motor heat/gear ratio

[9064]

I have been out of R/C for about 8 years. Just got back in. Forgot how much fun it is.

Anyway I have a F/T B3 and I'm running a 81 spur gear 24 pinion just like the book says.
My motor is getting so hot you can cook an egg on it. My ? is what gears are you guys running so that your motors don't get cooking hot. I have seen other guys at the track finish a race and you could still touch the motor it was hot but you could still touch it. I tried running lower pinion gears (17-22) and ti does not help. I even tried 84 and 87 spur. So whats the deal. :mad:

I'm running a LRP V7.1 ESC and a P2K motor with 2400 batteries.

Hog

[Railman]

Wecome back! I would think that a 23 or 24 would be about right. Does evreything spin freely on your buggy? How big of a track do you run on, how long is the staightaway? Do you have full bearings? What springs are you running on the motor? Is your gear mesh too tight? I know you said you ran RC before, & I aploligize if it sounds like stupid questions , but something is missing from the picture & I'm just trying to find it. It doesn't sound like gearing. Let us know. Joe

[9064]

Everthing on the buggy spins free no binding at all. I have full bearings, and I'm using the stock springs that came on the motor.
The track I mainly run on is a short track (no long straightaway) but it is a oval. The straightes are about 25 to 30 feet long. But even when i run on the off road track it is not any better. :(

I clean my motor after each night of racing so I know thats not it. I talk to guys at the track and hobby shop about it and they say the same thing I do after they have look at and drive it, I DON'T KNOW.

Maybe it's just going to be hot I don't know what else to do.

[Railman]

Hogster, I don't run oval. Aren't you at full throttle about 2/3 of the time? If the straits are only 25 to 30 ft you need to gear it down about 2 or 3 teeth. Other than that, maybe a GM3, or MVP might be more suited to running at constant high rpms?

Grizz, does that make any sense to you? Joe

[nsane]

Like Railman said, thats pretty close, I run on a fairly short track and I'm running a 22 on my MVP and when I pull the car after a 5 minute race my motor is relatively cool. I could probably go to a 23 or 24 without issues (but it would kill me on the short track). If nothing is binding, try stripping down the motor and cleaning it well, its possible it has some internal binding due to dirt, etc.

[HauntedMyst]

Is the gear mesh set properly? I had my TC3's too tight and it would heat up like a chernoble worker during an argument.

[Railman]

Hogster, The only other thing I could think of is that the motor itself may not be spinning freely. Check the end play to see if the arm is centered in the mags, & then take it apart & check out the bushings. Sometimes they are not set all the way. Take a wood dowel or an OLD arm & make shure the bushing is seated all the way, & that the arm runs free. Are the magnets rubbing the arm? Are running abs on your radio? Are you shure the wheels aren't binding the wheel bearings? Sorry I can't suggest more, I'm at a loss. Joe

[9064]

Whats really pissig me off is my 12 year old TQ10 (first all graphite RC10) handles better and is faster with a old double trouble Losi motor. But I've only had the B3 for two weeks. Mybe I just need more time to get use to it.

The mesh is fine. Like I said I'm not new at this it's just been a while give me some credit :)

I have had the motor apart many times everthing looks OK. I guess it's just the oval. But it still gets way hot on the off road to. I don't know I give up I'm just going to drive the piss out of it and when the motor bruns up I'll just get a new one :p

Thanks for the help guys
Hog

[HowieStern]

Team AE has changed their suggested gearing for "racing" stock motors... they no longer recommend running a 24, but instead a 20 pinion.... you can check www.rc10.com (http://www.rc10.com) to see for yourself....

peace out..... :)

[Railman]

Thank's Howie! It's about time they changed their recomended ratio. The old recomendations were for motors that did not have the effective timing advance of todays hybred stock motors. Maybe there will be fewer arguements about the gearing topic now!
:cool: Joe

[Railman]

Howie, I just wnt there & looked at the B3 & T3 recomendations & for stock they recomended a 24 for the B3, & 24 for the T3, How odd! Thats reasonable for the buggy, but the final ratio for a T3 should be 2 points lower (higher number) than a B3! :confused: It's not right! Anyway, where did you find the new recomended ratios?
:confused:

[ 08-28-2001: Message edited by: Railman ]

[RichieRich]

I don't see it either. Here's what I found. This link recommends a 20/81 for a P2K. <A HREF="http://www.rc10.com/racerhub/techhelp/techbuggyset.htm">Click here</A>