![]() 06/27/2017 at 22:12 • Filed to: None | ![]() | ![]() |
Why is it that when you have a diesel that won’t start. Sometimes you can get it to start by covering the tailpipe? I’m not crazy this a thing I’ve done and seen other people do many times while nothing else worked.
The exact vehicle in question would be a regular humvee. NA V8 with single exhaust, and apart from the muffler, no other exhaust components (That I know of.)
I’ve asked several mechanics and the best answer I got was that the Army worked with Lockheed Martin to develop a device that goes in the tailpipe and sucks the life energy out of the soldier who puts his hands over it and uses it to start the truck.
![]() 06/27/2017 at 22:13 |
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More pressure in the combustion chamber => better chance of combustion
![]() 06/27/2017 at 22:13 |
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Maybe it keeps extra fuel in the cylinder by limiting scavenging? I dunno.
![]() 06/27/2017 at 22:19 |
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But it shouldn’t make a difference since both valves would be closed.
![]() 06/27/2017 at 22:21 |
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Although I guess that would work if timing was off.
![]() 06/27/2017 at 22:22 |
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If you cover the tailpipe, pressure will build
![]() 06/27/2017 at 22:22 |
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At 28:1 compression ratio, seems to me that plugging the exhaust would be a trivial factor.
![]() 06/27/2017 at 22:56 |
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More fuel stays in the chamber, not as much of anything leaves the chamber. Not as much leaving means not as much coming in. Which means less cold ambient air coming in. Which means the air already there is free to increase in temperature, which is crucial to diesel combustion.
![]() 06/27/2017 at 23:03 |
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I had a dedicated pair of gloves just for this purpose. Korea gets cold.