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-   -   Let's Talk About Engine Mounts... (http://forums.pelicanparts.com/porsche-911-technical-forum/244067-lets-talk-about-engine-mounts.html)

rcecale 10-02-2005 06:18 PM

Let's Talk About Engine Mounts...
 
Looks like I'm in need of a new pair of engine mounts...

Had to raise the rear-end of my car earlier this evening to check the torque of my recently replaced rear axles. To jack it up, I place my floor jack under the exhaust cross-over flange and raise the rear-end enough to set my jack stands in place.

While I still had the weight of the engine on the jack, I was looking around the engine compartment and discovered this:

Driver's side:
http://forums.pelicanparts.com/uploa...1128302441.jpg

Passenger's side:
http://forums.pelicanparts.com/uploa...1128302482.jpg

Looking through Pelican's on-line catalog, I found there were a few different types of mounts to be purchased. What's the difference, besides price, of course, between the different mounts?

In a different thread, jpahemi gave a ringing endorsement for Wevo SS mounts. Rather than hijackk the other thread, I figured I would start a new one here.

Randy

randywebb 10-02-2005 07:09 PM

new thread = good

I can't tell if they are bad or not. What happens when you move the engine around?

Some have posted that the Wevo mounts transmit more NVH into the cabin. Are you racing the car?

Seen the thread on polycarbonate mounts?

Lukesportsman 10-02-2005 07:16 PM

Coupe : softest
Cab: slightly stiffer
Wevo: stiffer yet still some compliance
Solid: metal with no give

I would think that each step harder is going to increase NVH slightly. I didn't really notice the NVH of my solid mounts, but then again the 72 is not mild in most of its traits.

I would not use only two solid mounts. I likewise would be suspect of using only two WEVO's. I would think ideally you'd want to replace all four with WEVO's at the same time.

earlyapex 10-02-2005 07:17 PM

Randy, I've got the OEM sport mounts on my car. They work very well. I considered the WEVO mounts but concluded that I would not be getting a significant improvement with them over the sport mounts.

Elombard 10-02-2005 07:20 PM

Poly carbonate mounts? Gonna have to look for that. Thanks Randy.

I have the solid race mounts rear and sport mounts in the tranny. I did not notice more noise but my car is real loud. The Wevo mounts are the best if you have the change. I dont think you would be bothered by slightly more NVH, having read some of your posts in the past. If you want you can try my car and see what you think.

Try reving the motor and see how it moves around while you watch like Randy said. Rememer or have an assistant drive away (briskly) with the lid open while you watch and see if it moves much.

The least I would consider is also the cheapest - the sport mounts, a "safe" option.

rcecale 10-02-2005 07:21 PM

Hi Randy, thanks for checking in here.

I've been browsing through a few threads/discussions of engine mounts, trying to learn as much as I can.


In the pics above, the weight of the engine is setting on my jack, so perhaps why the gaps are there. They just don't seem right.

Haven't come across the thread you mentioned about polycarbonate mounts, but I did see those in the Pelican catalog. Are those basically just a replacement for the rubber in the stock mounts?

Randy

Elombard 10-02-2005 07:29 PM

Wow $90!!! for the poly carbonate mounts and they dont include the mount, just bushing material. That seems about 2x what they should cost.

randywebb 10-02-2005 07:31 PM

I think it will be a public service to consolidate all the info on this.

Sorry - I should have said polygraphite...

http://forums.pelicanparts.com/porsche-911-technical-forum/243245-experience-polygraphite-transmission-mounts.html

I put new stock mounts on my car ('73 with a carb'd 3.2L) for street use.

drums 10-02-2005 07:50 PM

My car has the G-50 tranny so I couldn't use the Wevo units there, but I could still use them on the engine. I replaced the rubber center clutch disc at the same time that I did the Wevo mounts. I notice more vibration but I think it is more a function of the turbo disc than the engine mounts. The way the Wevo mounts are designed, I wouldn't think there would be more vibration, just less engine movement and I don't notice any.
Drums

UK Carrera 10-02-2005 11:03 PM

Fitted some WEVO mounts at the weekend.

Overall I'm very pleased. There is more noise transmitted into the cabin, but I like it. Still quiet on part throttle.

Subjectively I think the gearchange is improved and there is a reduction in the shift ro drattle I experience sometimes when pulling away.

rcecale 10-18-2005 08:04 AM

As I mentioned above, this pic shows my passenger side engine mount. I have the rear end lifted, supported by the engine, so I think it's safe to assume this is the cause of the separation of the rubber from the metal part of the mount.

http://forums.pelicanparts.com/uploa...1128302482.jpg

When I removed the mount, it actually looks pretty decent. The rubber doesn't look all dried out or anything like that.

http://forums.pelicanparts.com/uploa...1129650796.jpg

I also noticed that the sleeve through the center of the rubber was beginning to rust, and also seemed to set a little crooked. Perhaps from being in a stationary position with the weight of the engine on it?

And then, there is the big engine mount bolt. WOW! This thing looks pretty nasty! I suppose it could be cleaned up, but I think I'd rather replace them with new ones.

http://forums.pelicanparts.com/uploa...1129650973.jpg http://forums.pelicanparts.com/uploa...1129650992.jpg

Lastly, when I removed the mount, I discovered that washer #4 in this pic was not installed. Could this have anything to do with the separation in the first pic above?

http://forums.pelicanparts.com/uploa...1129651442.jpg

Randy

safe 10-18-2005 08:48 AM

http://forums.pelicanparts.com/uploa...1128302482.jpg

I'm high jacking the tread a bit here...

My engine mounts has the large washers the other way around, the curving pointing up wards, if you understand what I mean.
Which is the correct way?

si Banker 10-18-2005 09:41 AM

engine mounts
 
I added the new Wevo mounts to my 1987 coupe and noticed a real increase in cabin noise and will most likely replace them with the stock mounts

wevoid 10-18-2005 10:21 AM

While there is no doubt the WEVO SS Engine mounts are capable of transmitting more noise as a result of the increased stiffness - another source of noise - regardless of engine mount design, or condition - is pre-load on the 4 points supporting the engine.

When installing any new engine mounts, the procedure covered in the workshop manuals should be performed to "stress-relieve" the 4 mount points.

This is achieved by slackening the torque on the 4 nuts and bolts - marked #10 and #12 on the illustration above. Then re-torquing in the new relaxed position.

We have had calls from customers who claimed their SS mounts are actually less noisy than stock. I assume this is because their stock mounts were operating in a pre-loaded condition.

Regards

Hayden

rcecale 10-18-2005 11:04 AM

Quote:

Originally posted by safe
[BI'm high jacking the tread a bit here...

My engine mounts has the large washers the other way around, the curving pointing up wards, if you understand what I mean.
Which is the correct way? [/B]
Magnus,

According to the pics I've seen, both in Wayne's "101 Projects" book, and elsewhere, the 'inside' of the curve should be wrapping itself around the mount rubber. You can see in my pis above that the rubber has a slight arc to it.

I'll let the experts say definitively, but I believe the washers DO get installed the way I have them in the pics.

Randy

KobaltBlau 10-18-2005 12:22 PM

Quote:

Originally posted by Lukesportsman
Coupe : softest
Cab: slightly stiffer

Proof of what I've always believed!!!!

Cabs ARE stiffer than Coupes!!!!

Rick Lee 10-18-2005 12:56 PM

I think I paid $79 for the blue solid billet mounts for my SC. A little noisier, but it's a track car. Shifting is a tad crisper too.

randywebb 10-18-2005 01:35 PM

there is an old thread on which direction the washers "should" face

IIRC, P AG changed their idea of which way to put them on - but that might have been for comfort only...


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