Posted by Steven f/AZ on January 05, 2008 at 07:13:36 from (24.121.155.84):
In Reply to: diesel cold starting posted by KEH on January 05, 2008 at 06:58:32:
On our 806, 1256, 1086 IH, 2590 Case, 8630 and 4450 John Deere all have ether as a start assist. Nice can holder under the hood and a button on the dash. Get the engine spinning over and give 'em a sniff and they always fire up. I'm not sure what the latest diesel tractors use.
Glow plugs, pony motors, and start on gas diesels were necessary because of a couple of things... 1.) They did not have enough compression when cranking to really ignite the diesel fuel. They were around 17:1 while newer diesels can be up to around 24:1 2.) Their injector pumps did not develop enough pressure when cranking to really atomize the fuel - also partly the fault of the injector design. Old injector systems were around 2500 to 3500 psi - new injector systems run near 25,000 psi on a common rail (maybe higher?).
The technology for building engine parts that hold up to the stress of high compression and high fuel pressures and also the accuracy of fuel injected is the reason the newer diesels start better, and run quieter.
I can tell you this much, my brother's 98 Cummins has the intake manifold heater system that kicks on when you turn the key on no matter what the temp is. It will start down to 35 below zero with no other assist.
His 06 Cummins won't even kick on the manifold heater until it's down around 5 above. I don't think he has plugged it in unless it gets below zero, and I doubt he has tried to start it unplugged at as low of a temp as the 98.
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