Which sintered rotor and endbell do I need that is legal by BRL rules in the 4300 class?

nov5923 sintered rotor and endbell
nov5908 sintered rotor
nov5919 ribber endbell

Does the endbell need to be changed to upgrade to a sintered rotor?

I know there is a bigger bearing or something, but is it a "must change"?

Sintered rotor has the bigger bearing so with that the endbell will be needed. :thumbsup:

If your motor currently has the black upgrade rotor you do not need to change the endbell, you already are running the big bearing. If you are still on the original gray rotor then yes you need the endbell. This is in reference to 4300. All the 13.5s orinally came with the black rotor and big bearing endbell so they do not need a different endbell.

If your motor currently has the black upgrade rotor you do not need to change the endbell, you already are running the big bearing. If you are still on the original gray rotor then yes you need the endbell. This is in reference to 4300. All the 13.5s orinally came with the black rotor and big bearing endbell so they do not need a different endbell.


The initial release of the 13.5 was accidentally shipped with the gray rotor and small bearing endbell. I had one. You can contact NOVAK if you have one of them and they will send an upgrade. You'll need the serial number from the motor though.

My upgrade included the sintered rotor. I was expecting the black rotor. It was a pleasant surprise.

Thanks guys.

Just wondering...what is this kit for? I don't get it? Doesn't look like a sintered rotor to me. http://www.lefthander-rc.com/catalog/product_info.php?cPath=50&products_id=905

Tommy,

That appears to be the original "Upgrade" kit. It was a 'better' bonded rotor than the original Black one w/ the small bearing. This rotor is Gray and uses the same BIG BEARING as the Sintered rotor I believe.

Guys correct me if I'm wrong~ :)

its the same rotor, its just a bigger end, and the bigger bearing. i heard storys of the original ones with the smaller shaft and small bearing of the pinion shaft bending on impacts. but thats old school, no one would buy that any more, its proabably also nla if you look on novaks site.

one of the original 4300's I have...has a small bearing rotor and brass sleeves on the ends to fit into the bigger bearings. (I have 2 old style rotored motros...one with a Black and one with a Gray.. never really paid much attention to them ...THEY SUCK compared to a sintered motor...LOL ) But they make good loaners cause they were cheap USED.

I thought for use I'd be able to find REALLY Cheap USED Sintered rotors for them with all the guys who replace their sintered rotor because the numbers read low...

Not so lucky so far.

Thanks. That's what I figured it was-something kind of outdated. A friend wanted to be sure to get the right one.

Thanks. That's what I figured it was-something kind of outdated. A friend wanted to be sure to get the right one.

Who you trying to kid...You don't have any friends :jest:

so what about the crome sintered rotors are they the same thing/beter worse?

The sintered rotor is nickel plated. Only one available that is nice and shiney that I know of!

The initial release of the 13.5 was accidentally shipped with the gray rotor and small bearing endbell. I had one. You can contact NOVAK if you have one of them and they will send an upgrade. You'll need the serial number from the motor though.

My upgrade included the sintered rotor. I was expecting the black rotor. It was a pleasant surprise.

I know, it's off subject, but... why does ANYONE want to go with other brushless manufactures? I am sure NOVAK will come out with bigger and better rotors, but least you all forget, oval isn't the only form of R/C racing. :wave: Ruling bodies (ROAR and ARCOR) should separate and make the rules, simple for us simpletons. :thumbsup:

On the other hand, who has catered to us more? WAY TO GO NOVAK!! :woohoo:

i have an older 13.5 with the can that is not ribbed. if it has the black rotor then all i need to upgrade is a sintered rotor, correct? also, is this just as good as one of the new ribbed can motors?

thanks
john mc

what is the performance difference between the diff.. 13.5 rotors ?
i have been told to gear diff (5.1-4.1 fdr) for the same track depending on the rotor is their that mutch difference between rpm vs TQ

The sintered rotor seems to make a ton more power, plus it allows the motor to run cooler and let you gear taller.

I know if you feel the physical difference of the magnetic strength of the Sintered rotor vs. the non-sintered rotor - it's HUGE.

As far as the old NON ribbed style vs the newer RIBBED style cans...as long as both have the sintered rotors, they should run the same...I don't really think you'll see a difference in speed with the ribbed can, and I don't think the ribs will show much difference in the temp a 13.5 motor will run.

28 if you have the old end bell and non sinterd rotor you will have to get the new end bell with the sinterd rotor as it takes a bigger bearing.

i have 4300 motor i get used and opened it old stuff inside do i have to get
upgrade bell end then get sintered rotor or is a package thing , because the
link on preveits page shows the bell end and gray rotor, i thought the sintered
rotor is brass colored. and i get new EX 13.5 motor can i use the same bell end and sintered rotor in it? :freak:

28 if you have the old end bell and non sinterd rotor you will have to get the new end bell with the sinterd rotor as it takes a bigger bearing.
All the 13.5's were supposed to come with the large bearing for the shaft end. In that case all you need to buy is the sintered rotor. If your 13.5 has the small front bearing, that is a mistake, and you can contact Novak for a free upgrade as long as you provide the serial number of the motor and it is actually one that has the small bearing by mistake. Someone else posted on here that when they did this, they received a sintered rotor along with the large bearing endbell.

i have 4300 motor i get used and opened it old stuff inside do i have to get
upgrade bell end then get sintered rotor or is a package thing , because the
link on preveits page shows the bell end and gray rotor, i thought the sintered
rotor is brass colored. and i get new EX 13.5 motor can i use the same bell end and sintered rotor in it? :freak:
You can buy the upgrade endbell and sintered rotor in one package and save some money as compared to buying each one separately.

I think there were a few 13.5's that got out with small bearings on both ends.

Here are a couple of pages to take a look at:

Replacement rotors for your motor
Rotors (http://www.shopatron.com/index/135.0.15995.17447.0.0.0)

Non-warranty motor replacement/exchange service options:
SERVICE REPLACEMENT OPTIONS -- Brushless Motors (http://www.teamnovak.com/cs/web_options/index_motor.html)

Rick- I would consider other manufacturers for a couple of reasons. Novack quality control leaves a lot to be desired. My first 13.5 motor was defective out of the box, and the speedo wires had to be touched up before it was even run.

But the BIGGEST reason is the NON-EXISTENT customer support. I had problems setting up the speedo so I called tech-support. Basically, a taped message told me to "call back later". I guess novack takes a couple of hours off in ther middle of each day for siesta or something. Must be a California thing. Noone ever called me back. On my 5th call of the day to novack I got some apathetic dude who just kept telling me "you are doing something wrong" and refused to walk me through the setup process and insisted I send it in to be checked out. It was my thought that we all want to avoid that. he clearly had something better to do and wanted to rush me off the phone as quickly as possible. My sixth call to novack resulted in the receptionist screening my call, asking "who is this calling"? then coming back to the phone saying noone was available to take my call. She promised me someone would call back to help me through the setup process. I'm still waiting for that call. Needless to say I had a very bad experience after trying Novack again after 10 years. The rest of my cars will be outfitted with LRP gear from now on. There is simply no excuse for the way my problems were handled under any circumstances.

Mayhem, You must be the only person I have heard of in the past 5 years to ever have any issues with Novak customer service. I bet they have the best customer service department in RC. Do you know who you talk too? Any time I have had problems with customer service RC or not I get that persons name so when contacting them again I know who it was.

I guess I was just lucky.
I had a couple of dumb questions about the GTB-4cell, and
I got answers and more in a matter of minutes....
And also an "if you need anything else, just ask"...
Guess you just had bad luck, Bob....