Roelof

[QUOTE=srt4johnny;15470672]I have writen this many times but OK....
With most engines timings are the most important thing that makes an engine. A low timed 9 port will never run that good as a high timed 3 port engine. Novarossi makes 3, 4, 5, 7, 8 and 9 port engines and all have their own kind of feeling and performances. This is not by the amount of ports but mainly by the configured timings.

OS have won many large races with a 3 port engines against many 5 port and even 7 and 8 port engines. But OS had always made only a 3 port engine and was configured to the max, now they have also 5 port engines. Novarossi has them al although the 9 port is only for onroad.. With Novarossi the price is making the performance, low priced engines have most of the time 3 ports but are low timed. High priced engines do come in all kinds of ports and do perform on a higher level, they only do feel different. Even the difference is not set by the amount of ports but by the combinations of timings (intake, exhaust and crankshaft opening/closing)

Stroke is also such a thing. Yes, long strokes will give more bottom torque but again, if it is bad timed it will never give that power as a good timed short stroke. All is just a commercial thing making us customers wanting to buy the latest and the fastest with the most crappy commercial story behind it.

Most of the drivers want to see the work on an engine thinking that those are the things to make it fast like the amount of ports, teardrops, hand grinding, all kinds of cuts, special backplates etc. Only a good timing is never seen by the eye, it can only be meassured.

Another thing making an engine is matching expanding materials. if the expanding rate of the sleeve and piston do not match well you will loose performance. The cheaper Novarossi engines have pistons of a cheaper material. Not that they do not work but the high priced engine has better choosen materials giving a better performance with a same timing.

srt4johnny

NitroVein

It's an old myth that long stroke increases torque.
And as said before the number of ports doesn't matter much at all, it can make a Small difference in how efficiently it is packing the cylinder without loosing to much out the exhaust.
And as said before, excessive grinding is usually done to sell or because they don't know any better.

The Rolling is nice, though mostly aimed at bottom end torque with really mild timing, but for most tracks it should have enough of a top end with the right manifold and pipe.

Galatians2 20

iTrader: (16)

Hey guys,

I finally ran my ST-RR with the N21BF Limited after sitting since about 2011-12.
Fired up right away and ran for about 2-2.5 tanks until I realized my two old hump packs were not lasting as long as they used to so I couldn't run anymore.

Is it common to have to retune after sitting so long?
It was running super rich when I first started it. I was making small adjustments here and there and it was running stronger and starting to hold idle better but I'm still going to have to make adjustments once new hump packs come in. Was watching temp and at one point hit 290* so I richened up the High end a little. Most of the time running was between 200-240 with some good full throttle rips.
Would the plug have anything to do with it? I use to run McCoy 8 which is now discontinued so I grabbed some Dynamite MT .18-.46 Medium plugs. Figured I would try them out for the price and they say they run cool.

Roelof

Maybe you have to take out the main needle and clean the needle and housing. Old oil will dry up and create issues. The plug should not be an issue, if your fuel is also that old, that can be an issue, be sure to shake the can very well or get something new.

Galatians2 20

iTrader: (16)

Ok I'll try the needle.
For the fuel I went with new fuel. I had a little left that was that old but didn't want to even try it.

Thanks

Cain

iTrader: (294)

question on odonnell plugs used with novarossi engines, in particular the Paloma gold head but not sure if matters in general.

What odonnell plugs are comparable to the stock plug that comes with the Paloma.

Reason I ask is I got a variety of odonnell plugs here, figure maybe they could be used but trying to confirm.

petersen114

srt4johnny

srt4johnny

petersen114

J.Whiting

iTrader: (63)

9901 pipe and 41021 header was the best combo I came up with also..

srt4johnny

Pedro Jesus

Hello my friends, I'm here with problems with a Novarossi Mantra.
I bought the new engine in the box, what happens and I follow what Novarossi says in the manual.
And I can not get the engine to make a deposit to the idle, so I'll fire the igniter glowplug engine soon.
The only way the engine does not go down and use the embedded glowplug igniter, I already made two deposits so idle, but no solution.
I'm using a hot air gun to warm up the engine and start working at 100 degrees.

Thank You

srt4johnny