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Old 02-27-2007, 07:49 AM   #2746
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Quote:
Originally Posted by Z.Hallett
for tc start around a 35mm
for 12th start around a 40-43mm.

what brushes and springs are on the motor? what surface type are we talkin?

-Zac
sorry, i should have told you all of that first.

here goes:

outdoor asphalt, high grip, tight track, longest straight is +/-30m (100ft) , foam tyres,

motor: CO27, putnam green shunt brushes(high Silver), std brush springs (purple)

my chassis : Tamiya TB Evo 5 Internal Ratio is 2.437. i currently have a 99T spur in the car.

hope the info helps.

thanks
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Old 02-27-2007, 09:03 AM   #2747
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Could someone check my math on this rollout calculation?

C027 motor, 6 cell, touring car, 58mm foam tires, 114t spur gear, internal ratio 1.7, target rollout 35mm as per above recommendation.

58mm diameter is 182mm circumference. 114/29pinion x 1.7=6.68 ratio

182mm/6.68 ratio=27 mm present rollout.

I come up with a recommendation of 37t pinion for 58mm tires and 39t pinion for 55mm tires following a 35mm rollout.

Yikes, if that's right, I'm way off on my gearing!! I've been running a 29T pinion and the motor gets up to 75 C maximum. That works out to a 27mm rollout.
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Old 02-27-2007, 09:14 AM   #2748
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We run 26 to 29 rollout at our track with a co27 w/ sedan. 100 ft straight semi technical.
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Old 02-27-2007, 09:33 AM   #2749
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35mm is a rediculous rollout for a CO27. I run between a 26-29 rollout.
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Old 02-27-2007, 09:44 AM   #2750
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26mm~29mm sounds spot on. i have been always running between those figures. that has been pretty much where most of our local fast guys have been rolling out. thanks for the help guys.
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Old 02-27-2007, 09:48 AM   #2751
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Thank you gentleman. The 27mm rollout is what I arrived at through my own experimentation based on motor temp and performance. The hottest the can has ever gotten is 75 degrees C.
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Old 02-27-2007, 12:04 PM   #2752
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sorry for the dumb question but who makes the "f brush" i been useing the trinity 4499 and 4504
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Old 02-27-2007, 12:33 PM   #2753
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Quote:
Originally Posted by DriftDreamer06
sorry for the dumb question but who makes the "f brush" i been useing the trinity 4499 and 4504
Finishline
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Old 02-27-2007, 12:34 PM   #2754
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Quote:
Originally Posted by DriftDreamer06
sorry for the dumb question but who makes the "f brush" i been useing the trinity 4499 and 4504
I believe it's finish line.
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Old 02-27-2007, 12:54 PM   #2755
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how are you guys getting the tire circumference 58mm tires at 182 i like to run my tires at 57mm so how do i find out what the tire circumference is thanks
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Old 02-27-2007, 12:59 PM   #2756
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Quote:
Originally Posted by miamifanatic
how are you guys getting the tire circumference 58mm tires at 182 i like to run my tires at 57mm so how do i find out what the tire circumference is thanks
57 x 3.14
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Old 02-27-2007, 02:42 PM   #2757
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thank you for the help also one more question if i go to run a 19t should i use the same roll out as the stock?
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Old 02-27-2007, 02:55 PM   #2758
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Quote:
Originally Posted by miamifanatic
thank you for the help also one more question if i go to run a 19t should i use the same roll out as the stock?
KD19T is normally the same or 1 tooth over a co27. Other 19T's are different.
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Old 03-07-2007, 01:05 PM   #2759
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moony where do you find the silver and copper solutions. what type of solutions are they? i'm very interested in trying this on my motors and any additional help would be greatly appreciated. thanks
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Old 03-11-2007, 12:48 AM   #2760
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bmi racing website has some info on recopper armature electrolasis
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