Lord Engine Mounts

[DonMorrisey]

Hope someone can guide me in the right direction on this. My engine
mount is a dynafocal for a Lycoming O-235 L2C and my project is an
experimental BushCaddy R-120. I have been looking to purchase the
rubber engine mounts. The various places I have looked, list two
different model number mounts for the same engine. For instance a
Grumman with an O-235 L2C may take a Lord Mount number J-7402-24. A
Piper with an O-235 L2C may take a Lord Mount number J-7402-16. And
there is a $30 price difference between the two. How would I know
which one I should get? Does anybody know what the significance of the
24 and the 16 in the model numbers denotes? Any rules of thumb I
should be following here??

Thanks for the help. Don....

[Gig 601XL Builder]

"DonMorrisey" > wrote in message
oups.com...
> Hope someone can guide me in the right direction on this. My engine
> mount is a dynafocal for a Lycoming O-235 L2C and my project is an
> experimental BushCaddy R-120. I have been looking to purchase the
> rubber engine mounts. The various places I have looked, list two
> different model number mounts for the same engine. For instance a
> Grumman with an O-235 L2C may take a Lord Mount number J-7402-24. A
> Piper with an O-235 L2C may take a Lord Mount number J-7402-16. And
> there is a $30 price difference between the two. How would I know
> which one I should get? Does anybody know what the significance of the
> 24 and the 16 in the model numbers denotes? Any rules of thumb I
> should be following here??
>
> Thanks for the help. Don....
>

Complete WAG but I'd the difference is bolt length.

[DonMorrisey]

Well I ended up finding the answer to this question. The determining
factor in the size/type of Lord Mount you use has very little to do
with the engine of choice as many different rubber mounts can be used
for the same size engine. It all comes down to the width of the "cup"
on your dynafocal ring. For instance the ring that is being used to
make the mount for my O-235 L2C has cups/attachment points that are
2.75" wide. These take Lord Mount # J-7402-5 and they sell at Aircraft
Spruce for $239 for the set of four. I haven't checked pricing
elsewhere yet.

Don.