HPI Havoc

iTrader: (5)

Ok guys here is the deal...and just to clarify I'm not new to RC. This is what I have...

AE RC8 RC Monster Brushless Conversion
Mamba Monster 2200KV
Hyperion 5000mah 4S 35C
Diffs 5 7 3
16T Pinion
48T Spur

and the issue...

My temps are topping 220 degrees

I had this exact set up in my SC8 brushless conversion and was temping around 170.

I had an 18T on the RC8 and dropped it to 16 to find the sweet spot and still really no change, tonight i hit 230!

I've dropped the timing on the ESC to 0 degrees and still hitting 200-210.

WTF is going on? I'm seriously confused, i have a buddy running a Vorza with the same damn setup and he is temping around 160's, the diffs were recently rebuilt, bearings are good, everything is smooth.

I'm running a AE RC8e body with a Upgrade wrap, i do have some air vents but not the front window cut out, could that really make that big of a difference?

Thanks for taking the time to read this...i just dont want to end up with a $300.00 paper weight

Bobby

bohdi

iTrader: (12)

Is your mesh too tight?
have you tried 17T pinion?
Does it feel like there is drag brake on?

HPI Havoc

iTrader: (5)

Thanks for the reply bro.

Mesh is perfect, I've only tried the 18T and 16T neither one really had any change, no drag brake at all, rolls real smooth.

When i had this in my SC8 I had a metal spur but i can't remember the number of teeth, i'll have to check with AE, but i'm wondering if thats my issue.

Granted I'm running in AZ were its 100 degree's at night, but like I said I've got buddies running the same set up and they are between 140F-170F

Jason Haas

In my losi 8 I run a 16 48 with a 2200. The AE diff gears are set for more punch then the losi. I would try like a 18 to get the the same final drive gear ratio.

HPI Havoc

iTrader: (5)

i had an 18T in it and still had the same issue last night i went to the 16T and really saw no change in temps, just lost a little on top end.

Arigato

iTrader: (1)

Try a 15t pinion. Now that it's hot outside (I live in 'Vegas) I've had to gear my rigs down a tooth or two. As long as the drive train has no binding issues, the only other thing I can think of is maybe there is a bad bearing in the motor itself creating drag.

HPI Havoc

iTrader: (5)

I'll try the 15T, mod 1 pinions are so damn expensive it sucks! lol.... i never thought about the motor itself being the issue. I wonder if castle can data log it to see how hot it has gotten and tell me to pound salt and no warranty i'll email them and see what they say... that a very good point thanks for the info!

R40Victim

iTrader: (1)

How's your battery? As the voltage goes down, the temps go up...

havatitan

iTrader: (2)

Have you ever checked the motor bearings? contrary to popular belief brushless motors are not maintenance free, you have to pull the motor apart every few runs and check the bearings and clean out the can. A gritty or tight bearing can generate a ton of heat very quickly. Sorry to say that if your motor has hit 200+ deg it's done, The magnets on the rotor are starting to demagnetize, and will continue to run hotter than normal.

morgoth

Does your shaft has any play? Do the bearings roll smooth? Open your can and spin them in your hand to check if they are still in shape.

What diff ratio has the RC8? Standaard buggy or truggy? How fast are you geared?

scarletboa

iTrader: (4)

after running that hot, your rotor is most likely toast.

what you need is a castle motor repair kit. they are only $25 and include the rotor, bearings, front endbell, and the little spacers that go on the shaft.

HPI Havoc

iTrader: (5)

shaft has minimal play, i have disassembled the can as its still under warranty. It was a Factory Team RC8 buggy, it now has the rc monster brushless conversion. the gearing is 4.3:1

HPI Havoc

iTrader: (5)

my lipo cut off is set at 3.2v per cell rather then the standard 3.0v per cell so it doesnt ever slow down it just hits the cut off and i'm done, easier on the esc and motor and will save my lipo's

HPI Havoc

iTrader: (5)

thanks bro, ill pick it up asap

brickshouse

iTrader: (7)

i had the same prob, running 2050 tekin though, geared 16- 46 rc8e. Everyone said i was undergeared, went to 18, then 20. Your right, hard to spend $13 on a pinion especially when you dont know if it will work. Mine was running anywhere from 165-195, fellow racer with same setup was hitting around 140 if my memory serves me correctly, dunno, all my bearings on car and motor where checked oiled nothing bound. Had esc programmed the same as well, me or him couldnt figure out why it was running so much hotter....everthing was the same??!!