SBF Motor Mounts

TonyMadrid · #1 (**permalink**) 06-06-2005, 02:04 PM

I know that the topic of motor mounts has come up numerous times in here. However, I wanted to share some information with everyone.

I am running a 351W in an A&C Cobra and I have been using stock replacement stamped mounts that I got from Autozone. I am not too hard on the accelerator and now the car has a little over 3,500 miles on it. Yesterday, I had the car up on a jack to drain the oil and I noticed that one of the motor mounts seemed to have a split in the rubber. On closer inspection, it was clear that the rubber had started to split. This was only on one of the mounts, apparently the torque side of the engine.

I just ordered Prothane mounts from Summit. A little pricey at $96.00 but I'm sure they will be far superior to the over the counter stock replacements. I had checked with Energy Suspension and they advised that they don't make a mount that I could use without modifying the chassis bracket where the mount attaches to. The prothane mounts are made with a protective plate to prevent the mount from separating.

If you are interested in the Prothane mounts, the Summit number is PTP-6-503

The main thrust of this post is not to just share what happened to me, but more so to pass along some important advice. How often do we even look at or check our motor mounts? Probably hardly at all. I think it's a good idea to get under your cars and inspect your mounts periodically, especially if you are using the stamped stock replacement mounts.

Tony

P.S. If you don't want to invest in the better mounts you can always drill through the stock mounts and insert a bolt/washer/nut setup to prevent the mount from separating under high torque situations; or you can fabricate torque limiting straps beteween the engine and the frame.

sllib · #2 (**permalink**) 06-07-2005, 07:01 AM

Thanks, Tony. I'm not at the "motor mount buying stage" yet, and I had planned to drill and bolt stock mounts, but the number is good to have.
Bill Stradtner

Mr.Fixit · #3 (**permalink**) 06-23-2005, 11:05 AM

Running an aluminum flywheel really makes it easier on the rubber motor mounts, more than you would think.

jerry w · #4 (**permalink**) 06-23-2005, 06:35 PM

Tony,

nice to see you are still around! Are you going to Lake George in July? I am 3/4 done with my build, so I will be a spectator again.
Hey where did you get your bezels for around your roll bar, I am having no luck in finding the correct fitting diameters?

Best regards,

and thanks for the heads up on the motor mounts.

Jer

sllib · #5 (**permalink**) 06-25-2005, 08:16 AM

Would Prothane motor mounts AND an aluminum flywheel be overkill?
Bill Stradtner

strictlypersonl · #6 (**permalink**) 06-25-2005, 11:21 AM

If you have a drill press, here's a Three Dollar Fix.

Ant · #7 (**permalink**) 06-26-2005, 03:49 AM

strictlypersonl,

I like your Three Dollar Fix with the rubber mounts.
I suppose there is nothing really to be gained by fitting a polyurethane transmission mount, as the motor mounts will be more stable, and OEM rubber mount will do!

I am considering fitting a rubber or poly bushed arm up near the back/top of the bellhousing/engine to the chassis to stabilise the engine