R/C Tech Forums - NOVAROSSI Engine thread....

You know I'm no idiot. I've been racing rc cars for over 20years, and I've had nitro buggies since 1990. and I'm just saying when i clean and rebuild my x7 with ceramic balls in the bearings that monty did when I spin the crank with my hand before i reinstall the piston and sleeve those bearings are smoother than any other I've touched...

I never said anything about performance gain....but it does feel like a ceramic rear helps the motor spool up faster, but doubt it makes more measurable power.. I have a lot of attention to detail and I can feel very slight changes in my car so take it for what it's worth....maybe I can measure what your dyno can't with my highly tuned sensory input device....

I have no doubt it feels like is spins smoother.. As for a engine spooling faster under load, not likely....Not unless the bearing being replaced created substantial amounts of drag of course....ceramics are smoother in theory, but since these bearings are being run nearly submersed in lubricant I cannot see any noticeable friction differences between steel and ceramic... if the lubricant is doing its job the balls will be riding on a film of oil anyways.... Well thats my story and I am sticking to it !

Maximo

11-14-2011 11:30 AM

Quote:

Originally Posted by houston (Post 9908764)

Its 30 min of running at 36k rpm is what the sheet says they send with the enginee

Laps in the p/s set very well actually , pretty much ready to run when installed

Hope this helps

They spin em at 36K wow ! that must be deafening in the building LOL !

MattP

11-14-2011 12:19 PM

Anyone looking for a near new Novarossi 9853 Super Strong pipe I just listed one for a good price.

http://www.rctech.net/forum/r-c-item...ml#post9909221

merdith6

11-14-2011 12:44 PM

Quote:

Originally Posted by Maximo (Post 9908983)

I was commenting on Monty's work. No big deal, I just didn't like my compliment being followed by the comments you made. I think any performance gain from ceramics is due to lighter rotating mass, not smoothness or friction...

Maximo

11-14-2011 01:03 PM

Quote:

Originally Posted by merdith6 (Post 9909346)

Understandable.....I didn't intend to offend you if I did so !

houston

11-14-2011 01:10 PM

Quote:

Originally Posted by Maximo (Post 9908994)

They spin em at 36K wow ! that must be deafening in the building LOL !

Thats what the break in sheet says

Ambros303

11-14-2011 01:11 PM

Quote:

Originally Posted by merdith6 (Post 9909346)

+1
The main advantage of ceramics is less rotating mass, which means faster spool up and some gain in top end RPM. That is the theory at least. Is it measurable?...idk

They should last longer aswell as the balls wear less then steel. Note i write "should" as ofcourse there are more factors that dictate wear. The balls can't rust either which is a plus aswell.

Roelof

11-14-2011 01:23 PM

4Nice discussion about ceramic bearing. Can someone explain why Novarossi can ask 100 dollar for a main ceramic bearing which will last only 5 liter in the onroad while their 50 dollar priced main steel bearing last longer?

It is not only about the balls but the braces also and there seems to be a weak point with Novarossi.

I wish engine manufacturers would use normal standard size bearings, then there was a wide choice in cheaper and I do think much better bearings.

jose valadao

11-14-2011 07:58 PM

Restricter

What size restricter is better for a track with a long strait away
I am using a 6mm on it but seems to hold back can I get any info on
The best Restricter for this

houston

11-14-2011 08:07 PM

Quote:

Originally Posted by jose valadao (Post 9911515)

What size restricter is better for a track with a long strait away
I am using a 6mm on it but seems to hold back can I get any info on
The best Restricter for this

I would go with 7mm personally , thats my base starting point

Lille-bror

11-14-2011 10:10 PM

... or try a 086/9886 with a ultra short header and stick to the 6 mm :nod:

houston

11-15-2011 07:09 AM

Quote:

Originally Posted by Lille-bror (Post 9912066)

... or try a 086/9886 with a ultra short header and stick to the 6 mm :nod:

ya , a 9886/41021 setup makes a lot of rpm :nod:

6mm makes your engine VERY hard to tune , that is the main reason i would switch if i were you :)

merdith6

11-15-2011 12:08 PM

Yep

Maybe even try a 7.5 on that engine, with a 9886 and try the 41019 or 41001headers..

I've been really impressed with these bent nova headers recently.

Lille-bror

11-15-2011 12:21 PM

+1 on the 41019 header.

Hard to tune with small venturi? Yearh. Last year I tried 6 mm in a Plus4 at 27º Celsius. I nearly just had to touch the LSN, and the tune was changed. Sensitive? Yep. Great fun? ABSOLUTELY!!! :p

houston

11-15-2011 01:02 PM

Quote:

Originally Posted by merdith6 (Post 9914371)

Maybe even try a 7.5 on that engine, with a 9886 and try the 41019 or 41001headers..

I've been really impressed with these bent nova headers recently.

those headers dont work quite as well on the 9886 , has what a feels like a lean bog that isnt and cant be tuned out , i have played with lots o combos over and over and over and over and when the 9886 is brand new it works OK but as soon as any buildup starts in the pipe , no bueno

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