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Compression?

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Vernon Graham

02-11-2000 22:27:10




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My dad had an International TD 35 TracTractor that started on gasoline then was switched to diesel. It seems incomprensible to me now, how he could hand crank that engine with the compression ratio it would have to have to operate on diesel.
Can anyone tell me what the compression ratio was and wheather the crank was direct to the engine or worked through gears?




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HR

02-14-2000 03:23:59




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 Re: Compression? in reply to Vernon Graham, 02-11-2000 22:27:10  
Vernon: The compression for the 4 cylinder MD's was lowered to about 6 to one. Still, your Dad had to be strong as most diesels had 250 cubic inchs or more and thats a lot of iron to crank by hand.....harvey



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Pat Cox

02-13-2000 04:31:00




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 Re: Compression? in reply to Vernon Graham, 02-11-2000 22:27:10  
Another thing to remember is that a diesel engine does not need as high a compression ratio (CR) to run as it does to start. Consider the starting condition with a diesel: you have to get the air hot enough to ignite the fuel spray, with the piston, cylinder, and head sapping heat from the air the whole compression stroke. Also, the compression stroke is slow on start, not only giving the air time to cool but also time to leak down past the piston and past the valves. By starting on gasoline, you have the engine warmed up and cranking rapidly when you switch to diesel. In a sense, the engine is it’s own starter.

I have an engine book that talks about compression ratio and diesel engines, and if I remember correctly, it says that the CR that is chosen for the engine is the lowest that will reliably start the engine. After it is started and warmed up, a diesel may run with a CR as low as 12. The compression stroke is rapid, and everything the air comes in contact with is hot.


Pat

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twopop

02-12-2000 06:26:19




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 Re: Compression? in reply to Vernon Graham, 02-11-2000 22:27:10  
I REMEMBER MY DAD HAD A 41 TD9 THAT HE SPENT ALOT OF TIME HAND CRANKING.I DONT HAVE THE EXACT FIGURES BUT THE DIESEL HAD TO BE AROUND 17 TO 21 TO 1 COMPRESSION BUT WHEN THE COMPRESSION RELEASE HANDLE ON THE LEFT SIDE OF THE DASH WAS PULLED DOWN THE COMRESSION RATIO WOULD CHANGE TO AROUND 7 TO 1 WHICH MADE IT POSSIBLE TO HAND CRANK.YES THE CRANK WAS DIRECT TO THE ENGINE



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Vernon Graham

02-12-2000 22:21:23




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 Re: Re: Compression? in reply to twopop, 02-12-2000 06:26:19  
You're right! I had forgotten about the lever on the dash. Thanks.



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Bob

07-04-2001 05:28:01




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 Re: Re: Re: Compression? in reply to Vernon Graham, 02-12-2000 22:21:23  
I've been looking at my TracTractor and didn't see the compression reliese on the Dash, although my International is in rough shape. I might not even have the same Tractor you are talking about. Mine did start on gas then you had to switch it to diesel with a lever on the side of the motor that was spring loaded. It is a 4 cyl. motor and a 3 lbs coffee can just bearly covers the cylinders.



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