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05-15-2020, 10:37 AM | #1 |
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Roller cam bearings
Are there any real advantages to using a roller vs. a Babbitt bearing? I’ve never had any personal experience using them.
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05-17-2020, 02:31 PM | #3 |
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Re: Roller cam bearings
A very good friend of mine that knows a few things about engine building and find HP told me that when the engine is running, the camshaft is spinning on a film of oil. It isn't dragging against the bearing material.
Dan
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05-15-2020, 03:37 PM | #5 |
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Re: Roller cam bearings
Really interesting question. A person's intuitive reaction would be "of course, look at things like roller lifters and rockers", but I'll bet there aren't many engine builders who have actually done an A-B-A comparison of cam bearings.
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05-15-2020, 04:46 PM | #6 |
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Re: Roller cam bearings
Babbitt is the only way to go.
Roller bearings, when turning the camshaft on the engine stand, the camshaft feels drag free and it turns easily. However, during engine operation and load, there is more drag while turning. When using high spring pressures, the loading may cause the needle bearings to fail. |
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05-15-2020, 06:27 PM | #7 |
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Re: Roller cam bearings
The biggest advantage of roller bearings are that they do not need pressurized oiling. So in most V8's you are blocking off 5 oil leaks inside an engine.
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05-15-2020, 07:20 PM | #8 |
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Re: Roller cam bearings
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05-15-2020, 07:59 PM | #9 |
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Re: Roller cam bearings
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05-16-2020, 04:21 PM | #10 | |
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Re: Roller cam bearings
Quote:
If you have the right cam journal an lifter bore clearance, you will not have to worry. Yes, they are known to create harmonics issues and it shows in Spintron testing. Last edited by SSDiv6; 05-16-2020 at 05:08 PM. |
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