Al Gietzen wrote:

On the e-mail list for the the Velocity builders; one of my fellow Velocity
builders (whom, I believe, is also on this list) posted the following (what
I may refer to as alarmist BS) in response to an inquiry of a builder
considering a 13B or 20B for his airplane:
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........that Mazda rotary engine exhaust heat is all
gathered in one area of the engine, on the bottom of the housing, exhaust is
ALWAYS happening with very little rest between pulses and rotor housing
sealing is done with O-rings that tend to collapse with age/heat. If a
housing side plate/housing seal ruptures, it is equivalent to loosing 1/2
power output in a normal auto engine conversion. On earlier 13B RX-7, the
oil
cooler is mounted over the rubber heater hoses. As the engine ages, cooler
mount O-rings begin leaking and oil soaks the hose. After a while, the hose
ruptures, coolant literally explodes out of the fitting draining the housing
and causing an overheat condition so rapidly that the car cannot be pulled
over to the curb fast enough to save the engine. We get the car in the
service department and all it will do is crank over with no compression and
spout coolant out of the radiator due to water jacket pressurization. A
complete failure. Unless a catstrophic engine failure occurs in an auto
conversion, about the worse you can expect in an auto conversion would be a
blown head gasket 86'ing two holes normally.
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Since I would find it difficult to respond objectively; perhaps someone else
would like to undertake the task.

Al Gietzen

Already did Al. They may not let me post so perhaps someone could forward my
comments.

Paul Lamar
 
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