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Long-EZ O-320 engine mount question

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I need a set of Dynafocal "sandwich" style rubber engine mounts for a Long-EZ with E2D Lycoming O-320. The existing ones are worn and unusable, markings unreadable.

Spruce lists "50402-5 ASSY" as "used on many homebuilts including the Defiant and Long-EZ":

VIP Mounts website indicates "VIP 50402-5" are similar to "Lord J-7402-16" and "Barry 94150-01".

Is "VIP 50402-5" the right choice?


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As I understand it, the airplane manufacturers specify very slight differences in rubber composition for vibration control and that's why there are so many different mounts.   I think most of us the J-7402-X version sold by Spruce for the O-320s.  Just check that your dynafocal cups are the 2 3/4" size.  I imagine any isolator for an O-320 engine would work just as well.  You might find some on ebay but I'd avoid really old ones.  A few years ago, I swapped my top and bottom isolators.  Yeah, I am cheap.  This PDF gives some info on sizes.


Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold

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  • 2 weeks later...

This design has the inner part rubber coat filled with some kind of gel or memory foam or whatever it is 🤷‍♂️

Yeah, I've seen that before.  It must have some vibration-control function but I bet it is minimal.  The two rubber donuts are clamped together on the steel center bushing that is inside the rubbery stuff so I expect most of the flexing is in the larger donuts.  I think I have seen Vans owners asking about the "rubbery material leaking out of [my] engine mounts".  🙂  Nothing to fret over, I guess.

Cozy IV N13AM-750 hrs, Long-EZ-85 hrs and sold

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