Hello
Simple question: Does anyone have experience with using the FC Mazdaspeed / Competition engine mounts on the FD?
They are much cheaper ($100 vs $800 per pair) and very similar to the common polyurethane variants in shape/size. Its also the same hardness as the FD Mazdaspeed / competition mounts.

I will pair them up with a set of rubber mazdaspeed differential mounts (Im NVH allergic).

 

Do you have a part number for the mounts pictured? Those are not FC mounts.

FC comp mount -


The comp mount is part number FBY1-39-040 and the standard mount is part number FB01-39-040A.

The FC mounts are too large and thick to fit the FD. I'm wondering what the mounts you have pictured are for, maybe a Miata?

Dale

 

They are not NA or NB Miata at least.
I was pretty sure that it was FC without the «cap» on, altho i have no evidence or part numbera except the pics.

The pictures are from FD Specialist (Marcus Read from Oz), and he was pretty tight lipped about the origin, but claimed they are Mazdaspeed.

Thus my conclusion is that they came from the FC, as it is the only other «mazdaspeed» optioned car with 13b. Renesis mounts look very different.

 

Looking at the picture again it really looks like the mount without the steel "hat" at the top. On the FC that steel hat is typically bonded to the mount. They may have done a cost-reduced version that you are supposed to reuse the steel hat or something.

You may want to post in the 2nd Generation section and see if anyone there knows about it.

Dale

 

interesting, i've seen these for sale on YJA, and i just assumed that they were FC mounts with the top machined off (which would work BTW, essentially what i have in mine)

i wonder if Mazdaspeed started selling FD mounts without the brackets? that must knock a lot off the price

 

Looks like the ones rx72c(??) sells too, you might be getting plugged up the behind, without a reach around, on price - although shipping is crazy atm! https://www.facebook.com/Raceonlygarage/photos/a.484163221660089/2824424570967264/?type=3&theater

 

The seller on YAJ lists the pair for 11,000 Yen. This is a translated description:

Product name
RX-7 (FD3S) Late reinforced engine mount

Introduction of left and right set products

I was asked by an acquaintance to make some of them, which were well received and were exhibited.

Since the FD Mazdaspeed engine mount is expensive, it is hard to buy.

If it is a later engine mount, I think that only the mount part will come off.

Mazdaspeed engine mount for FC3S is processed and used for the mount part.

This is a new FC Mazdaspeed engine mount processed for FD.

The stay part is not included. Only the mount part.

 

Thanks! That should confirm my theory that they are FC mounts, and considerably cheaper than FD.
Next question is can my OCD live with anything less than OEM FD even with the price they are sold at...

 

My vote is yes, your OCD isn’t worth the extra $500 FD mounts are when all you’re getting are the arms with it. I vote you order some and confirm this in person

Matt

 

yes! the actual mount part is the same size FC vs FD, i basically did this a few years ago when i built my car (FC with an REW) and its fine.

 

Interesting. I wonder if the seller is somehow removing the metal cup or has found a source for just the mounts without the cup.

Regardless is there a good source for these?

Dale

 

He is modifying the FC part by removing the metal cup and is likely the supplier to AUS sellers or at least their inspiration.

​​​​​Here is the YAJ auction link:
https://page.auctions.yahoo.co.jp/jp/auction/j649161614

Mazda Motorsports sells each FC competition mount for 37.xx, for those interested in tackling the removal of the cup and not pay the markup from the seller on YAJ.

 

Or you could just make your own mounts with a sawzall, wood drill, and $10 worth of 3" polyurethane round from eBay. NVH isn't much different than my daily.

 

it would be really easy to chuck the FC mount in a lathe and take off the top, but the YJA guy's cut is so clean it looks factory

 

Tight-lipped huh. —-> https://fdrx7.com/forum/showthread.p...ghlight=Marcus

 

Haha yeah, I know he is not very popular on that forum, and there are claims of fraud going both ways apparently. I had a long reading session on both that board and his Facebook group before purchasing anything off him.
And he came through with the seatbelt clips and the belt hole covers for the RZ seats. Im pretty sure the hole covers are not OEM (no oem bag like the other parts) but he said its the same. So my guess is that its the ones Recaro sells for their seats.
He is also pretty hard to communicate with, like the other Australian selling his turbos and intercoolers here on this forum.

So thats why i always doublecheck to confirm anything coming from him

 

How is the FC rubber mount attached to the top? Is the top threaded or is it joined by adhesive?

 

its bonded

 

I purchased the Mazda speed mounts in hopes of figuring out just what needs to be done to get them in my fd. Anyone have any suggestions on where I should start?

Am I cutting this thing up and drilling a hole through it or trying to heat it up and separate it.

 

I think whoever was modding those FC mounts for an FD was cutting them in a lathe or some sort of machine operation.

The top stud is part of the metal "hat" and the rubber is bonded to that on the bottom side.

I think the technique is to cut off the bulk of the metal hat that isn't needed.

Dale

 

something like this without the center piece to cut the mount off the steel cap on a drill press maybe?

 

I don't exactly know what I'm doing but I'm learning and having fun. I've got an idea or two in my head and this is what I've done so far. I'm sure I'm going to make alot of people unhappy here.

 

do they not fit with the cap on? I mean, extra heat shield!

 

it might actually. the FC uses that top cup and a bottom "stopper"*** to keep the engine in the car if the mount fails. the FD uses those straps. you should use something

*** the stopper might actually limit engine movement under power too, like the Rx8, TBD though

 

Really, that's not too bad in the pics.

I could see that hat hitting the subframe on the FD since the motor mounts sit down in the pocket of the frame.

I'll put it this way, I would be VERY tempted to do this myself next time I need motor mounts!

Dale