Dexter

U must remember that the Rody's up until a couple of months ago were by far the most powerful engines and therefore putting the most load on their parts which are the same as the stock ones, of course things are going to fail! But my understanding with the Rody's was that they were Breaking at the crank window? I'm not sure if they opened the window up in the mod process though.

Taylor-Racing

Yes, there are a few Rody's around these parts that have "let go".
There have been cases of rods losing their crank pin bush's, broken rods, seemingly mis-installed bearings - nothing too unusual for a .12 race engine putting out decent power.
Cranks do break but I've seen a few Nova S3's break cranks also.

Our Rody has been good but you need to keep the maintenence parts up to it.
A bad inner bearing will certainly lead to a failure of some kind or other.

I expect the ceramic bearings in the newer RB V12's and Nova NS engines will be longer lasting - the ceramic balls have a better load carring capacity and don't tend to gall like the steel ones. You can also expect that the ceramic bearings will be twice the price of steel ones.

KMW

iTrader: (11)

Has anyone tried, or seen, the new RB .15 small block (V15) for 200mm sedans?

http://www.rbproducts.com/rbww/engin...700-000730.htm

popsracer

Guys;

I just purchaced an RB V.12 for my Reflex NT.

Anything out of the ordinary that I should be on the lookout for? Gearing, tuning wise?

Thanks, Steven (popsracer)

InitialD

Ceramic bearings in the NS and V12? I thought the use of ceramic bearings are illegal in engines... Perhaps I'm wrong.

Taylor-Racing

Hmmm . . . is this not the case?
Actually, I thought you were the one talking about them - I could be wrong.
I've been talking to specialist bearing people lately and the ceramic bearings are available with a 11.5mm ID - not cheap, though.

We run under essentially IFMAR rules and there is no mention of ceramic bearings being illegal. Where are they illegal and why?

sparksy

iTrader: (14)

There is no mention of bearing types in the IFMAR rule sets. So there is no reason they would be illegal in clubs that run under IFMAR.

For the other racing organisations such as ROAR they have their own rule sets for the various classes. It may be mentioned in their class/general rule sets.

Tabushi

iTrader: (1)

I used to run RB Engines for about 3 years on my Yokomo GT4 ... the RB Engines are JUST GREAT, i think that have the reliability of OS Engines with the great power output of italian engines, wich gives you a great power-base for your nitro car ...

Right now im running novamega's on my Yokomo, the Novamega SX12RE EV-1 its a great engine, but i miss the reliability of RB ones ... i have to change my engine in about 2 months and definitely i will go for RB.

cya !

fastharry™

iTrader: (4)

http://www2.towerhobbies.com/cgi-bin...?&I=LXFRC8&P=7

AMGRacer

Many of the RBs I have had (and Novarossis for that matter) have misaligned inner bearings. But I really think the failure is due to crankshaft stress. There is a HUGE amount of force per second on the crank pin and I think the additional material removed from the Rody crank does not help.

I have a bearing removal tool which is effectively a slide hammer which can be used to realign the inner bearing easily. After this treatment the crank falls out of the motor if the rear cover is removed rather than it having to be knocked out. Also I am using a S3 crank on my Rody, just in case

fastharry™

iTrader: (4)

who makes that bearing tool,AMG?......I almost bought the OFNA,but it won't do the new 11.5 mm bearings in the new NOVA based motors..

OFNA told me that there isn't enough call for those motors....so they won't have an adapter....(unless,of course,THEY decide to copy one )

BongR

Hey Pops,
Art B. has one on his ntc3 and it looks like a it's a great engine. He ran it @ RD logics race and he did very well. Lots of top end despite being rich(he usually run out of gas during the qualifiers).

VinceR.

Hope you guys can make it @ toyota challenge.

popsracer

BongR;

Guess I'll find out tomorrow at Revelation. Gus and I are going for practice later Thurday afternoon. Gotta get ready for Sunday.

InitialD

[QUOTE]Originally posted by Taylor-Racing
[B]Actually, I thought you were the one talking about them - I could be wrong.

Yes, I talked about it in the engine wars thread but I was actually enquiring if anybody changed the stock bearings in the engines to ceramic ones and noticed any difference...

Because ceramic bearings have the added advantage of being able to spin faster with less resistance and rotating mass?

Cut and paste from Motorman's past post;

Yes I have used them (ceramic bearings) since before boca went public with them. They are excellent and will outlast the rest of the engine. I wish they would let us use them in Roar legal engines as I have toasted a motor or two due to bad bearings myself. The initial cost is neglible nowdays compared to the cost of other RC car parts. If it saves an engine its worth every penny.

PS I have never had or seen one fail, EVER!

So my guess is that they are illegal under ROAR but legal under IFMAR?

Taylor-Racing

Hmmm, OK. One of our friends has had pretty much everything break in his Rody - and multiple times, too, with little work being done by the engine. He put it down to misaligned bearings. In the end it went back to RB in France - outcome unknown as yet.

Agreed there is plenty of stresses happening to the crank and bearings in good condition is essential. As soon as the rear crank bearing starts to wear, the crank no longer remains central, the rod is therefore potentially accepting side loads on the con rod bearing, then the gudgeon pin . . . . I'm sure it all starts to go downhill from there.
We broke the crank pin section off a JP - I put it down to the above.

The S3 crank's I've seen broken have been at the rear of the intake window, and on pretty new engines, too. If you examine the milling that forms/cuts this window, the finish is pretty course. I would guess there are plenty of stress raisers in this region.