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Old 06-03-2006, 02:07 AM   #1
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Default BK1 gearing

I am attempting to set my BK1 up, I have a GT7 ESC, an Orion v2 11x2, and an 82 tooth spur gear, what pinion should I start with? Should I go off of the BK2 set up, or the XXXCR set up? This is confusing, I think I ran a 17 but it was a long time ago, THanks,
Rod
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Old 06-03-2006, 02:14 AM   #2
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Never mind, found the bloody manual, but to get a similar ratio, I am between a 19 and 20, WAY closer to 20, (19.95 IIRC). The 19 will make it quicker, I will be turning about a 4:11 before the final ratio, making it a final drive of 10.4, should I gear it so that it comes close to a 9.477 like the manual suggests? If I use a 21 this is exact.
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Old 06-03-2006, 02:17 AM   #3
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No!, 19 or 20 is to high, never follow the manual, its wrong. Like even in a associated t4 manual says to start with like a 21 or 22 pinion in offroad, but you actually need a 17-18, motor gets to hot

start with a 17, check motor temp after 5 minutes at reac speed, you can get your motor around 160 for offroad, if its like 130-140, gear up, but it also depends on if your making runtime
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Old 06-03-2006, 02:52 AM   #4
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Cool, thanks, going to put on a 17 or 18, cause I am not sure what all I have, what about a 16?
Thanks,
Rod
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Old 06-03-2006, 09:14 AM   #5
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Can you slide the motor far enough forward to get a 17 on it? The bk1 trans gets in the way sometimes.
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Old 06-03-2006, 11:16 AM   #6
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Gear it with a 19 pinion for V2 (8 over the turn) motors unless if your track is really small/large. If you run a Trinity/EPIC typs of motor then gear it 9 over the turn.
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Old 06-03-2006, 09:49 PM   #7
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The 17 fits PEFECTlY, just the right amount of mesh, I did not get to run it do to the buggy sitting on the bench for 5 months and I lost the servo mounts, DOH, so have to wait until next weekend. Anyhow, so with the Orion Revolution, which I am assuming is a V2, since my other V2 looks exactly the same, I shoud run a 19t pinion, with the 82 spurgear? I have a 78, I think somewhere, would that be better? It does fine with the 82, I ran it at a large regional race last fall and took 5th out of 9, and it was the first time I had ever driven that car.
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Old 06-03-2006, 10:28 PM   #8
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Dont just go on pinion and spur gear, you gotta factor in motor temp, like different brushes, spring combos, track service takes a factor in

You want the motor around 160-170 degrees, if your running a 17 pinion and w/e spur gear now and it fites just enough, and the motor is to hot, you will have to go with a bigger spur gear to be able to gear down

Make sense?
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Old 06-03-2006, 10:30 PM   #9
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Quote:
Originally Posted by SlobbaTech
Gear it with a 19 pinion for V2 (8 over the turn) motors unless if your track is really small/large. If you run a Trinity/EPIC typs of motor then gear it 9 over the turn.
Not true most the time
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Old 06-05-2006, 11:01 AM   #10
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So I must have been gearing my motors incorrectly for the past 5+ years??? I guess everyone has their own way of doing things and if gearing your motors fairly low works for you then great but it soudns wrong to me and not by a little either but by a lot...I don't want someone to burn heir motor up from faulty info. Just of all the national + world level races I've been to while using V2, YOK, or EPIC type motors my 1st hand gearing experiences have been correct and also knowing what my other Losi team mates gear their cars it along those lines as well. For XXX(BK1) + V2 motor gear 8 over the turn using 78T spur. So with a 12 turn moor you gear 20/78, for an epic based motor gear a tooth higner for that car/tranny, for BK2 gear one tooth higher as it's tranny ratio is different.
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Old 06-05-2006, 11:58 AM   #11
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On a BK1 motor plate, I would like to know how you got lower than a 21T pinion to mesh with a 78T spur...I can't slide the motor any closer. To use smaller pinions I had to go to an 82T spur.
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Old 06-05-2006, 12:25 PM   #12
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I dont have a 78 tooth, I have an 82 tooth, and all teh info I am getting is for a 78, kind of weird. But with a 78 the 17 fits with the right amount of mesh, if not a hair too much. So, should I figure out the ratio from teh gearing you guys are all suggesting for 78 and convert it into the 82 tooth specs?
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Old 06-05-2006, 01:49 PM   #13
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i run 19/86 on my bk1 with a v2 10x2. trhat wouls be very close to 18/82. i also run a 12x2 v2 and i gear it at 21 /86 so i would say run a 19 with the 82 spur for a 11x2
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Old 06-05-2006, 09:32 PM   #14
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For a 78T spur to run lower than a 21 pinion you need to dremel the motor screw slots further forward until the motor(without a pinion on it) will make contact with the tranny case. I think you can run down to a 19 pinion with a 78T spur after doing this. For every 2 teeth on the spur geae is pretty much the same as one tooth on the pinion gear. So if you want to gear the "same" as say 21/78 you should go with something like 23/82 and maybe tweak it a litle on feel from there on out.
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