18 replies to this topic

[mhslot13]

Maybe some one can can make sense of this ! 9 - 27 48 pich gear,.765 tire you get a ratio of 2.30.. now go to a 12-36 .765 tire 2.30 ratio so is there any advantage running 64 pitch over 48 pitch gears .... thanks

[Bucky]

The smaller teeth of the 64 pitch are said to be more efficient. I think it has something to do with the angular difference of the pinion and spur mating, but I'm not an engineer and haven't tested if there's a noticeable difference in lap times myself.

[Bill from NH]

The higher the pitch, the finer a gear ratio can be tuned by adding a tooth or subtracting a tooth. 

[John Luongo]

quite some time ago we ran x12 motors with 9-36 gears, 4-1 ratio. some one tried 8-32, same 4-1 ratio and the cars had faster acceleration and better lap times. the only real difference was the smaller gear base circles which may have allowed the motor-gear-tire assembly to accelerate quicker. whenever i tried 64 pitch gears, i felt that the car was much smoother to drive and responded to power input faster. best regards

[Pablo]

Maybe some one can can make sense of this ! 9 - 27 48 pich gear,.765 tire you get a ratio of 2.30.. now go to a 12-36 .765 tire 2.30 ratio so is there any advantage running 64 pitch over 48 pitch gears .... thanks

 

Strictly from a gear ratio/final drive ratio standpoint, there is no advantage one way or the other.

 

As far as which one is "better", only lap times can give you that answer.

[Mark Onofri]

If I'm not mistaken, the armature timing is what makes the difference between wether to use 48,64,72 or,80. I have the references to this effect in a Sonic catalog and, a Front line tip sheet that came with a set of magnets. Of course there are other factors but, they (Sonic & Front Line) concur timing is the main factor. Not to mention air gap.
Let the debate begin!

[gotboostedvr6]

Choice of gear pitch has nothing to do with choice of timing

[Mark Onofri]

Next

[Mark Onofri]

I wish I was racing against more people like you 😂

[Phil Smith]

The smaller teeth of the 64 pitch are said to be more efficient. I think it has something to do with the angular difference of the pinion and spur mating, but I'm not an engineer and haven't tested if there's a noticeable difference in lap times myself.

Plus one.

[gotboostedvr6]

If we raced each other I would teach you many things and you would be a faster racer. Until then I’ll occasionally see your posts and correct where needed.

I wish I was racing against more people like you

[Mark Onofri]

Thanks, I appreciate all the help I can get.
Rather than argue the point, I'll post what I referred to. You (and everyone else) can interpret it your own way.
Fair enough?

[gotboostedvr6]

Please do

[Pablo]

If I'm not mistaken, the armature timing is what makes the difference between wether to use 48,64,72 or,80. I have the references to this effect in a Sonic catalog and, a Front line tip sheet that came with a set of magnets. Of course there are other factors but, they (Sonic & Front Line) concur timing is the main factor. Not to mention air gap.
Let the debate begin!

 I'd like to see it, too, where Sonic and Front Line recommended in a document using timing and air gap as a basis for deciding which gear pitch to use. Show it to us and there will be no debate

[Mark Onofri]

Working on it

[Mark Onofri]

Here is another way to explain it
1) course pitch: high torque, low speed
2) fine pitch: low torque, high speed.
Better?
I've narrowed my search for the paperwork that I said I would post to 5,000 sqft. I hope this will suffice in the meantime.
Most of you will see the correlation between timing and air gap in determining optimum pitch. Or ,just go by the rules. There ALWAYS right.....

[Bucky]

Im not trying to pile on, but what youre writing doesnt make sense to me when discussing slot cars. I think its best to stick with conventional wisdom that finer pitch gears are just slight more efficient.

[Bill from NH]

Mark, even when we see it in print from Sonic & Front Line, not all of us are going the believe it. The Sonic owner, Phil Hacket, is a Slotblog member. A PM ask of him would be an easy ask, but I don't remember him saying he ran slot cars. The two individuals who have owned Front Line are now both dead, So, you'd have a hard time sourcing them.

[Mark Onofri]

Ok