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This doesn't make sense, Chris. In the early days with the fixed
pitch prop I could HEAR detonation starting during the runup. I
throttled back a bit and it went away. My seals were undamaged. I
boost 5 - 7 lbs. (44map). The one thing that jumped out from your
list that I never did was play with the timing. Obviously I had the
same lack of inter-cooling during static and taxi tests and my
engine would get hot. The biggest difference between our engines is
the seals themselves - mine are the 3mm 'indestructible' type.
Regards
John
On 1/14/2011 8:19 AM, Chris Barber wrote:
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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