X-Mozilla-Keys:                                                                                 
Ken Powell wrote:

The early front cover with the studs for the engine mount will fit the late
model 13b's (1986 and later).  You need a different oil pan and pickup.  Racing
Beat sells the parts for this switch.  I thought that we had decided that this
mount could not be used due to front cover flex causing failure of the oil
o-ring between the front housing and the front cover.   do the recent messages
on this subject mean that if the main motor mounts are near the engine center of
gravity that this is OK???
Ken Powell

Obviously it was strong enough to work in the car. 
I have never heard of that problem. What I have heard however is; it
is tricky to properly install this O ring on some early engines.
As a result some were improperly installed and a loss of oil
pressure was experienced.

The main problem with this mount is the engine is turned around 
in the airplane so a mount would have to be provided under the PSRU 
near the prop bearing to simulate the transmission mount in the early 
cars. That will work of course but it is a little ackward to do. 

Yes. If you provide main motor mounts near the CG of the engine/PSRU/
prop combination the loads on this mount go way down. Almost anything
should work. There is a thrust moment on the mount with a moment arm
of six inches or so. The thrust moment would then be say 1800 inch
pounds.
If the rear mount is 15 inches behind the main mounts there will
be an upload of about 100 to 150 pounds on the back mount while
pulling zero G's. This will be reduced if the main mounts are ahead
of the engine/PSRU/Prop combination and increased if they are
behind the CG.

Paul Lamar
 
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