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05-24-2020, 07:17 AM | #21 | |
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Re: Roller cam bearings
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Duane Hoven 1342 SS/GT |
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05-24-2020, 10:39 AM | #22 |
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Re: Roller cam bearings
Harmonics are probably always there it is when they magnify become intolerable would think is dependent on operating rpm. Friend had severe believe valve train issues with a Ford combination in a Late Model years ago when changing engine builders the second had him take gear away problem solved.
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Frank Ferrucci ?/SA 1271 |
05-24-2020, 02:33 PM | #23 | |
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Re: Roller cam bearings
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The closed tunnel blocks started to show up after Mike Ege, the head of the NASCAR engine shops for Robert Yates Racing and years later, for Roger Penske Racing, built the first closed cam tunnel Ford engine block while working for Yates. Mike later incorporated the same feature on the Chevy and Mopar NASCAR engine blocks while working for Penske. |
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05-27-2020, 06:00 PM | #24 | |
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Re: Roller cam bearings
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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. |
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