225 fuel burn and cruise

[Wolf]

Not to sound dumb, what does looper mean or stand for? I've never heard that terminology before.

[THEFERMANATOR]

Originally Posted by Wolf

Not to sound dumb, what does looper mean or stand for? I've never heard that terminology before.

Looper refers to a 2 stroke engine using a loop charged style porting whereas older 2 strokes and some smaller models until recently used cross-flow porting. Cross flow engines use a tall dome on the top of the piston crown to direct the incoming air into the combustion chamber and push the exhaust out. Loop charged engines use a flat top piston or a small crown on the piston as the ports direct the airflow in and use that flow of air to direct teh exhaust out. Cross flow engines are much more efficient at lower RPM's, but use more fuel at higher RPM's due to the porting designs short falls. Loop charged engines don't idle as well since the porting uses airflow to direct the gases through the combustion chamber. When RPM's are low the airflow is low which makes the porting less efficient, but when you increase the RPM's and up the airflow the loop charged porting comes into its range and increases efficiency which allows them to make more power up high with better fuel efficiency.

Some reading for you if your interested.
http://en.wikipedia.org/wiki/Two-stroke_engine

[Wolf]

Ok, that makes sense. Now I know what the heck you guys are talking about when you say looper. I have a '87 150 Suzuki that runs great. I also have '98 225 Suzuki that I'm getting ready to replace a piston then install on my '78 v20. Thanks again..