Somewhat related to EFI

[Seth]

It makes sense to me. 0.001" is on the tight end of the scale for a SBC
in my opinion. So 0.002" sounds pretty good to me. As long as it isn't
0.0028" rounded down.

-Seth


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.
> 
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