93EXCivic wrote: Do those two stroke diesels take pre-mix?
No, they have oil in the crankcase. See here for how a two stroke diesel works. http://auto.howstuffworks.com/diesel-two-stroke1.htm
93EXCivic wrote: Do those two stroke diesels take pre-mix?
No, they have oil in the crankcase. See here for how a two stroke diesel works. http://auto.howstuffworks.com/diesel-two-stroke1.htm
In reply to 81cpcamaro:
There's one inaccuracy in that article as it relates to the engines we are discussing. If the engine isn't turbocharged, the pressure of the intake air at the time the piston closes the intake ports is ambient. The blower is not a supercharger, it is used solely to scavange the air, meaning to push the exhaust gas out and intake charge in. If the timing gears that are used to turn the blower are modified, then a small supercharging effect can be had, but they aren't that way from the factory. If the engine is turbocharged, then the article is correct.
bravenrace wrote: In reply to 81cpcamaro: There's one inaccuracy in that article as it relates to the engines we are discussing. If the engine isn't turbocharged, the pressure of the intake air at the time the piston closes the intake ports is ambient. The blower is not a supercharger, it is used solely to scavange the air, meaning to push the exhaust gas out and intake charge in. If the timing gears that are used to turn the blower are modified, then a small supercharging effect can be had, but they aren't that way from the factory. If the engine is turbocharged, then the article is correct.
Actually the scavenging is accomplished by pressurized air forcing the mixture out the exhaust valves. The pressure is very low but still pressure. Turbos are used on two strokes diesel to increase performance without having to modify the blower gear drive system. Here are 4 sites found in a search that explain it pretty good.
http://www.maritime.org/fleetsub/diesel/chap6.htm
http://www.first-hand.info/TwoStrokeCycleDieselEngine.html
http://blogs.howstuffworks.com/2010/04/07/how-a-2-stroke-diesel-engine-works-or-lots-of-diesel-power-in-a-small-package/
http://www.cdxetextbook.com/fuelSys/intakeExhaust/systems/dieselinduction.html
I love the sound our old Detriots made, though I'm sure the people in the apartments I used to scream past at night may not miss them as much.
In reply to 81cpcamaro:
Have you ever worked on one of these, or do you just search for links? It's on the internet so it must be correct!!!
Yes, okay, there has to be some minute amount of pressure, or the air wouldn't move. My intent was to point out that it isn't enough to supercharge the engine, which the article I read could mislead a reader into thinking. Any more nits you want to pick?
bravenrace wrote: In reply to 81cpcamaro: Have you ever worked on one of these, or do you just find links to inaccurate information? It's on the internet so it must be correct!!!
So exactly how is the information inaccurate? I didn't read anything in the links that said the blowers were superchargers/power adders, just necessary for operation. I was just pointing out that the air in the intake tract was above ambient pressure, that's all.
81cpcamaro wrote:bravenrace wrote: In reply to 81cpcamaro: Have you ever worked on one of these, or do you just find links to inaccurate information? It's on the internet so it must be correct!!!So exactly how is the information inaccurate? I didn't read anything in the links that said the blowers were superchargers/power adders, just necessary for operation. I was just pointing out that the air in the intake tract was above ambient pressure, that's all.
What you didn't notice is that I edited my post. Apparently while you were writing yours.
Yep, I see it now, thanks.
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