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Rebuilt, new brushes, comm cut, etc.

16 single...31,000rmp @ 3.2 amps
15 double...28,500rpm @ 3.2 amps
17 single....24,200rpm @ 2.8 amps
20 single...25,000 rpm @ 2.8 amps (smoothest one, most secretive too, Thumbs can explain)

This is where i am at with vintage motors, minus the Trinity 16 single in my Astute....need more Le mans

coxbros1 wrote: ↑Tue Mar 10, 2020 4:01 pm This is where i am at with vintage motors, minus the Trinity 16 single in my Astute....need more Le mans

Very nice looking lot. Oddly, my eyes are drawn to the MRPs in the middle.

What were the benefits with the ceramic armature motors, were they the only ones?

Pretty sure its because they were "straighter" than a metal shaft...less variances...and yes i think race prep only had them, pretty classic stuff

RacePrep used and marketed the ceramic armatures - i believe they were supplied by AYK.

I do know RacePrep let other manufacturers use them as MG and SRM Racing over in the UK advertised and sold ceramic armature motors for a brief period in around 1990.

I have a couple of MG motors with them installed. The 'MG Super Magnum Eliminator' is a 13Double and has the red high fin AYK endbell. Incidentally they sold them with a Sagami can as per the Demon and LRP motors of the era, identified by the large square holes in the can base. I spent a long time trying to locate one of these as they were only sold by MG for a period of around 6months before reverting to the more normal metal shaft armatures; lots of issues with the ceramic arms snapping, as has been well documented. Awesome for the top drivers, but for club racing with multiple crashes they did not last very long. This example is pretty much perfect, label unmarked although the soldering certainly needs a tidy up!!


Advert from Feb '90:-


Advert from Nov '90, with the ceramic shaft withdrawn:-


Incidentally, their MG Red Dot from the 1990 season also used the same red AYK large fin endbell as I was sent a pair of them for that season.


I know AYK themselves sold a ceramic armature motor version at the same time, and using the same red endbell.


Not my motor but a pic i found elsewhere online.

coxbros1 wrote: ↑Mon Jan 06, 2020 4:47 pm A couple cherry examples of the greatest bag motor of all time
20200106_154042.jpg

Nice MRP motors.
These are newer versions because their can is Mabuchi or Johnson.
Early MRP were based on Igarashi.

Here's my 553, which fortunately still has a fairly tidy label.

I want that 553!

Zoom in on these, some will surprise you. all were tested at 7.2v exactly. Party on left, business on the right. Kyosho was there to party!!!

Checkpoints don't look too bad

You can really here the difference when u crank em up.....but i still like Le Mans!

Can someone help me id which model this Twister is?
Its mod motor and has 956 engraved on can and it says that on the armature too.
Thanks

Now i got one and no one will ever get it! Freshly rebuilt, cut comm, bearing, brushes and decal. Turns 26,200rpm @ 7.2v pulling 1.6 amps no load 0 degrees

She's a beaut! I traded my 240S back in the mid 80s for something and I kick my self ever since!