Can someone help me understand why Donny says that the heat in the 110" is due to the Compression Ration of only 9.3:1, and should be at least 10:1.
This is the full quote from this month on page 44. He also says an oil cooler would help. Doesn't he know the RK and ULtra's have them?
The CVO 110"
HD IS CURRENTLY HAVING BIG pronlems keeping the cVO 110" from overheating. The rear head gasket is blowing out, away from the oil return hole located between the cylinder and head. This is occurring after as little as 2000 miles of use. It is my belief that Harley had issues during the development of the CVO 110because the engine's compression ratio is low: a paltry 9.3:1. The stock TC 96 Twin Cam has a respectable compression ratio of 9.2:1, which is okay for a stock model. The TC 96 increases it's ratio by .4 points, up from the TC 88's ratio of 8.8:1. In a perfect world, the 110" engine needs a minimum ratio of 10:1 and preferably 10.5:1. Reduced compression ratios lower cylinder head temperatures and the probability of detonation. The addition of an oil cooler would assist in lowering the cylinder head temperatures, as well as control the devastating effects of ongoing detonation."
Does he mean the design was to have higher ratios but there was even more heat so they lowered the ratio? From what I learned here, the 255 cam causes some of these issues.
Comments?