SpeedTalk Store - Opinion Columns

7 degree valve locks recessed for lash cap?

General engine tech -- Drag Racing to Circle Track

Moderator: Team

7 degree valve locks recessed for lash cap?

Postby jetmech727 » Thu May 09, 2013 12:41 am

I am having a bit of trouble finding a 7 degree lock single groove 11/32 valve lock recessed for lash cap. Any help would be greatly appreciated. Long time reader first time writer.
jetmech727
New Member
New Member
 
Posts: 7
Joined: Sun Apr 21, 2013 6:30 am

Re: 7 degree valve locks recessed for lash cap?

Postby Cedarmachine » Thu May 09, 2013 2:02 am

Are you looking for a "Super 7" type lock or the smaller, OE type? The stock type may not be available, but using a lock with a .050" reduced installed height may give you the clearance you're looking for.
Old dog learning new tricks...

"Cedar Machine Service" on Facebook
Cedarmachine
Expert
Expert
 
Posts: 959
Joined: Sun Aug 21, 2011 12:48 am

Re: 7 degree valve locks recessed for lash cap?

Postby lorax » Thu May 09, 2013 2:22 am

Cedarmachine wrote:Are you looking for a "Super 7" type lock or the smaller, OE type? The stock type may not be available, but using a lock with a .050" reduced installed height may give you the clearance you're looking for.

Yeah, there just isn't enough thickness on a OEM type 7* to cut the recess. About the minimum valve tip to use a cap without a recess is .250. I have removed about .025 from a cap.

I take it you need the caps due to a geometry issue. Because I can't imagine a case where you would need lash caps and retainers that aren't 10* or Super 7*
lorax
Guru
Guru
 
Posts: 1785
Joined: Fri Aug 24, 2012 12:00 am

Re: 7 degree valve locks recessed for lash cap?

Postby jetmech727 » Thu May 09, 2013 3:03 am

I am having a rocker to retainer clearance issue. I am running a 1.5" dia spring on a vortec 906 stock
Chevy casting and stock valves. The lash cap was my last ditch effort to try to get the clearance before I have to make a major change with springs. I am running in a circle track class that requires the use of stamp steel rockers.
jetmech727
New Member
New Member
 
Posts: 7
Joined: Sun Apr 21, 2013 6:30 am

Re: 7 degree valve locks recessed for lash cap?

Postby lorax » Thu May 09, 2013 3:29 am

I can see where that spring with a stock rocker could cause a problem.
You could always change the retainers to Super 7 or 10*
lorax
Guru
Guru
 
Posts: 1785
Joined: Fri Aug 24, 2012 12:00 am

Re: 7 degree valve locks recessed for lash cap?

Postby jetmech727 » Thu May 09, 2013 3:37 am

Well I thought about that. And the cost of the swap would be about the same as going to a beehive style spring which would also solve the problem. I'm nearing the end of my budget on this build and was hoping for a cheap way out. I know its probably not gonna happen that easy.
jetmech727
New Member
New Member
 
Posts: 7
Joined: Sun Apr 21, 2013 6:30 am

Re: 7 degree valve locks recessed for lash cap?

Postby lorax » Thu May 09, 2013 3:49 am

jetmech727 wrote:Well I thought about that. And the cost of the swap would be about the same as going to a beehive style spring which would also solve the problem. I'm nearing the end of my budget on this build and was hoping for a cheap way out. I know its probably not gonna happen that easy.

If it was cheap and easy, chkdren would be doing this. :D
lorax
Guru
Guru
 
Posts: 1785
Joined: Fri Aug 24, 2012 12:00 am

Re: 7 degree valve locks recessed for lash cap?

Postby Strange Magic » Thu May 09, 2013 7:02 am

If you have plenty of cash on hand and are not on a budget, than you can afford to do it the wrong way. If that is not the case, you better fix/correct it the right way.

Describe the exact issue.
strangemagicperformance.com
Strange Magic Camshaft Technologies
Decisions on parts and advise should not be based on how much money a company can pour into marketing. This is a common mis-conception in the industry.
Strange Magic
Guru
Guru
 
Posts: 1499
Joined: Sun Dec 03, 2006 1:14 am
Location: New York

Re: 7 degree valve locks recessed for lash cap?

Postby vwchuck » Thu May 09, 2013 8:00 am

Clearance the rocker arm if the interference isn't alot.
vwchuck
Pro
Pro
 
Posts: 436
Joined: Thu May 28, 2009 10:06 pm

Re: 7 degree valve locks recessed for lash cap?

Postby BOOT » Thu May 09, 2013 10:03 am

Useing lash caps means a longer pushrod too, if your geometry is good already.
I know as much as I can learn and try to keep an open mind to anything!

If I didn't overthink stuff I wouldn't be on speedtalk!
User avatar
BOOT
Expert
Expert
 
Posts: 651
Joined: Fri Apr 09, 2010 5:23 pm
Location: Michigan

Re: 7 degree valve locks recessed for lash cap?

Postby jetmech727 » Thu May 09, 2013 11:50 am

Strange Magic wrote:If you have plenty of cash on hand and are not on a budget, than you can afford to do it the wrong way. If that is not the case, you better fix/correct it the right way.

Describe the exact issue.


I'm in the process of correcting the problem. I don't have an unlimited budget but have every intention of assembling this eng correctly. Just like to look at all the options.
jetmech727
New Member
New Member
 
Posts: 7
Joined: Sun Apr 21, 2013 6:30 am

Re: 7 degree valve locks recessed for lash cap?

Postby wyrmrider » Thu May 09, 2013 12:32 pm

first question
is the rocker are geometry exactly right already?
wyrmrider
Guru
Guru
 
Posts: 2627
Joined: Thu Jan 10, 2013 10:52 pm

Re: 7 degree valve locks recessed for lash cap?

Postby jetmech727 » Thu May 09, 2013 4:02 pm

wyrmrider wrote:first question
is the rocker are geometry exactly right already?


It is pretty close but not really able to get exact due to my clearance issue. I just drop the heads back off with my machine shop. They are going to swap out all the 7 degree stuff for the 10 degree stuff recessed for lash cap. Once i get the rocker retainer clearance i can get the geometry correct. Here are a couple little videos i took that might help to explain a little better.

http://www.youtube.com/watch?v=D4koIORPr_M

http://www.youtube.com/watch?v=ZQwUEGYSk6k


I had to hold the camera and turn the motor over so its pretty jerky
jetmech727
New Member
New Member
 
Posts: 7
Joined: Sun Apr 21, 2013 6:30 am

Re: 7 degree valve locks recessed for lash cap?

Postby tsanchez » Thu May 09, 2013 4:10 pm

Unless you need to run stock rockers you should just buy some rollers. You also dont need 1.5 diam springs.
tsanchez
Member
Member
 
Posts: 184
Joined: Mon Jun 20, 2011 4:57 pm

Re: 7 degree valve locks recessed for lash cap?

Postby jetmech727 » Thu May 09, 2013 4:13 pm

tsanchez wrote:Unless you need to run stock rockers you should just buy some rollers



". No roller cams, no roller rockers or roller tips. Factory cast iron OEM
heads, intake and blocks only." from the rule book.

The 1.5 maybe a bit over kill. At this point that is what i have to work with.
jetmech727
New Member
New Member
 
Posts: 7
Joined: Sun Apr 21, 2013 6:30 am

Next

Return to Engine Tech

Who is online

Users browsing this forum: 68-396, Bing [Bot], dirttrack#75, Exabot [Bot], Google [Bot], Yahoo [Bot] and 14 guests