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Author Topic:   Setting valve lash
Gary
Gearhead

Posts: 726
From: Sarasota, Fla. USA
Registered: Jun 99

posted 12-02-2001 08:28 AM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
It's a tight fit with the 460 block in my 69. I want to set the valve lash on my flat tappet solid cam but set it with a cold setting. I know the best way is with the rocker cover off with engine running but don't have those clip-on oil deflectors to keep the oil from running all over the place. I wanted to pull the plugs with engine cold, rotate by hand and set the lash. My question is how much to compensate (extra clearence)with engine cold so the lash is correct when engine is hot. My cam card only gives hot settings. 2-3 thousands??
Thanks

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Mpcoluv
Gearhead

Posts: 1278
From: Charlotte NC usa
Registered: Apr 2001

posted 12-02-2001 10:28 AM     Click Here to See the Profile for Mpcoluv   Click Here to Email Mpcoluv     Edit/Delete Message   Reply w/Quote
You can always set them .003 tighter cold, then warm up the engine to its "hot" temp. then shut off the engine and measure the lash with it hot. If it is off, re-adjust with the engine hot, but not running.

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Gary
Gearhead

Posts: 726
From: Sarasota, Fla. USA
Registered: Jun 99

posted 12-02-2001 10:51 AM     Click Here to See the Profile for Gary   Click Here to Email Gary     Edit/Delete Message   Reply w/Quote
That sounds backwards to me, I would want them looser cold allowing for expansion when hot. When the engine is hot there is no way to remove the plugs so I can rotate the engine by hand. It is such a tight fit between the tower and the head and not interested in burning myself. I just wanted to know where to set the lash cold if the hot setting is 23 thousands. My thoughts were @ 25 thousands with the possibilty of 26

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Rustang
Gearhead

Posts: 733
From: Clarion PA
Registered: Nov 2000

posted 12-02-2001 11:02 AM     Click Here to See the Profile for Rustang   Click Here to Email Rustang     Edit/Delete Message   Reply w/Quote
There always seems to be debate about setting tighter or looser cold. I've even had cam mfg's say it's unpredictable and can vary depending on aluminum heads vs cast, etc.. I've always set them a few thousandths loose cold. That way if there are any valve-to-piston clearance problems at least you have a little buffer in there in case things DO tighten up. Then as soon as the car warms up, reset them hot. Then you're good to go.

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SteveLaRiviere
Administrator

Posts: 43151
From: Saco, Maine
Registered: May 99

posted 12-02-2001 05:08 PM     Click Here to See the Profile for SteveLaRiviere   Click Here to Email SteveLaRiviere     Edit/Delete Message   Reply w/Quote
I would set it .002" loose, then run it and check it hot. Bump the engine over with the solenoid or key to check.

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clevelandstyle
Gearhead

Posts: 1035
From: Connersville, IN
Registered: Jul 2001

posted 12-02-2001 06:52 PM     Click Here to See the Profile for clevelandstyle     Edit/Delete Message   Reply w/Quote
Here is a page that explanes this very subject.

http://www.cranecams.com/mliftfaq.htm

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