Question about cheap motor mounts

[mxfrank]

So I need motor mounts. I'm trying to convince myself that I really need to pay nearly 5 bills for Porsche mounts. I know everyone says the cheap ones don't last, but I have a very specific question: is it the right one or the left one or both that tend to collapse? I'm guessing it's the right, but I'd like to hear the stories.

[John_AZ]

Passenger side is ruined first due to the heat of the exhaust.

Check Clarks Garage for measurements---the drivers side may not need to be replaced but it is a good idea to do both. You will see used motor mounts offered that say "left-drivers side" for sale--good used.

Pelican has/had Corteco/Rein mounts a couple of days ago.
If true, these are great mounts.

Pelican Parts - Automotive Parts and Accessories - Porsche & BMW

If you search further, Gawernator has a source for OEM Porsche mounts he mentions often. About the same price as the Corteco/Rein.??

GL
J_AZ

[Gawernator]

Aha. I think you mean the Genuine Porsche mounts at a heavy discount from "Sonnen Porsche"

[John_AZ]

Yes, but can I trust the B&W print -- not actual picture of the mount or package?

Maybe their OEM Porsche mounts are made in N. Korea? JK.

J_AZ

[Gawernator]

They used to be but due to recent events production shifted to Cambodia.

[Jrboulder]

Originally Posted by Gawernator

They used to be but due to recent events production shifted to Cambodia.

They also used to make DME relays but it turns out they are using them in their rockets.

[Gawernator]

If only you knew how funny that is for me

[mxfrank]

Ok can we get this back on topic, please?

Corteco and Rein are not the same company. Corteco is part of the Freudenberg Group, a German outfit. Rein is part of CRP, which despite the (hopefully not eponymous) name is a spin off of Continental Rubber Company in the US. FWIW, I can't find Rein motor mounts anywhere, and they aren't listed for 944 in their application list.

If I could do a poll, I'd like to know how many have had problems specifically with the right mount. It's not just heat that kills it, since the engine spins clockwise, it's power is reacted through the block counterclockwise. That mount is getting beat over the head with 160 or more horsepower all the time.

That said, there's absolutely no reason that a solid rubber mount wouldn't work, but I would guess that it has to have a higher durometer than the pneumatic mount. That would make it less effective in damping vibration.

If heat turns out to be the main culprit, I think there's enough room in there for me to design an effective heat shield.

[alan6272]

I used cheaper mounts first time around did both, About 600 miles later I got hydraulic German made mounts and again did both. over 1,000 miles now and feels like new still. Bought mine from ********** out of Florida $109 ea.

[9FF]

...That mount is getting beat over the head with 160 or more horsepower all the time...

The mount is lucky to be getting 3-5hp, not an issue. If all the hp was going to the mount there would be nothing going to the wheels. Heat is the main enemy on the RH mount.

[Gawernator]

1986 PORSCHE 944 Parts - Porsche OEM Parts - Genuine Factory Parts Accessories - Wholesale

Genuine Porsche $165 including Porsche factory warranty

http://www.**********.com/ShowItem/175892%20Porsche%20Motor%20Mount%20-%20OEM%20Germany.aspx

"OEM Germany" $109

You're welcome

[Jrboulder]

If you want to get back on track I suggest you take the advice of the esteemed poster John_AZ and go measure your mounts. Of the two cars I've parted out and the 1 I did the mounts on the right is always worse than the left.

Once you discover that the right is bad and the average life of the Genuine Porsche mounts is 8-10 years you will realize that if you spend $165 now on one new mount you will most likely not own the car by the time it comes due again, regardless of whatever heat shield you come up with.

[John_AZ]

Originally Posted by mxfrank

Ok can we get this back on topic, please?

Corteco and Rein are not the same company. Corteco is part of the Freudenberg Group, a German outfit. Rein is part of CRP, which despite the (hopefully not eponymous) name is a spin off of Continental Rubber Company in the US. FWIW, I can't find Rein motor mounts anywhere, and they aren't listed for 944 in their application list.

If I could do a poll, I'd like to know how many have had problems specifically with the right mount. It's not just heat that kills it, since the engine spins clockwise, it's power is reacted through the block counterclockwise. That mount is getting beat over the head with 160 or more horsepower all the time.

That said, there's absolutely no reason that a solid rubber mount wouldn't work, but I would guess that it has to have a higher durometer than the pneumatic mount. That would make it less effective in damping vibration.

If heat turns out to be the main culprit, I think there's enough room in there for me to design an effective heat shield.

mxfrank,

I use the Corteco/Rein name because both are under the corporate banner of CRP Automotive.
CRP Automotive

If you search for a part on Rein web site you are redirected to the CRP site.
Rein

It appears Corteco is now the manufacturer of motormounts for CRP.

Heat is the main enemy of the motor mounts and Porsche has had a couple of TSBs. One is for the belly pan and the direction of the bottom ducts and the use of 4mm washers to increase air flow:



The WSM has a specific measurement for "good" MMs removed from the car.



GL
J_AZ

[CHICKS]

So I assume the issue with the belly pan was fixed on the later cars with the plastic pans?

[mxfrank]

FWIW, I e-mailed URO/APA to get some input from them. Here's what they had to say:

the mount we are offering is hydraulic mount like the OE /
genuine mount.

There are several other versions of this mount on the market as you
mentioned some of them being solid rubber.

The primary reason for the use of hydraulic mounts is to reduce NVH (noise,
vibration, and harshness) and was not done specifically to improve
durability.

The OEM / genuine Porsche mounts certainly had their share of difficulties
over the years, as witnessed by the different versions on this that have
come and gone.

We are following the latest factory design and materials specifications on
our mount and expect it to perform as well, but for less cost. That said we
have sold thousands of these mounts with a near zero warranty rate over the
past 4 years.

I've been running Uro mounts in my Mercedes for some time, with nary a millimeter of height loss. I'm going to give these a try in the 944, but with some modifications. I'll report back in a year or so and tell you how it turned out.

@9ff: the full engine output is reacted by the mount. Spinning the crankshaft clockwise has to produce an equal counterclockwise effect somewhere. The mount is where Newton happens.

[djnolan]

Originally Posted by mxfrank

FWIW, I e-mailed URO/APA to get some input from them.

Is there a web link? I may go for a right mount only to reduce noise...

[mxfrank]

Originally Posted by djnolan

Is there a web link? I may go for a right mount only to reduce noise...

Uro is sold right here at Pelican.

[djnolan]

Cheap at that. The real question is this a repair I should attempt w/o a lift? Do you really have to remove the sway bar and the crossmember (per Clarkes) to replace one mount?

[9FF]

From all the past discussion over on RL, this is the consensus on MM's:

Junk=URO, Deutsche Parts, Hamburg Technic
Will last barely a year before they are out of spec/collapse.

Mid range=Meyle
People have reported them to still be in spec after 2+ years

Good Quality = Rein
As good as Porsche Branded from dealer. Alternative OEM supplier but now NLA unless NOS.

Top of the line=Porsche OEM from dealer
2yr Porsche warranty, generally last 4-5 years.

[mxfrank]

Originally Posted by 9FF

From all the past discussion over on RL, this is the consensus on MM's:

Junk=URO, Deutsche Parts, Hamburg Technic
Will last barely a year before they are out of spec/collapse.

Mid range=Meyle
People have reported them to still be in spec after 2+ years

Good Quality = Rein
As good as Porsche Branded from dealer. Alternative OEM supplier but now NLA unless NOS.

Top of the line=Porsche OEM from dealer
2yr Porsche warranty, generally last 4-5 years.

And what of Corteco (which is not related to Rein or CRP, as far as I can determine)?

I can find these comments all over the place, what I can't find is a reason to believe that all of these vendors can keep making bad parts and stay in business. FWIW, my experience with URO parts directly contradicts most of what I read about them. In any event, I'm going to manufacture a heat shield that will protect the mount effectively.