SBC lash cap question - Yellow Bullet Forums

Go Back   Yellow Bullet Forums > Technical Section > Naturally Aspirated - Uratchko Racing Engines

Naturally Aspirated - Uratchko Racing Engines

Reply
 
Thread Tools Display Modes
Old 03-22-2011, 09:39 PM   #1
NASTYCAMARO
Get you some
Smoked another BBC
 
NASTYCAMARO's Avatar
 
Join Date: Jul 2008
Location: SOUTH FLORIDA
Posts: 3,717
Default SBC lash cap question

Helping a guy put his engine together and we need to use lash caps due to rocker arm to retainer clearance. what is the deal with these things in jegs they sell them for the valve stem dia. but then 2 different measurments for min tip. Is this the measurment from the tip to recessed lock base? What if you dont have enough can they be purchased for less than .250" tip
__________________
NASTYCAMARO is offline   Reply With Quote
Sponsored Links
Advertisement
 
Old 03-22-2011, 10:33 PM   #2
06meanstreak
Junior Member
Launchin
 
Join Date: Mar 2010
Location: Hiram, GA
Posts: 285
Default Re: SBC lash cap question

Tip measurement is the distance from the tip of the stem to the lock groove. .250" seems to be a standard, but you can order some longer. Take this into consideration when ordering valves as 2 different tip length valves that have the same overall length will have 2 different spring installed heights using the same locks/retainers. You are probably having retainer to rocker arm clearance issues because of retainers or locks that are made to give a taller installed height which brings the retainer closer to the top of the stem, or your pushrod length is too short. The lash caps may be your only option if you don't need a longer pushrod or don't want to get longer valves. Is the installed height correct or are there enough shims that you can remove them and use standard length retainers/locks?
06meanstreak is offline   Reply With Quote
Old 03-22-2011, 10:41 PM   #3
ordinary builder
Senior Member
Smoked Another SBC
 
Join Date: Dec 2009
Posts: 11,549
Default Re: SBC lash cap question

a longer valve with a conventional tip to groove length of .250" is the right way to fix this issue...

other option is to use a split lock that has a undercut / counterbored face so that the lash cap will sit inside the split lock partway....
on for visual sample is manley 13194which is recessed to accept the wear cap / lash cap...


when you put a cut down thickness lash cap on the valve, they oftentimes pop off..

when the parts are selected properly, there is no need for lashcaps..we lift the valve often .820" with no lash cap on a 11/32 valve stem

Last edited by ordinary builder; 03-22-2011 at 10:42 PM.
ordinary builder is offline   Reply With Quote
Old 03-23-2011, 12:25 AM   #4
Shoedoos
Senior Member
Smoked another BBC
 
Join Date: May 2007
Posts: 1,075
Default Re: SBC lash cap question

a little off the subject but...what's the correct way to install and remove the press-fit lash caps sold by some manufacturers?
Shoedoos is offline   Reply With Quote
Old 03-23-2011, 01:12 AM   #5
ordinary builder
Senior Member
Smoked Another SBC
 
Join Date: Dec 2009
Posts: 11,549
Default Re: SBC lash cap question

there is in fact a special puller tool,


but when tthey are assembled on the heads, with the split locks in place,...they usually will cum off when you squeeze the spring and take out the split locks....
ordinary builder is offline   Reply With Quote
Old 03-23-2011, 01:45 AM   #6
RegalRocket
Senior Member
Smoked Another SBC
 
RegalRocket's Avatar
 
Join Date: Mar 2011
Location: Grand Island, NY
Posts: 5,143
Default Re: SBC lash cap question

Quote:
Originally Posted by ordinary builder View Post
a longer valve with a conventional tip to groove length of .250" is the right way to fix this issue...

other option is to use a split lock that has a undercut / counterbored face so that the lash cap will sit inside the split lock partway....
on for visual sample is manley 13194which is recessed to accept the wear cap / lash cap...


when you put a cut down thickness lash cap on the valve, they oftentimes pop off..

when the parts are selected properly, there is no need for lashcaps..we lift the valve often .820" with no lash cap on a 11/32 valve stem
Some run caps to protect the stems from what i know.
RegalRocket is offline   Reply With Quote
Old 03-23-2011, 08:23 AM   #7
Chris Uratchko
Moderator
Smoked Another SBC
 
Chris Uratchko's Avatar
 
Join Date: Apr 2005
Location: In the shop....
Posts: 30,389
Default Re: SBC lash cap question

I've often used lash caps, and have never had one issue using them.

The nicest ones are from CV Products, xceldyne.... but pricey.

As for removal, I made a little pulling slide hammer tool with fingers that fit under the cap hugging the valve stem...couple yanks with the slide and it pops off.
__________________
Chris Uratchko is offline   Reply With Quote
Old 03-23-2011, 09:55 PM   #8
NASTYCAMARO
Get you some
Smoked another BBC
 
NASTYCAMARO's Avatar
 
Join Date: Jul 2008
Location: SOUTH FLORIDA
Posts: 3,717
Default Re: SBC lash cap question

yes we called comp today they said the .250 is the overall length of the cap. From the top to bottom. Now some come as thick or thicker to .080..They are saying that leaves you .170 for stem height. This I am not to sure about... We will see if what builder above sayes is true. I think he is correct.. Now what about cutting them down if needed?? We are using the stepped down retainers and 4 different kinds of rockers not fitting..Heads are old ass brodix -8
__________________
NASTYCAMARO is offline   Reply With Quote
Old 03-24-2011, 03:48 AM   #9
ordinary builder
Senior Member
Smoked Another SBC
 
Join Date: Dec 2009
Posts: 11,549
Default Re: SBC lash cap question

so,
do you have / are you using the counterbored split locks that will allow part of the cap to sit down lower inside....???

most every STEEL or Stainless steel valve is going to have a surface that has sufficent service life without a lash cap.
a titanium valve COULD,
but I have used titanium valves that have hard metal spray tips on the butt-end tip/stem of the titanium which allows the roller of rocker to run directly on the valve with no adverse wear...with no lash cap.
ordinary builder is offline   Reply With Quote
Old 03-24-2011, 07:44 PM   #10
NASTYCAMARO
Get you some
Smoked another BBC
 
NASTYCAMARO's Avatar
 
Join Date: Jul 2008
Location: SOUTH FLORIDA
Posts: 3,717
Default Re: SBC lash cap question

Quote:
Originally Posted by ordinary builder View Post
so,
do you have / are you using the counterbored split locks that will allow part of the cap to sit down lower inside....???

most every STEEL or Stainless steel valve is going to have a surface that has sufficent service life without a lash cap.
a titanium valve COULD,
but I have used titanium valves that have hard metal spray tips on the butt-end tip/stem of the titanium which allows the roller of rocker to run directly on the valve with no adverse wear...with no lash cap.
Yes counterbore split locks.. We will see what happsens. I will update this week end
__________________
NASTYCAMARO is offline   Reply With Quote
Old 03-24-2011, 08:31 PM   #11
dynodan
Junior Member
Burnout box
 
Join Date: Sep 2006
Posts: 22
Default Re: SBC lash cap question

Crower makes shorter caps if you need. The only thing I don't like about a real short cap is they tend not to stay on the tip of the valve as good when assembling or removing the rockers and if you get valve train seperation you could spit one out.
dynodan is offline   Reply With Quote
Old 03-28-2011, 06:38 PM   #12
NASTYCAMARO
Get you some
Smoked another BBC
 
NASTYCAMARO's Avatar
 
Join Date: Jul 2008
Location: SOUTH FLORIDA
Posts: 3,717
Default Re: SBC lash cap question

Got the shortest cap from comp and threw them suckers on no issues and fixed valve train clearnace issue.. They have a hole in them so you have no suction to tip of valve from trapped oil.
__________________
NASTYCAMARO is offline   Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



All times are GMT -4. The time now is 06:01 PM.


Powered by vBulletin® Version 3.8.6
Copyright ©2000 - 2014, Jelsoft Enterprises Ltd.
Garage Plus vBulletin Plugins by Drive Thru Online, Inc.
Resources saved on this page: MySQL 3.51%
vBulletin Optimisation provided by vB Optimise (Pro) - vBulletin Mods & Addons Copyright © 2014 DragonByte Technologies Ltd.
Yellow Bullet LLC