CRG Discussion Forum
Welcome, Guest. Please login or register.
Did you miss your activation email?
September 22, 2014, 05:23:26 PM

Login with username, password and session length
Search:     Advanced search
Welcome to the CRG Discussion Forum!
Forum registration problems: Make sure you enter your email correctly and you check your spam box first. *Then* email KurtS2@gmail for help.
104680 Posts in 12246 Topics by 4719 Members
Latest Member: Baconcks
* Home Help Search Login Register
+  CRG Discussion Forum
|-+  Camaro Research Group Discussion
| |-+  General Discussion
| | |-+  Adjusting rocker clearance on 30-30 cam.
« previous next »
Pages: 1 [2]  All Print
Author Topic: Adjusting rocker clearance on 30-30 cam.  (Read 5348 times)
aaronz28
Member
***
Posts: 94


View Profile Email
« Reply #15 on: April 07, 2009, 01:17:47 PM »

this is my point exactly....

my 302 idled with 11 inches of vaccuum with the 30-30 set at .030

when i put it down to .026 i lost 4 or 5 inches HG, exacltly in the ballpark that Glenn just said......subsequently, the Powervalve had to be changed, and I'm sure other things would need to be adjusted for optimum performance... i.e. jetting, timing

this effectively makes that big arse cam even bigger... especially in a no torque 302.

now... on top of that... a 64 or 65 FI vette (which also used the same cam) will not idle properly on that low of vaccuum... I tried it on that car as well...


seems like .004 couldn't possibly make a difference, in the lash setting... but if it makes enough of a difference to kill 5 inches of Vaccuum???

A

 
Logged
jdv69z
Hero Member
*****
Posts: 641


69 RS Z/28 52E


View Profile Email
« Reply #16 on: April 07, 2009, 03:29:21 PM »

We set .026/.026 cold with roller tip rockers and have no problems. I idle the car at about 1000 rpm's and still stop pretty easy.

I 've used the 30 30 in my 64 vette since 72. I've always set it .026 with the Comp cams 1.52 roller tips. It will idle at 850 rpm with 9 to 10 inches of vacuum with the 400-- 6 to 7 inches of vacuum with a 350 and with a 327 about 5 to 6 inches of vacuum. This is with the dual quads. I hope this helps.

It does. Thanks.

Jimmy V.
Logged

Jimmy V.
Stingr69
Member
***
Posts: 404


View Profile Email
« Reply #17 on: April 08, 2009, 05:31:02 AM »


my 302 idled with 11 inches of vaccuum with the 30-30 set at .030

when i put it down to .026 i lost 4 or 5 inches HG, exacltly in the ballpark that Glenn just said......subsequently, the Powervalve had to be changed, and I'm sure other things would need to be adjusted for optimum performance... i.e. jetting, timing

this effectively makes that big arse cam even bigger... especially in a no torque 302.

now... on top of that... a 64 or 65 FI vette (which also used the same cam) will not idle properly on that low of vaccuum... I tried it on that car as well...


seems like .004 couldn't possibly make a difference, in the lash setting... but if it makes enough of a difference to kill 5 inches of Vaccuum???

A

 

.004" tighter lash added 12 degrees of set-to-seat duration with your 1.52 rockers. It's not the lift that gets you, it's the duration.

With the stock stamped rockers (lower ratio), you should not see such a huge drop in vacuum when lashing at .026".

-Mark.
Logged
Pages: 1 [2]  All Print 
« previous next »
Jump to:  

Powered by MySQL Powered by PHP Powered by SMF 1.1.19 | SMF © 2013, Simple Machines Valid XHTML 1.0! Valid CSS!
Page created in 0.079 seconds with 17 queries.