02-04-2020, 11:31 PM
Man was I glad to rid myself of those lame engines about 15 years ago. The castings are very porous and many had horrible air leaks. The motors were not fast enough to compete with the same type of Italian engines. I guess if there was an LMR only class then maybe would be competitive.
I am sorry those that were modified still got beat my any decent Komet, Corsair, Parilla, BM, Atlas, Hewland, and even some older Saettas still running at that time. In stock form could run with a Corsair T72. But when the Komet K55 and Atlas made their debut that LMR got spanked.
After going thru several, one thing I could see was a big problem(if you didnt have major air leaks) is how opened up the transfer passages and feeders were. Stock reeds were too thick. The only time I got one running well is after punching it out to a 55 mm piston from a B-bomb. Added another spark plug and used two Motoplats. Ran the coldest plugs I could get. Motorcraft AG203. At least there was some decent crankcase pressure then. That was back before the days of third bearing supports, so this particular motor had a tendency to break the pto crank half. But with the two mag side cranks for ignitions, I added an adapter shaft and third bearing cover.
Scott Pruitt ran a pair in the Long Beach Gran Prix, if I remember correctly. After that I never saw them at big races.
I am sorry those that were modified still got beat my any decent Komet, Corsair, Parilla, BM, Atlas, Hewland, and even some older Saettas still running at that time. In stock form could run with a Corsair T72. But when the Komet K55 and Atlas made their debut that LMR got spanked.
After going thru several, one thing I could see was a big problem(if you didnt have major air leaks) is how opened up the transfer passages and feeders were. Stock reeds were too thick. The only time I got one running well is after punching it out to a 55 mm piston from a B-bomb. Added another spark plug and used two Motoplats. Ran the coldest plugs I could get. Motorcraft AG203. At least there was some decent crankcase pressure then. That was back before the days of third bearing supports, so this particular motor had a tendency to break the pto crank half. But with the two mag side cranks for ignitions, I added an adapter shaft and third bearing cover.
Scott Pruitt ran a pair in the Long Beach Gran Prix, if I remember correctly. After that I never saw them at big races.