information on kb45 motors?

[_paralyzed_]

Originally Posted by Nixpus

Will be testing the KB45-08XL in a converted savage soonish... on 6 cells of course. 35k rpm sounds pretty reasonable.

I smoked mine in 5 minutes on 6s in an e-maxx. agwut has a lot more experience than anyone with kb45's and he recommends 25k rpm.

Whatever you do, keep watching the temperature.

[aqwut]

Originally Posted by _paralyzed_

I smoked mine in 5 minutes on 6s in an e-maxx. agwut has a lot more experience than anyone with kb45's and he recommends 25k rpm.

Whatever you do, keep watching the temperature.

yeah, I know for a fact..
the 1700KV one runs awesome on 4S..
the 1000KV one runs awesome on 6S...
and the 700KV one runs awesome on 8S...

So they're are all about 20-25K range...
You could run them all day long with a heatsink and/or fan...

The ones that died on me where running about 40-45K rpms.. They don't seem to mind the amp draw, they just don't like the RPMS...

My favourite is the 1000KV, insane for showing off on 8S.. 700KV same thing on 12S...

[aqwut]

Originally Posted by Nixpus

Will be testing the KB45-08XL in a converted savage soonish... on 6 cells of course. 35k rpm sounds pretty reasonable.

I would use the 1000KV for 6S and just gear it higher...

[scarletboa]

i think the 1200kv would be better for 6s. that's less than 30k rpm. my 8xl (1600kv) ran 140-150F whenever i ran it with 85F ambient. that was with a stretched traxxas heatsink and the kershaw motor mount. that was on 6s with a $27 plane speed control. the hottest i temped it at was 160F after a 10 min. run with the gear mesh WAY too tight due to the motor mount shifting. it ran around 145F most of the time during my street bashing.

[aqwut]

Originally Posted by scarletboa

i think the 1200kv would be better for 6s. that's less than 30k rpm. my 8xl (1600kv) ran 140-150F whenever i ran it with 85F ambient. that was with a stretched traxxas heatsink and the kershaw motor mount. that was on 6s with a $27 plane speed control. the hottest i temped it at was 160F after a 10 min. run with the gear mesh WAY too tight due to the motor mount shifting. it ran around 145F most of the time during my street bashing.

Awesome.. glad it worked for ya.....

[scarletboa]

Originally Posted by aqwut

Awesome.. glad it worked for ya.....

yeah, until the rotor separated from the shaft. that happened one run after i put loctite on the endbell threads, so now i can't get it open.

i can't say anything about the 1400kv L length motor yet, but i hope it works well once i get my EZrun back from nitrorcx.com..

[Nixpus]

At the moment my savage is powered by a Hobbywing 4465... its way too powerfull for the truck.

Was hoping the KB45-08XL would be easier to controll. However, when I read Scarlets conversion thread it seems like its just as impossible as the 4465 :)

If 25K rpm is the limit for the KB's then the 10XL sounds just about right - 26.600 on 6 cells.

Will a lower KV motor be easier to controll (wheelie/backflip wise) or will the increased torque mean that it wheelies more. I mean if I geared for about 45mph will a 1200KV motor then be easier to handle than a 2000KV? And why?

[aqwut]

Originally Posted by Nixpus

At the moment my savage is powered by a Hobbywing 4465... its way too powerfull for the truck.

Was hoping the KB45-08XL would be easier to controll. However, when I read Scarlets conversion thread it seems like its just as impossible as the 4465 :)

If 25K rpm is the limit for the KB's then the 10XL sounds just about right - 26.600 on 6 cells.

Will a lower KV motor be easier to controll (wheelie/backflip wise) or will the increased torque mean that it wheelies more. I mean if I geared for about 45mph will a 1200KV motor then be easier to handle than a 2000KV? And why?

25K is not the limit, I have ran the 1700KV motor on 8S, and it was insanely fast... I recommend somewhere around the 25K mark.

Example, 1200 KV and 2000 KV motors of the same size.. Powering a Monster Truck...

They both have the same power output.. with the lower KV you have to gear higher and use more voltage, and with the higher KV you'd have to gear lower and use less voltage.

I prefer to use lower KV and higher voltage & less RPMS.. but there is a limit..

Lower KV motors can't take as much amps as the higher KV.. the Lower KV relies more on Voltage.. whereas the Higher KV motors relies on Current. know what I mean?

[scarletboa]

is there any way to make an adaptor to mount these motors where normal 25mm bolt pattern motors go? that would definitely help make these motors become more popular. the 6mm shaft is easily ground to 5mm, but the bolt pattern is the real problem. i know it can be done, all you need is either a new front endbell or an adaptor that screws into the endbell, kinda of like that one RCM medusa plate thing.

[ghostriderlund]

Hello. i dril new holes to motor on rustler gearbox.
but you can take of front of motor and drill and tap new stock 25mm apart screw holes. that i have done to some of my motors.
yes i think the 2300kv L is more powerfull than castle/neu. but castle/neu 2200 runs cool on 8-9cells lipo and have a huuuge margin for sweetspot so its really a much better motor. but for speedruns i wil always put my money on the kb45 2300kv.i have actually downgraded my rustler to the castle neu because it kept wheeling at 140kmt because i run out of space and had to push harder on the trottle to max it out. with the neu its a bit lighter and its easyer to control on trottle.
here is some of my cars. remember im in to speed and not bling bling. dont care how it looks it just have to be fast and do the job :
http://www.rcgalleri.dk/html/alb_vis.asp?AlbumID=4486

http://www.rcgalleri.dk/html/gal_vis...8100&ipc=96645
i have added much more downforce to the speedrun rustler but havent gotten pictures yet
this video is with a smal motor that i also put in alot of lipos : and it gets to free rev at a time because it loses the pinion. it spins at 90.000rpm
its the turnigy 2600kv 36/56. when i get more time to get my rustler dialed in with the castle neu and then with the kb45 2300kv i will do a record attemt
http://www.rcgalleri.dk/html/vid_vis.asp?VideoID=8217
best regards from kristian

[florianz]

wow, great car!

I once had a kb45l, but getting the axle down to 5mm was not that easy.

a feigao 580l would be an alternative, with a 5mm axle. supposed to have a higher efficiency then the kb. but, in my opinion, the kb have at least a much better quality then these cra++y kd, eg. the magnet is balanced.

[scarletboa]

getting the shaft was pretty easy for me and i'm practically a novice. all you need to do is run the motor while filing the shaft down.

[florianz]

Originally Posted by scarletboa

getting the shaft was pretty easy for me and i'm practically a novice. all you need to do is run the motor while filing the shaft down.

maybe they have different shafts. I tried it that way... brought it to the shop later and had it done. the guy said it was not easy, as the material was very hard...

[scarletboa]

i got my m4 screws from ace hardware. not too hard to find......

[sikeston34m]

Today, I ventured out into the snow and went to the local Lowes. I couldn't find the hex head countersunk m4 screws, but they did have some phillips head. So I got those.

After much work on the aluminum motor mount in the E Revo, things began to fit.

The 25 tooth Mod 1 pinion needed about 1/8" of metal removed to clear the teeth with the motor in position.

This motor is HUGE! KB45 10XL 1200kv

Geared 25/40.

This is geared for speeds like:

4S = 36 mph
5S = 45 mph
6S = 55 mph

I have a feeling it will work well with anything from 4S to 6S, but we'll have to see about that.

Everything fit tight, but it did fit like a glove.

Check this out!