Scott Speirer wrote:

Mike Pienaar wrote:

On Paul Yaw's site (http://personal.riverusers.com/~yawpower/ac13bt.html) he
comments as follows:

"The turbo (From Turbonetics) is a Garrett TO4E, 50 trim compressor, P trim
exhaust, with a modified 1.3 AR ratio housing. The turbine wheel is made of
inconel. The center section is water cooled. The turbo feeds the engine through a
small intercooler made by Spearco.

Boost is 6.4 psi at 6500 rpm. (43" Hg. manifold pressure.) Boost is controlled by a
Turbonetics "Deltagate""

If I remember correctly he used to have a section on his website that described his
problems with choosing the correct turbo but I cannot find it now.

I'm very interested to hear how you get on

Mike

Yes, I've read from Paul Yaw's site about his turboed 13B.  Near the end of the webpage
on the engine, there's the clip:

"During the installation, Sven took detailed notes, and many color photos. The result is
a book with 200+ pages
which covers everything from cooling to engine mounts. This is meant to give real
solutions to the problems
encountered in auto power conversions. These should be in print (In color.) by the end of
October."

I'm looking forward to that book becoming available.

I'm currently not keen on using the turbo they've chosen, because the airflow has been
improved so much over a stock 13BT by all the modifications they did with reshaping the
ports, timing of the ports.  They claim an improvement of 34%.  Pretty good.

Scott

Klause gave me this brochure on the Mecanair side port 13B turbo engine. 1200 mbar of
boost
is not much. About 17.4 psi absolute or 2.9 psi boost. This is the stock Mazda
turbo charger and cast iron exhaust manifold I think. This is also very modest
RPM as the PSRU ratio is 2.8:1 or 2000 prop RPM is only 5600 engine RPM.
The Mazda 13B is loafing along at 200 HP, 5600 RPM and 2.9 psi boost for takeoff.
Most people are running 6000 to 6500 RPM for takeoff. At about ten HP per 280 RPM
the stock engine looks like it will put out 215 HP at 6000 RPM with 3 psi boost.

http://www.mecanair.ch

Paul Lamar
 
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