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From my experience, with modified cars in general, I've been noticing more and more that polyurethane doesn't have good longevity.
I would either get new rubber bushings or go with delrin or solid
From my experience, with modified cars in general, I've been noticing more and more that polyurethane doesn't have good longevity.
I would either get new rubber bushings or go with delrin or solid
I've been interested in the polyurethane mounts, but I've not heard much about them. So far, it seems like stock rubber mounts have the best of both worlds... Durability without too much vibration.
When I bought my mounts I did some research and found that the factory mount material absorbs both compression and tension. Though it looks like a puck with a bolt going through it like the rest; both bolts are bonded to their own plates in the center of the mount material, with rubber between them so it can compress and expand to absorb, well, both compression and tension.
most of the "puck" style mounts that you get now, including the ones I purchased, are basically a puck of poly/steel/rubber/derlin absorbing compression forces while the bolt running through it absorbs tension, which under certain circumstances gives vibration/load a solid path to the subframe.
There have been comments of the bolt breaking though I've yet to have any experience with this in terms of my car or others, nor have I seen pictures of this.
(sorry since this is an informative thread I thought I'd shed some light as to how they work comparatively.)
As to the AWR mounts; yes they're 200 bucks.
AWR offers the only aftermarket mount(not stock/mazda comp) where all of the forces are absorbed by the polyurethane bushing versus the both the mount/bolt. And since their mount has more engineering around the problem than what is essentially a hockey puck with a hole drilled through it has, they charge more for their solution to the problem.
That being said: I have a set of Level Zero Motorsport's 95 Durometer Hardness Polyurethane Engine and Transmission mounts; now that they've broken in they are pretty comfortable, they transmit a little vibration, nothing really bad, still really stiff. I am happy with my purchase, I'm in my twenties, and my car is a daily driven turbo convertible.
I made delrin mounts in my machine shop class. When I went to go buy hardware, the people at the hardware store recommended grade 5 bolts because they don't snap. They'll bend before they snap. Those guys do a lot of top speed cars in the salt flats
Why would Mazda make the vert engine mounts stiffer?
Because the whole chassis was radically modified to make it stiffer. There is an extra front subframe brace behind the oil pan, the firewall is stronger, the a-pillars are stronger, the floor pan is thicker, the area behind the seats is reinforced, the frame rails are thicker, the top has a built-in roll bar, there is a built-in rear strut bar in the form of the wall separating the trunk and passenger area, and the sway bars were larger than in the NA coupes.
My guess is that they went with stiffer engine mounts to help keep the drivetrain weight from shifting during hard cornering.
J9FD3S mentioned the difference above, and I've read it in a few places. I think there is a thread or two that Icemark may have posted in.
i went from stock/torque brace to AWR to solid on a cosmo swap. the awr have a sleeve of polyurethane, enough to tone down the vibrations, but not enough for it to flex. its brilliant. welds are great, great metal, zinc coating. totally worth it. im late, im late!
Stock vert engine mounts are different than stock coupe mounts?
Yes. Sotck vert mounts (FB67-39-040A) are a different part number than coupe mounts (FB01-39-040A). Stock N/A and T-2 coupe mounts are the same. I will take RR88's word for it that the vert mounts are stiffer than the coupe mounts (ditto for trans mounts).
i went from stock/torque brace to AWR to solid on a cosmo swap. the awr have a sleeve of polyurethane, enough to tone down the vibrations, but not enough for it to flex. its brilliant. welds are great, great metal, zinc coating. totally worth it. im late, im late!
Reviving an old thread but I couldn't find any recent information in the past year.
I went along and ordered from Himni Racing. I ordered the FC Polyurethane 2A Street Motor and PolyurethaneTranny Mounts. I was a tad hesitant with the mixed reviews due to communication and delivery issues others had explained. I emailed them regarding their inventory and they responded to my email within 24hrs. The parts got delivered quickly. A few other emails were a little slower but that mainly due to the COVID-19 short staffing. Products look sturdy and well made. Based on personal preference the only thing I'm not crazy about were the the allen head bolts for the motor. Something I can easily switch out.
02-26-12, 10:43 PM
