Supercharger info

[Chris Conlon]

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Dan Zorde wrote:

> Thanks for the info so far.  The intent is to generate as much
> boost as possible, which is why I'd like to know how much boost
> it can put out before it self destructs (or the engine), so it
> definitely won't be running slower.

In theory you can get as much boost as you like by using different
crank:SC drive ratios. 

The problem you will have is that the thermal efficiency drops *way*
off as boost rises, pushing intake temps way up. That, plus the boost,
will usually push an NA engine into serious detonation unless the CR
is unusually low. An intercooler helps, water injection helps. (I have
to agree with the poster who said go turbo for max power or max boost.
A Roots SC is great for low end power though.)  Not to mention the SC
will consume more and more crank HP as boost rises, and belt slip will
become a problem.

HKS, Blitz and Cusco make *crank* pulleys for the 4A-GZE, they replace
the engine's crank pulley, not the SC pulley. (Yes, this spins the
water pump faster as well.)

Supposedly the 1991+ Japan-spec SC12 had a smaller pulley on the SC
unit, also someone on the MR2 list looked into a custom job. Not too
hard if you didn't mind losing the clutch.

There is also an SC14, which is ~1420 cc displacement. Since you're
looking at a total custom job, I'd get that instead. I didn't notice
that you're in Oz before (sorry), you may be able to get the SC14
off a 1G-GZE. (We don't get that engine in the States.) It's also
a TRD bolt-on for the Previa engine.

Word is that Eaton is the OEM for these units. Just a rumor I heard,
but maybe worth looking into. Also Eaton supposedly has newer
designs that are more efficient, and if you're already looking at a
full custom job, why not use a better unit?

   Chris C.

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