Finding a similar motor to technigold

[ideal2k]

Technigold:

Torque at best efficiency: 430g-cm (7,2V)

R.P.M. at best efficiency: 19.000rpm (7,2V)

Current drain at best efficiency: 14A (7,2V)

Best efficiency: 81% (7,2V)

21 turns single

Does anyone know of a motor that comes as close to this as possible?

What I notice straight away is that the 14A current drain is very low, and most similar motors draw much more amps..?

[mud4fun]

LOL, that current drain was only low because the technigold had such awful design of brush you couldn't get much more amperage thru it!! [][]

In fact when I used to run technigolds in my buggies I'm sure most of the current went via the little pigtails rather than thru any decent contact with the endbell like modern motors - I still regard the techigold as being magical because I'm not sure how it generated so much grunt force from such poor endbell/brush design.[:0] The brush spring (used in the loosest sense of the word) hardly pushed the brushes onto the comm. They did however give quite some runtimes so I guess the 18amp drain is accurate. They also tolerate 8.4v and 9.6v packs without any real problems. [8D]

The closest I've come to the technigold are:

Kyosho magnetic meyhem (22t?) running on 8.4v packs - produces wheelies in my Bush Devil with relative ease, hence the totally wrecked rear end of my Land Rover shell/bumper on aforementioned vehicle - long runtimes are easily achievable, over 20 minutes from an 8.4v 2000NiCD

The Tamiya Dyna Run super touring 13t motor also produces insane torque and with appropriate small pinion gives pretty awesome performance but run times are pathetic - expect about 5 minutes if you are lucky!! I have two dyna runs that have been running 9.6v packs for over a year for bashing, they have only just had their brushes replaced and the comm is still in good shape.

PS. I use expensive 'silver' brushes in these motors as they seem to take the higher voltages better.

PPS. The motor casing on the technigold was exceptionally thick, so much so that the motor didn't fit in many cars as it was some 3-4mm larger in diameter than a stock 540. I'm guessing that extra thickness gave it the great torque figures because since I've been playing with cordless drill motors in my crawlers I've found that the torque rings that are fitted on these motors do actually work and yet all they do is increase the thickness of the motor casing by 1 mm or so??!!

[Jabba1]

Interesting discussion,great input mud4fun,How does the dynatech 01/02 compare to the technigold and dynarun?

[ideal2k]

What I notice is the Stock type RZ/TZ have quite similar ratings, only higher RPM.

RZ:

Torque at best efficiency: 500g-cm (7.2V)

R.P.M. at best efficiency: 23.000rpm (7.2V)

Current drain at best efficiency:

Best efficiency: 76%

Turns: 23

But it doesn't say how much current drain is, unfortunately?

On the positive side, it does have slightly higher RPM and slightly more torque.

[XanderP]

Maybe the tamiya gt tuned 25turn would be similar[?]

[DJTheo]

I also wondered about the extreme torque specs of the TZ and RZ, but if you see on the figures on the back of their boxes they are more around the 350 g-cm region, still a very nice modern equivalent to the TG though.

Cheers

[raemin]

The vintage kyosho lemans 240ST is prety close in terms of specs and cheap with easy maintenance (standard brushes). In the tamiya range the actopower formula (the blue one) is a 17turn, but its the tamiya engine that offers a toraue comparable to the techni. Otherwise you could use the RZ / TZ with very hard spring and silver brushes (that's if you pretend to use it at low rpm and requires lots of torque)

[steviedee]

the ~TZ and Rz are both great motors, the Tz was aimed at more torque applications but to be honest i cant tell any difference between them

[DJTheo]

I recently compared the curves of TZ and RZ at their boxes and the RZ has even a bit higher torque, I think the motors are the same except the RZ has lay down brushes which gives a bit more RPM and torque but also higher current, still both great choices for a relatively inexpensive motor, which runs with mosts ESC and has the red blue stars on it! []

Cheers

[Wireless]

I have got a bunch of RZ's. The ones in use are fitted to Falcon, KBF and Gravel Hound. It's a lovely motor and I can highly recommend it. At Kidderminster, my RZ powered Gravel Hound was as fast as Mooseys 16t powered Optima Mid but ran for 15 minutes on a 2000 NiCd...! We had some great tussles...!

[raemin]

Lay down brushes give more timing to a stock motor while still remainging within the legal constraints of 24deg timing for the bell. Strictly speaking this does not show a lot on the dyno and even reduces efficiency, in practice it gives more torque. So yes these two motors will have distinct specs.

[DJTheo]

quote:Originally posted by raemin

Lay down brushes give more timing to a stock motor while still remainging within the legal constraints of 24deg timing for the bell. Strictly speaking this does not show a lot on the dyno and even reduces efficiency, in practice it gives more torque. So yes these two motors will have distinct specs.

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Exactly what the comparison of the figures of both show! [^]

Cheers