Posted by jdemaris on January 04, 2011 at 13:44:11 from (67.142.130.33):
In Reply to: Re: Pertronix Installed posted by Mike Aylward on January 04, 2011 at 13:10:51:
I've been told that having two huge combustion chambers, instead of four little ones makes an engine much more forgiving with compression ratios, low octane fuels, etc. Can't say I ever experimented with it though. All my attempts with high compression in Deere gas engines were with 300 series Dubuque engines. At the time, high-altitude pistons weren't any more expensive then standard. We tried it in a few 2020s, 2510s, etc. In this area with 1300 feet elevation, it was disaster when those engines got worked hard.
Does make me wonder though, why Deere didn't do it themselves with the two-cylinder series. By the time Oliver broke all records with their 8.5 to 1, Deere hadn't made a two-banger in North America for 6-8 years.
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