STANG KILLA SS
~THE SCALE SHOP~
Hey Tommy whats your track width?
-
Welcome to RCCrawler Forums.
It looks like you're enjoying RCCrawler's Forums but haven't created an account yet. Why not take a minute to register for your own free account now? As a member you get free access to all of our forums and posts plus the ability to post your own messages, communicate directly with other members, and much more. Register now!
Already a member? Login at the top of this page to stop seeing this message.
Tommy R's TTC Build - "Big Oly"
- Thread starter Tommy R
- Start date
Tommy R
I wanna be Dave
I was out of town since Firday, but I'm back and today is dedicated to getting the rig 100% D-O-N-E! Motor/trans is out now. The entire drivetrain from the t-case through the axles is silky smoove. Definitely no issues or binding there. The trans spins very freely, but it looks like the input shaft has a very slight out of round condition. It's not bad, though. Spur gear even looks perfect. I'll see about getting a new one before MSD, just in case. I'm gearing down from a 54/14 combo to 54/12. I understand these pullers don't like to be overgeared so maybe this'll help with the temps. Hate to loose that wheelspeed, but I think it'll be okay (3.86:1 vs. 4.5:1). If the hobby shop has a 13t (4.15:1), I may try that instead.
More updates and pics later. And Cory, I'll get you the overall track width then.
More updates and pics later. And Cory, I'll get you the overall track width then.
Tommy R
I wanna be Dave
Like this?
It does allow easier breathing than the coffee filter I'd planned on using. I tested by breathing through each of them! :ror: My only concern is if the fibers get caught up in the spinning bits, but I guess chances of that are pretty low, huh?
Tommy R
I wanna be Dave
Took the truck out for another test on my backyward course and after about 8 minutes of crawling it lost power from the motor. Worked great until then. Motor feels hot again, but no pyrometer. I can hear the motor trying to turn when I apply throttle, but nothing happens. I can also smell that "hot electrical" smell. All other truck functions work great.
I can't imagine doing this, but I guess I need a motor to replace this puller. ASAP. I just need to determine what to go with. I need to keep this ESC for now so it'll need to be brushed. Suggestions? :roll:
I can't imagine doing this, but I guess I need a motor to replace this puller. ASAP. I just need to determine what to go with. I need to keep this ESC for now so it'll need to be brushed. Suggestions? :roll:
STANG KILLA SS
~THE SCALE SHOP~
ive got a couple HH 45T prowounds your more than welcome to use. brand new. if your in a time crunch.
in fact ill be in austin tommorrow
in fact ill be in austin tommorrow
ecoli
I wanna be Dave
When did you last replace the brushes/cut the comm on the motor? Might be part of the issue.
If you don't get another motor before heading out, I'm sure they'll have something in stock at the Hobby Garage. Hell, even taking a stock Axial or silver can can at least keep you running for the day.
Sucks that this is happening this close to nats. Hope it all gets sorted out for you "thumbsup"
Tommy R
I wanna be Dave
Thanks, Cory! I'll definitely let you know and I appreciate the offer.
I replaced the brushes during this rebuild. I didn't cut the comm, just cleaned it. I set the timing and it seemed to be fine....no sparks or anything. But today it started acting like it was thermaling or something. After about an hour I started doing some troubleshooting and I was able to get the motor running again. I took it outside to run it and it seemed sluggish compared to earlier. Then I noticed a wiff of smoke. It was coming from the motor so I cut it off.
I believe this motor is toast and will need to go back to Holmes for a rebuild. I've got access to a new 7t and a new 10t puller. So I'm now trying to decide between 7t on 3s or 10t on 4s. I may even play it really safe and run 10t on 3s, but it'll be lacking wheelspeed. Not sure which route I'll go yet....
STANG KILLA SS
~THE SCALE SHOP~
ive got your puller and pro wound packed. see ya tommorrow. id REALLY like to see you try a 540.
Tommy R
I wanna be Dave
Thanks, Cory! Chances are I'll pick up that 45t from you tomorrow, but Patrick has a new 10t puller that may find it's way into Oly. But please bring both with you just in case.
Tonight I removed the motor and took a look inside. I think something is wrong here!
The other side.
And there was this dusty residue outside the can, too.
I don't know what happened. Maybe it had something to do with my rebuild? Maybe it simply got too hot? I really don't know, but needless to say this motor will NOT be powering Oly next week.
dezfan
I wanna be Dave
That sucks, the epoxy on the windings look discolored and if your seeing smoke, it's probably toast.:x
team3six
www.team3sixrc.com
Holy he'll man, how many times did ya run that beast before you put new brushes in it?
looks like it hasn't seen a rebuild since ya got it.
im guessing the residue of dust is metal and carbon, and the can got so hot it melted the epoxy from the winds.
Just in case, i have a tutorial on maintaining motors. I hope im not coming off mean at all, but I always clean and check my motors after a comp. They cost too much money.
Very cool of Cory to hook ya up. He's a good man.
looks like it hasn't seen a rebuild since ya got it.
im guessing the residue of dust is metal and carbon, and the can got so hot it melted the epoxy from the winds.
Just in case, i have a tutorial on maintaining motors. I hope im not coming off mean at all, but I always clean and check my motors after a comp. They cost too much money.
Very cool of Cory to hook ya up. He's a good man.
Tommy R
I wanna be Dave
Yeah, man, I'm pretty bummed. Not like I wasn't stressed out enough already!! :ror: I'm sure one way or another I'll get it sorted....it just may break the bank to do it!
dezfan
I wanna be Dave
Yeah, man, I'm pretty bummed. Not like I wasn't stressed out enough already!! :ror: I'm sure one way or another I'll get it sorted....it just may break the bank to do it!
I have a spare mini puller, but unfortunately I don't have one of the big boys. If I did, you would be welcome to borrow it for MSD.
Good luck finding a replacement."thumbsup"
Tommy R
I wanna be Dave
Well, the motor has had VERY little run time since I bought it new from Cory some time back. I'd say maybe a total of 1-2 hours of run time with no water/mud and minimal dust. Then I put in the new brushes (very recently), but I couldn't cut the comm 'cause I don't have a lathe. So I cleaned it as best I could with a comm cleaning "eraser". It's the only maintenance I could do, unfortunately.
The comm did look bad, but it looks worse after today's catastrophe.Here's another pic of the comm.
I just need to determine what motor/battery combo to run:
7t on 3s
10t on 3s
10t on 4s
I think 14t on 4s may be a great combo, but I don't have access to a 14t before I leave for Nats on Thursday morning.
Dez, just saw your offer and I do appreciate it! But yeah, I'd better hold out for one of the big 'uns.
Tommy R
I wanna be Dave
I spent a LOT of time researching motor options last night. For now, I need to remain with brushed motors. Obviously, availability is also a VERY key concern.
The 10t puller is marginal on a heavy rig running 4s so I was hesitant to get another. Sure, I could run it on 3s, but I don't know if it'll generate enough wheelspeed. However, a 14t puller can run 4s without issue. I spoke with John at HH and he's overnight one to me. This is good 'cause it'll allow me to continue my plan to run 4s for this event. In fact, this motor is also rated for 6s so I may run 6s for events like the truck pull and mud bog where power is king. :twisted: Time is running tight as h3ll, but I'm feeling better about things today.
I'm damn near bouncing off walls I'm so excited about this trip! :ror:
The 10t puller is marginal on a heavy rig running 4s so I was hesitant to get another. Sure, I could run it on 3s, but I don't know if it'll generate enough wheelspeed. However, a 14t puller can run 4s without issue. I spoke with John at HH and he's overnight one to me. This is good 'cause it'll allow me to continue my plan to run 4s for this event. In fact, this motor is also rated for 6s so I may run 6s for events like the truck pull and mud bog where power is king. :twisted: Time is running tight as h3ll, but I'm feeling better about things today.
I'm damn near bouncing off walls I'm so excited about this trip! :ror:
War Pig
I wanna be Dave
I have a spare 7t puller that I'll throw in with all my other stuff just in case you need it....you will be driving Oly next weekend.
Tommy R
I wanna be Dave
You're a good man, Tim!
I also will have a spare back up 10t, but I certainly appreciate the offer. And don't worry.... Come hell or high water, Oly will definitely be running this weekend! "thumbsup"The 7T puller on 3S would be a killer setup. That's what has been in Pepe since 2009 and I recently put that setup in Guido. I really like the wheelspeed. "thumbsup"
The 10T on 3s is 19980 rpm.
The 10T on 4s is 26640 rpm.
If the estimate of 1000-1200 kv is correct, then the 14T on 4s will be 14800 -17760 rpm so you will be slower than you want to be.
You will need at least 6s with the 14T to get 22200-26640 rpm.
The 7T on 3s is 31080 rpm but you gotta watch the heat or gear down a bit.
The 10T on 3s is 19980 rpm.
The 10T on 4s is 26640 rpm.
If the estimate of 1000-1200 kv is correct, then the 14T on 4s will be 14800 -17760 rpm so you will be slower than you want to be.
You will need at least 6s with the 14T to get 22200-26640 rpm.
The 7T on 3s is 31080 rpm but you gotta watch the heat or gear down a bit.
Tommy R
I wanna be Dave
I looked, but couldn't find any speed ratings for the 14t. John has posted a couple times that it's what he would recommend, though. Looks like I may be disappointed in the wheelspeed. I guess I can gear it up a bit, but at least I'll have the option to run 6s.
Thanks for the info, Chris!
Thanks for the info, Chris!
Tommy R
I wanna be Dave
Paying for overnight shipping for a motor so you don't have to thrash on your rig the night before you fly cross country doesn't do much good when it's not delivered to the post office before their cut-off time. :roll: Now my motor won't be here today like I needed it to be. Looks like tomorrow is going to be a mess trying to get everything built, tested, and then packed. $&%@%#@!!!!!! Sorry for bitching, but I needed to vent.
