Thread: Motor Mounts

Umm wow, thanks guys for all the input, this is greatly appreciated. God you guys are just awesome!!!

IMO putting metal blocks instead of rubber or poly mounts is a bad idea. The main reason that they are made out of rubber is to absorb some of the resonance and energy coming from the metal going into another metal. If is better than we should also all run metal rods instead of struts and springs. I guess I don't understand how metal could be softer than poly or rubber to cause less vibration?

I would make your own solid mounts out of fluid filled stock mounts from the auto parts store. You can fill them with either poly or black RTV you just have to decide what shore rating (hardness) you want.

As far as vibration with poly uppers or solid lowers....It is almost a must to adjust your idle RPMs up higher. The stock setting is pretty low and doesn't account for the harder mounts.

comparing shocks and suspention componets to engine mounts is silly they do diffrent thisng. one supports the engine tot he chassis the other controls chassis movement and stability.

rubber is there for comfort and reduction of customer complaints not becuase it is better. solid mounting is actualy better more power is sent to the wheels insted of being used to twist the engine on the rubber.

look at engine plates for race cars if they where not better for racing would they use them?

i had poly and solid lowers in my old 01 GT with an XP cam set to idel at 650rpm it was perfectly fine. the shaking did not bother me at all but it was there

wait wait wait, where did you find that poly filler? What auto parts store?

i used aluminum blockes my grandpa had sitting around his shop

and i actualy lowered the idle. stock is around 700-750



and the engine mounts are in no way shape or form suspention components. they may do a simular job isolating energy but for complatly diffrent reasons

you are arguing with a certified tech i can tell you for a fact engine mounts, motor mounts, tranmission mounts are not part of the suspention system of an automobile. never have been never will

also getting rid of vibration is a ride confort thing not a real issue and the only reason mounts are made from robber. grandma would complain

Solid mounts, especially when cammed affect other things...like brackets and components in the engine bay.

Ask me how I know with a 625-650 idle on a Thrasher Cam with poly mount everything. Header bolts shake loose, even Loctite'd...snapped a bolt on the AC Compressor bracket...timing chain broke. It isn't fun. Poly's are rough but I couldn't imagine running solid metal in there. There are a reason people run poly uppers and solid rubber lowers...there is a little "give" to the drivetrain parts...same with a flex pipe in your exhaust system.

To add, an XP isn't near big enough of a cam to shake crap loose, so...I guess carry on.