valve settings

Go down

valve settings

Post  Larry Williams on November 12th 2015, 12:01 pm

I have read on here about reducing the valve settings when using aluminum heads.  I have P51' heads and a comp solid roller that calls for .018/.019 settings.  What should I set them for on a cold engine?  Its a never fired 545
avatar
Larry Williams

Posts : 884
Join date : 2009-08-08
Age : 73
Location : Wallacetown Ontario

View user profile

Back to top Go down

Re: valve settings

Post  gmsmkr on November 12th 2015, 12:07 pm

If it's a hot lash I would set them cold .015/.016 then check them hot and see where it is
avatar
gmsmkr

Posts : 1364
Join date : 2014-06-22
Location : alabama

View user profile

Back to top Go down

Re: valve settings

Post  kim on November 12th 2015, 1:39 pm

Aluminum heads, if the hot lash is .016" and that's where you want it, cold lash is going to be about .026" every head is different, but your going to get somewhere between .008" to .015" growth with the aluminum heads being hot.

kim

Posts : 700
Join date : 2009-06-27
Location : Tucson AZ

View user profile

Back to top Go down

Re: valve settings

Post  gmsmkr on November 12th 2015, 2:13 pm

Iron block with aluminum heads you subtract from hot lash DO NOT ADD lash for a cold setting
avatar
gmsmkr

Posts : 1364
Join date : 2014-06-22
Location : alabama

View user profile

Back to top Go down

Re: valve settings

Post  kim on November 12th 2015, 3:24 pm

Set them cold, to your hot lash setting.  Start engine and build heat.  Set 1 side, button up. Reheat, set other side.  Check cold lash value after your proper hot lash setting.

kim

Posts : 700
Join date : 2009-06-27
Location : Tucson AZ

View user profile

Back to top Go down

Re: valve settings

Post  kim on November 12th 2015, 3:30 pm

Set them cold, to your hot lash setting.  Start engine and build heat.  Set 1 side, button up. Reheat, set other side.  Check cold lash value after your proper hot lash setting.  That tells you how much your heads grow when hot, and what  the minimum lash adjustment you can go to.
 And yes, ss pointed out above, my first information was head up ass moment.  Too tight hot, can hsve valve off seat cold.  Cold lash is that .008 to .010 less than hot.

kim

Posts : 700
Join date : 2009-06-27
Location : Tucson AZ

View user profile

Back to top Go down

Re: valve settings

Post  rmcomprandy on November 12th 2015, 7:13 pm

Larry Williams wrote:I have read on here about reducing the valve settings when using aluminum heads.  I have P51' heads and a comp solid roller that calls for .018/.019 settings.  What should I set them for on a cold engine?  Its a never fired 545

I would set them about .004" tighter when cold with aluminum heads.

rmcomprandy

Posts : 5142
Join date : 2008-12-02
Location : Roseville, Michigan

View user profile http://www.rmcompetition.com

Back to top Go down

Re: valve settings

Post  Wheelie58 on November 12th 2015, 7:26 pm

rmcomprandy wrote:
Larry Williams wrote:I have read on here about reducing the valve settings when using aluminum heads.  I have P51' heads and a comp solid roller that calls for .018/.019 settings.  What should I set them for on a cold engine?  Its a never fired 545

I would set them about .004" tighter when cold with aluminum heads.
Randy is my hero.
.004" tighter is usually pretty close.
Keith
avatar
Wheelie58

Posts : 1840
Join date : 2009-08-08
Location : Alpharetta, GA

View user profile http://www.keithfulpmotorsports.com

Back to top Go down

Re: valve settings

Post  Larry Williams on November 13th 2015, 12:22 am

just the answers I needed thank you all who replied .004 it is
avatar
Larry Williams

Posts : 884
Join date : 2009-08-08
Age : 73
Location : Wallacetown Ontario

View user profile

Back to top Go down

Back to top


 
Permissions in this forum:
You cannot reply to topics in this forum