[urq] Damaged cylinder walls caused by sand?

[fdekat]

> 
> Message: 2
> Date: Tue, 5 Jan 2010 00:55:35 +0100
> From: "Maurits Jonkergouw" <urquattro at moregraphics.nl>
> Subject: Re: [urq] Damaged cylinder walls caused by sand?
> To: "Audifans" <urq at audifans.com>
> Message-ID: <001701ca8d99$764449e0$4001a8c0 at sp408076>
> Content-Type: text/plain;	charset="iso-8859-1"
> 
> Thanks guys for the quick replies.
> 
> After reading all your responses, I feel the need to be a little more
> specific...
> 
> First of all, there is nothing wrong with the new rebuilt engine (as it's
> not running
> yet), it was my old 300K KM engine which had been opened up and damaged by
> possibly sand
> and the very reason for the rebuilt in the first place.
> 
> And yes, I did use the same PiperCross air filter for over 8+ years and
> cleaned it only
> twice if I remember correctly, but I'm 100% sure I never soaked it with oil
> after I washed
> it out, so I guess it must have been less effective each year without the
> proper
> maintenance... my bad, very bad...

Ok, so what you have added makes more sense..  :-)

I too had been *very bad*. I came upon a killer deal for a set of triple
weber carbs and a manifold for my Triumph TR6. (But no air cleaners!)

I immidiately bolted the setup on, and took if for a 'drive', fully intending
to purchase the required aircleaners.  Well, you know how things like that
go!  Can't see the carbs, so 'out of sight, out of mind'..

Drove it without air cleaners for two summers, including at a fair clip down
some sandy rally roads (TR6 was *NOT* happy with that. It likes SMOOTH
roads!)

End result?  COmpression started going down, and crankcase was starting to
pressurize a bit.  Teardown revealed nothing obviously wrong, but cylinder
bores looked like they had been 'rough honed', or gone over with really fine
sandpaper. No grooves in the cylinder walls, but not a smooth and shiny
finish to the bores either.

So lesson learned: yes, an excellent idea to run with a good airfilter setup!

=Frank de Kat=