Inliners International Forums General Discussion Engines 235 six horse power rating

There is a nice graph of the relationship between compression ratio and efficiency on the MIT web site -- http://web.mit.edu/16.unified/www/SPRING/propulsion/notes/node25.html
Scroll down to section 3.5.1.

Typical 235s are 7:1 ?
Typical 250s are 8.5:1 ?

Also don't forget that the 235s weigh 150 lbs or so over the 250s.


regards,
Leon