Darn Fossil, I hate to disagree with you, but...
The Deeres actually fired like a 3-cylinder with one cylinder missing. So the timing, assuming as you did, the first firing at 0 degrees in a 2 revolution, 720 degree cycle, the cylinders would fire at 0 and 240 degrees, with a gap of 480 until the next firing.
The Deere engines were huge, the early "D" models were about 460 cubic inch (230 per cylinder) and turned pretty slow. I think they put out about 30hp at around 800 rpm. The size, and the lopsided firing sequence, coupled with huge flywheels, gave them lots of torque, according to the engineers of the day.
The "D" was one of the longest-lived of any tractor model, prouced from 1923 to 1953. The 2-cylinder design was even older, and originated with the Waterloo Boy tractor company in about 1912. Deere bought Waterloo, and those early 2-cylinders are highly prized by collectors. Not many of them survived WWII scrap drives.
The 2-cylinder design lived at Deere until 1963, when the "New Generation" 4010 6-cylinder diesel debuted. The 2-cylinder had been produced in tons of sizes and designs and at HP of up to 75hp in diesel versions.
The "New Generation" tractors were a whole different story, as some surveys put the Deere 4020 in as "Best Tractor Ever Made". As I grew up on the first 4020 sold between Amarillo and Big Spring, I have to agree.
Deeres were notoriously hard to start, especially when cold. That's the big reason for the gas tank, because the more volatile gasoline made for easier cranking.
There were no magneto adjustments on the Deere, so to start, you began by opening the cylinder petcocks. These relieved pressure in the cylinder, and made the tractor easier to start. Then you turned on the gasoline, gave it full choke, then brought the huge flywheel (on the left side of the tractor) up to just before TDC of cylinder one.
The trick at that point was not to spin the wheel fast, but to flick it across the "hump" of TDC compression of cylinder one. If you were lucky, it would catch a little on cylinder one, fire well when #2 rolled up, and be running when #1 came back up. Then you closed the petcocks, which by this point are spewing air/gas constantly. Then you turn the fuel to kerosene when the engine warms up.
The very very early "D"s had flywheels with spokes (highly desired by collectors). These were soon replaced with smooth disk flywheels, which I presume were safer to start...less chance of catching an arm in the flywheel.
[This message has been edited by CanyonAg77 (edited 11/27/2006 1:31p).]
The Deeres actually fired like a 3-cylinder with one cylinder missing. So the timing, assuming as you did, the first firing at 0 degrees in a 2 revolution, 720 degree cycle, the cylinders would fire at 0 and 240 degrees, with a gap of 480 until the next firing.
The Deere engines were huge, the early "D" models were about 460 cubic inch (230 per cylinder) and turned pretty slow. I think they put out about 30hp at around 800 rpm. The size, and the lopsided firing sequence, coupled with huge flywheels, gave them lots of torque, according to the engineers of the day.
The "D" was one of the longest-lived of any tractor model, prouced from 1923 to 1953. The 2-cylinder design was even older, and originated with the Waterloo Boy tractor company in about 1912. Deere bought Waterloo, and those early 2-cylinders are highly prized by collectors. Not many of them survived WWII scrap drives.
The 2-cylinder design lived at Deere until 1963, when the "New Generation" 4010 6-cylinder diesel debuted. The 2-cylinder had been produced in tons of sizes and designs and at HP of up to 75hp in diesel versions.
The "New Generation" tractors were a whole different story, as some surveys put the Deere 4020 in as "Best Tractor Ever Made". As I grew up on the first 4020 sold between Amarillo and Big Spring, I have to agree.
Deeres were notoriously hard to start, especially when cold. That's the big reason for the gas tank, because the more volatile gasoline made for easier cranking.
There were no magneto adjustments on the Deere, so to start, you began by opening the cylinder petcocks. These relieved pressure in the cylinder, and made the tractor easier to start. Then you turned on the gasoline, gave it full choke, then brought the huge flywheel (on the left side of the tractor) up to just before TDC of cylinder one.
The trick at that point was not to spin the wheel fast, but to flick it across the "hump" of TDC compression of cylinder one. If you were lucky, it would catch a little on cylinder one, fire well when #2 rolled up, and be running when #1 came back up. Then you closed the petcocks, which by this point are spewing air/gas constantly. Then you turn the fuel to kerosene when the engine warms up.
The very very early "D"s had flywheels with spokes (highly desired by collectors). These were soon replaced with smooth disk flywheels, which I presume were safer to start...less chance of catching an arm in the flywheel.
[This message has been edited by CanyonAg77 (edited 11/27/2006 1:31p).]