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-   -   Valve spring life (https://classracer.com/classforum/showthread.php?t=19305)

HIGHOCTAIN2000 07-28-2009 09:37 AM

Valve spring life
 
I hear talk of superstock racers that have to change valve springs after 10 runs, is this for real? I know they run nearly an inch of lift, and almost 9000 rpms, but nascar runs 9000 for 500 miles. THOUGHTS.

BlueOval Ralph 07-28-2009 11:15 AM

Re: Valve spring life
 
NASCAR Cams are smooth cams and no where the jerk a good Drag Race cam has.


Quote:

Originally Posted by HIGHOCTAIN2000 (Post 132011)
I hear talk of superstock racers that have to change valve springs after 10 runs, is this for real? I know they run nearly an inch of lift, and almost 9000 rpms, but nascar runs 9000 for 500 miles. THOUGHTS.


rx dealer 07-28-2009 03:19 PM

Re: Valve spring life
 
It depend on what class you're running. Since I use the "441" casting SBC head i'm limited on how big my valve spring pocket can be cut for the 1.64 spring without hitting a water jacket, so I use the 1.55 spring and yes you get only 10-15 runs out of a set, and it could go either way depend on how high you rev your motor. Luke

Danny Ashley 07-28-2009 07:23 PM

Re: Valve spring life
 
I was told the hot set-up in valve springs for Super Stock are PAC . Used on a lot of Pro Stockers and Comp engines. Suppose to have long life. Check them out at racingsprings.com.

Ed Wright 07-29-2009 04:12 PM

Re: Valve spring life
 
I really like the 1.5" dia PACs. Got mine from Patterson Racing Engines.

Joe Schweigert 07-29-2009 05:00 PM

Re: Valve spring life
 
It's like anything "You get what you pay for" Comp #26082 should last over a season

Tom Meyer 07-29-2009 07:01 PM

Re: Valve spring life
 
I use 947 comp springs 1.85 installed ht 400 lbs on the seat will set in about 380 to 360 will last me 2 years or about 300 plus runs on my 283 520 head. I shift at 9000 same in the lights. Camshaft and rockers ratio have a lot to do with it along with harmonics. Tom

Jesse Knapp 07-29-2009 07:04 PM

Re: Valve spring life
 
Quote:

Originally Posted by Joe Schweigert (Post 132347)
It's like anything "You get what you pay for" Comp #26082 should last over a season

I agree. I used Comps #947 springs and they lasted the season.


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