    No matter where you go, there you are.
    **IN GOD WE TRUST**

  8. #8
    Senior Member RACING JUNKIE
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    Quote Originally Posted by suicidebomb
    Looks to me like no matter what, you have to turn the crankshaft 720*, so whats the advantage? If you still have turn the motor over twice what difference would make, as long as you adjust the valve on the base circle of the cam?
    suicidebomb
    How you figure ya need to turn it over 2 times? Do 8..then turn it over and do the other 8.

  9. #9
    Senior Member RACING JUNKIE
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    You're right, Too little thought, too much mouth. But... I still see little to no advantage to it,over adjusting each cylinder individually. You still have to adjust 16 valves, and its the adjusting that takes the time, not the turning over the motor. jmho Also unless the motor was shut off at top dead center compression stroke #1 or 6 cylinder you are going to have turn the motor to that before beginning anyway. I just don't get it, but I'm old and stuborn! ops: And, if you're doing it to keep assembly lube on the cam lobes, wont most of it be wiped off by the time you get the valves adjusted anyway?

  10. #10
    Senior Member MASTER BUILDER
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    Here's the only way valves in a race motor should be adjusted:

    When the exhaust valve is almost all the way open then adjust the intake on that cyd......

    When the intake has fully opened and is about 1/2 way closed then adjust the exhaust on that cyd..

    This is the way I have been doing it for years and never had a problem..

    Good luck.. 8)


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