2018.02.03, 06:46 PM
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#1
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Registered User
Join Date: Jan 2018
Posts: 10
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motor mount types
Hey guys does the motor mount position matter when selecting a body or is it only wheelbase? Also is there any ready sets out there with another mount type other than mm? The only ones i have seen have been the mid mount position. Trying to find an rm machine and just wondering if the only way was to build one myself.
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2018.02.03, 08:47 PM
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#2
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Moderator
Join Date: Sep 2002
Location: Washington, DC
Posts: 35,480
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body wheelbase, body height, etc. can influence motor mount configuration. most of the 86-90mm bodies ran RM however the MM2 motor mount has replaced the RM. Not sure they sell a kit with HM anymore.
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2018.02.04, 01:22 AM
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#3
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Registered User
Join Date: Oct 2016
Location: Tri-Cities, WA
Posts: 207
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The Porsche 911 GT3, Shelby Cobra, and Ferrari GTO are all rear mount ready sets that are currently available if you look around. There are probably a few others. They are all 90mm to 94 mm wheelbase.
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2018.02.04, 06:38 PM
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#4
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Registered User
Join Date: Jan 2018
Posts: 10
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So anything over a 94mm wheelbase and the rm mount can not be used?
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2018.02.05, 01:01 AM
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#5
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Registered User
Join Date: Oct 2016
Location: Tri-Cities, WA
Posts: 207
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Quote:
Originally Posted by honda3
So anything over a 94mm wheelbase and the rm mount can not be used?
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You might be able to try buying the longest t-plate you can and move it as far back as it will go. Generally, 98 is mm and 102 is LM, which is another slightly different mm design.
The sports 2 ready sets don't use the MM2 mounts yet that I know of, but I think the Brushless cars use them exclusively. Xpower makes a really nice alloy rear mount that is quickly adjustable, but it is expensive and advertised to go from 86 to 94 mm.
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2018.02.05, 06:56 AM
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#6
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Moderator
Join Date: Sep 2002
Location: Washington, DC
Posts: 35,480
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Quote:
Originally Posted by honda3
So anything over a 94mm wheelbase and the rm mount can not be used?
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Why would you want to? RM is among the least desired motor mounts. From least to most desirable; HM, RM, MM2/MM, LM.
Even for 98mm, the MM2 is superior to MM with the rear disk damper if your sticking to stock plastic parts.
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2018.02.05, 12:16 PM
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#7
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Redline
Join Date: Aug 2012
Location: Greater Vancouver, B.C.
Posts: 218
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MM2 accommodates 94, 98 and 102 mm configurations, but the motor mount and shock combo is VERY tall and most bodies will not fit over it. I have confirmed that only the GT86 (94mm) and R8 (98 mm) fit properly over the MM2 mount.
The “LM” motor pod can be used in the 98mm configuration, but you will need a special damper to fit it. The rear ride height is also reduced by about 1.5 mm.
The “RM” pod is actually fun with stock motors, but most tracks do not race RM equipped cars. Against 98mm mid motor cars, the RM cars will always loose, all else being equal. That doesn’t mean they are not fun to drive, but that they are simply not competitive.
Some tracks have a “HM” class were everyone runs the Abarth or Mini Cooper body. TONS of fun to drive but deliberately slow. The cars traction roll and tumble quite easily, but if everyone is running them together it’s great fun.
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2018.02.05, 02:35 PM
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#8
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Moderator
Join Date: Sep 2002
Location: Washington, DC
Posts: 35,480
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We have squeezed the MM2 into just about everything. I have it on my 599XX and runs great. Even works with stock motors well with some tweaking. Just about everyone in our stock class runs LM or MM2 for the disk damper vs. just the top shock on RM and MM.
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2018.02.05, 04:55 PM
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#9
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Redline
Join Date: Aug 2012
Location: Greater Vancouver, B.C.
Posts: 218
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Interesting. I could not get mine to fit under an Original McLaren F1, a F1 LT, a 12C GT3, or a NSX GTR. It rubbed on all of them unless I omitted the top shock and ran the disk damper only.
I guess that is to say, your mileage may vary
Last edited by TeeSquared; 2018.02.05 at 05:50 PM.
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2018.02.05, 08:00 PM
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#10
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Registered User
Join Date: Jan 2018
Posts: 10
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What does LM stand for? Is it a type of mm config? Is the LM mount used exclusively for the le mans style bodies? Thanks for the help guys, getting back into this stuff after 15 years and a lot has changed.
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2018.02.05, 08:20 PM
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#11
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Redline
Join Date: Aug 2012
Location: Greater Vancouver, B.C.
Posts: 218
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LM stands for "low mount" but is a convenient way of remembering its mostly meant for the lemans type bodies.
It will fit the 98mm wheelbase, but you will need a special damper or adapter to make it work. Rear ride height is reduced about 1.5mm so you will need to adjust the front accordingly. The updated MR-03 front arms help with this since they lower the ride height. Also consider using shorter springs. I prefer the Kyosho "short soft" variety
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2018.02.05, 08:25 PM
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#12
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Redline
Join Date: Aug 2012
Location: Greater Vancouver, B.C.
Posts: 218
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Part # for Kyosho MML damper (will fit the LM pod in the 98mm configuration): R246-1352
Part # for MML Adapter for other dampers: MZW306
Part # for updated front suspension arms (lower ride height): MZW433
Part # for short front springs: MZW423
MML = LM motor pod in 98mm wheelbase
Last edited by TeeSquared; 2018.02.05 at 08:30 PM.
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2018.02.06, 03:44 AM
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#13
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EMUracing
Join Date: Oct 2004
Location: NYC
Posts: 7,417
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While I have used an RM mount in the past with a 98mm murcielago, I cannot really recommend it unless you are just tinkering. It generates a lot more rear traction, at the expense of on throttle steering. Custom t- plates are needed as well, and they are not easy to come by.
I haven't tried the MM2 mount or damper set, but it looks like a versatile mount.
Know that if you use an LM mount that it is not compatible with a standard racer differential. And adds 3mm offset to the rear wheels, so if the body calls for anything less than 2mm offsets, the wheels will stick out.
__________________
EMUracing
Micro RC Syndicate /DG Designs /GSR /Reflex Racing /Fast By Faqish /MurderTown Racing
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2018.02.06, 11:44 AM
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#14
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Redline
Join Date: Aug 2012
Location: Greater Vancouver, B.C.
Posts: 218
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Quote:
Originally Posted by EMU
Know that if you use an LM mount that it is not compatible with a standard racer differential. And adds 3mm offset to the rear wheels, so if the body calls for anything less than 2mm offsets, the wheels will stick out.
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Great point totally forgot to mention this!
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2018.02.06, 05:13 PM
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#15
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Registered User
Join Date: Nov 2015
Location: Ontario, Canada
Posts: 107
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Quote:
Originally Posted by TeeSquared
Part # for updated front suspension arms (lower ride height): MZW433
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Hmm, how does that part number lower the ride height?
It's just a glass reinforced replacement for the stock items?
Thanks
Tim
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