The white endbell motor was fitted to earlier model cars up till about . . . um maybe 4 years ago.
It was known as a V12/2 motor. It developed 25,000RPM, but a modest torque figure which I forget.
The later model cars have the V12/3 motor with orange end-bell which develops 21,500 RPM, but has much higher torque figure. It's overall power rating is a little higher than the earlier motors.
You could test these for straightline speed if you ever want to exactly equalise them, - even by starting them off a couple of metres apart and running a slow lap then calculating the difference in distance traveled - a bit crude, but a gauge to use.
Then adjust the crown gear on one for more or less teeth to offset RPM versus torque to balance up acceleration and top speed more closely.
One other tidbit - the current motors have a variable performance. Some develop 5% more or less power than the stated spec.
I have one out of the box which is developing 23,200rpm, and also seems to have very good torque . . .
I picked out a Racer Sideways car for my friend Duncan the other night, very disappointing performance, motor seemed to be unbalanced, put another orange endbell motor in, spare from a Ferrari F40 kit, much better. I still think NSR motors are more consistent.
Thanks for the info..but now you have put your foot in it!I have more questions.
a)I always buy cars in pairs, normally the same model but in different colours, so as to easily distuingish between the two when racing.Sometimes the one car seems faster than the other.The test I do is to run both cars on the same lane directly behind each other at a constant speed.(I know this is not healthy for the controller) The way I figure it is they should stay in close contact with each other if they are more or less the same.Is this a valid conclusion?
Scalextric cars with the 'long can' motor normally have a black pinion fitted that is held tight with a type of cup.Do they have the same amount of teeth as the white ones ?(Not that I a lazy to count but my arms are too short to see)
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