I have a bunch of 2-stroke engines and the websites that I found only tell me about 4-cycle engines. Do you happen to know the ratio of cc to HP?

  • Depends on who makes it, quality etc etc
    – Solar Mike
    Commented May 25, 2020 at 6:17
  • It doesn't need to be exact, just close.
    – asdfghjkl
    Commented May 25, 2020 at 6:37
  • A google search should give you all you need to know, names such as Husquvarna, Stihl, Brioggs & Stratton come to mind.
    – Solar Mike
    Commented May 25, 2020 at 6:49
  • A very broad rule-of-thumb would be that a 2-stroke produces twice the power of the same capacity 4-stroke engine, because it fires twice as often. Commented May 25, 2020 at 10:56

1 Answer 1


A quick google search gives: enter image description here

So, you can work out the power per cc for each and take an average. You might, of course, need to check out larger engines and see how the performance is affected.


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