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03-31-2012, 07:55 PM
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#2 (permalink)
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Master EcoModder
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It's neat that they preheat the fuel to 250C.
Best auto engine is 43% I think, a 5 cyl Audi.
regards
Mech
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03-31-2012, 10:02 PM
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#3 (permalink)
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(:
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They run that icky bunker fuel right?
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04-01-2012, 01:18 AM
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#4 (permalink)
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Master EcoModder
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read the article.
they run pretty much anything which burns and is liquid or vapor.
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04-01-2012, 01:35 AM
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#5 (permalink)
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(:
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Love to but this computer doesn't do pdfs.
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04-01-2012, 11:36 AM
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#6 (permalink)
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Corporate imperialist
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Lets gear our diesels to a turn a little slower.
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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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04-01-2012, 12:07 PM
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#7 (permalink)
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Master EcoModder
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I wonder what makes them so efficient. They stopped producing 2-cycle diesels for trucks in the late 80s because they were so inefficient and wouldn't meet emissions.
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04-01-2012, 01:52 PM
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#8 (permalink)
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...beats walking...
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Quote:
Originally Posted by mechman600
I wonder what makes them so efficient. They stopped producing 2-cycle diesels for trucks in the late 80s because they were so inefficient and wouldn't meet emissions.
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... inefficient? No. Two-stroke engines don't "waste" separate 'intermediate' cycles for intake and exhaust, so they are roughly twice as powerful for their size as four-stroke engines...and weigh less too.
... emissions, yes, they're terrible. |
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04-01-2012, 03:45 PM
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#9 (permalink)
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aero guerrilla
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As has been mentioned here a few times, new 2-stroke engines with fuel injection are much cleaner (hydrocarbons were the old 2-strokers' sin, iirc). You can find them in some snowmobiles, and Peugeot makes a scooter with a FI'ed 2-stroke (diesel?).
As for the large, slow-turning diesels' efficiency, my guess is that two things are a helping factor: - Low rpms -> lower friction losses,
- Very large displacement -> less surface area (per volume) through which heat can escape.
Does anyone have any idea at how hot those engine run? I mean, what are the typical coolant and exhaust gas temperatures?
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e·co·mod·ding: the art of turning vehicles into what they should be
What matters is where you're going, not how fast.
"... we humans tend to screw up everything that's good enough as it is...or everything that we're attracted to, we love to go and defile it." - Chris Cornell
[Old] Piwoslaw's Peugeot 307sw modding thread
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04-01-2012, 03:56 PM
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#10 (permalink)
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Master EcoModder
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Inefficient in trucks, yes. The notoriously thirsty Detroit diesels of yore basically converted fuel into noise. Obviously their fuel injection systems were more crude than what is possible now. Maybe it was the duty cycle of the average truck (not a steady load at rated speed) that led to the demise of the screamin' demon.
I am well aware of the effects of modern technology coupled with the lowly two stroke. Piwoslaw: the Peugeot scooter you mention is a gasoline engine, not a diesel. With direct injection, it blows equivalent 4-stroke scooter engines away in power, economy and emissions.
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