The Truth about the Rear Motor Mount

DS motorsports

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The facts about a product. No myths or stories.

The rebuttle to the myth:
http://www.mazdas247.com/forum/showthread.php?t=123734086

When one makes a thread about another company’s product and then locks it, this tells you they do not want the truth coming out. The fact of the matter is Medievals new rear motor mount was designed to be more affordable for the masses. So let’s get down to business and put out facts on their new motor mount and kill the rumor mill now.

Medievals new rear motor mount does in fact look very similar to the TRZ at first glance. When designing a motor mount you are limited in some aspects. Bolt center lines and locations limit you. With that being said, there are only a few ways to skin a cat and
there are differences.


1st, bushing material. Medieval uses a CUSTOM hot pour urethane and not an off the shelf cold pour Energy Suspension bushing. Medieval's bushing is not a standard hot pour. It has a few extra ingredients that give it added strength and a higher heat range. A standard hot pour system is 35% stronger in shear and has 20% higher heat range. Medieval's system is 15% stronger in shear than a standard hot pour and 17% higher heat range than a standard hot pour. Has Medieval ever had a bushing failure, NO! Medieval has not had a bushing failure and if one does arise, They WILL warranty it regardless and I mean regardless. It doesn’t matter if you used the motor mount to defend off a burglar or a UFO shot it with a laser gun, They WILL warranty it period. Next is size of bushing. Medieval's bushing is 2.5 times larger than the TRZ bushing. More material means more harmonic control. The smaller the bushing you go the more NVH (noise, vibration and harshness) you will have. These pictures are of the size bushing they use and the size TRZ uses. You make up your mind on which one is smaller. Now, let’s talk about axial movement. The smaller bushing has a max movement of .270 while the larger bushing has .388. The difference is .122. This translates that the larger bushing can allow the motor to move almost 1/8” more than the smaller one. That is right, almost an 1/8”. Now, here is where we will shine, the larger bushing will transfer 50% less NVH than the smaller bushing. Sometimes smaller isn’t better.

2nd, Mount Neck. To make a claim our neck is thinner without ever having one in your hand to cut apart is something a used car salesmen does to keep sales on his lot. The FACT is, I use 3/16 thick material.

3rd The nut. They did not put on a welded nut for a few reasons. They instead opted to use a shelf locking nut. The idea is shelf locking will not come loose. A welded nut that is not self locking is nothing more than a nut welded on. The bolt can still back out. The other idea is longevity. A welded nut is secure to the part. If you cross thread or if the nut starts to corrode the part is worthless because you can not secure it. If you cross thread or the nut corrodes on theirs, you simply add a new nut and reinstall. Sometimes knowing is better than believing.

Don’t fall for the myth. Know the facts!
 

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On the 1st point your simply proving his point, 2nd I can see where your coming from and without physical and visual evidence it means nothing. And on the 3rd I agree with you.
 
On the 1st point your simply proving his point, 2nd I can see where your coming from and without physical and visual evidence it means nothing. And on the 3rd I agree with you.


Sorry about that, this was orginally Medieval's post, I just forgot to change some of the words around
 
Why the change in motor mount design? I have the "1st Gen" (as I get it will be called now) Medieval Rear mount... Just a change to make it cheaper or should I be worried about it..?
 
Why the change in motor mount design? I have the "1st Gen" (as I get it will be called now) Medieval Rear mount... Just a change to make it cheaper or should I be worried about it..?


the mount has the same strengh, just this version is easier on the pockets for everyone and it adds more "sleathiness" (is that even a word?) when going in for service or warranty issues..
 
Okay well to throw my 2cents into the mix. I am very happy with my "1st Gen" mount. It does have vibs at times but others its not noticeable at all.

This uses the same type of connection as the revised mount, with the shelf locking nut. I didn't use loctite when installing the mount in November. When I changed my oil, 2 weeks ago, I checked to see if the bolts were still torqued down the way I put them (80ft-lbs on the engine side, 70 on the chassis side). And they were still spot on.

Now I can't say how the new mount is but my mount from Medieval seems to be really good quality.
 
I Have the 1st gen. Med. rear mount as well and it does vibe with the compressor on but is not noticable otherwise. I have heard that the TRZ has bad vibes which is why I went with the Med. I have always heard that the vibes on these mounts will settle down but I have had mine for several months now and it is still the same. The Med mount was only $90 shipped which was a good deal.
 
Okay well to throw my 2cents into the mix. I am very happy with my "1st Gen" mount. It does have vibs at times but others its not noticeable at all.

This uses the same type of connection as the revised mount, with the shelf locking nut. I didn't use loctite when installing the mount in November. When I changed my oil, 2 weeks ago, I checked to see if the bolts were still torqued down the way I put them (80ft-lbs on the engine side, 70 on the chassis side). And they were still spot on.

Now I can't say how the new mount is but my mount from Medieval seems to be really good quality.

I second that, I have their rear MM and the quality is excellent!

I Have the 1st gen. Med. rear mount as well and it does vibe with the compressor on but is not noticable otherwise. I have heard that the TRZ has bad vibes which is why I went with the Med. I have always heard that the vibes on these mounts will settle down but I have had mine for several months now and it is still the same. The Med mount was only $90 shipped which was a good deal.


I'm delighted to hear all 3 of you guys are satified with your Medieval mounts. This mount will give the same impreesion as the first version, but less of hit on the wallet.

We should have a Medieval and TRZ comparison soon for everyone to see.
 
The smaller bushing has a max movement of .270 while the larger bushing has .388. The difference is .122. This translates that the larger bushing can allow the motor to move almost 1/8 more than the smaller one. That is right, almost an 1/8.

Curious why someone would want more movement from an engine mount unless reduced NVH is the sole aim? This seems to be more of a potential problem to higher HP/torque cars.

Also vendor disputes can get ugly (there have been a few here in the past), hope this does not.

Good luck and thanks for supporting the site.
 
Curious why someone would want more movement from an engine mount unless reduced NVH is the sole aim? This seems to be more of a potential problem to higher HP/torque cars.

Also vendor disputes can get ugly (there have been a few here in the past), hope this does not.

Good luck and thanks for supporting the site.

I must say i look forward to the comparo, but i already see the proof of the better mount for performance. DS told us that the medieval mount allows 1/8" more movement ! That is alot. The whole idea is to lock in the driveline right? So why would you want the sloppier mount? A little less vibration is not worth the increased movement.
 
This new mount should be arriving at anytime(hopefully today.)

i read about the vides from the 1st gen mount but how excellent it performs.

my car is not a race car and while i want it to perform as best as possible, i dont want my car to be uncomfortable, hear extra noises or feel intrusive vibes so this mount is right up my alley-ESPECIALLY FOR THE PRICE

cant wait for it to arrive
 
I Have the 1st gen. Med. rear mount as well and it does vibe with the compressor on but is not noticable otherwise. I have heard that the TRZ has bad vibes which is why I went with the Med. I have always heard that the vibes on these mounts will settle down but I have had mine for several months now and it is still the same. The Med mount was only $90 shipped which was a good deal.

more vibes the better (boobs)
 
DS told us that the medieval mount allows 1/8" more movement ! That is alot. The whole idea is to lock in the driveline right? So why would you want the sloppier mount? A little less vibration is not worth the increased movement.
Not everyone wants the stiffest mount possible. Some folks, like me, just want enough upgrade to get rid of wheel hop and increase shifter feel. By your logic, the best mount for you would be solid metal.
 
I understand many people dont like the vibration that adding a stiff mount brings. The fact is though the more movement the mount allows, the less benefit you will recieve. I can tell you anything that allows 1/8" more movement than TRZ is wihout a doubt NOT going to stop wheelhop. Thats what causes wheel hop. When the car is fighting for traction the driveline wants to move all over the place. If you let it move, you get wheelhop, period.
A solid metal mount would be great, but would be too rough even for me for daily driving. The next best thing is TRZ's delrin mount. You cant get any more solid with being all metal. I switch between my delrin and poly mounts every now and then, and i dont feel either vibrate enough to b**** about. I, am a die hard racer though.... Many are not
 

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