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Old 06/09/2011, 10:04 AM   #1 (permalink)
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Using polyurethane inserts vs oem motor mounts

Anybody have any experience using prothane brand inserts?

My mechanic said I would be wasting my time and the vibration would be horrific and the inserts would only last a few months. That was his experience dealing with inserts. Not specifically these I don't think. He said the ones he dealt with were made in India.

The cost differential is huge... 43 bucks for the entire set of inserts vs nearly 300 for oem mounts.

Thoughts?
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Old 06/09/2011, 10:07 AM   #2 (permalink)
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Thoughts?
I think your mechanic is a moron. Poly mounts will outlast stock. There will be a slight vibration increase at idle, but it is more noticeable on the V6.
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Old 06/09/2011, 10:10 AM   #3 (permalink)
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Yes and also keep in mind these are polyurethane inserts, not complete mounts. You will need to press the rubber out of the old mounts to install them. The new oem mounts come with the bracket and everything to bolt it up. That is why they are more expensive.
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Old 06/09/2011, 10:49 AM   #4 (permalink)
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Your mechanic is probably thinking of different parts that were meant for a cheap/quick fix... besides doesn't Prothane have a lifetime warranty on defects?

Although (I haven't used these) I do wonder how much/if any extra vibration there would be. Enough to cause other parts to fail? Or barely noticable?

[edit] Through some random searches, it seems poly mounts can cause the dashboard to crack?! Here's one message: Am I the only one with a cracked dash? ?

Last edited by HRT; 06/09/2011 at 01:18 PM.
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Old 06/09/2011, 04:12 PM   #5 (permalink)
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Quote:
Originally Posted by Centurin View Post
I think your mechanic is a moron. Poly mounts will outlast stock. There will be a slight vibration increase at idle, but it is more noticeable on the V6.

The guys with the GS and RS 4's are the ones complaining of vibration with the Polyurethane inserts...


But in my experience if you have a smooth idle as experienced from the engine bay (not the cabin with stock mounts) you will still have a tolerable idle in the cabin with The Prothain brand mounts provided you install them properly but be forewarned most of the 4's don't idle smoothly.
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Old 06/09/2011, 05:05 PM   #6 (permalink)
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If you have an auto, just don't install the rear mount. Fix all cracks in the dash before you install them too. Otherwise, install them and enjoy.
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Old 06/09/2011, 05:16 PM   #7 (permalink)
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If you have an auto, just don't install the rear mount. Fix all cracks in the dash before you install them too. Otherwise, install them and enjoy.
Does this go for the v6 auto too?

Just make sure you sleeve them tight
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Old 06/09/2011, 06:14 PM   #8 (permalink)
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Does this go for the v6 auto too?

Just make sure you sleeve them tight

I don't believe so. V6's tend to have less noticeable idle vibration. To be safe you could always not install the rear.
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Old 06/10/2011, 08:48 AM   #9 (permalink)
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Quote:
Originally Posted by WorldWind View Post
The guys with the GS and RS 4's are the ones complaining of vibration with the Polyurethane inserts...


But in my experience if you have a smooth idle as experienced from the engine bay (not the cabin with stock mounts) you will still have a tolerable idle in the cabin with The Prothain brand mounts provided you install them properly but be forewarned most of the 4's don't idle smoothly.
I have a GS 4 cylinder.

I just got a replacement engine with 66 k miles that idles sweet at roughly 625 or so. Not sure what constitutes a "smooth" idle but I would say this is the best my engine has sounded since it was first purchased.
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Old 06/10/2011, 08:53 AM   #10 (permalink)
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2 of the mounts cost under 35 bucks. So I am thinking of getting those through Mitsubishi. The other 2 run at or above 100. My mechanic said I can ride out the rear one (the most expensive one) but the one near the overflow tank needs to be replaced and that one is 97 bucks.
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Old 06/10/2011, 10:30 AM   #11 (permalink)
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Found a dealership in NC with the website oediscountparts.com that is about 30 percent less.

Front and Rear are going for only $25 each and the one near the timing belt is only $72 and approximately only $10 to ship (vs the same amount I would have had to pay in taxes locally through my dealership.
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Old 06/10/2011, 12:55 PM   #12 (permalink)
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Poly mount on the front, OEM mounts for the other three. This set-up completely gets rid of the wheel hop on hard starts and the increase in vibration is barely noticeable. I loved my car after I set it up that way. AGX KYB suspension and some slightly wider wheels (O-Z Racing Ultraleggera) made it even better. I still wonder sometimes why I got rid of the Eclipse. It was comfortable as all hell compared to my 350Z, but then, I'm just another fat lazy American.

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Old 06/10/2011, 01:06 PM   #13 (permalink)
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i did 3, not the rear and my motor doesn't move at all and there is no vibration at all. only when shifting it can be a little hard but properly synched shifts help with that
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Old 06/10/2011, 04:17 PM   #14 (permalink)
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6G74 using all 4 prothanes, no issues.
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Old 06/10/2011, 06:23 PM   #15 (permalink)
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have em in my gs-t, although i only used prothane on all but the rear.. i have no issues or complaints..
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Old 06/10/2011, 08:40 PM   #16 (permalink)
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I have prothanes all the way around on my GT manual. I did slam it in 2nd at 45 though and didn't give it any gas so there's a slight squeak in mine, but Summit Racing (where i ordered my set from) replaces them at no cost to me (other than shipping). Lifetime Warranty ftw.
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Old 06/15/2011, 10:10 AM   #17 (permalink)
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Quote:
Originally Posted by WorldWind View Post
The guys with the GS and RS 4's are the ones complaining of vibration with the Polyurethane inserts...

But in my experience if you have a smooth idle as experienced from the engine bay (not the cabin with stock mounts) you will still have a tolerable idle in the cabin with The Prothain brand mounts provided you install them properly but be forewarned most of the 4's don't idle smoothly.
Do you think the guys that had their dash's crack after putting in all poly mounts might be all 4cyls?


Quote:
Originally Posted by zakmartin View Post
Poly mount on the front, OEM mounts for the other three. This set-up completely gets rid of the wheel hop on hard starts and the increase in vibration is barely noticeable. I loved my car after I set it up that way.
Thanks for that info, I was thinking about doing the same thing on my v6 but didn't know if it would over-stress the front mount's brackets/bolts (especially since its an aluminum bracket). And of course I never thought about the dash cracking until I did a search. If my new front oem/rubber mount tears (and from its poor design, it certainly will) I'll put the poly one in its place.
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Old 06/18/2011, 02:10 PM   #18 (permalink)
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I'm just curious if there are other options besides the OEM or Prothane inserts?

I don't think I would want to deal with the harshness of the inserts (my car is a daily driver), but would want something that might be better and more reliable than the OEM mounts.

I noticed Beck Arnley makes mounts for our cars. How do these compare to the OEM as far as reliability?
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Old 06/18/2011, 10:50 PM   #19 (permalink)
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I would say do prothane. I also have an 03 GT, 5 spd, and I replaced all my mounts with OEM replacements and its helped the shaking and shuddering and made it much smoother, But its still sometimes shakey and I can hear the engine shift around, as I can see the front OEM replacement is already looking fairly worn, and Im now going to switch to prothane for the front and passenger mounts. Wish I would have gotten them prothane in the first place. And as far as I know the beck arnley are oem comparable, they are not an upgrade from stock.
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Old 06/19/2011, 07:10 AM   #20 (permalink)
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Quote:
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I don't think I would want to deal with the harshness of the inserts (my car is a daily driver), but would want something that might be better and more reliable than the OEM mounts.
Like 3Gspeed said, the Beck Arnley's are OEM design. The OEM design is the problem here- for your GT, on the front mount (by V6 timing cover), it's not a bolt going through a solid circle of rubber. OEM only has rubber at the top- the center bolt "hangs down" through the top half of rubber. The bottom half of rubber = isn't there (never was from OEM). So that center bolt is free to flex down (and back up)- and eventually tears. You should be able to find a picture at rockauto.com or on other store/parts websites. The Prothane insert replacement is a solid circle (of poly) that will fix the tearing problem.

(edit: A solid circle of rubber would also fix the tearing problem on the GT/v6 front mount- but you would have to find another car with the same size insert, press it out, press it into the Eclipse mount, lots of research for that one b/c as far as I've seen, nobody's done it...)

Last edited by HRT; 06/19/2011 at 07:14 AM.
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Old 06/19/2011, 08:57 AM   #21 (permalink)
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you could fill the rest of the oem insert with some windo-weld.

http://tech.mirage-performance.com/enginemounts.html

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