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Old 09-12-2012, 04:57 AM   #21 (permalink)
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Quote:
Originally Posted by Diesel_Dave View Post
Diesels typically aren't as optimized for reduced pumping losses (high VE) as you might think. In typical spark-ignited naturally aspirated gassers, high VE is pretty much the only way to get more torque at any given speed. So if you want to get more torque you pretty much have to increase the VE. On a diesel however, you can just add a little more fuel and/or a little more boost and you'll get the torque. Sure the FE will be sub-optimal, but it's just so much easier than redesigning heads and intakes.
It just goes to show you how well the efficiency concept of a combined cycle intercooled turbodiesel engine works.
They started off real efficient and cranked out amazing power levels with out much added complexity or engineering.
Fuel economy didn't matter much as diesels could beat their gas fuelled counterparts with ease in head to head tests and on top of that diesel fuel was quite a bit cheaper than gas until about 10 years ago.
But times are changing and with diesel fuel prices projected to soon rocket past $4/gal in the U.S., adaptations need to be made.

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Old 09-13-2012, 02:03 PM   #22 (permalink)
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I have read some large diesel engine papers that show loss of efficiency when intake air temperatures start to drop below 30'F to 40'F.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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Old 09-14-2012, 02:07 PM   #23 (permalink)
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Diesel pr0n

tuned intake, exhaust header, turbo, monster intercooler, and a blower.
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Old 09-14-2012, 02:08 PM   #24 (permalink)
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Quote:
Originally Posted by oil pan 4 View Post
I have read some large diesel engine papers that show loss of efficiency when intake air temperatures start to drop below 30'F to 40'F.
I have read some that they are good down to -5F
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Old 09-14-2012, 03:32 PM   #25 (permalink)
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Quote:
Originally Posted by ConnClark View Post
Diesel pr0n

tuned intake, exhaust header, turbo, monster intercooler, and a blower.
That's a whole lotta hardware just for a clanky old 617.952. I wonder if they got more than 200hp or 200 hours of life out of it....
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Old 09-14-2012, 03:40 PM   #26 (permalink)
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That's a whole lotta hardware just for a clanky old 617.952. I wonder if they got more than 200hp or 200 hours of life out of it....
They got a tad over 400 HP.

200 hours of life might be right. They made a couple of videos one of a drag race and one of it doing doughnuts. After which it disappeared only to reappear with a om603 engine.
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Old 09-20-2012, 03:09 PM   #27 (permalink)
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I was reading my cummins manual today and apperantly cummins recomends that when operating at +20'F or less to locate your intake inside the engine enclosure.
Also to use grill shutters below 32'F and a winter front below 0'F.
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1984 chevy suburban, custom made 6.5L diesel turbocharged with a Garrett T76 and Holset HE351VE, 22:1 compression 13psi of intercooled boost.
1989 firebird mostly stock. Aside from the 6-speed manual trans, corvette gen 5 front brakes, 1LE drive shaft, 4th Gen disc brake fbody rear end.
2011 leaf SL, white, portable 240v CHAdeMO, trailer hitch, new batt as of 2014.
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Old 09-20-2012, 03:26 PM   #28 (permalink)
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Doesn't this kind of go against the theory of super VE? Cold air is more dense so you get more air in the engine which is what super VE is about, right?
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Old 09-20-2012, 05:06 PM   #29 (permalink)
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Diesels require heat for efficient combustion, and they already run with an excess amount of air. So colder air will not improve performance in the way it will for a gasser.
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Old 09-20-2012, 05:41 PM   #30 (permalink)
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The concern is that for super cold air you can start to extend to combustion delay and start getting bad combustion (white smoke, etc.). It's not as much of an issue on the newer common rail engines as it used to be on the older diesel with mechanical fuel injection and low fuel pressures.

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