Somewhat related to EFI

[Greg Hermann]

At 11:52 AM 10/12/01, A70Duster at aol.com wrote:
>I'm rebuilding a SBC in a boat a jet drive.  I'm adding a supercharger
>(ATI) and building the engine around the supercharger.  The previous
>engine was a 350 SBC with about 10:1 pistons (280°, 480") cam, fuelie
>heads, and the engine would rev to 4000 RPM WOT.  I'm guessing that the
>engine will be closer to 5000 RPM with the supercharger at WOT.
>
>I'm using lake water to cool the engine, so temps seldom get over 140°F.
>A cooler block will not expand as much as a hotter block.
>
>With the supercharger, more air and fuel are added, which generates more
>heat.  Hotter pistons expand more.
>
>Now, to add to the confusion, I'm going with hypereutectics, which don't
>expand as much as cast/forged pistons.
>
>Boost levels - no more than 8 psi without a intercooler, and more than
>that with and intercooler.
>
>My question is what should piston to cylinder wall clearance be?  The box
>says 0.001" clearance, the machinist did 0.002" cause of the supercharger.
>Then I read the extra clearance for a boat engine cooled by lake water.
>
>
>I'm hearing multiple opinions (that off-set each other).  So I need to use
>"Does it make sense" filter.
>
>
>It does have EFI, so it kinda belongs.
>
>Thanks in advance.

I would bet on .002" being OK as long as you are using a lake water cooled
intercooler.

Greg


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