merchauser

certainly a valid point, but how does this translate regarding feel and function?

in the process of replacing my original collapsed mounts with the volvo ones (price) with no consideration of the OEMs (again, price). it appears a lot of happy installations

Bigfoot928

I personally wish these were still available. I need something on the stiffer side but not quite solid. I also need the ability to have different heights.

Mrmerlin

FWIW i have installed 3 sets of these mounts and they all do the same thing,
as far as vibration and ride height is concerned,
their is noticeable vibration transmitted to the chassis.

Its not obtrusive, but is not silky smooth like the factory mounts are.

The engine does rock a little bit when the throttle is moved but not as much as it did when the Volvo mounts were used.

I think in all the time of working on these cars I have only installed 1 set of factory motor mounts and they failed after 2 years .

Every other MM job has been to swap in Volvo mounts or the older Rock auto Ranger mounts, and the three sets of Hans mounts.

BTW these Hans mounts are some of the finest pieces of art that you will never see installed on the car.

GregBBRD

I don't bother arguing motor mounts, anymore. Cheap trumps function with 98% of the people here. The steering wheel could shake off the column and no one would acknowledge that there was a problem....as long as it was cheap!

Even talking about what happens to the CG when the entire engine mass is raised 3/4 of an inch is a waste of good air....

That being said, in my shop, I take quite a few sets out and install the proper mounts, for the people that complain about the decreased smoothness of the entire car.

I call something made for a completely different car, with a completely different engine design, weight, and harmonics "job security."

Bigfoot928

I want to get min as low to the cross member as possible without having contact. I don't know what height I need because I have the pan spacer.

GregBBRD

Right?

"These Volvo mounts will only raise the engine 3/4 of an inch" makes zero sense, to me.

Mark Anderson went to great effort to lower his engine down into the chassis as far as possible....to the point of modifying the front cross member. This lowered the CG!


928 engines have an inherent vibration/frequency right about 1200rpms and then again in the 2200-2500rpm range. First harmonic, second harmonic stuff. No amount of balancing of the engine components will take this away....it can be felt in every car.

We literally took out a set of Volvo mounts, today, which made the engine shake so bad (in the second rpm range), that driving the car was actually awful. Right smack dab in the rpm range where the car spends 50% of its' time.

Porsche mounts installed...100% better!

Night versus day stuff!

Porsche mounts are made to absorb the specific vibrations/harmonics/frequencies that the 928 engine produces....

It's a 928, not a fricking Volvo!





Just because it fits, doesn't mean you should use it!

SwayBar

Somebody sell me your Hans motor mounts you're not using!

GregBBRD

I think Hans' mounts are the best thing ever dreamed up or made, for a dedicated track car.....or any 928 that is driven in any track event.

I hope he reconsiders and makes more.

I will have "homes" for more.

Right now, I've got a brand new set, on the shelf, if you really need them.

Bigfoot928

I'm actually doing it for another reason. I need as much room as possible for my ITB airbox. Lowered CG would pretty much be a waste on my 928. I need the right balance between more room for the airbox but not too low to cause the engine susceptible to hitting stuff.

Mrmerlin

with the Hans mounts you can change the loaded height so SG these would work for you
In addition to swapping motor mounts dont forget that the trans mounts are usually crushed down,
new trans mounts will also be an improvement to the drive line.

Bigfoot928

merchauser

well, that is certainly a solid endorsement!

I am willing to spend up for the better product, but seems there are many owners that have installed the volvo mounts with great results?

with the cost of OEMs north of $550. and the volvo less than $120. can someone tell me I am going to get 4.5X more function or performance from OEM?
additionally, do the OEMs have a propensity for failure?

hacker-pschorr

That's an impossible question to answer that specifically. The point Greg was making is these cars we designed to be one of the most glass smooth GT cars of all time, and they succeeded. Anything that disrupts this smoothness by even 1% is not acceptable to someone like Greg and many others in the 928 world.

Greg's other point is there are still many more people who will accept even a 50% - 75% increase in NVH to save a few hundred bucks.

What does 50% - 75% even mean? I have no idea, they are arbitrary numbers since none of us own the very sophisticated OEM testing equipment to post up real nerd data on such things.

Point is, to someone like Greg and many others, why own such a car just to make anything worse, especially when the original parts are available?

It's a slippery slope of cutting corners.

That depends, does your car have the belly pan with the cooling ducts for the motor mounts? If yes, they will most likely last longer than you own the car.

Chris Lockhart

Sterling, take a look at some of the late model Cadillac LS motor mounts. Specifically the aftermarket units. They have some that look very similar to Hans' and I think you can adjust height via the thickness of the rubber/polyurethane.

Adamant1971

I can tell you that my 87 has Volvo mounts and I have never been happy with them, specifically the vibration in the steering wheel. This winter I'm going back to OEM.

My take on this is that a majority of people that are using the Volvo mounts most likely had collapsed OEM mounts, so those people probably never had a smooth driving 928 in the first place. Anything is an improvement if your OEM mounts are collapsed. In my case my original mounts were ok, I changed them since I was doing the OPG. Immediately I noticed a slight vibration in the steering wheel, nothing major, just not as smooth as it was.

If I was building a 928 to be more of a sports car than a GT car, the mounts from Hans would be the ticket. Plus they are gorgeous.