Quote:
Originally Posted by HP HUNTER
Carl
Some years back I had a contract to build Winston West 9.1 comp 390 carbed 358 engines. We were quite sucessful and won several races, every engine we built had roller cam bearings, but also were dry sump. I never saw any weird stuff going on in those engines, they made right at 600 HP. Not going to say there was no harmonics, but we never had problems. We also built some with 55 MM babbit, I never saw any difference on the dyno, I did like getting rid of the oil leaks.
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The 55MM bearing you used probably had 3 oil holes = huge oil, A few years ago I had 55MM babbit bearings designed with one oil hole and a groove.
A lot of my customers have said going from Roller to babbit once the adjust the valves nothing changes in lash going to babbit which is good indicator there is less harmonics having the cam floating film of oil VS iron to iron.