Valve spring life

HIGHOCTAIN2000 · 07-28-2009, 09:37 AM

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

NASCAR Cams are smooth cams and no where the jerk a good Drag Race cam has.

Quote:

Originally Posted by HIGHOCTAIN2000

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

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

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

I really like the 1.5" dia PACs. Got mine from Patterson Racing Engines.

Joe Schweigert · 07-29-2009, 05:00 PM

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

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

Quote:

Originally Posted by Joe Schweigert

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.

07-28-2009, 09:37 AM	#1
HIGHOCTAIN2000 Junior Member Join Date: Nov 2007 Posts: 27 Likes: 0 Liked 0 Times in 0 Posts	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.

07-28-2009, 03:19 PM	#3
rx dealer Member Join Date: Mar 2007 Location: Lake Orion, Michigan Posts: 337 Likes: 12 Liked 53 Times in 13 Posts	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

07-28-2009, 07:23 PM	#4
Danny Ashley Member Join Date: Nov 2001 Location: Marion,In. Posts: 267 Likes: 60 Liked 110 Times in 29 Posts	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.

07-29-2009, 04:12 PM	#5
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: Valve spring life I really like the 1.5" dia PACs. Got mine from Patterson Racing Engines. __________________ Ed Wright 4156 SS/JA

07-29-2009, 05:00 PM	#6
Joe Schweigert Member Join Date: May 2003 Location: Ontario, calif Posts: 211 Likes: 61 Liked 19 Times in 8 Posts	Re: Valve spring life It's like anything "You get what you pay for" Comp #26082 should last over a season __________________ Joe Schweigert 751 SS

07-29-2009, 07:01 PM	#7
Tom Meyer Senior Member Join Date: Aug 2003 Location: Pierce NE Posts: 936 Likes: 77 Liked 351 Times in 120 Posts	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 __________________ Tom Meyer 5240 SS Stock ???