[Gasification] SFC for De-rated EnginesWas:smallscalegasifiers for those that need them

[gfwhell at aol.com]

Crank case compression on large 4 stroke diesel engines is avoided as a safety measure, one of the ships I was on had fiber board panels installed on 
both sides of the lower crank case. the crank case is normally aspirated to a negative pressure, to avoid destructive?explosions. when an explosion does occur, due to the ignition of hot oil mist being ignited within the crank case. the fiber boards blow out "fairly" harmlessly. much better than having cast iron shrapnel.
On the other hand a greater danger exists with worn rings, because this can cause the engine to "run amok", Other than preventing air from being sucked into the upper combustion zone the engine can explode due to centrifugal force. getting all the fuel and air it needs from the crank case.This can be a very traumatic experience.

GF


-----Original Message-----
From: Peter Singfield <snkm at btl.net>
To: Discussion of biomass pyrolysis and gasification <gasification at listserv.repp.org>
Sent: Sun, 1 Jul 2007 9:48 pm
Subject: Re: [Gasification] SFC for De-rated EnginesWas:smallscalegasifiers for those that need them



At 06:04 PM 7/1/2007 -0700, you wrote:
>Harmon,
>
>I may be confused, but it was my impression that crankcases are normally
>vented, except in the case of two-cycle engines which use the downward
>stroke of the piston to force a fresh charge into the combustion chamber.
>
>Mark
>

Not to start a major argument -- but single cylinder old style Listers and
single cylinder chinese diesels have no "back" pressure in the crank case!!

Inertia due to rapid reversal of direction of piston travel "sets" the rings.


Peter/Belize

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