lash caps?
Team Owner
Joined: Dec 2000
Posts: 90,675
Likes: 304
From: SE NY
Cruise-In II Veteran
For some race engine applications hardened caps are placed on the tips of the valve stems. In this case the lock must have a recess for to accept the lash cap.
Our SBCs do not use lash caps so must have a lock without this recess.
Our SBCs do not use lash caps so must have a lock without this recess.
Large Impressive Member
Joined: Jul 2003
Posts: 65,811
Likes: 71
From: Good health is merely the slowest possible rate at which one can die
St. Jude Donor '04-'05-'06-'07
Originally Posted by Hippiehead025
whats the purpose of lash caps, im lookin for valve locks and they say recess for lash caps? so what they do?
Pro
Joined: Jul 2003
Posts: 543
Likes: 0
From: DFW Texas
I'm no valvetrain expert but I do know that in some high perf. applications guys will run a small diameter valvestem and sodium filled valves in order to reduce flow restriction and weight. The smaller diameter valvestems may not provide enough surface area for the roller rocker to contact so the lash cap provides the lost surface area. I used these on a 468 BBC I had at one time, many years ago.
Race Director
Joined: Sep 2003
Posts: 16,838
Likes: 341
From: Database Error Indiana
Originally Posted by JAKE
When used on titanium valves they exend the life of the valve stem tip. They can also add length to the valve stem.
Jake
Jake
Stainless valves also tend to have soft tips. High spring pressure tends to wear them out
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Burning Brakes
Joined: Feb 2002
Posts: 804
Likes: 5
From: Fresno CA
Lash caps are typically used in race applications with extremely high valve spring pressure that with some valves can cause premature wear on the valve stems. You must have the correct retainers and locks to use them though...I wouldn't consider it with the camshafts that street engines use.
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
I used lash caps on my engine. I'm using a solid roller cam and expect to see 8000rpm regularly. They will also extent the life of stainless valves with increased spring pressures and can be used to correct valve train geometry.
Thread Starter
Melting Slicks
Joined: Jan 2004
Posts: 2,979
Likes: 0
From: walkersville md
my cam is 510/510 at 220/230 114. using 1.6 rockers ( full roller) i have No idea what springs to use yet. can sum1 givem e insight, and whether or not i should use lash caps? its goin on a SC motor tht should be around 750 hp.
Le Mans Master
Joined: Feb 2002
Posts: 5,970
Likes: 20
From: San Marcos Texas
call the cam manufacturer and ask them, they can tell you the pros and cons better than anyone. I used comp cams cam, springs, locks, tiatinum retainers, pro magnum roller rockers, stud girdle and their lash caps. The lash caps are picked by the diameter of the valve stem.
Last edited by chriswtx; Sep 8, 2004 at 11:28 PM.
