COOL!!!

From my expirience ( 10 years with AAC, BRB and 17 years with ABC) can tell you-AAC is easier to make more torq ( for torq type aplication), BRB much easier to get top speed and last much lomger ( no need to buy new set, just keep replacing pistons) and ABC is just avarage power and life. AAC is more dificult to handle-small mistake and sleeve is bent.
In RC cars I found AAC much better works on tight tracks and BRB s more for high speed tracks. But in the mean time BRB can easy bring 8 minuts run time. There is a lot of thing behind material set ups and everything has logical explanation.
Defenetly price for BRB and AAC is higher in AAC case due to more dificult process to plate it by chrome and BRB is due to price of Berilium bronze. Bu t final price got to be no more then $10 difference between BRB, AAC and ABC.
I perconaly run only BRB and AAC sets and feel much more comfortable then with ABC-I can set engine for any track ( custom set ups ) within 10 minuts and will know -this is the best possible from particular engine.

Is the BRB an after market product only, if so who makes them and for which engines, I would like to try one.

I have a modified Siro 12 evo1, the mid range is to lean. I have compensated for it by running the bottom end rich, but I have lost some punch out of corners. I was thinking of shortening the low speed needle, has anyone had the same problem.

So I'll assume since I only got one reply(from afm), that everyone here uses the NovaRossi plugs in there Sirio???

Well, thats fine, as long as they're good plugs, work well, and have a reasonably good life span. The info on these plugs says that if I'm using over 25% nitro, to stick with the C7S or C8S. Since I'll be using 30%, I guess I'll be going with those.

I'm using OS turbo plugs...No 6 (hot ) fits like a T.

Us a hot plug n match it with a pick up pipe to compensate the rich low end

PACMAN 25

Have you experimented with the lenght of the pressure line from the pipe to the tank??
This is what the late Ron Paris said about it......

"Did you know the longer the fuel line coming out from the tuned pipe the leaner you can make the midrange as the engine comes up to full power?
This is caused by the delay in time it takes the fuel tank and line to reach maximum pipe pressure.
Keep in mind that this tip should be used as a fine tuning adjustment on your motor at the track.
Experiment with different lenghts, between 10 to 17 inches is normal"

I have a SIRIO S12 EVO2, and as with all my previous engines I've used this tip with success. Every engine and carb is a whole new story.


Hope this helps.
AFM

Thanks I will give that a try, I don't usually run a long pressure line.

I am using a Sirio .12 ABC 3 port turbo with NR no7 plug and NR .12 inline pipe ... I found that it do not carry enough acceleration on my RR.
With TC body, the engine is around 115C ...

Centrax / 2speed setting is standard at the moment, what can I do to improve its power ?

PS : I do have an extra NR .15 inline pipe, with this help ?

If your using 25% nitro please use sirio no. 7 plug. If your interested to get one go to this web site
www.dogboneind.com

It is after market product ( it used on all world champions in airmodeling). I make them. If you want to try give PM.

First let me tell you that Sirio engines have their power band at a higher point than the traditional Nova based engines, so in my track experience I found that to get this engines "singing" you have to use shorter gear ratios. For example in my Yokomo I use lets say 48-45 spurs with Nova engines, with my Sirio I have to use 49-46 spurs (1 tooth shorter), and then the engine really rocks and has an incredible low and top end.
With respect to the pipe, it depends what model of NR inline you have. I personally found that the engine works best with Sirio's own in line pipe S12 200006, or the Yokomo M Mielke in line pipe.

Hope this helps
AFM

vones: thats odd, I thought I had tried fitting a standard OS plug in my standard Sirio and it didn't fit. As far as I could tell, the threads wouldn't even catch so I could start screwing it in. I'll try it again, but it didn't seem like it they would work.

suntok2: I'll take a look at that site......thanks for the suggestion.

I'm using the turbo Sirio 5 port AAC, with OS turbo plugs....as for the standard Sirio, I'm not too sure abt the plugs.Cos in S'pore most of us use turbo engine