1/12 forum
Hi guys, I ran my CRC Carpet Knife with a CO27 the weekend but I find gearing it right is hard. I'm gearing it too long, but thats what I normally geared the motor at. It didn't even get hot?
Is it different when gearing on a 1:1 ratio?
And then I'll be running it with a 10T Brushed mod motor this weekend... Can someone please give me a suggested gearing combo?! I've got a 98T Spur in the car, so what pinion? Thanks
Is it different when gearing on a 1:1 ratio?
And then I'll be running it with a 10T Brushed mod motor this weekend... Can someone please give me a suggested gearing combo?! I've got a 98T Spur in the car, so what pinion? Thanks
Tech Addict
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Posts: 727
From: Halifax, Nova Scotia, Canada
Hi guys, I ran my CRC Carpet Knife with a CO27 the weekend but I find gearing it right is hard. I'm gearing it too long, but thats what I normally geared the motor at. It didn't even get hot?
Is it different when gearing on a 1:1 ratio?
And then I'll be running it with a 10T Brushed mod motor this weekend... Can someone please give me a suggested gearing combo?! I've got a 98T Spur in the car, so what pinion? Thanks
Is it different when gearing on a 1:1 ratio?
And then I'll be running it with a 10T Brushed mod motor this weekend... Can someone please give me a suggested gearing combo?! I've got a 98T Spur in the car, so what pinion? Thanks
Hope that helps.
Depending on the track, the motor might not get that hot at all. If you're running on a pretty open, flowing track there's not a lot of starting and stopping which means less stress on the motor. A tighter track will heat the motor more. Gear for fast lap times and keep an eye on the motor just in case. It sounds like you won't have any heat issues though. What are you geared at right now with the CO27? I was running a 19 turn brushed motor geared 34/98, was within 2 laps of dumping each run and the motor was just a little warm after each run. Just because it's not getting burning hot doesn't mean you're not running it at max
Hope that helps.
Hope that helps.
I geared it 25/98.
But how should I gear the 10Turn mod motor then?
Tech Regular
Joined: Aug 2003
Posts: 256
From: England
I think you have wheelbase mixed up with track 
The question should have been in the 10R5 section where you can adjust the wheelbase (the distance between the front and rear axles) as opposed to track which is the width of the front axles (or at least the gap between the front wheels)

The question should have been in the 10R5 section where you can adjust the wheelbase (the distance between the front and rear axles) as opposed to track which is the width of the front axles (or at least the gap between the front wheels)
I think you have wheelbase mixed up with track 
The question should have been in the 10R5 section where you can adjust the wheelbase (the distance between the front and rear axles) as opposed to track which is the width of the front axles (or at least the gap between the front wheels)

The question should have been in the 10R5 section where you can adjust the wheelbase (the distance between the front and rear axles) as opposed to track which is the width of the front axles (or at least the gap between the front wheels)
So for wheelbase longer should be more stable but harder to turn into corners.
over 1,301,115 views since first post, is 1/12 racing really big now? I used to race 1/12 back in mid and late 90s, but TC took over when ROAR & IFMAR started sedan class.



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I've only run the 19 turn motor in my 12th scale, we didn't have a mod class at my old track.
