Engine mount inserts ... don't !

[boxxster]

I have a powerflex engine mount insert in my other car right now. I thought the same thing when I installed it and went for a ride. Almost unbearable. Before you remove it, give a few days to settle in and the NVH will lessen.

[djw8282]

Originally Posted by boxxster

I have a powerflex engine mount insert in my other car right now. I thought the same thing when I installed it and went for a ride. Almost unbearable. Before you remove it, give a few days to settle in and the NVH will lessen.

Perfect post! I was looking for some feedback as I took my first drive with the Powerlex engine mount insert. I thought as you did. Unbearable! I was very close to ordering a stock 987 mount until I saw your post lol. The NVH seems to be coming from the front mount. Mind you, I have the Rennline transmission tuneable blue inserts as well. Has it smoothed out any further? I'm very curious about your findings. Thanks!

[10/10ths]

The OEM engine mounts are the only way to go.


Just think of them as a wear item that your replace regularly.

All of the aftermarket engine mounts that claim to “firm up shifting” et. al., are disastrous.

Even if you get a “slightly” firmer one, they ALL trigger the engine knock sensors and you will actually LOSE horsepower and torque. I have seen it on the dyno.

Just stay away from them all.

Good luck.

[djw8282]

Originally Posted by 10/10ths

The OEM engine mounts are the only way to go.


Just think of them as a wear item that your replace regularly.

All of the aftermarket engine mounts that claim to “firm up shifting” et. al., are disastrous.

Even if you get a “slightly” firmer one, they ALL trigger the engine knock sensors and you will actually LOSE horsepower and torque. I have seen it on the dyno.

Just stay away from them all.

Good luck.

Hey 10/10ths,

If a knock sensor is triggered will I get a code? How about semi-solid trans mount with the 987 engine mount?

[78F350]

Originally Posted by djw8282

Perfect post! I was looking for some feedback as I took my first drive with the Powerlex engine mount insert. I thought as you did. Unbearable! I was very close to ordering a stock 987 mount until I saw your post lol. The NVH seems to be coming from the front mount. Mind you, I have the Rennline transmission tuneable blue inserts as well. Has it smoothed out any further? I'm very curious about your findings. Thanks!

Powerflex has a series of engine mount products. I have the "Street Series" yellow bushing installed. It's not an 'insert', but replaces the entire bushing in the stock mount. I have no complaints in my '97 2.5L and will be putting it in my other cars as they need replacement.

[djw8282]

Originally Posted by 78F350

Powerflex has a series of engine mount products. I have the "Street Series" yellow bushing installed. It's not an 'insert', but replaces the entire bushing in the stock mount. I have no complaints in my '97 2.5L and will be putting it in my other cars as they need replacement.

That's the one I have. Did you feel it was less abrupt after awhile? Maybe because it was my first drive and the combination of my transmission mounts..

[maytag]

I filled the voids of an OEM mount (front mount) with urethane. I'm not sure I can tell a difference, really.
ymmv.

[78F350]

Originally Posted by djw8282

That's the one I have. Did you feel it was less abrupt after awhile? Maybe because it was my first drive and the combination of my transmission mounts..

I didn't notice any increased vibration as compared to a new 'Lemforder' replacement bushing that I've used in the past as a replacement. Most of the engine mounts that I've replaced have been done soon after purchasing a car and the old mounts were shot. That makes it hard to do a head to head comparison, but I'm quite satisfied with the Powerflex bushing.

Pics because I like to post pics...

[Radman]

Originally Posted by 78F350

I didn't notice any increased vibration as compared to a new 'Lemforder' replacement bushing that I've used in the past as a replacement. Most of the engine mounts that I've replaced have been done soon after purchasing a car and the old mounts were shot. That makes it hard to do a head to head comparison, but I'm quite satisfied with the Powerflex bushing.

Pics because I like to post pics...

Thanks for the feedback. Strongly considering the Powerflex bushing myself.

[10/10ths]

....you will just lose power.

The stiffer motor mounts trigger the knock sensors and the engine management will retard ignition timing to prevent what it thinks is detonation.

I’ve seen dyno tests to prove it.

I promise you that every Porsche out there with inserts or polyurethane bushings in their motor mounts now own slower cars.

So if you want more noise/vibration/harshness AND a slower car, by all means, send your hard earned money to the aftermarket purveyors who feast on all of the uninformed new Porsche owners who are now buying these old cars because they have depreciated to the point where they are cheaper than new Corollas.

You have been warned.

Just don’t do it.

Cheers.