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I hope someone can help with a question, I just got 4 Piranha slot motors for my RMS cars that I am going to finally finish building, what I need to know is if I cut the spines down to fit will that throw the motor out of balance , and if that will what other types of motors should I get ?

Motors are smooth shaft so no splines, but I think you mean trimming the shaft length.

If so, no worries. Just trim to fit and you won't hurt a thing. I trim off one side flush depending on what car I use it in. Have bench tested and there is no change.

Thanks Harry, that was what I was looking for, I just didn't want to harm the balance of the motor

I do it all the time, never had a problem.

Sorry to piggy-back on this thread, but what do you guys use to cut the shaft? how do you dress, or smooth the shaft end after cutting?

Mr. Dremel is your friend, with the fiberglass reinforced cutting wheels.

To shorten motor shafts I use the regular Dremel number 420 wheels, those can shatter if you are not careful so always use eye protection when you use them. After you shorten a motor shaft it is a good idea to chamfer the end of the shaft. With the motor running you can hold the Dremel wheel at an angle to do the chamfer.

A couple small things, when cutting the shaft it is a good idea to cover any vent holes just so the metal filing you are producing do not get into the motor. Some people wrap the moter in tape I just cover them with my fingers. As for dressing the edge I just use the same disc I cut with. I just roll the shaft to knock off any burs that may be left from the cut.
Mike

Thanks everyone, I have 4 RMS resins cars I want to finish so I can race them , only other question I have is setting them up to run on digital track , is it hard to put the digital chips in , just trying to get all the info I can get, planning on building a home track using scaletrix track sets with the extra bundle track and borders from Professor Motor

Thanks for the replies and information Chappy, Mike and Rich. Good comments I will put to use.

I didn't see a forum for this question, I do hope I can find some suggestions , what I am looking for is the right type of controller that is best used 1) with home tracks, (other than the ones that come with the set, duh), 2) what after market controller would be good for commercial tracks, for both roundy round , and dragster tracks, building a few dragsters and have a few cars, both 1/32 and 1/24 1/25 scale cars, will be building a home track but it will be scaly wireless track on a home made table, it will be more for the commercial tracks. All info is greatly appreciated.

Thanks for the info Harry, the controllers I was really talking about was for commercial track not Scaletrix and the such, mainly aftermarket, I have a couple of Parma controllers but what I am looking at buying are ones that I can use with the dragsters I am building , if there is a difference in throttle response , just looking for any recommended ideas

I mean I know it will be how you are off the line when the light turns green, as in how quick you are grabbing the throttle, I just want to know which brands to look for

Lot of guys use remote auto starter switches for drag racing. Nobody uses electronic (Pro Motor) or resistor type (Parma) controllers for drag racing. Remote starter switches are usually only a couple bucks at the auto parts stores.

For commercial track racing 35 ohms is too slow. Mostly guys use 1-3 ohms for Parma and for Pro Motor a lot use the basic PM rental controllers for commercial tracks. A twisty slower home track requires the 35 ohm controllers.

Thanks for the info mattb , will be looking for those