Page 1 of 1
Ceramic diff rings
Posted: Fri Oct 27, 2017 4:46 am
by sandkil
Hey,
Anyone knowing what companies made ceramic diff rings for RC10L pan car.
I came across one:
BRP.
More suggestions please
Re: Ceramic diff rings
Posted: Fri Oct 27, 2017 5:39 am
by camlchris
Kyosho made it long time ago. However, suggest not to use it nowadays. Use the steel diff ring with ceramic balls are the best combination for modern BL + LiPo.
Re: Ceramic diff rings
Posted: Wed Nov 29, 2017 3:07 pm
by lmw94002
I think IRS made a ceramic diff / fiberglass axle kit...
come to think of it... i wonder if it's in my box somewhere... I know i sold the car, but i still have a small box of pancar parts...
Re: Ceramic diff rings
Posted: Thu Nov 30, 2017 3:14 am
by Lonestar
camlchris wrote: ↑Fri Oct 27, 2017 5:39 am
Kyosho made it long time ago. However, suggest not to use it nowadays. Use the steel diff ring with ceramic balls are the best combination for modern BL + LiPo.
steel main rings, top-quality carbide main balls
+
steel thrust rings, ceramic thrust balls
is what you want. The issue with ceramic main balls is that they are so round and smooth that they slip easier than carbide balls... we've come back from them ceramics even though they were the hot ticket a few years back
Re: Ceramic diff rings
Posted: Thu Nov 30, 2017 3:25 am
by camlchris
Lonestar wrote: ↑Thu Nov 30, 2017 3:14 am
camlchris wrote: ↑Fri Oct 27, 2017 5:39 am
Kyosho made it long time ago. However, suggest not to use it nowadays. Use the steel diff ring with ceramic balls are the best combination for modern BL + LiPo.
steel main rings, top-quality carbide main balls
+
steel thrust rings, ceramic thrust balls
is what you want. The issue with ceramic main balls is that they are so round and smooth that they slip easier than carbide balls... we've come back from them ceramics even though they were the hot ticket a few years back
When using the ceramic main balls + Steel main rings, u have to use QTEQ polishing system to polish the rings with micro grooves to prevent slipping and increase the friction. Nowadays, Ceramic balls are now much cheaper & last longer than carbide, and is the racers choice.
Re: Ceramic diff rings
Posted: Thu Nov 30, 2017 3:27 am
by camlchris
Re: Ceramic diff rings
Posted: Thu Nov 30, 2017 3:53 am
by Lonestar
I've polished rings since long before there was the interwebz
I have to admit i have not raced ball diffs in onroad for quite a while now, as my main class is EP TC and thank god we have gear diffs now and cars that are designed around them
Same for Offroad. I don't remember the days of the Cyclone TC where I basically had to rebuild my diff a few times per raceday as we were running seriously ballsy brushed motors or the beginning of competition brushless motors: with the torques, diffs were toast in a couple of runs.
For pan cars, ball diffs seem to still be the hot ticket. A few years back, polished or not polished diff rings, ceramics were too demanding for the average racer. First, the slip (even if polished), the tension sweet spot on the diff spring was very hard to fall into and the tuning window was is very narrow. Second, once the slip's happened, the diff ring was thrashed given the massive difference in hardness between both materials. Slip isn't only under power: it's also when there's a hard stop (wall), a cartwheel, or anything that applies unexpected torque on the transmission.
Ceramics might have lasted longer for top-notch diff builders and drivers. For the average racer, they wereactually more complex to manage, and in most cases maintenance was more extensive (and expensive, too).
Just sharing past experience - maybe things've changed now, including for the average joe toying around with a 10L on the parking lot...