|
Author
|
Topic: Lash question
|
V8 Thumper
Gearhead Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001
|
posted 08-25-2002 11:26 PM
   
My first solid cam, so please excuse the elementary question  270S cam, Comp ProMagnum roller rockers. I set the lash at .022 (per spec) while the motor was still on the stand... now that the motor's got one hour of cam break-in (two sessions) and 80~some road miles, I pulled the valve covers to check. The lash is now .028!  I can see the valvetrain seating in some, but is this normal?
IP: Logged |
steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
|
posted 08-25-2002 11:30 PM
Yes, that's very normal!
The lash setting is "hot". You should have reset it after breaking in the cam while the engine was still at operating temp. You didn't hurt anything, just warm it up and adjust them again.  SteveW
IP: Logged |
V8 Thumper
Gearhead Posts: 4681
From: Phoenix, Arizona
Registered: Dec 2001
|
posted 08-25-2002 11:33 PM
Cool, thanks Steve
IP: Logged |
stang106
Gearhead Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
|
posted 08-25-2002 11:38 PM
Steve,
About when does the valvtrain stop breaking in? I only had about 50 miles on my 351W when I raced last weekend and ran the motor passed 7,500 RPM, but most of the time shifted about 6,000. I havn't checked the lash again but will in a couple of days when off from work. Odd that my new Comp solid cam states to adjust lash at 0.018" It is a custom grind, if it makes any difference.
Dave[This message has been edited by stang106 (edited 08-25-2002).]
IP: Logged |
steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
|
posted 08-25-2002 11:47 PM
Dave,Once the cam breaks in it should be stable umtil other parts wear. Like valves sinking into the seats or rockers wearing, etc. You should check them every 5,000 miles but you probably won't have to readjust them. It's cool cause you'll be able to id parts wearing prematurely that you wouldn't know about with "juice" lifters. SteveW
IP: Logged |
steve'66
Gearhead Posts: 9533
From: Sonoma,CA,USA
Registered: Mar 2000
|
posted 08-25-2002 11:48 PM
And,Cam break-in is 20 minutes at 2500 rpm, so it's broken in. SteveW
IP: Logged |
stang106
Gearhead Posts: 786
From: God's Country!... Port Alberni B.C. Canada
Registered: Jul 2001
|
posted 08-27-2002 01:03 AM
Just check my lash hot, lots of hard miles, and the lash ranges from 0.018 to 0.022" so I guess everythings working OK.
dave------------------
'70 ragtop Stang
351W - 13.70 @104.
IP: Logged |
Mustangsandmore Forums
