Somewhat related to EFI

[Greg Hermann]

At 8:20 PM 10/12/01, Seth wrote:
>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

Not to mention that the engine would likely be a lot better off with forged
pistons (of 4032, the low expansion alloy) with .002" clearance than with
hyperyoujunkits !

Greg
>
>
>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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