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Old 12-07-2015, 07:58 PM   #1
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Why was indirect injection created?

I was curious why indirect injection was created and still used when direct injection has proven to be better?

I can't see it being any cheaper to create a pre-combustion chamber in a cylinder head.

I've noticed that many small compact diesel tractors under 40hp still use the indirect injection style engines. I don't know the pros and cons of either so please no bashing. Just trying to learn
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Old 12-07-2015, 08:42 PM   #2
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Overall it is a quieter smoother running engine without the clatter. Overall less hp and torque are usually the byproduct.
 
Old 12-08-2015, 05:39 AM   #3
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Its a way of making a lower compression diesel fire Iirc.. It's got something to do with the burn starting in the injection pocket & ignighting the rest of the fuel
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Old 12-08-2015, 07:22 AM   #4
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Quote:
Originally Posted by John Robinson View Post
Its a way of making a lower compression diesel fire Iirc.. It's got something to do with the burn starting in the injection pocket & ignighting the rest of the fuel
They also use it a lot on higher compression engines to make it easier on the engine. It effectively gives them a pre-injection to lessen the combustion spike, and quiet them down.

Indirect injection diesels were basically built on the same blocks as early gas engines, and were a radical improvement on the older oil engines that started on gas, then switched to kerosene or diesel at 7.0:1 compression or so. Those engines would live forever, and ran with more torque than when on gas, but were a real pain to get started, and had lots of extra parts. Mostly use in dozers and power units back in the 30's and early 40's before the GM 2 cycle became king of diesel.

Indirect injection diesels wouldn't be nearly as problematic today with fuel quality and cetane levels where they were in the 40's throught the 60's. Allis Chalmers listed minimum cetane at 58 for their Buda Diesels in the 50's and 60's...I'd love to be able to find anything about 40 today.

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Old 12-08-2015, 01:27 PM   #5
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also Indirect ran at lower injection/line pressures. cheaper.
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Old 12-08-2015, 01:34 PM   #6
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