Mailing List flyrotary@lancaironline.net Message #27422
From: David Leonard <wdleonard@gmail.com>
Subject: Re: [FlyRotary] Re: Another Run - with Questions
Date: Thu, 3 Nov 2005 09:14:00 -0800
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Joe,
 
Glad you have it running (closer to my data on your prop).
 
I am with Lynn.  On both of my engines I never see oil pressure less than about 50psi or so, and that is at idle with warm oil.  When the oil is cold or when I am above 3000 rpm I always see oil pressure above 80.
 
Your EGT seems way too high as well.  I see 1600 +/- at high power and around 1000 at the RPM you are talking about (but that is after the turbo, which is probably absorbing 100 deg or so). 
 
Your plan for checking the timing sounds good.  I made the TDC Mark on the flywheel with a reference on the PSRU.  Then it is easy to easy to see and count sprockets to set the timing.  A nice white mark on a sprocket is easy to see with a timing light.  Because the flywheel has a much larger diameter you get better resolution as well.
 
Good Luck,
 
On 11/3/05, Joe Hull <joeh@pilgrimtech.com> wrote:

>> presume you have set the static timing to his recommended 35Deg BTDC.

I'm pretty sure mine is at 5-10Deg BTDC. When I checked using Lynn's patented tooth counting process I found the Crank Angle pickups to be perfectly aligned and the yellow dot was about .5" ahead of the pointer.  

Here's what I'm guessing I need to do:

  1. Set engine at TDC (I did mark the TDC tooth on the flywheel so that should be easy).
  2. Mark the main pulley wheel for TDC
  3. Measure the circumference of the main pulley – divide by 72 to get 5Deg increments (e.g. 6.5" = .090") and/or measure the flywheel (bigger circumference and therefore better resolution)
  4. Make a mark at the 35Deg position (or .135 of the circumference from TDC)
  5. Adjust the Crank Angle Sensor accordingly.

 

Does this sound right?

 



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