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TSR motor pinion size


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#1 Pete L.

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Posted 09 January 2020 - 08:08 PM

Fellas,

 

 I run the TSR motors in some Retro races, I'm running 48 pitch 9 tooth pinion with either a 28 t crown and the motor runs really hot. Any thoughts on maybe an 8 tooth with 27t crown ?


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#2 Tim Neja

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Posted 09 January 2020 - 11:18 PM

ON what kind of track? At Buena Park on the flat track--I run a 9--on the King track -- 10.  Usually a TSR will run fine with a 9-- but no reason not to try the 8 and see if it helps your heat problem.  The defining rule,  what gives the best lap times?


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She's real fine, my 409!!!

#3 John Streisguth

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Posted 09 January 2020 - 11:23 PM

Keep in mind the TSR motor runs in the opposite direction of every other motor.  9x28 should be fine, in fact on many tracks we ran 10 tooth pinions.  I bet you have it running backwards.


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#4 slotcarone

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Posted 10 January 2020 - 12:32 AM

Keep in mind the TSR motor runs in the opposite direction of every other motor.  9x28 should be fine, in fact on many tracks we ran 10 tooth pinions.  I bet you have it running backwards.

Exactly!!


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#5 John Streisguth

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Posted 10 January 2020 - 06:20 AM

I just had a thought....weren't the last batch of Falcon 7 motors labeled "TSR Falcon 7"?  Pete, double check the motor...if it also says Falcon 7, what I said doesn't apply. But if it's one of the original TSR motors, it does run the opposite of just about every motor made these days


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#6 tonyp

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Posted 10 January 2020 - 06:58 AM

I usually would run one tooth bigger than I would use on JK. Mostly 10's with out losing punch or brakes.
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#7 Pete L.

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Posted 10 January 2020 - 12:00 PM

Fellas,

 

 It does run backwards, it has an arrow for direction of rotation...I've got a number of these motors and plan to assemble cars for 3 or 4 of the Retro East classes as I've got 4 chassis read to go.

Two each GT/Can-Am and a pair of F-1 cars as well as an old JK kit chassis I ran 10 years ago.  I'll try the various suggestions in the different chassis and see which are easiest for me to drive. Thanks for all the info !!!

 

Here's the track I'm gearing for.

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#8 John Streisguth

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Posted 10 January 2020 - 02:26 PM

Pete:

There should be absolutely no heating issue on that track with a 9 tooth pinion, and you could probably run a 10 on it.  Something else is causing the heating.  Maybe the com is corroded a bit from sitting so long?  Maybe try a water dunk for a second or two to clean it.  Otherwise I would check to make sure nothing is binding.  If that all fails, it's probably just a bad motor (they generally were decent motors, but I had a few outright failures when we were running them)

 

Of course, the temperature it's actually getting to can be subjective.  IIRC, they usually got too hot to touch, and people were looking for all sorts of ways to cool them down at lane changes.


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#9 Don Weaver

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Posted 10 January 2020 - 04:35 PM

Check when running on a power supply that the motor bracket isn't binding the motor by loosening the motor screws and listening for an increase in RPM.  If so, straighten bracket and file flat.

 

Don


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