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Old 11-07-2002, 06:19 AM   #4291
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I am using a 68 spur with 27 pinion, i.e 4.61 !

In Malta ... only my own a competitive LOSI, the others race with MR4s or TC3s ...
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Old 11-07-2002, 06:31 AM   #4292
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no.. ignore the ratios i mentioned, they are for 27 turn motors.

stick with the ratios the fast guys at your track are running.
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Old 11-07-2002, 06:41 AM   #4293
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Two 42T pullies ... 1.83 gear ratio
One 41T pulley ... 1.78
Two 41T pullies ?
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Old 11-07-2002, 07:36 AM   #4294
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thanks for the help Doug...

Senna, you should just be able to divide by the number of teeth on the idler gear I assume. Working backwards from what you said (42 teeth*2 = 1.83) should mean there is 23 teeth on the idler gear, so 41 / 23 = 1.78.
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Old 11-07-2002, 08:10 AM   #4295
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Thanks man ... for the clarifications ...

Is there a way how you can tell how much you can gear a 21 turn Stock Motor ?
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Old 11-07-2002, 09:26 AM   #4296
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Senna.........Mark,

To find out the new internal ratio devide the diff wheel (41) by the number of teeth of your lay gear. I don't know it off hand.

I tried going from 4.6 to 4.5 on my Yoke and my times have come down again.

Regards

Joe.
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Old 11-07-2002, 12:12 PM   #4297
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Default Castor blocks

Can anyone tell me if when changing castor, the carrier and spindle comes as a set, is the castor built into the carrier only or is the spindle part of it also. If I were to use the AE castor carrier what precautions should do when using them.
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Old 11-07-2002, 12:38 PM   #4298
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da4head - although the castor blocks and front steering hubs come as a set, the hubs themselves do not have any castor built into them. The castor is defined by the castor block. I guess I'm curious as to why you'd want to use AE C-hubs on your Losi. Heck, even some of the AE guys use Losi hubs on their car.

Internal Drive Ratio - the formula for internal drive ratio is pretty simple. Take the number of teeth on the diff pully (41 or 42 on the Losi) and divide it by the topshaft/layshaft gear (23 on the Losi) and this will give you the internal ratio of the car.

42/23 = 1.8260.....
41/23 = 1.7826...

In the case of overdrive using a 41 front and 42 in back, about as close as you are going to get is to use 41.5/23 = 1.8043... But this isn't necessarily accurate because of how each axle rotates at a different speed. If the front is definitely pulling and the rear has to scrub to keep up, then the 41/23 is probably closer to accurate. I think the difference in internal ratios is small enough to just use 41/23 when using overdrive.
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Old 11-07-2002, 01:02 PM   #4299
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It seems that our LHS is having difficulties in bringing in the castor blocks, I've ordered them 2 months ago. However the store has an abundant supply of AE castor blocks. Can I make them work??
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Old 11-07-2002, 01:07 PM   #4300
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Senna - it is pretty normal to have those belt marks on the inside of the bottom cover. This primarily happens when you are slowing down or braking. When you use your brakes, the belt tension moves to the top of the belt and the bottom of the belt has more slack in it so the belt can droop depending upon how tight your are running it. With this droop, the belt can rub on the bottom cover. This is really pretty insignificant to the car's performance. During accelleration, the tension moves to the bottom of the belt which lifts the belt pretty far away from this bottom cover.

Also in some belt driven cars, you can get vibration in the belt at high speeds. Again, this is a possibility but usually happens to the side of the belt with less tension.

As far as rotating mass is concerned, you aren't going to see a difference using the 41t gear. The weight of the bearings, axles, tires, and even the belt are much more significant. The difference in weight between the 41t and 42t are almost unmeasurable with respect to rotating mass. I'm not saying that rotating mass isn't important, the the diff pulleys are very light. Friction is a bigger enemy to speed. Keeping your car rolling freely and efficient are more important in my opinion.
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Old 11-07-2002, 01:32 PM   #4301
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da4Head - perhaps your hobby shop has failed to order them. The Losi castor blocks are readily available. There are lots of online hobby shops that have them as well. If you cannot get them, email me at the below address I'll help arrange to have some sent to you.

I'm not sure about using the AE blocks but I'm going to assume that you could make them work if you had to. Like I said before, I know that you can make the Losi hubs work on the TC3 so I don't see why you couldn't do the reverse.
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Old 11-07-2002, 07:26 PM   #4302
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you have to cut out some of the material if you use the AE hubs. We had to do this early on when the Losi came out because 4 degree blocks weren't out from Losi yet. The cvd won't fit through the AE castor blocks unless you shave it a little.
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Old 11-07-2002, 08:11 PM   #4303
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You can't use the AE castor blocks without modification.
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Old 11-07-2002, 08:37 PM   #4304
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And you have to stop the excess throw by adding a washer between the block and spindle. .
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Old 11-08-2002, 01:32 AM   #4305
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Is the front ONE WAY heavier than the STANDARD DIFF. ?

Are lightweight (or better than standard) bearings available for the LOSI XXX-S ?
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