CLASS RACER FORUM - View Single Post - Why did nhra change the cam and valve spring rule in 1985?

X-TECH MAN · 07-02-2010, 08:27 AM

Billy Nees brought up one more thought.....ENGINE LIFE. Im friends with a very good life long 428 CJ (not noted for long life with stock rods) engine builder and racer. When the valve spring rule was in effect he could run a full year on one engine. Thats was approx 300 runs. Today he said the engines (all brands) when run hard enough to be fast only last about 75 to 90 runs then your on borrowed time. The rings usually go away before that many runs. Wouldnt it be smarter to limit RPMs from a stocker with valve spring pressures rather than making everyone run a diaper to contain the oil and flying parts from an over stressed "stocker" engine?

07-02-2010, 08:27 AM	#7
X-TECH MAN Banned Join Date: Dec 2007 Location: Lake Placid, Florida Posts: 3,203 Likes: 1,047 Liked 235 Times in 110 Posts	Re: Why did nhra change the cam and valve spring rule in 1985? Billy Nees brought up one more thought.....ENGINE LIFE. Im friends with a very good life long 428 CJ (not noted for long life with stock rods) engine builder and racer. When the valve spring rule was in effect he could run a full year on one engine. Thats was approx 300 runs. Today he said the engines (all brands) when run hard enough to be fast only last about 75 to 90 runs then your on borrowed time. The rings usually go away before that many runs. Wouldnt it be smarter to limit RPMs from a stocker with valve spring pressures rather than making everyone run a diaper to contain the oil and flying parts from an over stressed "stocker" engine?