The one thing that you do have to worry about with leaning is detonation.
When I bought my engine the guy showed me one that he was a bout to rebuild
because of detonation caused by a transiently lean condition.  The

detonation

caused the front housing to rotate relative the rear, shearing 2

tension bolts

and cracking both rotor housing and front and rear housings.  The good news
is that this was a race engine run at very high boost, so it probably wont
apply to most of our applications.  The other good news is that the
intermediate housing, both rotors and e-shaft were un- dammaged !!!

Dave Leonard

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

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