Flatheads, Lheads, sidevalves--most common like the old Fords, B&S have offset combustion chambers, slanted Quence areas at top of 2/3 of piston, not compact combustion chamber with even burn from spark plug point. this means a sudden jump in pressure at far end of combustion path sometimes and that means a bit of compression ignition/knock/detonation with higher compression. Harley WR 45 inch side valve with 35 to 40 hp as racers with 7.5 to 8.5 compression ratios while WLA had about 5.5 to one and 25 hp. Detonation was sort of acceptable for a racer running higher RPMs- 6000 rpm sometimes more but the airflow rate was bad then, the S curve of intake path with similar exhaust. WLA was about 4000 rpm, happiest at 1500 to 3000 rpm. Advantage of side valve wasn't performance , was size and economy in building engine with the one comparitive advantage over the OHV designs of lighter valve train mass. Some experiments 1980s with slightly higher compression and dual spark plugs- attempt to use existing tooling with minimal cost imporovements to meet California propose emmissions. Kohler LP gas had with second plug toward center, 1st plug at side of head next to gap between valves, 7.5:1 compression on K241 and K301 engines- 10% increase in power, even heat from the double spark source using ignition system first used on flathead Continental engine used in Piper Cubs. Ragged ignition path means odd heat points and sometimes hot spots at edge of valves. RN
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Today's Featured Article - On the Road with Dave Gohl: Deere Departed Friend - by Dave Gohl. Have you ever had to part with a dear friend? It's not easy. If it's due to death, your feelings could be in disarray for days, months or even years. Even now after almost 4 years, I still miss my dad. I remember when I was a kid my dad sometimes would tuck my brother and I in at night and we would ask him questions about his childhood on the farm. To this day, it's some of the best stories I've ever heard. And now, I'm so glad that I asked those questions, and if I were a little smarter i
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