Ed Anderson wrote:

Chrissi,

    Can the manifold connection to the block be reversed - Will it fit such
that the exit pipe points toward to front cover rather than the flywheel?
My stock 91 can be switched that way and I am curious as whether this one
can also be switched.

Thanks

Ed Anderson

Ed,

I also have the stock '91 be it cannot be reversed without re-drilling the mounting holes as they are not symmetric.  also remember that if you reverse it, then it places the turbo much lower and you will then need a return oil pump.

Dave Leonard

I am slowly coming to the conclusion that we don't need a waste gate if you
use a TO4. Greg Richter and Dave Garber are both getting away with out waste
gates. This I think has to do with several factors. 

One: the rotary will tolerate
a lot more boost than Greg is asking of it. In Dave's case it is just plain
remarkable as he is looking at 55 inches of Hg manifold pressure.

Second: if you use a large enough turbine with a small enough compressor
the system will limit the boost on its own. Now I am not sure what the critical
altitude will be however and I sure don't know what those part numbers are
right at the moment.

Three: waste gates are necessary in cars because you want the turbine to spin
up quickly when you nail it. That is not so important in an aircraft engine.

Fourth: since Chrissi's HKS manifold waste gate branch goes off towards the flywheel
end it seems like it will interfere with the motor mount in that area.
A possible solution is to move the motor mount outboard and use a large
hole in the motor plate to pass the waste gate branch through if a waste gate
is required. The starter wants to occupy this area as well.

Fifth: Greg's HKS manifold seems to be more suitable for aircraft use as the 
waste gate branch is much shorter and much closer to the manifold proper. Is 
Greg's the 88-91 HKS version?

I sure hope the stock turbo works as it seems to solve many of these
problems with its built in waste gate.

Paul Lamar
 
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