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Bill, good point, but since I do regularly check the pressure I do not think for too long. Also, IIRC, the premix oil is primarily responsible for the apex seals, but I would think it could be a factor.
Chris
From: Rotary motors in aircraft [flyrotary@lancaironline.net] on behalf of Bill Bradburry [bbradburry@bellsouth.net]
Sent: Friday, January 14, 2011 8:27 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Apex seal update cont with pix of rotorandapexseals
Chris,
How long did you run with low oil pressure/no oil? The oil cools the rotors, a lack of it could have overheated them and weakened the
springs??
Bill B
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of Chris Barber
Sent: Friday, January 14, 2011 8:19 AM
To: Rotary motors in aircraft
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.
Corporal; Patrol Division
Bellaire Police Department
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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