Ideal compression for a 57h
#21
qThere is no line! The higher the CCP the better the performance but the more difficult the tune. I think in generally, if you go above about 200 CCP you better make sure there is a great tuner/builder involved.
#22
Scott
__________________
HILLSIDE MOTORCYCLE & MACHINE, INC.
HARLEY-DAVIDSON SPEED & SERVICE CENTER
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
Sales/Support 315-495-6650
www.hillsidecycle.com
Walk-in Retail Showroom
Complete H-D Machine Shop
Case & cylinder boring
Complete Cylinder Head Shop
High-Performance Engine Kits
Crank Rebuilding
Direct Link & PowerVision Tuning
Goodson HD Tooling Manufacturer
Maxton Mile World Record
4500 sq ft. facility
OVER 35 YEARS OF H-D ENGINE BUILDING.
See us on Facebook.
HILLSIDE MOTORCYCLE & MACHINE, INC.
HARLEY-DAVIDSON SPEED & SERVICE CENTER
5225 SOUTH MAIN ST., MUNNSVILLE, N.Y. 13409
Sales/Support 315-495-6650
www.hillsidecycle.com
Walk-in Retail Showroom
Complete H-D Machine Shop
Case & cylinder boring
Complete Cylinder Head Shop
High-Performance Engine Kits
Crank Rebuilding
Direct Link & PowerVision Tuning
Goodson HD Tooling Manufacturer
Maxton Mile World Record
4500 sq ft. facility
OVER 35 YEARS OF H-D ENGINE BUILDING.
See us on Facebook.
#23
I think Gary is coming down on the conservative side. I am 600 feet above sea level in south Texas; summers are hot here. Using my calculator, I would run the .030" head gasket; 10:1 static CR. That would put corrected CR at about 9.3 and CCP about 190psi which is about where you would be assuming 85-86cc chambers and a bit of negative deck height which is typical of the TC motor. If you get a bad tank of gas, the motor would likely ping just as bad at 9.8 static as it would at 10. The tune will also make a difference in the tendency toward detonation. I would not run the 57 at 10.5 static but that's your call as well.
There are plenty of 57 cam installs on this forum; maybe some of those guys will chime in on their setup. I have no first hand experience with the 57 cams but from what I read, I think you would be happy with the cam in either configuration.
There are plenty of 57 cam installs on this forum; maybe some of those guys will chime in on their setup. I have no first hand experience with the 57 cams but from what I read, I think you would be happy with the cam in either configuration.
I also agree with the Gary Wallace comment. If I were you, I would contact a reputable builder and ask that same question. I know Gary knows his product better than anyone and I'm not questioning that but the builders know what works in the real-world.
Last edited by UltraNutZ; 11-04-2014 at 05:16 PM.
Thread
Thread Starter
Forum
Replies
Last Post