Not sure how you got 250 CID in an M, stock bore is 3-7/8", only over-size anymore is 4" for 264 CID. By 1951 IH was supplying distributors instead of magnetos, so your mag was an option. Honestly, the mag is better for starting, when cranking with 12v your ignition with distributor is only getting 9-10 volts. With 6v system probably only getting 4 volts when starting. With mag you get same strong spark every time. I get tired of these experts bragging about "My Farmall A starts fine on 6 volts." Add a live hyd pump, power steering pump, cold thick oil, and oversize high compression pistons in an engine over twice the displacement. Hey, come on over and I'll let you hand crank the beast over next time it's Below Zero! IH didn't make too many Farmall 400's before they switched to 12 volts. They used 12 volts on diesel and LP tractors. I'm happy these guy's tractors start on 6 volt, but still have to agree with Old Tanker that the day of the 6 volt is long gone. A 12 generator cures a hard start condition but you still have the electro-mechanical voltage regulator which is prone to failure. I've owned dozens of cars and trucks, tractors, lawn mowers, and most have had alternators, drove hundreds of trucks over the years, and only had a hand full of alternators fail on me. Most common failure is a diode failing and it stops charging. Did have a bearing lock up and alternator stop turning on the wife's car one night, lights dimmed and belt started screeching. Normally takes over 200,000 miles before one fails.
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Today's Featured Article - Engine Valves - Some Helpful Information - by Staff. Intake - On the intake stroke the piston moves doward, sucking in carburized fuel through the open intake valve. Exhaust valve is closed. Compression - With both the intake and exhaust valves closed, the pistons upward stroke compresses or squeezes the fuel into the combustion chamber. Firing - Ignited by the spark, the compressed fuel explodes and forces the piston downward on its power stroke. Intake and exhaust valves are closed. Exhaust valves and seats are exp
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