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Author Topic:   setting valves
AC156
Dirt Freak

Total posts: 295
posted September 07, 2002 04:57 PM
How do ya'll set your vavles on a hyd cam? It seems that everyone has different ways of doing it.

jammin
Dirt Administrator

Total posts: 5556
posted September 07, 2002 04:59 PM UIN: 16262997
I always set my hydraulics while the motor is running......back off until they start chattering...tighten back up until they quit and then go 1/4 turn more and you are set. Seems to have worked for me.

jammin

outlawstock17
Dirt Forum Champ
Total posts: 620
posted September 07, 2002 05:41 PM
my method is to twist the push rods while i'm tightening down the rocker. when you feel resistance, stop and lock it down. when i used to run hydraulic cams, i liked to run a .001 or .002 of lash in it. it helps the engine get off the corner better and cuts down on valve float at high rpms.

[This message has been edited by outlawstock17 (edited September 07, 2002).]

GET-n-IT 12
Dirt Roller

Total posts: 9
posted September 08, 2002 08:00 PM
I have to agree with jammin,but most important is set them all the same. Comp Cams web site has alot of info.

dilbert
Dirt Roller

Total posts: 21
posted September 09, 2002 10:24 PM
Motorheads, please critique my methodology. I take the end play out of the pushrod by tightening the rocker nut (with the subject valve fully seated) and then tighten another 1/2-5/8 turn on the nut. Have I been doing it somewhere close to right?

[This message has been edited by dilbert (edited September 09, 2002).]

outlawstock17
Dirt Forum Champ
Total posts: 620
posted September 10, 2002 06:08 AM
as you can see by the replies, different people adjust them differently. i never add the addional 1/4 turn, 1/2 turn or whatever, after i get the slack out. my reasoning behind this is.....when you preload the lifter(depress the plunger), there's the possibility that the valve will not seat fully when the oil pressure is up, especially with thicker racing oil and high pressure/high volume oil pumps.

it won't hurt to have a thou or so of lash in it. this will keep the lifters from "pumping up" and preventing the valve from getting fully seated. it will also help get the car off of the corner better giving the cam a "solid lifter effect"; by "popping" the valve open and shut instead of slowly opening and closing it. all this applies to a race engine only. if i were adjusting valves on a street engine, i'd use jammin's method, but when i'm trying to extract every advantage out of my engine to beat the next guy, that's how i do it.

i'm sure that some will disagree but that's the "method to my madness"! LOL!

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