Of course there is always the way that
doesn’t require any parts – well; maybe a piece of wire, or
something to use as a pointer near the teeth on the flywheel ring gear.
-Remove the rotor 1 spark plugs (and one
from rotor 2 to relieve the compression).
-Turn the engine until the tip seal on
rotor 1 is in the center of the leading plug hole. Mark the gear tooth at
the pointer.
-Turn the engine until the same tip seal is visible in
the trailing plug hole. Mark the tooth at the pointer.
-Now turn the engine back to the gear
tooth at the pointer that is half way between the 2 marked. The tip seal
is now at TDC.
-The center of the combustion chamber is
60o on the rotor from the tip seal; or 120o on the E-shaft.
- Count the total number of teeth on the
ring gear, and divide by 3. Now rotate the engine by that number of teeth
(either direction) and rotor 1 will be at TDC.
Al G
-----Original Message-----
From: Rotary motors in aircraft
[mailto:flyrotary@lancaironline.net] On
Behalf Of Steven W. Boese
Sent: Sunday, February 27, 2011
4:10 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Steve
Boese TDC Finder
I like
this better than what I came up with. It will be easier to find the parts
and assembly will also be easier since none of the initial parts need to be
modified. As long as one is careful not to draw the water or oil into the
engine, it will also be easier to use. Although there always seems to be
a better way to do something, this seems as good and simple as it can
get. No more excuses for not knowing where TDC is.
Steve
Boese
From: Rotary
motors in aircraft [mailto:flyrotary@lancaironline.net] On Behalf Of bktrub@aol.com
Sent: Sunday, February 27, 2011
2:35 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] Re: Steve
Boese TDC Finder
You can
get an air hold, essentially a spark plug hole adapter that goes on a
compressed air hose, for about $6 at NAPA. It's used to hold a valve in place
while you change the valve seals. You can use it to find TDC by putting it in
the plug hole, running a tube to it and putting the end in
a jar of water or oil. Turn the engine slowly until the point where the bubbles
stop and the water just starts to go up the tube. That's TDC.
-----Original Message-----
From: dlomheim@aol.com
To: Rotary motors in aircraft <flyrotary@lancaironline.net>
Sent: Fri, Feb 25, 2011 8:10 pm
Subject: [FlyRotary] Steve Boese TDC Finder
Steve:
Please don't think your cool invention wasn't appreciated by those of us at
Paduca... I for one grabbed one and plan on using it to find TDC prior to
re-installing my CAS...