i keeps seeing ports mentioned like thier some big deal. people talking about half bridge ports , street ports etc. do these have some special impact on rotory engines? what are they?
:cheers:

 

changing the porting on a rotary engine is the same as changing the cam on a piston engine. It changes the intake (and sometimes exhaust) operation, generally to be less fuel efficent, but create more horsepower.

 

A port is a hole where gas/air goes into the combustion chamber

 

Technically, they are the holes of which air and fuel flow in and out of the engine.
The stock ports have a very specific shape. When you change the size and shape of these ports, you call it something else... a street port is a port which is slightly larger than stock. A bridgeport is when you physically cut a second port right beside the normal port... there are some very specific reasons for doing this that would take far too long and be far too complicated to explain to a fresh-rotary enthusiast.... just think of a bridgeport as a port that is much larger than a street port.

By changing the size and shape of the port, you alter the port duration and total airflow... same as changing a cam on a piston engine. Each different port shap and size has its own unique affect on powerband of the engine, and tis total power.

 

These are intake ports only... there are separate ports for the exhaust gases, but they don't really change much in shape, merely size.

http://www.fc3spro.com/TECH/PORT/porting.html

 

thanks for the useful replies

 

Check this out as well:

http://www.rotaryengineillustrated.c...-shousing.html

http://www.rotaryengineillustrated.c...-ports101.html

http://www.rotaryengineillustrated.c...-rhousing.html