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To find TDC; rotate to get the tip seal
on #1 rotor half way between leading and trailing plug (count flywheel gear teeth
between, rotate half way back). You then need to rotate the rotor 60
degrees in either direction – which means rotating the flywheel 180
degrees.
Worked for me.
Al
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Mark Steitle
Sent: Thursday, September 16, 2010
10:47 AM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Timing
Brian,
I was curious, have you verified that the timing mark
you believe to be TDC is actually TDC? I recall it being mentioned before
that you can't rely on the timing marks on the pulleys as sometimes pulleys get
swapped from one engine to another and may not match up correctly. I feel
it is worth checking. Lynn H. has described how to locate TDC (check
archives). Basically, you remove the leading plug on #1 rotor, rotate
crank until you see an apex seal in the center of the hole, put a mark on the
flywheel (use a temporary pointer for a reference point). Then reverse
rotation until you see another apex seal in the center of the hole, put a 2nd mark
on the flywheel. Now split the difference between the two marks and that
should be TDC. Check that it matches the mark on your pulley.
Mark
S.
On Thu, Sep 16, 2010 at 1:33 PM, <bktrub@aol.com> wrote:
I've
got a 74 x88 catto. The Co was a result of the band clamp not sealing
completely, but I was going to change to 321 or Inconel any way, so I figured
I'd do it now and be done with it. I wanted to be absolutely sure my timing was
correct before going any further down the tunig road. I checked the timing
yesterday, and I was getting the leading plug firing about 10 degrees in
advance of those two timing marks lining up at 1400 rpm. I adjusted it so that
it is now dead on at 1400 rpm. I set it there as a reference, it's easy to
change in Mode 8. There's no reason to go any further in the tuning department
unless I can be assured that the timing is correct. I've got a factory manual,
but have not found any reference to the timng marks or exactly what they signify.
-----Original Message-----
From: Don Walker <drwalker@gbis.com>
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Thu, Sep 16, 2010 11:14 am
Subject: [FlyRotary] Timing
Brian,
Timing is one of the few things I didn't have to mess with. Once all the
other problems were taken care of and the CAS was spaced correctly, the engine
started and ran fine. What a day! I am using the EC-2 default setting for the
renesis as programed by Tracy and have not even paid much attention to it or
even checked it. Good luck on your next flight. I assume you are using the EM-2
and EC-2. What prop are you using? You make a good point on checking for CO. I
just have one of those stick on cards and should borrow a real meter as I am
running SS flex tube also.
Don
RV-8 renesis 76/88 cato
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