Carl Fausett

Maybe its you who doesn't know what you are talking about my friend.

There are apparently two pins on Rogers mounts and that's why he has to get rid of the one that does not line up.

We don't have that issue, as there is only one pin on the mounts we sell, and it is in the right place.

Carl Fausett

As stated before: the benefits to solid aluminum motor mounts are:
1) lighter weight
2) better throttle response
3) easier access to the motor and more room for headers, turbos, etc.
4) unaffected by heat

Those are specific benefits that not everyone cares about - but they are important benefits to some.
Our solid aluminum mounts do deliver those benefits very well.

HOWEVER: if you do not need those benefits, we also offer a wonderful and affordable bolt-in rubber mount for your 928.

GregBBRD

How does an engine mount provide better throttle response?

Aspkiller

ENOUGH ALREADY - JUST BUY THIS PAIR OF NEW AFTERMARKET SOLID RUBBER MOUNTS FOR 928's AND SAVE YOURSELF A BUNCH OF MONEY. $100 FOR THE PAIR, PLUS SHIPPING. AND THEY ONLY HAVE ONE PIN EACH.

Wisconsin Joe

The mounts Roger sells are Volvo. They are a little bit taller (fraction of an inch) and they have the extra pin that needs to be removed. Roger does that, other places that sell them for the 928 may or may not (I don't know).

The Volvo mounts are an "adapted" part. Not specifically produced for the 928, but something that was found to work well.

At about 1/2 the price of yours. (about 1/3 the price of your solid metal ones).

And I won't say that the vibration from my collapsed MMs made the car "terrible" or "ruined", but there was a very noticeable improvement (reduction) when new ones went in.
Personally, I wouldn't install or recommend solid ones for a street car.

I'm going to guess that the "improved throttle response" from the engine not being able to rock back and forth is negligible.

ROG100

Those are the solid rubber mounts by Corteco for the Ford cars that we stopped selling years ago because of failures due to the change in manufacture. And if you look carefully they have two pins and one need removing.

Sold thousands of Volvo mounts Worldwide with a near perfect track record. Never had one fail yet. Great price and they are hydraulic like the original Porsche units for even better vibration attenuation.
$115 for the pair - does not get much better than that. We remove the extra pin and supply the correct mounting hardware.

ROG100

I have to agree with GB that the solid mounts MUST pass vibration from the engine to the chassis.

GregBBRD

I've had 3 people with GTS vehicles come into my shop, insisting that they needed an engine rebuild, because they had a terrible vibration and they were told it was an internal engine vibration. They decided that this was such a major expenditure that they wanted someone with a long track record of rebuilding 928 engines to do this job and came for me to rebuild their engines.

They actually had made appointments, with Mary, for me to rebuild their engines.

Needless to say, they were pretty happy when they found out all they needed was a set of motor mounts.....

That's pretty terrible, my book.



And yes, you are correct. Unless the motor mounts are so bad that the entire engine is revolving in the chassis, spinning the entire engine instead of the flywheel, the amount of power transfered to the transmssion in the rear is exactly the same....regardless of what mount is used and what condition it is in.

No change in throttle response is going to happen.

But it sounded good.....

Aspkiller

Thanks for the correction-Found them in a box marked 928 parts and made the fatal "assumption" mistake.
Larry

ALKada

I have run Roger's Volvo mounts for about five years now and have had zero issues and much smoother engine vibration than before. At the price they are very hard to beat for quality and great 928sRus support.

Nicole

I recently had the Volvo mounts installed in my car. The vibration I felt before is gone - now the engine feels "smooth as buttah"...

Strosek Ultra

I have a pair of Volvo 62438657 motor mounts I am going to install in my wife´s old Volvo 740 which is our winter wagon. Assume that is the mounts also being used for the 928, they seems to fit. Look exactly as on the pictures here https://rennlist.com/forums/928-foru...questions.html
Some installation tips.
http://dwaynesgarage.norcal928.org/MotorMounts.htm
https://rennlist.com/forums/928-foru...-pictures.html
Åke

Carl Fausett

Our customers also have had very good results with our after-market rubber mounts. We have had no failures. I do know some were buying their "Ford" after-market mounts from Rock Auto, and like a lot of things from Rock Auto, they are the low-price leader and the quality oftentimes matches the price. As I have said before, our mounts are of a higher quality and we have had no failures. But, we have to pay more for them in order to get the quality we want.

Carl Fausett

Some have assumed that because a failed hydraulic mount can cause a vibration felt by the driver - a solid aluminum mount would also cause the same vibration.

This is not so.

The failed hydraulic mount is not holding the engine still, it allows the engine to torque, jump up and smash down, which are the impact tremors that create the vibration. The solid mount holds the engine securely, so it can not jump up and down, and it cannot create the impact tremors. As a result, all the low frequency vibrations (impact tremors) are removed.

Greg asked why throttle response is improved with solid mounts. It is because the time necessary for drive-train windup is greatly reduced. Before the engine can move the vehicle (during both accel and decel) , the motor mounts must windup to their limit, the gear lash in the transmission must get all closed, the gear lash in the differential between the rack and pinion must close, and the CV joints change their angularity. And because it is a torque-tube car, the torque tube also winds up with energy. Once all these masses have been pre-loaded or their gaps closed, only THEN can the tires start to rotate.

The largest of these movements is the engine torquing on its mounts.

You may perform this experiment if you would like to see this with your own eyes. It's the process we sometimes use to confirm a broken motor mount. Open your hood, and put a friend in the car - manual or automatic. With the car in gear, accelerate the motor as you stay on the brakes. If a clutch car, you just have to slip the clutch for a moment.

You will see the engine torque (attempt to rotate) in the engine bay, and how much it lifts on the right (passenger) side. A solid mount stops this movement, so the energy can be transmitted to the wheels that much sooner.

Porsche introduced "Dynamic Motor Mounts" on its 911-series cars recently for this reason. During hard acceleration, the motor mount becomes solid for the optimum throttle response and quicker acceleration. I have no doubt that the "dynamic motor mount" technology will transfer into their other models as well in time. But for us - we can use a solid aluminum mount.

SeanR

Oh my. LOL.