Indexing a crankshaft

Fred Elsass · Today, 06:38 AM

Can anyone out there tell me how much HP would be gained by indexing an after market crankshaft from a reputable company?

I understand that indexing a crankshaft is to assure that each and every journal on a V8 engine is exactly 90 degrees apart.

Would this not be tantamount to attempting to build a Formula 1 engine to run Stock Eliminator?

Sarge

Billy Nees · Today, 08:33 AM

If I needed to get a crank done from scratch, I would probably have it stroked and indexed. Otherwise, I wouldn't bother. Not for a (relatively) low HP and low RPM engine.

1347 · Today, 11:28 AM

Take what your engine makes in hp and divide it by cubic inches, now figure out the displacement increase and plug the hp per cube into the new formula. That should give you a start. It may increase more due to the compression increase also. Thats what was explained to me many years ago by an old time.class racer.

Today, 06:38 AM	#1
Fred Elsass Member Join Date: Mar 2009 Posts: 135 Likes: 1 Liked 323 Times in 46 Posts	Indexing a crankshaft Can anyone out there tell me how much HP would be gained by indexing an after market crankshaft from a reputable company? I understand that indexing a crankshaft is to assure that each and every journal on a V8 engine is exactly 90 degrees apart. Would this not be tantamount to attempting to build a Formula 1 engine to run Stock Eliminator? Sarge

Today, 08:33 AM	#2
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,512 Likes: 3,621 Liked 7,908 Times in 1,754 Posts	Re: Indexing a crankshaft If I needed to get a crank done from scratch, I would probably have it stroked and indexed. Otherwise, I wouldn't bother. Not for a (relatively) low HP and low RPM engine. __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K

Today, 11:28 AM	#3
1347 Senior Member Join Date: Aug 2007 Location: Monroe Twp NJ Posts: 516 Likes: 1,059 Liked 1,032 Times in 283 Posts	Re: Indexing a crankshaft Take what your engine makes in hp and divide it by cubic inches, now figure out the displacement increase and plug the hp per cube into the new formula. That should give you a start. It may increase more due to the compression increase also. Thats what was explained to me many years ago by an old time.class racer. __________________ Duane Hoven 1342 SS/GT