I have a Novarossi 353 .12 Tuned Plus 2. I have been trying to lean it out as much as I dare but it will run out after 4.75 minutes.

It has a 5 finned manifold with (2660 pipe?).

If I try to lean the low end out more I see a rise in temp and I don't think its accelerating as well.
If I lean out the top end, its top speed is noticeably faster but temps are too high.
(I'm trying for the 120-130C range), but not above 130C.

I'll try using longer fuel line, although I wonder if that will make tuning more difficult.
Also what about these finned exhaust coolers. Do they really make a difference or are they used more as a exhaust filter.

Fuel is 16% nitro, 10% oil (5% Syn Oil, 5% castor oil).

Anyone have similar issues with their Novarossi 353, or other brand engines and how did you get around it.

Cheers.

This is a common problem and not always easy to solve. First, make sure your fuel system hold the maximum allowed amount of fuel.

Ultimately you may have to go to a different pipe and with that engine you may need to run hotter.

hi we run baileys 353/ 150 at nats because it liked to run a bit hot /is the black plastic bit still in your tank/have your tank measured next time you are at track some tanks are small not many but some are pipe / manifold are the right ones for 353
greg

The best solution is to change the header from conical type to non conical, and go to 6 fin header.....you´ll manage to get 5:30minutes at best.....all modern engines are fuel suckers...another option is reducing venturi size from 5.5mm to 5.0mm, but power gets hurt but being more drivebable.

Afm

Get a 2668 RB pipe and you will be good.

Thanks for the info.

Would going from a 5 Fin Conical to 6 Fin Conical make enough difference with fuel saving.
Or should I go from 5 Fin to 6 Fin Non-Conical as you suggested.

Ive had a look at the pipe. It says Novarossi Italy, but I cannot find a number on it. Perhaps it isn't a 2660 pipe. Just read that they was the recommended pipe.

Also there is no number on the manifold.

So the manifolds are designated Conical or Cilindrical (=Non-Conical).

Cheers

Does this pipe fit the Novarossi manifold.

How aggressive is your clutch setup? This is another factor that affects fuel mileage. A more aggressive clutch that engages later means more power but also more fuel.

Thanks mate.

I do wonder if my clutch is set to soft (slip too much). One of the experienced guys at my club set it up after we shimmed the gears.

I have let it out a little since then. But will try loosening it some more.

It may be a combination of a few factors. This could very well be one of them.

Cheers

Answering your questions:
1.- Going to non conical header will make fuel savings, but in the order plus or minus half a second at the most.
2.- Number of fins will depend on what you´re looking for...shorter more top end...longer more low end
3.- Make sure you have the 2660, because there is the 2630 which looks the same, but used to be a fuel guzzler, that is why they came out with the 2660
4.- Probably numbers have faded out, but new have clerly printed numbers.

NOVAROSSI HEADERS
NR2615 CONICAL SHORT 5 FINS
NR2616 CONICAL MEDIUM 6 FINS
NR2617 CONICAL LONG 7 FINS
*************************
NR2618 NON CONICAL SHORT
NR2619 NON CONICAL MEDIUM
NR2620 NON CONICAL LONG
CONICAL HEADERS obtain maximum peak power of an engine, but greatly increase the fuel consumption.
NON CONICAL HEADERS give a little less power, but reduces fuel consumption.


AFM

just a note it is a novarossi it may not make run time even after the changes

http://www.amainhobbies.com/product_...ifold-Polished

It comes as a complete set.
I had the exact same issue and tried everything from leaning out the motor to a longer fuel line. 2668 RB will provide good power & great run time.

Thanks again for the info.

Just to clarify, how much fuel saving do you get from the 5 Fin to 6 Fin and Conical to Non Conical.
Are you saying save 1/2 a second of fuel a lap?

I will buy a six fin manifold as Id like to try more bottom end torque at my track.
Just not sure if I should get conical or non-conical.

Thanks.

Do you have a Novarossi 353. (or another Novarossi), or are you using this combo on a different type of engine.

Does this manifold fit all Novarossi .12 engines.

Cheers

1/2 a second on total run....if you are making 4.30 minutes per tank you´ll make 5.o minutes.

for fuel saving it´s got to be non conical.

afm