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OutofTouch

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Cam Shaft Duration @.050 ?
« on: February 10, 2022, 10:51:53 am »
I think I have found my cam, still need to talk to Bullet on its specifics. What has me bothered a bit is the duration is 259 and 265 I/E. Is this getting  to close to the magic number of 275 degrees to cause the engine to start sucking water back into the chambers from the water injected headers? I don't need to hydraulic the engine.

Bob
  • Boat #1: 1984 Eliminator Formula
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The_Dean_85

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Re: Cam Shaft Duration @.050 ?
« Reply #1 on: February 10, 2022, 03:19:36 pm »
Following, I always wondered the same thing


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mash on it

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Re: Cam Shaft Duration @.050 ?
« Reply #2 on: February 16, 2022, 08:10:56 am »
I used an extreme marine comp cam, flat tappet, .575/.578 lift, 254?/264? at .050", with injected headers, without any drama.
Water valve is at the driver's seat.(Water wide open at the driver's seat wasn't enough to bother it at idle, either, and was gate valved at the pump too.)

Dan'l
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OutofTouch

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Re: Cam Shaft Duration @.050 ?
« Reply #3 on: March 02, 2022, 05:00:24 pm »
Thanks Dan'l.

That's the information I was looking for. I use the Bassett control T and the cooling water is off at idle. The only time my cooling water hasn't been off was the day I had the spring break but I don't think the duration on the cam I was using is that high. Engine went together back in the 80's. May talk to Bullet to calm it down a bit. I am thinking the concern about reversion at idle when you don't have the velocity in the pipes, not at 3-5000 RPM's.

Bob
  • Boat #1: 1984 Eliminator Formula
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