b4 5.5 turn motor what size pinion gear
 

hi i got a b4 off here rtr 5.5 turn motor with 81 spur gear and 20 pinion it been run fine for a while and today i tested it as it was setup and after about 8 mins it was over heating ,but i can normal use all my battery till it goes flat. any help would be good
i am using a ezrun esc and 5.5 turn motor

Why do you have to run it until flat? Recomended storage for lipo's is 3/4 charged I think.

Sorry. Ignore previous post - I see you've edited it!

its been fine up untill now just keeped cutting out and no signal

Were you doing anything differently? I know you've mentioned before you run it through wet grass. maybe the grass grew taller, and thus has increased drag?


Have you changed the brake settings? I know you mentioned before that you were having problems with the brake settings on the ESC, when the brake settings are set higher they normally increase the load on the ESC and can result in higher temperatures.

Have you considered maybe venting the ESC with small holes in the shell? Sometimes a good idea is to cut a decent size hole, and then put some fine mesh across; this stops debris entering the chassis.

Julius.

yes i changed the brakes to full power no drag on it and the back end lock up when you hit the brakes. but apart from that just solder a wire that had come off that it ,but the grass was a bit wet and a bit of mud but the car was still ripping the grass up:confused:

Surely a 5.5T is too much for a EZ run - probably themalling

5.5 in a B4 is going to be a bit much too..

Thought you were selling it???? :confused:

id say too hot a motor , is its this speedo http://www.hobbycity.com/hobbycity/s...verse_programm.)? you only got 60 amps, its try running for 5 mins , it will get hotter the longer you run

its been fine till today that a turnigy esc not ezrun but looks the same its up forsale with loads of parts a bargin

I thought the B4 was up for sale :confused:

You chop and change so much. Stick with a car a develop it and learn about it and the electrics.

I've run the same motor and ESCs etc. all summer season. I know exactly what to look out for and so on.

Get a 7.5 or 8.5 for the B4 (if you are keeping it)

its up forsale need the cash

Hang on so you are still running a car that's up for sale.... :thumbdown:

Sorry, but when I put something up for sale I don't use it so that's condition isnt' compromised etc. and the seller knows what they are getting.

If it's up for sale, clean it and put it to one side etc.

i tested it for the last time today its all been cleaned etc take a look there loads of spares and gears with it etc

Should we be advising people not to purchase it then?


It sounds like you tamper with things too much.

I don't think it's good morals to sell something that could potentially have a problem. If I were you; you should either attempt to solve the problem, or list it as temperamental.

Julius.

it runs like a dream it just over heated that all pal. i had sorted it out ok with you

I thought there was a problem with the diff/drive shaft :eh?: --> http://www.oople.com/forums/showthread.php?t=32764 has this now been fixed?

its all been done ready to race up forsale bargin with all the stuff loads :woot::thumbsup:

back on topic

i run a 8.5 in my cat sx on 54/85 gearing, hope that helps

your funny that good gearing nothink to do with a b4 pal

what he is saying stampy is a 5.5 is way too much for a b4

that what the guy was racing it with si coe

actually Mark, i was trying to impersonate the usual advice that Stampy gives out and see if he likes getting completely wrong advice. I guess he doesn't.

But your point is equally true, 5.5 in a B4 is a handful for anyone

I was told that Neil Cragg ran a 7.5 in his B4 at Worksop last series. If a 7.5 is fast enough for Neil then its fast enough for anyone. 5.5 in 2WD will just take the fun out of the driving i reckon.

Is it a eazyrun 5.5turn motor with cooling ribs around it?

If so it's a 480 sized motor instead of a 540 size. This means you can't compare it or ask anyone advice on it either because noone runs that size motor. Your MadRat and your B4 have the same internal reduction, so if you already know how to run it in the madrat gear it the same for your B4.

Otherwise you could always do what other people do and time your runs. If your speedo is boiling after 4 minutes you are too long and if it reaches top speed immediately it's too short.

By the way my BMW read differential has a final drive ratio of 4 in 1 hot exhaust. Do I have to squish a Banana on my left front tyre to make my fuel tank into a pram? What happens when I unscrew my bellybutton.
Wibble wibble...

i have no idea what you started on about there Sparrow, but that last paragraph made it all clear! :P

take it up with si coe it came with it car he told me he raced it a bury all the time i was asking about gearing it not a arguement guys ask si coe at bury

sparrow its the same size can as my mamba motor mate

its a 6000kv motor

Its a full 540 sized motor

Actually I used an LRP X11 7.5t with an Orion esc when I had the car. The Ezrun 5.5t lived in my D4. When I sold the car I offered it with a 9T motor (one of the 380 sized finned ones) but that idea was deemed to slow so I offered the 5.5t instead.
I only raced the B4 one time with that motor/esc combo. It was a bit wild as I warned you it would be, but drivable. The Ezrun 5.5t is only really equivalent to others 6.5t's anyway, and a few people use them in 2wd.
In any case the gearing I supplied it with (can't remember now but suspect it was an 18 tooth pinion) was correct being the same ratio as had been successfully used with that motor in my D4 all summer.

its a 20 pinion simon

i ran with 5.5 novak with my old b4 ft. was std. spur (84t am i correct) and ran with pinions between 18 - 21tooth. we cant really tell you what pinion to go for as all tracks are different. and require differnt gearing. i manily ran with 18tooth pinion on standard spur with throttle turned down and top speed turned down on the transmitter

the reason for the overheating is that you played about with your esc. if you put more brake on the esc, it has to work harder and generates more heat, causing it to cut out (so you dont blow it up). 7minutes ?? thats surley long enough?

reset your esc to factory settings and try from there

Good point - as you stated I'd dialled all the brake away, mostly as it really wasn't needed in the D4 and having too much made it overheat indoors. Actually I never overheated that particular esc, just the similar one in my Cat, so adjusted both the same. Back some of the brakes away and it will be fine, its not a gearing issue - at least it never was in the Cat!

just reset the esc cut the brakes down a bit thanks si

i done the brakes and it fine thanks si coe
i think it was to do with the grass over long and wet but still ripping the grass up

driving in long grass will put the motor under far more strain than short grass or astro. this will obviously heat up the motor faster. it's not a good idea to race them in long grass as it will also wrap around the drive shafts

thanks jim 76