[s-cars] Fwd: Engine completey hosed

[K Hayes]

When #4 was firing, #5 should have had a valve open, right?  So  
expansion gasses would have either gone into the intake manifold or  
exhaust manifold.  Exhaust manifold no problem other then weird back  
pressure, but what would that do to the intake manifold and other  
cylinders.  Dave, what does the intake manifold look like inside?

Kenny Hayes


On Jan 18, 2009, at 11:05 AM, Calvin Craig wrote:

I would think that the flame travel appearing as detonation and  
therefore
putting downwards pressure on the piston as it was coming up may have  
caused
the broken up piston.  Too bad we don't have individual pressure  
monitors on
each combustion chamber :)

--Calvin

   -----Original Message-----
   From: djdawson2 at aol.com [mailto:djdawson2 at aol.com]
   Sent: Sunday, January 18, 2009 8:40 AM
   To: calvinlc at earthlink.net; forgied at shaw.ca; s-car-list at audifans.com
   Subject: Re: [s-cars] Engine completey hosed


   Eh...

   As they say, stuff happens.  Having the car flatbedded for 700  
miles and
arranging alternative travel for the occupants probably would have  
cost me
nearly as much as cleaning up this mess.  Part of me knew that when I  
was
making the trip back home.

   I would agree that the flame travel is what caused the burn... and  
that it
started with the headgasket.  But I am still wondering why it burned  
up a
piston.  The damage to my head is very minor... nothing like the pics  
in the
link that Dave F sent.  I am certain the head is repairable.

   Oh well... I did get 60k fun and fast miles out of it, and I'll  
get many
more once I get this resolved.

   Dave





   -----Original Message-----
   From: Calvin Craig <calvinlc at earthlink.net>
   To: djdawson2 at aol.com; forgied at shaw.ca; s-car-list at audifans.com
   Sent: Sun, 18 Jan 2009 1:05 am
   Subject: RE: [s-cars] Engine completey hosed


Dave,

Is it possible that the headgasket breached between two cylinders  
thereby
allowing the flame front to travel from one cylinder to another.   
This would
explain the "detonation" because one cylinder would see it as a
pre-detonation event.  I could see how doing that for 700 miles would  
cause
a problem.  That's the best hair-brained theory I could muster.   
Sorry that
this happened to you.  It reminds me of my first engine rebuild I did  
when I
was 17 and the engine let go when I was 18.  The stupid oil pump bolt  
had
backed out and I wasn't running an oil pressure gauge.  So I would have
easily been able to fix it in time for just the price of an oil pan  
gasket
but instead I ruined all the bearings.

--Calvin


-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com]On Behalf Of djdawson2 at aol.com
Sent: Saturday, January 17, 2009 11:50 PM
To: forgied at shaw.ca; s-car-list at audifans.com
Subject: Re: [s-cars] Engine completey hosed



  Holy smokes... that guy's is WAY worse than mine.? Mine is a very  
small
"line" between 4 and 5.? I'd like to see his pistons, and I'd like to  
know
why it happened at all.? The headgasket doesn't bother me... it's what
happened to the pistons that makes me scratch my head.

FWIW... it was an all metal headgasket, and I did use ARP studs.

Dave







-----Original Message-----
From: David Forgie <forgied at shaw.ca>
To: s-car-list <s-car-list at audifans.com>
Cc: djdawson2 at aol.com
Sent: Sat, 17 Jan 2009 8:06 pm
Subject: [s-cars] Engine completey hosed










Dave: Sorry for your loss.? Such failures are NOT uncommon, e.g.:


?


http://forums.audiworld.com/s4s6/msgs/253448.phtml


?


The problem could be a metal/paper headgasket (instead of the later all
metal gasket) or


it could be stretched OE head bolts (I sure Hap will chime in on that
note).? High boost


engines probably need an all metal head gasket and ARP head studs and  
nuts.


?


But that is just an opinion.


?


Dave F.





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