Paul, can you let me know why the left and right mounts are at a different
 height?

 Thanks

 Andrew Binks

 How are you measuring that?

 Don't judge on the bottom edge.

 Bolt on the cups and place a metal straight edge across the bottom of the
 cups.

 The plate is otherwise unsymmetrical for several reasons. Number one the
 Mazda bell
 housing bolt pattern is unsymmetrical. The plate also allows for a
 radiator mount on
 the right side of the engine (the plug side). The exhaust side has
 clearance for the
 exhaust pipes and the motor mount tubes.

 What kind of an airplane are you building?

 Paul Lamar

 Paul,

How easy is it to get to the spark plugs for replacement with the side mount radiator?

Bill Schertz

Stand on a stool and reach over the diffuser.
One could also put a door in the diffuser wall.

Paul Lamar

I now have my oil cooler located on the plugs side of the engine.  It is
positioned inline with the thick (20B) center housing.  The plenum is
attached with two piano hinges.  To access the plugs I pull the pins on the
piano hinges and pop off the plenum.  Plugs are very easy to reach with the
plenum out of the way.

Mark
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