Blower motors
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Blower motors

  1. #1
    Senior Member eliminator's Avatar
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    Default Blower motors

    I am building my 1st blower motor and got some questions, I have the speed pro forged pistons with the coating on the skirts, how much clearence is needed on the side walls? cold block - hot pistons dont want any scuffing issues. also what about ring end gap? how much ? this is a blown 454 - 60 over with 871 . thanks eliminator
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    steelcomp was here
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    got a part no?
    You should have all this info with the parts
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    it had #s with the pistons, but machinest thought might have to go larger for marine blower application because of always running too cold ? and pistons getting hot and swelling. p/n l2453f speed pro
    Last edited by eliminator; 01-15-2009 at 02:56 PM. Reason: forgot numbers
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    steelcomp was here
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    Quote Originally Posted by eliminator View Post
    it had #s with the pistons, but machinest thought might have to go larger for marine blower application because of always running too cold ? and pistons getting hot and swelling. p/n l2453f speed pro
    Typically I have the machine shop add .002 for marine use. Your machinist is correct. I show that piston calling for a .0060" skirt clearance, so I would have him go .008". Rings depend on how much HP/boost you're going to build.
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    Very mild set up, guessing 5-8 psi boost? ring gap should be?
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    9 and 22
    Quote Originally Posted by gn7 View Post
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    eliminator there is a thread in the Forced induction that bounced from 24 to 32. Thousands that is. I don't have an intercooler yet so I gapped for 30 thou.

    I got so many answers on this question and ended up playing it safe after talking to a few here in AZ that build Blower motors. I may loose a tad bit of compression but The rings wont bind
    Takin it home

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    Thats it? nobody else has any suggestions? what rings would be best?
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    steelcomp was here
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    Quote Originally Posted by eliminator View Post
    Thats it? nobody else has any suggestions? what rings would be best?
    Run a good quality set of Moly rings like JE's and you'll be fine. Follow the manufacturer's specs on gap. If you feel like throwing money at it, run Hellfires or a turbo/blower dedicated ring, but IMO for what you're doing, it's not necessary. JE's are excellent rings.
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    Thanks for the info
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