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- Path: sparky!uunet!cbmvax!grr
- From: grr@cbmvax.commodore.com (George Robbins)
- Newsgroups: rec.railroad
- Subject: Re: Smokey Alcos?
- Message-ID: <37251@cbmvax.commodore.com>
- Date: 24 Nov 92 04:41:05 GMT
- References: <01GRGZ2Q65XE95OH2T@VAXC.STEVENS-TECH.EDU>
- Reply-To: grr@cbmvax.commodore.com (George Robbins)
- Organization: Commodore, West Chester, PA
- Lines: 32
-
- In article <01GRGZ2Q65XE95OH2T@VAXC.STEVENS-TECH.EDU> U93_PTUPACZE@VAXC.STEVENS-TECH.EDU (Prime Mover Software Development) writes:
- > Content-Transfer-Encoding: 7BIT
- > Mime-Version: 1.0
- > X-Vms-To: IN%"rec.railroad@silver.ucs.indiana.edu"
- >
- > The primary reason most Alcos smoke is due to the design of their
- > turbochargers. They work correctly, for the most part; however, a design flaw
- > in them allows the thick exhaust smoke to sneak past the turbocharger blades
- > into the stack and out of the engine. This phenomenon only occurs when the
- > engine is "notched out," or sped up. The engine immediately starts spitting
- > out more exhaust smoke, but the turbocharger is still spinning relatively
- > slowly. The turbocharger takes a few seconds to catch up to the correct speed,
- > and in the interim, smoke gets right around the blades.
-
- This sounds fairly spurious, given that turbo-chargers aren't particularly
- particulate eaters. The usual reasons for excessive smoking are:
-
- 1) Clearing of carbon/particlates that have been deposited during
- idle low flow/low temperature operation.
-
- 2) Poor atomization due to worn injector nozzles.
-
- 3) Excessive fuel/air mixture due to governer overtravel
- or limit mis-adjustment.
-
- You see all of these same problems any time you're following a
- real smoker of a tractor-trailer.
-
- --
- George Robbins - now working for, work: to be avoided at all costs...
- but no way officially representing: uucp: {uunet|pyramid|rutgers}!cbmvax!grr
- Commodore, Engineering Department domain: grr@cbmvax.commodore.com
-