Running the motor lean hurt it?

Sirdavidliesalot runs his motor so lean that it hasent ran for many years now and will never run again.
 
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Jim Fulmer said:
If you run a diesel lean on the bottle you will see some plasma torch EGT's......like 2K!
Click to expand...

Hot enough to torch through a wrist pin....sho nuff.
EDIT...I see Dave already posted those pics.
 
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Also...lets try to keep the tech sections filled with tech..not old grudges and useless BS.
Thanks.
 
moisture in fuel? could that be the culprit or am I way off! or even humidity?
 
I am still confused. I can see how nitrous would make a diesel run lean if there is not a enough #2 in the cylinder.

I know that the air fuel ratios change on a diesel and are not limited to a small window.

So what exactly is the concensus of running a diesel motor lean. Is it possible or not (excluding nitrous)?

Thanks
Adam M.
 
Ok so basically they are always running somewhat rich then, even if there is no black smoke coming out the exhaust?

Adam M.
 
You are actually asking two different questions:

1. Can you run a diesel engine lean and hurt it?

2. Can you run it lean?

In response to question #1, not on #2 only. Add nitrous or alcohol to the mix, and all bets are off. The reason that nitrous can hurt parts by running lean, is that you have unused oxygen, AND lots of heat. Take either of those away, and the problem goes away.

Question #2. If your definition of running lean is more air available then required for a stoic mixture, then yes. It is possible to have diesel fuel burn at a AF ratio leaner then stoic. Will it hurt parts? No. Will it increase NOx emissions? Yes. One of the reasons for variable turbos (besides spoolup), is to actually reduce the air going into the engine under certain conditions (light load, high rpm, for example), to reduce NOx emissions.

Paul
 
BrettWINspeed said:
Here one example is:doh:
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I still remember that day. First dyno event I'd ever been to. Cold as hell.

my buddy was in the bathroom when that happened, scared the crap out of him (bathroom was right next to the rollers.)
 
You just haven't fully enjoyed N2O until you have destroyed your exhaust and the hearing of everyone around you :rockwoot:
 
BrettWINspeed said:
Here one example is:doh:
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hey that looks all too familiar, did one like that myself. but it wasn't on the dyno, it was dark out and it lit up the whole street corner. my passenger just about :aiwebs_013: himself
 
paulb said:
You are actually asking two different questions:

1. Can you run a diesel engine lean and hurt it?

2. Can you run it lean?

In response to question #1, not on #2 only. Add nitrous or alcohol to the mix, and all bets are off. The reason that nitrous can hurt parts by running lean, is that you have unused oxygen, AND lots of heat. Take either of those away, and the problem goes away.

Question #2. If your definition of running lean is more air available then required for a stoic mixture, then yes. It is possible to have diesel fuel burn at a AF ratio leaner then stoic. Will it hurt parts? No. Will it increase NOx emissions? Yes. One of the reasons for variable turbos (besides spoolup), is to actually reduce the air going into the engine under certain conditions (light load, high rpm, for example), to reduce NOx emissions.

Paul
Click to expand...

Ok that clears it up. I guess i was asking two questions really becaues at first i was under the assumption you can run a diesel lean, but then it turned into can you even run it lean. Thanks for clearing that up for me.

Just curious...What would be a lean air to fuel ratio for a diesel?

Adam M.
 
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