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Model Forum / Radio Controlled / Land Models / July 2005Motor Gearing
Ok, here is the deal, I bought a Speed Gems Pro Amber 17T motor to put into my stock Traxxas Rustler with the X1 ESC. The 15T 48P pinion gear I bought didnt mesh right with the spur gear, I just left the stock 18T pinion in the car (later found out that you can adjust the space between pinion and spur. I like the way the car is now though even though it is slightly overgeared, the ESC gets a little hot but the motor and battery stay cool to lukewarm. Is this too much to overgear the motor? From what I can gather the pinion should be 2 teeth less than the turns of the motor so stock it was 18/84 gearing 20 turn motor now it should be 15/84 gearing 17 turn motor but I have it at 18/84 gearing 17 turn motor Just wanted to get some opinions out there, the Traxxas forums seem to all say it is bad when i get answers to my specific question but I did a search on gearing and found some older posts of people using 18 and even 19 teeth pinions with a 17 turn motor and having no problems. The Traxxas pinion is 48p so I can't imagine why it won't fit. You will need to move the motor closer to get the 15tooth to fit since it is a smaller gear. If your just driving up and down the street you could be OK. Hill climbing or tall grass will be much harder and could heat things up. Keep an eye on the heat is all. > The Traxxas pinion is 48p so I can't imagine why it won't fit. > [quoted text clipped - 4 lines] > climbing or tall grass will be much harder and could heat things up. > Keep an eye on the heat is all. Ok, I didn't think just 3 teeth would be that big of a deal, yeah I should move it closer but I'm afraid of messing something up. > > The Traxxas pinion is 48p so I can't imagine why it won't fit. > > [quoted text clipped - 7 lines] > Ok, I didn't think just 3 teeth would be that big of a deal, yeah I should > move it closer but I'm afraid of messing something up. check this out: <http://www.hobbytalk.com/modules.php?op=modload&name=News&file=article&s id=69> >> > The Traxxas pinion is 48p so I can't imagine why it won't fit. >> > [quoted text clipped - 13 lines] > <http://www.hobbytalk.com/modules.php?op=modload&name=News&file=article&s > id=69> That link is broken I think. > >> > The Traxxas pinion is 48p so I can't imagine why it won't fit. > >> > [quoted text clipped - 10 lines] > > > > check this out: <http://www.hobbytalk.com/modules.php?op=modload&name=News&file=article&s id=69> > That link is broken I think. http://tinyurl.com/drw4g > Ok, here is the deal, I bought a Speed Gems Pro Amber 17T motor to put into > my stock Traxxas Rustler with the X1 ESC. The 15T 48P pinion gear I bought [quoted text clipped - 21 lines] > on gearing and found some older posts of people using 18 and even 19 teeth > pinions with a 17 turn motor and having no problems. If the motor isn't blazing hot you're fine. Even if the motor did get blazing hot the worse that could happen is you wear the commutator and brushes out faster. Most current ESC's have thermal protection and they shut down if overloaded so you don't ruin the ESC. I say go up to a 20 and see how hot the motor gets. If it's too hot to keep your finger on it go down to a 19. >> Ok, here is the deal, I bought a Speed Gems Pro Amber 17T motor to put >> into [quoted text clipped - 36 lines] > brushes out faster. Most current ESC's have thermal protection and they > shut down if overloaded so you don't ruin the ESC. Even the stock X-1 ESC? Since it is stock I didn't think it would be that nice of an ESC. The motor isn't even burning hot, but the ESC gets pretty hot, the heat sinks are burning hot but the plastic housing is just warm. Plus it's been about 95 F here this last week or so. How much is a new comm and brushes? The motor was only 32 bucks on tower hobbies site. Some Dirt Hawg tires are next on the list to buy then some rims and a body and I'm set for a while, maybe get a brushless but that will be a long while since I want to get a plane too. > I say go up to a 20 and see how hot the motor gets. If it's too hot to > keep your finger on it go down to a 19. I might do that, I was thinking of getting a better ESC anyway so if I fry this one, no big deal I guess. The motor barely even gets warm actually. I havn't run it full throttle for the whole pack yet though, Ive been kind of babing it since I was told you need to break in electric motors so the brushes sit on the come right or something. You break in electric motors by running it for a minute or so with no-load (not in a vehicle). Your well past the point of worrying about break-in if you have driven it around for a full pack. Go have fun with it! Running part throttle all the time is easier on motor, harder on ESC. When you are part throttle the ESC has to restrict the amount of electricity going to the motor and this resistance causes heat. Try playing with it like you really want to and check the heat. To install a pinion: Loosen the motor screws. Remove the current pinion. Install the new pinion but don't tighten grub screw. Look at the back of the truck and push the motor all the way in, as it would be if the mounting screws were tight. Check gears line up together. Tighten grub screw. Put a piece of paper between the pinion and spur gear. Move the motor so the pinion is against the spur with the paper pinched between. Tighten the motor screws. Rotate gears so the paper comes out. You should have the gears close, but not mashed together thanks to the paper that was in the way. You should be able to just barely move the spur without having the pinion move. It might take more then one try to get it right. Before long you won't need the paper and will do it by sight and feel. Do not over tighten motor screws. The Rustler has a plastic motor mount and it's easy to tighten the screw to much so they pull through the mount, or warp the plastic so that you will only ever be able to mount the motor in one position. As you drive on different surfaces, change motors and do other changes you will want to swap gears so it's a good skill to have. Don't be afraid to try it, worst thing you can do is ruin a $3 spur gear. >How much is a new comm > and brushes? You'd have the comm cut, not replace the armature. Bruches are about 3 bucks a pair. When it's time to get a new motor think about the Orion Revolution or another brand with the same angled brush technology. You get way more runs between motor cuts and brush replacements. > Some Dirt > Hawg tires are next on the list to buy then some rims and a body and I'm set > for a while, maybe get a brushless but that will be a long while since I > want to get a plane too. Remember that if the Dirt Hawg tires have a larger diameter than your current tires there will be more rollout which means the truck may go faster but it may also make the motor run hotter. > > I say go up to a 20 and see how hot the motor gets. If it's too hot to > > keep your finger on it go down to a 19. [quoted text clipped - 4 lines] > babing it since I was told you need to break in electric motors so the > brushes sit on the come right or something. Generally a few minutes of run time breaks in brushes. |
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