Hope someone finds it an interesting read, sorry if it’s been posted before.
http://www.bridgestonemotorcycle.com/documents/oilpremix6.pdf
http://www.bridgestonemotorcycle.com/documents/oilpremix6.pdf
Oil Ratio - 16:1 = Most Power?
- Thread starter Vintage Engine Repairs
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Tomos770
ArboristSite Guru
I find that BLACK&WHITE picture of sparkplugs of different oil ratios amusing... 
Great article, takes me back to the days when I had a subscription to Cycle magazine. Any article by Gordon Jennings was worth paying attention to.
This has been well known for a very long time.
Kart racers had it down to 18:1 I believe for making the most power.
when Karting I just used 16:1
Which is all really close to the old 20:1....
Right. I was just going by what I had seen in the past of them doing dyno runs. Anything within a couple numbers is going to be very similar
. I would think in a small chainsaw that a slightly higher ratio probably makes more power due to lighter moving parts but I could be wrong
I have no proof etc or dyno's.
Just seat of the pants test cuts with my gas race saws for cut times back in the day. . When running my cocktail gas mix I settled on 24:1 for race saws.
Can see that can marked even though no race saws in that load. .
Just seat of the pants test cuts with my gas race saws for cut times back in the day. . When running my cocktail gas mix I settled on 24:1 for race saws.
Can see that can marked even though no race saws in that load. .
That is what I was thinking would be likely the most power in a sub 120 cc chainsaw. But it probably depends on the oil viscosity as well
