Home  Contact  
phone 07842 634090  ORDERING shipping
         SECURE ONLINE ORDERING           
FSRV Model Boats   Gas Tuned Pipes    Tiger King engines  Kraken mono   Zenoah Marine Engines   Flexishafts

Longstroke vs shortstroke in two stroke engines

Longstroke VS shortstroke.  Differently to four strokes, a short stroke is not higher power/higher revving in a two stroke engine. The port area available in a two stroke engine is proportional to the the cylinder wall area not the head area. This favours long stroke/small bore The limitation is friction/wear and inertial effects and so the best stroke/bore ratio seems to be between 1:1 and 1.2:1.

Rod/stroke ratios.  A rod stroke ratio of 1.75:1 will give a good wide powerband. A rod stroke ratio of 2:1 will give a higher revving narrower powerband.

Hit Counter    18103