These engine mount bushings are made of a special urethane formula which outlasts most other mounts. They have been in use on smaller 4 cylinder Lycoming engines from the 0-235 series to the GO-480 series for years, and are now available to the experimental aircraft market.
Face it, urethane is a much better material for these mounts! But be careful in ordering - I have the O-235-C (with no suffix!), and these dont fit. The neck coming off the small end of the cone is found on later O-235s, but not my ol reliable. Replacing the ones that had been on the engine for 18 months - it was fun to see the deformation in the old mount. Makes me wonder if I will have to worry about the new mounts and the spinner rubbing the cowling.... Pretty clearly I should have replaced the conical mounts on about a 5 year interval.
will yse them on my o-290 as Ive got them on my o-235 they go on nice
They dont fit like stock ones, I have 0-320 A2B. They are too long and the cone is smaller on the small diameter of cone. Not sure how they are suppose to work but I cant use them and I needed them today to mount my engine....
Approximate dims: 1.625" Diameter of Larger End, .84" Diameter of Smaller End, .50" ID, 1.325" Length