Speed Source Polyurethane Engine Mounts, Which are compatible? Options

[Syaoran]

http://speed-source.net/?wpsc-product=toyota-engine-mounts

They don't seem to have an application specific to our generation. Being the kind of bushing it is I'm thinking there should be one compatible, like perhaps the MR2 NA ones. Anybody know?

[BonzaiCelica]

all MR2 NA from 91-96 come with s54 transmission same as our cars. So it should fit just fine

[Tigawoods]

im a bit confused as to the difference between these and Kirks inserts. How would these mount?
Does the S54 on the MR2 NA have the same mount points as us?

[Batman722]

im a bit confused as to the difference between these and Kirks inserts. How would these mount?
Does the S54 on the MR2 NA have the same mount points as us?

The speed source mounts completely replace the rubber bushing of the stock mount, like the poly a-arm bushings some people have done.
The kirk inserts work in addition to the stock rubber of the mounts.

[BonzaiCelica]

im a bit confused as to the difference between these and Kirks inserts. How would these mount?
Does the S54 on the MR2 NA have the same mount points as us?

The speed source mounts completely replace the rubber bushing of the stock mount, like the poly a-arm bushings some people have done.
The kirk inserts work in addition to the stock rubber of the mounts.

oh yea what he said^

[Tigawoods]

I would asume the speed source ones, since all Poly-U would be "better" than the inserts yeah?

[Syaoran]

The kirkosaurus ones work in unison with the stock ones, which means the effective stiffness of the mount in final form is less than the stiffness of the inserts.

A 75A insert along with the rubber mounts could give you a final mount stiffness of, say, 60A.

These inserts are 75A . The way they work is as was mentioned before, these replace the whole mount. So you'd have to press / hammer out the old bushing and press in the new one. The bushing is a complete bushing, so it leaves VERY little room for movement (almost unnoticeable) at the cost of increase NVH over the inserts. The inserts only work best if the mounts are still in good condition.

Getting new mounts + inserts is more expensive than getting these Speed Source poly mounts, so I'm trying to get these instead.

@BonzaiCelica: I was thinking about that, but that doesn't necessarily mean that the bushings on the mounts are the same. That's why I ask. My worry is that they're too small. If the bushings are bigger than the mount, I can just cut them down to size. Guess I'll probably have to bite the bullet and find out if they don't answer my email.

This post has been edited by Syaoran: Oct 24, 2012 - 7:48 PM

[Batman722]

Better, yes and no. Just like the kirks you'll get a lot of vibration until they break in but IMO these will vibrate more because there is no soft rubber to absorb anything. And in that regard they'll hold the motor in place a little better with very little movement.

Easier to install, yes and no. Either way you have to remove the mounts, with the kirks, just add, with SS you have to cut/remove all the rubber and ring. Both stick out past the mount so putting them in isn't bad but not as simple as without.

I've have kirks and like them. Stiffer than stock and work.
I've installed the SS on someone else's mounts (MR2 w/3rd gen swap) and I don't know first hand how they are compared.

[Syaoran]

Better, yes and no. Just like the kirks you'll get a lot of vibration until they break in but IMO these will vibrate more because there is no soft rubber to absorb anything. And in that regard they'll hold the motor in place a little better with very little movement.

Easier to install, yes and no. Either way you have to remove the mounts, with the kirks, just add, with SS you have to cut/remove all the rubber and ring. Both stick out past the mount so putting them in isn't bad but not as simple as without.

I've have kirks and like them. Stiffer than stock and work.
I've installed the SS on someone else's mounts (MR2 w/3rd gen swap) and I don't know first hand how they are compared.

As I stated before the kirk mounts are softer than the full poly mounts. It's better for comfort that way, but not as good for performance. In a FWD application it's much more vital to keep the wheels on the ground, which means as little engine movement as possible. However there's a threshold to how much NVH each individual can stand. I installed the kirk front and rear in my previous Celica, and it was just fine for me, but there was room for improvement since the engine moved anyways, just not as much as before. However everything rattled much more than before, and compared to the performance I felt it wasn't worth it.

This time I think I'm trying the full poly inserts and see how it goes. MR2 is different from the Celica and the NVH transmission isn't the same as the chassis isn't the same. The Celica's cabin is a bit more insulated from the engine than the MR2's, and that makes a difference (I've driven MR2s with Kirk inserts and it was much worse than my 5G with kirk inserts. Both were 5SFE)

[Tigawoods]

damn this thread. now I am considering these. I doubt I will relive that initial shock from stock -> kirks. Plus the break in they have had. I dont see full poly being anything substantially more stiff than the inserts. Not to the point of unbearability I would think.

keep me posted on what you end up getting. Id like to grab some within the next few days.

[Syaoran]

I'm still trying to get a confirmation from a vendor to see if the MK2 MR-2 mount bushings will fit in ours. Just contacted TwosRUs... should get a reply in the next day. I'll let you know.

Got a reply from David @ TwosRUs:

"I have no idea and my gut says no. Sorry.

David
twosrus.com"

The only way to find out is to measure the mount diameter in an MR-2. I have a feeling they're going to be the same, but I don't have anything to measure with right now.

This post has been edited by Syaoran: Oct 25, 2012 - 9:23 AM

[Tigawoods]

I had somewhat expected slight vague responses.

Ill measure tonight (if we dont already have the numbers on here) our front and rear mounts, and I suppose I could throw up a post on a couple MR2 boards to see what they come up with. Im hoping to get them within the next few days if this all works out


EDIT**
Why not have him measure his PolyU Mounts he has there for the MR2 and we can measure the diameters of our mounts


Reading around I keep seeing 73mm for NA.

This post has been edited by Tigawoods: Oct 26, 2012 - 9:11 AM

[Syaoran]

I'll go ahead and ask on the MR2 forums. If you could measure ours, I'll mail TwosRUs to see if they can measure theirs to compare.

[Tigawoods]

I'll measure them tonight, when im back home

[Syaoran]

Awesome, thanks.

[Tigawoods]

I forgot my fine measure ruler at my apartment so I used a regular contractor tape measure.
Not as accurate but I got 3" (76mm or so) for both front and rear. Thats measuring from the outer metal case ring inside of the mount

[Syaoran]

I forgot my fine measure ruler at my apartment so I used a regular contractor tape measure.
Not as accurate but I got 3" (76mm or so) for both front and rear. Thats measuring from the outer metal case ring inside of the mount

There's 3 sizes apparently for the MR2 front mount. The rear seems to be the same for all engines in the MR2.


Front:
http://www.tuningdevelopments.co.uk/produc...products_id=371

Rear:
http://www.tuningdevelopments.co.uk/produc...products_id=370

Going to keep searching

EDIT: In any case if none of the work (which I doubt sincerely), there's these:

http://www.gt4-racing.eu/index.php/toyota-...gine-mount-rear

This post has been edited by Syaoran: Oct 27, 2012 - 12:44 PM

[Takumi-FujiWaraS...]

If the mounts rubber isn't completely ruined/cracked you could always polly fill them. I've used polly filled mounts with great results on past projects.

[Syaoran]

My rear mount is completely gone, sadly. I'd have to buy a new one which is starting to look like the more feasible option right now. Still haven't been able to find the MR2 measurement.

[Tigawoods]

Im not really sure they will fit

here is another link I found with a few numbers

http://www.mr2oc.co.uk/know-your-2-knowled...amp;kbartid=160