VO wrote:

I believe it was cause by different problem, not by

detonation/leaning.

In case detonation/leaning you should see symptoms on all engine
almost equally, of course if ignition and injection system works

same.

Tension bolts shearing and rotation of front housing it could be

connected

with transmission torsion against engine, where middle housing was
hold against car frame.

Vlad

N1UT - Velocity Elite, RG, Mazda 20B rotary, NA - in progress
http://www.N1UT.velocity-air.com

My experience with boosted rotaries is that it is the rear rotor that

detonates

first, probably because it runs hotter.  Do not know if this applies to

the NA

wankels.

Hans

The leaning I was referring to was at altitude and low power. Tracy Crook

and Klause

have both been experimenting with this. Klause runs his O-200 100 degrees
lean of peak EGT. He claims a good ignition system can fire this reliably.
Perhaps you can fill us in Tracy.

I have no doubt under high boost a lean condition can cause detonation.

Paul Lamar

Tracy Crook wrote:

I agree with your accessment Paul.

Running the 9.7 - 1 rotors in a normally aspirated engine, I can't get the
engine to detonate at any combination of  throttle setting and mixture.
Other significant conditions which might affect the results are ignition
timing of 20 - 23 BTDC (both plugs, I simply disagree with those who say
that a 15 degree retard on the trailing plug is better), 87 octane unleaded
fuel, and a worst case air temperature of 37 F. (colder is worse for
detonation, at least thats the way it works in my car).

Tracy Crook
rws@altavista.net
www.rotaryaviation.com

 
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