nwcove
Admiral
- Joined
- May 16, 2011
- Messages
- 6,293
anyone have a good idea of how to guesstimate hp of a small engine using displacement ? online info suggests 15-18 cc for 1 hp. this works out great for a car engine but not well for a lawnmower etc. i calculate it to be about 35 cc's per hp. if my 35cc number is correct, would it work out for an OHV engine?, or do they make a bit more power than the old style b&s etc motors?