Hi Paul and All

 On the issue of TDC, where is it on a rotary?
 At min chamber position (max compression)?

 Steve Izett
 Perth WA
 Building Renesis 4 Port Glasair SIIRG

 It is when the front rotor has minimum chamber volume
 adjacent to the spark plugs.

 It can be detected in several ways. If you fill the chamber with
 oil and connect a transparent tube to the chamber through the spark
 plug and slowly turn the e-shaft the oil in the tube will
 rise and fall. When it is a minimum that is top dead center.

 Here is another way of checking it if the engine is apart.


 Paul Lamar


 Thanks Paul

 Steve Izett

Paul, I assume these builders are looking for the mechanical TDC point on
an
engine that is not running preventing the use of the timing light. I read
recently that the keyway on the front of the e-shaft is in alignment with
the high point of the eccentric on the shaft. If this is true, then
standing
a short length of keystock on end in the keyseat gives a pointer. Remember
that with the front bolt out the thrust bearing is not restrained, so no
spinning the engine with the starter etc.

george grimes

The Rotary has 2 TDC positions, but for checking the timing, you could undo
the screw of the front pulley and put the key-way in a 9 o'clock position,
that is TDC.

Regards, Werner.

There are two marks on some pulleys but I would not call them top dead center.
There is only one top dead center for the front rotor and one for the rear rotor.
The marks are there for the purpose of setting the timing. It does not mean
the rotar is at top dead center.

Paul Lamar


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