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Rob H

04-01-2009 12:37 PM

Tamiya Motor Differences

Does anyone know the difference between the standard tamiya kit motor (540-H, part number 7435035) and the 540-J motor, part number 53689?

The specs for the 540-J are as follows:
Usable Voltage = 7.2v - 8.4v
Torque at best efficiency = 255g/cm (7.2v)
RPM at best efficiency = 14,500rpm (7.2v)
Current drain at best efficiency = 7.9A (7.2v)

Can't find specs for the kit motor

Matisse

05-01-2009 01:14 PM

http://home19.inet.tele.dk/martinjordt/index.htm

all the info you need on tamiya motors can be found here mate.

matisse

sosidge

05-01-2009 02:47 PM

Quote:

Originally Posted by Matisse (Post 192754)

http://home19.inet.tele.dk/martinjordt/index.htm

all the info you need on tamiya motors can be found here mate.

matisse

Ouch. That is not an easy site to use.

Anyway, the 540-J is the Johnson motor. The common belief is that it is a bit faster than the Mabuchi motor (which I think is supplied under the 7-figure part you mention).

Tamiya supply quite a wide variety of silvercan motors in the kits, I've had two different types in modern kits and seen different ones again in vintage kits.

Rob H

06-01-2009 06:58 AM

Thanks for the reply, sorted now, here's the link for the motor specs.

http://medlem.jubii.dk/martinjordt/r...ors/motors.htm

You are correct, the J motor does look like it would be quicker, rpm are about the same but it has more torque so would likely pull slightly higher gearing.

One thing caught my eye though, this was in relation to the 540 sport tuned motor (#53068), the site quotes two versions a European and Asia/USA with different windings, (23T / 0.8mm (Europe), 27T / .65mm USA/Asia). Can't see how these would have the same spec?

Anyone have any experience with these?, any difference?, can you tell without taking it to pieces?

sosidge

06-01-2009 08:55 AM

There is no way of telling without breaking the motors apart, personally I think this idea of two "sport tuneds" is a myth, there is no realistic way Tamiya would have two distinct motors under the same part number, and no realistic way of ensuring one went to Europe only, especially in this day and age with easy international mail order.

terry.sc

06-01-2009 01:21 PM

There were two types of motors, the difference was that the 23 turn had no advance timing, the 27 turn has the timing advanced to get the extra speed out of it as well as different wire thickness. I believe all modern Sport Tuned motors are 27 turn.

I also don't believe Tamiya deliberately made two different types of motor for different markets, more likely Tamiya changed motor suppliers and to match the performance of the old motor the new supplier had an off the shelf 23 turn motor. Tamiya printed up the can and sent this batch to Europe, and someone took the time to unwind one of these.

Rob H

07-01-2009 08:10 AM

Quote:

Originally Posted by terry.sc (Post 193190)

Interesting, how many years ago would that have been?.

From memory don't think current Sport Tuned motors have timing advance do they?

Do we know if they current motors are 23 or 27 turn, they don't seem to have the power to be 23 turn

I suppose that would make the older ones faster?

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