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Chris,
A possible indicator of detonation - could be the rapid
increase in temperature. You don't say how quick, but from what I
understand detonation results in very high chamber pressures and heat
increases. This may quickly (more so than normal combustion) raise
temperatures to high level. Also remember any increase in temps you see in
via the coolant lags the temperatures inside/near the combustion chambers.
As several have mentioned indications of detonation is
flattened springs and damaged corners seals - all of which you seem to
have. I have over heated engines to the point of destroying the rubber
corner seal plugs but have never flatten the apex seal springs.
Good Luck
Ed
Sent: Friday, January 14, 2011 8:19 AM
Subject: [FlyRotary] Re: Apex seal update cont with pix of rotor
andapexseals
I am premixing.
Also, I am only using three lbs of boost. I was under the impression
that this low of boost should not be a problem. I know there are many
other possible causes and will be investigating.
I may start by putting in a lower boost spring in the waste gate
(1.5 lbs) but I am not really thinking this is the issue. Perhaps timing,
as I did play with it quite a bit before I sent my EC2
to Tracy for a check and update. My higher power tests were quite short as
the engine would get hot fast but never to any degree that I would have thought
would be a problem.
I have an intercooler, however, without any airflow
its usefulness during testing is next to nothing. Also, the
intercooler ducting is somewhat minimum at this point.
I thought I would recognize detonation, as Lynn mentioned, but perhaps
not.
I also read on the RX-7 site that the rear chamber is the one to usually
fail, as mine seems to bare out.
Christopher Barber, JD.
Corporal; Patrol Division
Master Peace Officer
Badge 330
Bellaire Police Department
5100 Jessamine
Bellaire, Texas 77401
713-668-0487
From: Rotary motors in aircraft [flyrotary@lancaironline.net]
on behalf of Mark Steitle [msteitle@gmail.com]
Sent: Friday, January
14, 2011 05:52
To: Rotary motors in aircraft
Subject:
[FlyRotary] Re: Apex seal update cont with pix of rotor andapex
seals
My first impression is they got overheated. Each apex appears very
dark, possibly due to heat. Are you pre-mixing or using the injection
pump.
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