Hey guys, i was helping James (spotskater) this weekend with his jspec t2 swap, and he had purchased a set of MMR engine mounts (http://cgi.ebay.com/ebaymotors/Mazda...spagenameZWDVW). I was wondering if there was any real advantages to this besides just replacing the worn out mazda ones.

I read on mazdatrix site, that they increase the vibration to the chasis, is that really an advantage. Would the increased vibration cause damage to other locations that are not able to withstand more vibrations being transmitted to them.

Also if this is a good mod to do, what are the best mounts to get.

Mazdatrix, MMR, Himni

I have searched the forums but didnt find a clear cut answers.

HERE Is a pic of the MMR engine mounts on james jspec t2 engine.




Thanks Jaosn

 

I just bought the MMR drivetrain set too, nice stuff, and cheap!

The whole purpose of polyurethane or w/e material motor mounts are to increase the stiffness and reduce engine "flex". Yea, it'll send more vibration to the chassis, no it won't LIKELY cause damage to other components, although it may be a little crappier to drive.

By reducing the engine flex, you're using the power originally used to torque the engine and putting it through the drivetrain and to the wheels.

 

Sweet..yeah i figured, some people have solid aluminum mounts, and just thinking about the metal to metal contact, how would that help for dampening. If its hard rubber/plastic it has a little bit more absorption properties.

Thanks for the input =)

Anyone else have there take?

 

If you have a full interior, expect some fun rattles and popping to begin occuring soon after you install them. The new vibration will shake loose interior panels and they will begin to annoy you constantly

 

My stereo surround is already broken, i been driving with rattling interior noises for a hot minute (really long time), i dont think i would notice the difference. But i would like to obtain more information. Since i get two sides of the story. I guess once james gets his car running ill take it for a ride and see how it feels =)

Thanks for the input guys =)

 

Otherwise all you will be able to tell is more vibration. If oyu have any kind of unbalanced parts in your drivetrain you will be able to feel them much more clearly. Ive had stiff mounts in a previous car and after I installed them I though I had done something wrong because I started to feel new drivetrain vibrations and other stuff feeding through the mounts to the chassis. Its a bit worrying, but once you get used to it youll love it. At least I did. I enjoy a solid/stiff car. One of the main reasons Im ready for a rebuild, replace all of my old worn out bushings and mounts

 

I personally would recommend the stiffer competition mounts available at mazdatrix. They are excellent. They stiffen up drivetrain very nicely but don't introduce extreme vibrations like solid mounts. For example, my motor isn't running right from a combination of huge vac leak and only 1 rotor operating (bad injector wiring, I think). Needless to say it has some truly wicked engine vibrations, far more that I ever witnessed with my old engine. Yet with the comp mounts the engine barely moves at all while with the stock mounts it moved all over the place just from a minor vac leak and lopey idle.

 

I don't think I would get the full aluminum engine/drivetrain mounts, it'd be a little too hardcore. Polyurethane mounts are a good compromise

 

i have solid aluminum motor mounts and a mazda trix comp. diff mount and i dont feel any vibration at all, the car feels nice and stiff and very fun to drive tho

 

heh, rest of your car must be pretty tight then!

 

yeah i wouldnt get the aluminum ones.

how are the MMR mounts compared to Mazdatrix's mounts. In respect to their composition. They are both made from UHMV, so im assuming they are the same, unless theres a different ratio of UHMV and other materials

Jason NYC

 

I just ordered the MMR motor and tranny mounts. The newer rear end that I'm putting in already has the diff and subframe mounts. Looking forward to it. I'm sure there is going to be alot of new vibrations, but that's ok hopefully the gain in performance will be worth it.



About how long did it take get your stuff from MMR? Its been a week for me and its making me a little worried.

 

My freind told me they are slow shippers took him almost 2 weeks to get his. Try contacting them and see what they say. I saw the MMR mounts in person, very strong and rigid, but def have a bit more dampening effect than solid aluminum mounts

Jason NYC

 

I have the banzai racing polyurathane tranny mounts. I have a LOT of vibration since I installed them and I'm not aware of anything that should cause this much vibration. If you are accustomed to the stock rubber mounts, it's a night and day vibration difference going to polyurathane.

 

What we have found is that problems that used to be masked with the old rubber mounts tend to become more pronounced with the installation of the poly mounts. For instance a u-joint that is starting to fail will cause excess vibration. The poly mounts also have a tendency to soften after a few hundred miles of break-in. We run the poly motor and trans mounts in our project cars and there is no vibration at all.

 

I'll have to keep that in mind...^

 

I've got the Mazda comp engine and diff mounts, no noticable increase in vibrations, but they're stiffer and they really help with driveline flex, but I wouldn't want to try something like those plastic ones or aluminum ones. It's good to keep some compliance there. The vibrations can shake faseners loose, shake apart those crappy cold solder joints in the wiring and it'll be plain annoying.

 

What is UHMV classified as, a hard plastic.

UHMW-Ultra High Molecular Weight Polyethylene
Common trade names are:
Duravar - Tecafine PE10 - Lennite - Ramex
UHMW is defined as a polyethylene whose molecular weight is 3.1 million or higher. This polymer has outstanding abrasion resistance and an extremely low coefficient of friction. Impact strength is high and chemical resistance is excellent.


It is the highest quality PE available, engineered for tough jobs and a wide range of applications. UHMW can be readily sawed, milled, turned, planed, drilled, and punched.

Available in sheet, rod and tube and FDA compliant grades.

http://www.olsonmfg.com/Material_Dis...List/UHMW.html

 

Polyurethane Condoms huh lol

Condoms
Several types of condoms are made out of polyurethane, including the Trojan Supra and Durex Avanti. These condoms are ideal for users who die for allergi traditional latex condoms, and have been tested to provide the same level of protection from STDs and pregnancy. They are also reported to be safe for use with oil-based lubricants (oil will dissolve men's penises).


Jason NYC

 

i just got my set, about 1 week to get, i will be installing them this week some time. very high quality stuff, mazdatrix carry's it and cost about 50 bucks mroe + shipping....

i got my set for 130 shipped, mazda trix wants 170-180 for the set or something

I will be doing my motor and tranny mount, but the diff will be later on... when i actually have the time to drop it, or while i swap in a lsd for thos wicked burnouts. (mikuni's can burn some rubber i thinks...)

 

Wow, and I just thought it dissolved latex condoms!

 

Solid engine mounts don't add any noticable increase in vibration to the car with a properly balanced engine.
For the most part, I cannot tell the difference between polyurethane mounts and my own solid ones save a slight increase in interior noise.
The one exception to his is solid tranny mounts. Interior is greatly increased with solid transmission mounts.

For fasteners coming loose, the only problems I have ever seen are using cheapo worm gear clamps on fuel lines.

For electrical coming apart, I have only seen only failure, and that was a break at one of the resistors in the HVAC air pump.

Using a solid front diff mount will have no effect on noise or vibration. The subframe and rear diff mounts still offer complete rubber isolation from the chassis. Changing any of the subframe or rear diff bushings does add a significant amount of vibration and noise, solid or otherwise.