> > Well, after months of rebuilding motor mount pieces and lots of
> > input from the guys here on the list, I am finally finished with
> > my RV-4 motor mount.  Note that this mount is for a PP motor so
> > I had a little more flexibility on the left side of the engine
> > since there is not a 4 or 6 port intake manifold  to make things
> > more difficult. The advantages of this mount is that
> > for a narrow single place or tandem aircraft there is much more
> > room under the engine for radiators and exhaust;  the value of

> > this cannot be underestimated unless you have tried to fit all
> > of this stuff in a 24" wide cowling!  Pictures are attached.
> >
> > Ken Powell

    BTW, the original conical mount from Van's weighed 11 lb 6 oz.  The
    new mount
weighs 13 lb 3 oz, or 1 lb 12 oz more.  Lot's of extra .75" tubing
there!
    The engine adapter mounts weighed a total of 5 lb 12 oz.  The
    lower mount
weighed 2 lb 12 oz, the right upper weighed 1 lb 11 oz and the upper
left mount weighed 1 lb 12 oz.  The three adapter mounts were
weighed together as well as individually to eliminate rounding

errors.  Note that the upper adapter mounts (on both sides) tie the
front and rear of the engine together to eliminate extra loads on
the tension bolts.

Ken Powell