Checking with hydralic lifters
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Checking with hydralic lifters

  1. #1
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    Default Checking with hydralic lifters

    All the engines I have built have been with solids. I'm doing a 348 thats going to be a cruiser, but I would still like to check valve timing, push rod length and valve to piston clearance. Any way to do this? It's a flat tappet cam. Thanks

    Tim

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    Senior Member Hass828's Avatar
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    Quote Originally Posted by River Rat 005 View Post
    All the engines I have built have been with solids. I'm doing a 348 thats going to be a cruiser, but I would still like to check valve timing, push rod length and valve to piston clearance. Any way to do this? It's a flat tappet cam. Thanks

    Tim
    swap out a couple lifters for solids, just to check/measure, then put the hydraulics back in.
    "if we keep doing it the same way we always do..we will always get the same results"
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    Senior Member carreradude's Avatar
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    Using solids will work for checking piston to valve clearance, but use the lifters you will be running to check pushrod length and cam timing with light checking valve springs. There will most likely be height difference where the pushrod sits between the solid and hydraulic lifter and will throw off pushrod length readings.

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    steelcomp was here
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    You can check for proper rocker geometry and push rod length real easy without even rolling the motor over.

    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Thanks guys for tthe come backs. And a big thanks to Scott for the video. Never thought of checking that way. I'll try it on this motor.


    Tim

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    Default Fantastic Instruction

    Quote Originally Posted by scott foxwell View Post
    You can check for proper rocker geometry and push rod length real easy without even rolling the motor over.

    Scott, I just finished watching your video on rocker arm geometry and push rod length. I was a HS/CC shop teacher for many years and want to
    compliment you on your presentation. Fantastic job! Great technical information presented in "easy to understand" language.

    Dave

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    Senior Member jetjunky's Avatar
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    Nice, you made it look so easy even a cave man could do it. Thanks for putting that up.

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    Quote Originally Posted by jetjunky View Post
    Nice, you made it look so easy even a cave man could do it. Thanks for putting that up.

    Or Ozarks Hillbilly. Thanks for the video.

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    Saved the video to my favorites. Thanks.

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    steelcomp was here
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    Thanks for the nice compliments guys. Glad you're finding the video helpful.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Senior Member Hass828's Avatar
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    Scott, since the rocker has a ratio of 1.7-1, and the lift is actually measured @ the valve, is lowering the rocker by exactly half of the lift @ the trunion actually perfect? or is it just close enough?
    "if we keep doing it the same way we always do..we will always get the same results"
    H8-2-W8
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  14. #12
    steelcomp was here
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    Quote Originally Posted by Hass828 View Post
    Scott, since the rocker has a ratio of 1.7-1, and the lift is actually measured @ the valve, is lowering the rocker by exactly half of the lift @ the trunion actually perfect? or is it just close enough?
    If the rocker starts at 90* to the valve,
    and you lower the trunnion .500",
    then you lower the roller (open the valve) .500",
    where is the rocker now?
    Ratio doesn't play into it.
    If God is your co-pilot, change seats!
    Acts 2:38, the perfect answer to the perfect question.

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    Super Moderator HammerDown's Avatar
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    Thumbs up

    Scott is the man, and one heck of a nice fella to chat with
    <img src=http://www.performanceboats.com/gallery/data/500/medium/06-30-11_1234.jpg border=0 alt= />

  16. #14
    Senior Member howler439's Avatar
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    Great vid Scott , wish they had youtube 35 yrs ago .................LOL Heck the local college just got brand new seat cutters (cutting edge tech for back then) and centerless was unheard of haha. Cheers Jim

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