Jan 16, 2012 · A "looper" uses loop charged induction. The other style is called Crossflow scavenged induction. There have been many threads that discuss the differences between the two. In general, loopers are the better design of the two. And nearly all carbureted 2-strokes larger than 15hp since around 1985 are loopers.
Ok. Thanks for the answer, now all I gotta do is figure out what the difference is between loop charged and cross-flow. This engine is 1963 vintage...was loop-charged invented then?
Can you point me to those iscussions about this topic. I'm really new to this site and i dopn't know my way around.
Ok...Thanks to your help I have the answer. the terms refer to the manner in which the intake air replaces the exhaust in a 2 stroke. From what I can conclude loopers had flat topped pistons while cross flow engines had various shapes of mountains on top of the piston to direct the intake air upwards and force the exhaust air out.
To answer your question - your motor is a crossflow. ALL OMC V4s up to 1985 were crossflows. The ONLY OMCs with loop charging until that point were 3-cylinder inlines and a few experimental racing engines.