RCU Forums - View Single Post - Some engine help please.

08-25-2009 | 08:22 AM

#10

DarZeelon

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From: Rosh-HaAyin, ISRAEL

RE: Some engine help please.

Quote:

ORIGINAL: Moki 1.8

...The .91FX ways less than the .95AX and the .91FX is (if I spell this right, lol) scherley ported. I'm prolly gonna get the .91

Moki,

I believe you probably meant Schnürle ported (Schneurle - if it must be typed only in English ASCII characters).

Nearly all two-stroke engines sold anywhere today have schnürle porting + a boost port; both above OS engines included.

The classic schnürle porting arrangement includes only the two rearward angled side-ports.
The upward angled boost-port, at the rear, is there to add even more power.

The orientation of the ports is to the exhaust port; not to the engine itself. I.e. if the exhaust is to the side, the boost-port is on the other side and the schnürle ports are at the front and the rear of the cylinder.

Other, less common porting methods are TST - Travasi Super-Tigre, baffle-piston (loop-scavenged) and the Cox two-port... There are others too, such as PDP (Perry Directional Porting), that goes with baffle-piston and TST...

EDIT: Typo.

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