I'm new to gas engines. I have a Zenoah G38 going on an Ikon Stinson SR-8. I bought a GP big engine resilient mount. According to the GP instructions, attach the engine directly to the plywood, and then the rubber bushed mounts to the firewall. OK, but the engine to plywood joint has four 1/4-20 screws going thru the 1/4 thick plywood into the back of the engine. It seems like this joint is inadequate. When torqued, the bolts will compress the plywood, leaving it wothout much preload. It would seem better if there were hard sleeves in the plywood to limit the compression, and longer bolts with stiff spacers to develop a good preload.
Maybe it works as supplied, but it looks all wrong to me. Any comments?
Thanks.