Was checking the net for available 20b's and found something that was
interesting.

*1993 Mazda RX-7 with a 3 rotor 20B engine conversion. Professionally
built with all new parts including housings, 3mm apex seals, ported and
polished, extra dowel pins, aluminum flywheel with ACT clutch, 900cc
primary inj., 1200cc secondary injectors, 20B fuel pump, RC Engineering
big bore throttle body, T78 turbo with .96 A/R. boost controlled, turbo
timer, 3 inch stainless down pipe, 5 inch pettit racing mufler, custom
intercooler, radiator and pettit subframe. Microtech computer and lots
and lots of extras. Carbon fiber hood.*
*Twin oil coolers, cross drilled and slotted rotors, GAB 8 way
adjustable struts, front and rear strut bars, racing beat springs and
sway bars, Racing Hart 17 X 8 and 17 X 9 wheels with Kuhmo Ecsta Supra
tires.*
*This car is in immaculate condition, it has no dents or scratches and
had  never been involved in any accident.  This car runs like a dream
and it can be use as a daily  driven vehicle.The engine makes 425
horsepower at  the rear wheels at only 10 pounds of boost and capable of
over 600 HP. The torque in this car is so amazing that it smoke the
tires in the first three gears if you put down the gas pedal. It was
tuned by SIGUEL RACING in PR who owns the fastest Mazda race car in the
world.*
**
I'm not as educated as you Paul on the rotary but I'm curious as to some
of the references this seller makes.  Like on the turbo, "*T78 turbo
with .96 A/R. boost controlled, turbo timer,".  *Is that a brand of
Turbo and .96 A/R (air ratio?) timer?  Where do I need to go to
understand what he's saying.  Also, "cross drilled and slotted rotors".
Instead of the combustion indentions being "scooped" are they slotted.
I duunno.

Allen Slominski
Freshman@acre_U

A/R describes a turbo parameter. The HP of the turbine changes
as you change the A/R. In this case smaller A/R speeds up
the exhaust gases getting more HP out of the turbine so it can
accelerate faster driving the compressor. Reduces the turbo
acceleration lag. Not what you want for an aircraft unless you
are going to turbo compound it. T78 is a Garrett product I think.
The timer keeps the engine idling after you get where you
are going and get out of the car so the turbo cools off
slowly.

The cross drilled rotors refer to the brakes. This will be a very
expensive car.

Paul Lamar

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