Thread: Solid Rear motor mount

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2012-02-03 00:36:40

#51

Kyle

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Originally Posted by Will

We need to find out the exact material properties of the JWT/NISMO mounts. They have the perfect balance. From an engineering perspective, the shock stress on the gearbox and diff greatly increase with an extremely rigid rear mount. This is really only an issue for the turbo guys. I feel that the JWT/NISMO mounts protect the transmission while providing enough rigidity and control.

If I can get my hands on some JWT/NISMO mounts, I can do some basic testing and use the data to figure out exactly the range we are looking for and what material we can use to make these. Wether a forum member makes them or a a company, we can get this done properly.

Anyone who has a set of JWT/NISMO mounts that are not installed and is willing to send let me borrow one or two to do some testing, please PM me, I could pay for shipping and would have the mounts shipped back out within a week.

I have a set of black Prothanes on the way. I plan to try some cross drilling on them after I run some finite element analysis on different materials in Solidworks so I have a baseline of compliance under load for different materials. I may also be able to cross drill and fill the holes with another material and see how that changes things. But I really need to test a JWT/NISMO rear mount and see what the differences are.

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2012-02-04 23:13:23

#52

HJBarker

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Hey guys, just lurking about... been following since OP.

Any luck locating a set of JWT/PR/Nismo mounts?

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2012-02-05 05:06:42

#53

tswii

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Originally Posted by DMSentra

Yeah, quite a bit of exaggeration in those statements.

Not really. Sure, I was being a little sarcastic about nylon being harder than steel. Unless we actually do a rockwell scale hardness test, and find the tensile strength, then it's just a guess at how different they are. I'm talking about mild steel vs. nylon. I just know both are extremely hard and resist flexing. Therefor they'd both transmit a lot of vibration. I'd say they both offer quite the same level of comfort, and danger of case cracking stress on the tranny.

Originally Posted by DMSentra

It sounds like those of you that are talking the solids down are trying to use them for daily-d's? I can imagine you'd have objections. They are pretty hardcore and not meant for the weekday warrior duty.

I don't personally DD my car. It's just a weekend toy more, or less. I hardly ever drive it.

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2012-02-05 05:11:00

#54

DMSentra

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Originally Posted by tswii

It is in fact not a guess. The differences in felt vibrations or discomfort is indeed slight, but to compare nylon as a possible direct match to tensile strength and hardness to steel, any steel, is just foolish. You honestly believe the web and hardcover media is void of material properties?

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2012-02-05 05:56:35

#55

tswii

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It is in fact not a guess. The differences in felt vibrations or discomfort is indeed slight,

So, why are we in a debate then?

but to compare nylon as a possible direct match to tensile strength and hardness to steel, any steel, is just foolish.

Where did I say anything about a direct match? My point was they would give extremely similar results in this application.

It is in fact not a guess. The differences in felt vibrations or discomfort is indeed slight,

And you agreed.

You honestly believe the web and hardcover media is void of material properties?

No, I know for a fact that they are not. I'm not going to spend my time reading, and googling around to find information on something so trivial. I did look for a while before I quoted you, but there's way to many variables.
Unless we know the exact chemical, and structural composition used in each specific material, then what can we ascertain? I don't know the exact alloy of steel, nor which polymer formula used in the nylon, and weather, or not, it's reinforced. Do you?

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2012-02-05 06:18:04

#56

Kyle

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Hm. Fancy what google can be used to accomplish.

McMaster-Carr

That shows MDS-Filled nylon 6/6 is rated at 11,000-11,500 PSI Tensile Strength.

Strength of Materials

This shows the Steel Alloy 1020 being rated at 57,300 - 65,000 PSI Tensile Strength.

Quantifying that is now easy.

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2012-02-05 11:35:36

#57

tswii

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^^^Nice researching. I used google as well. Didn't know McMaster had that info. Are those the exact materials we would have these mounts made of though? I just know there are so many different types of both is why I question it.
As a general question, not specifically directed at you. How much stronger would a boxed in stock mount shell be compared to those solid (I assume) nylon mounts be?

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2012-02-05 15:43:15

#58

Bucky13

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As to the hardness of each,suffice it to say they're both as hard as Chinese arithmetic

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2012-02-05 22:25:29

#59

Krahn48

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i have all stock mounts and stock engine, just today my rear mount snapped off, so now the stud of the bolt is stuck inside my engine, what would you guys do to get them out please let me know
thanks

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2012-02-05 23:05:52

#60

Will

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Originally Posted by Krahn48

i have all stock mounts and stock engine, just today my rear mount snapped off, so now the stud of the bolt is stuck inside my engine, what would you guys do to get them out please let me know
thanks

it doesnt thread into the engine, it threads into the mount bracket

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