[Gasification] Prime movers -- The Slow Go diesel concept

[Arnt Karlsen]

On Wed, 02 Aug 2006 20:55:22 +0100, AJH wrote in message 
<1uv1d2t885rhfp11g1a5a79m2tnop7bf1k at 4ax.com>:

> On Wed, 2 Aug 2006 11:14:50 -0700, jim mason wrote:


> The killer with running an engine lightly loaded and at high idle is
> that the operating temperatures get low enough for compounds to
> condense in the bore, causing bore glazing. This means the rings don't
> bed into the bore properly and you get both blow by and lubricating
> oil entering the combustion chamber.

..a variant of this failure has claimed quite a few old war birds; they
were typically run at low power settings and rpms to save money, 
both on fuel and maintenance.  Which works nicely until an engine fails
on take-off or on an aborted landing, which is when any sanely trained
pilot will "shove all forward on the good one to save the good ole
bird", throwing the piston rings a wee bit further up-n-down the bores,
where they get to meet-n-gnaw its way up those reasonably freshly honed
unworn metal uh-oh ridges.  

..even if big Asian irons are sturdier than Yankee V-12's 'n twin row
radials, cutting rpm's by over 50% and then speeding up again, will
throw your piston rings further than what "just 15%" will do.

-- 
..med vennlig hilsen = with Kind Regards from Arnt... ;o)
...with a number of polar bear hunters in his ancestry...
  Scenarios always come in sets of three: 
  best case, worst case, and just in case.