Neal Scherm wrote:

Hey Paul,
Why did you change your mind about the TO4E and decide to use the stock 91
instead?
Neal

Three reasons.

Cost, cost and cost :-)

Joking of course. cost had a lot to do with it but time was another large factor.
Mazda did a wonderful job on the 1989-92 with integrated oil and water plumbing and 
a compact light weight installation. The cast manifold only weighs 11 pounds.
Probably cost them a billion yen or so for R&D. I did not want to go through
making a manifold and finding out it cracked after xx hours. There are plenty
of these 89-92 turbo's  around with out cracks so that to me is very very important.

If Dave and I can get this to work it will be a major breakthrough in a low
cost turbo system.

Another influence on my decision was Mecanair in Switzerland had also tested the 
stock 89-92  turbo on a dyno and found it suitable for aircraft use.
Here is a picture of their engine and a HP curve.

Paul Lamar
 
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