funny domed piston? More of 'dome' to side away from valvles? High compression for the side valves/flathead engines, need to be matched for the heads. you get a 'quence area away from the valves, a 'pocket' around the spark plug that is maybe 10-20% of old combustion chamber- meaning a possible 6.5 or 7:1 compression instead of 5, 5.5 to 1 compression that might have been standard on a distillate or 'all Fuel' engine. Still have a relief underside of head so minimal restriction on intake stroke. If you want to hot rod a flathead engine the old ford hot rodding boks can help some- batter is the Harley K and WR rebuilding, tune up and piston work details. For a Kohler in a Cub Cadet a properly set up K241 with relieved cylinder lipp, LP gas head and popup piston will have about 7:1 compression and next size engine K301 horsepower. Continental /AC G 61 inch engine with the LP pistons can use unleaded premium non-ethanol 91 octane quite well. One domed piston might need a bit of checking on spark plug, but since Cub would run a bit rich anyway would be no real concern, would give just a little more power, might not notice it. Current gasoline even the cheap stuff a couple points mhigher octane than old designs for the mixed distillate- problem for many was the lead used as lubricant. Welch recommends 2 stroke oil premix at 100:1 for general use on older tractors with the soft valve seats, some of old Harleys used that mix with unleaded premium and BMW R60, R50/2s would run happily on that mix. Ford Ns had stellite exhaust valves to begin with, JD 2 bangers tended to ru nso slow that unleaded din't bother them- other flathead engines varied, some Continentals had hard exhaust seats like fords, others had the 'soft' iron seats that would erode at 2000 rpm like the OHVs. RN.
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Today's Featured Article - On the Road with Dave Gohl: Auction Musings - by Dave Gohl. I was thinking the other day about all the auctions I've been to in the last few years. There've been many. Some have been very good, some have been well, disappointing to say the least. But no matter how good or bad auctions may be, we always seem to stay until the item we've come for or are interested in is on the block. I've been to some auctions near and far. I think the furthest has been the Two Cylinder 7 in the Amana Colonies last year. Lots of stuff, lots of people. I've also atten
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