hight velocity

[maxrom]

Hy,
does any of you heard about ** hight velocity carburation and exaoust **

based on reducing size off intake and exaoust diameter as much to 30% , this result to an increasing tork at low rpm and as much as 10 hp on rear wheel

 

[one2dmax]

You're talking about a "fast burn" type chamber design. Already tried it with poor results (at least on the 1500 - the 1300 we did ran ok).

Sean

 

[MaxMidnight]

...based on reducing size off intake and exaoust diameter as much to 30% , this result to an increasing tork at low rpm and as much as 10 hp on rear wheel

The design of an engine is full of compromises as the motor needs to produce useable torque throughout the rev range.

What you describe would have a positive effect (in general) at low revs and you would increse torque BUT there is a cost - you don't get owt for nowt.

By reducing the diameter of inlets and exhaust you will limit the amount of gas that can flow as the revs increase. Your gain at low revs will be balanced by a reduction as engine speed rises.

That wouldn't work particuarly well on the Max as the choke diameter is already too small to allow the engine to breathe at high revs.
However those clever Yameringha engineers thought of this and opend up a feed from an adjacent carb to supply the extra charge required - they called it V Boost.

 

[Ridin Dirty]

The design of an engine is full of compromises as the motor needs to produce useable torque throughout the rev range.

What you describe would have a positive effect (in general) at low revs and you would increse torque BUT there is a cost - you don't get owt for nowt.

By reducing the diameter of inlets and exhaust you will limit the amount of gas that can flow as the revs increase. Your gain at low revs will be balanced by a reduction as engine speed rises.

That wouldn't work particuarly well on the Max as the choke diameter is already too small to allow the engine to breathe at high revs.
However those clever Yameringha engineers thought of this and opend up a feed from an adjacent carb to supply the extra charge required - they called it V Boost.

Pretty much the way a four barrel carb works. Small diameter primaries to maintain charge velocity at low RPM's and secondaries that open progressively as revs increase, allowing more volume into the intakes.