SbcRX007

I got my polyurethane from polyurethane products company, out of CA. Used 90A durometer, as that is what's generally used for motor mount applications.

SbcRX007

3" dia x 1-5/16" 90A Polyurethane. Trued on a lathe, drilled 3/8" thru hole in the center. Endplates are 1/8" mild steel. Used grade 8 bolts, washers, lock washers, I believe the bolt was in the neighborhood of 2.5" long, but don't quote me, just measure yourself =)

any questions, ask away.

jesse

aussiesmg

iTrader: (1)

I'm going to use delrin for this, harder and longer lasting than poly but a little less vibration than aluminum.

elwood

iTrader: (1)

It looks like all the aftermarket "upgrades" with urethane or hard rubber (hockey puck, etc.)use a single bolt that runs all the way through the mount. This sort of design will provide isolation only in compression -- in rebound it's shorted out by the bolt. Another concern is bolting through the urethane or rubber and expecting this soft joint to maintain clamp load. If you're gonna do this, I would recommend using a castle nut and cotter pin -- or at least a prevailing torque nut (nyloc or "jet nut").

If I remember correctly, the OEM mount is a totally isolated sandwich design that maintains isolation in compression and rebound. This is why it has studs at both ends. This seems to be a much better design. Does anybody know of a urethane mount that mimics the OEM design?

Jeff20B

iTrader: (13)

I like the competition motor mounts from Racing Beat.

Zyrano

I'm confused, you guys do know that mazdacomp and racing beat sell a stiffer mount right? I have them, works fine, as far as the height, they are the same because the are the same part number...

You can even get a matching tranny mount.

Alvin

glosoli

How bad do the solid mounts vibrate in idle?
Anyone have any feedback on this?

elwood

iTrader: (1)

Thanks for the lead. Since my team support number has expired at Mazda Motorsports, can you tell me how much their mounts are? I see the RB ones are $45 each. Is the construction the same?

Jeff20B

iTrader: (13)

RB ones fit and look like stock. The construction is the same. I swapped a couple sets in some 1st gens a couple months ago. They make a noticeable difference.

Re-Speed.com

iTrader: (3)

We are currently testing prototype mounts. Hope to have them available in a month. Our design is like stock where there are two apposing studs that are not joined inside the mount, for exactly the reasons you posted. I would have the say the mazda comp mounts are done this way as well.

-billy

Zyrano

Just checked, mazda comp is 42 dollars each. I just got confused by the long thread when this stuff is already availabe. P.S. I think the racing beat/mazdatrix/mazdacomp mounts are all from the same source.

Alvin