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Nitro carbs spot the difference!


Chris_205

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As per the thread title I have a few!

So my question is probably best answered by someone that has more experience than myself! 

Apart from the varying different size venturi's for the air side of things are the lsn, mrn (where applicable) and hsn also different in size to match the amount of air flowing in, or is it a case of same size jets/needles adjusted accordingly to the amount of air flow?

I get it that the engine will only take X amount of air/fuel mix per induction cycle.

I think what I'm trying to get at is, am I wasting my time putting a bigger bore carb on to get more power? 

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The carb needles arent changed from stock, the venturi just affects the fuel/air mixture. If your just bashing then I would say you dont really need to use a venturi as usually meant for racers where they want to adjust the driveability according to track type,  

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In simple terms.... yes. Slapping on a bigger carb is a waste of time.

 

For a 2 stroke engine like these, you want a carb that is matched to the porting and general state of tune. Throwing more fuel and air in only helps if the ports I inlet...transfers and exhaust ) can move it where it needs to be, burn it, and get the waste products out.  Putting on a mis matched carb may give you less power as you re-tune to try and get it to run in a stable state....but it's not 'bolt on power'.

 

Playing with the inlet venturi side will also change the speed of the airflow, as its dictated by the engine generating negative pressure. That will also have an effect on not just peak power...butr also the spread of power.

 

Racers are generally running more highly tuned motors, and these are going to respond to small changes in the inlet, but they are not necessarily changing to increase power. Its as likely they will be trying to get a wider power band, to help drive out of slower corners as trying to get more speed on the straights.

 

'more power' needs a dyno to measure it too....

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