Timing question
04-22-2012, 09:51 PM
#1
Junior Member
APPRENTICE
Thread Starter
Join Date: May 2009
Posts: 10
Timing question
How much in reality 5 degrees advanced timing will affect?
cam card says that it must be 112 centerline but i only managed to time it 117
centerline without buying any new parts. if i will buy new geardrive it will be 0nly 1 degree off. is there any real difference? engine is 540 bbc with 300 hp on nitrous. ( total 1100 hp)
cam card says that it must be 112 centerline but i only managed to time it 117
centerline without buying any new parts. if i will buy new geardrive it will be 0nly 1 degree off. is there any real difference? engine is 540 bbc with 300 hp on nitrous. ( total 1100 hp)
04-23-2012, 09:03 AM
#2
Senior Member
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Join Date: Aug 2007
Location: Lost Creek, WV
Posts: 533
This is just my opinion. I can't imagine a set up being 5 degrees off and not being able to correct it unless it was assemble wrong by mistake. And BTW if you are at 117 and it's supposed to be 112, then it's retarded 5 degrees. I'd take it apart and realign everything and try it again.
TS1955
TS1955
04-23-2012, 01:52 PM
#6
Senior Member
DYNO OPERATOR
Join Date: Jan 2004
Location: central Illinois
Posts: 459
timing
If it is off 5 degrees retarded I would think you would not have enough exhaust valve to piston clearance and chance severe damage to your engine.
Most good gear drives, belt drives and quality timing chain sets have adjustment of at least plus or minus 8 cam degrees.
I suggest you consult with a local high performance engine builder to solve your problem before spending any additional money on parts.
It is possible the cam is ground incorretly too.
You need to be within 2 degrees of your spec on intake centerline to get your combination to run to its potential.
Most good gear drives, belt drives and quality timing chain sets have adjustment of at least plus or minus 8 cam degrees.
I suggest you consult with a local high performance engine builder to solve your problem before spending any additional money on parts.
It is possible the cam is ground incorretly too.
You need to be within 2 degrees of your spec on intake centerline to get your combination to run to its potential.
04-23-2012, 04:10 PM
#7
Senior Member
SENIOR BUILDER
Join Date: May 2006
Location: Pikeville KY
Posts: 109
My new comp. cam was the same way. It was supposed to be installed at 112 and when I put it in straight up it was at 118. Had to move the crank gear and put a button in cam gear to get it right. Comp say's it must have been a grind issue, however refused to send me another camshaft. This makes two different comp. cams that we have had this issue with. I think that erson will be my next cam choice.....
