[s-cars] S6 pinging woes - the continuation

[djdawson2 at aol.com]

 I believe that 30 minutes with a cheapo compression gauge is going to give the answer... call it pre-ignition or detonation.

There are many documented cases of headgasket failure between 2 adjacent cylinders.? The headgasket fails, then it burns a little groove in the cylinder head between those 2 cylinders... allowing flame travel... BTDT.

The one I experienced was between 4 and 5.? 5 was being pre-ignited.? The result was an engine that sounded like it was "pinging" under any and all conditions, even idle.

Letting this go for too long will result in total failure of a piston.

I would urge you to do a compression test before doing anything else.

Dave


 


 

-----Original Message-----
From: Taka Mizutani <t44tqtro at gmail.com>
To: s-car-list at audifans.com
Sent: Tue, Jul 28, 2009 10:50 am
Subject: Re: [s-cars] S6 pinging woes - the continuation










You've just contradicted yourself, Brett- if the fuel/air charge ignites
prematurely, you get a large increase in cylinder pressure, which causes all
sorts of bad things to happen to the engine.

You've stated this below as well as stating that it doesn't.

Anyway, the bottom line is that it's bad, the OP may have damaged his/her
engine and it should be checked out. Having that happen with all of the high
boost mods taken out is a bad sign.

I'd also check the fuel system to make sure that you're getting the proper
amount of fuel actually delivered- if the pump or FPR or injectors are not
doing their jobs, the computer might think it's sending enough fuel when
it's not.

Taka


On Tue, Jul 28, 2009 at 11:48 AM, Brett Dikeman <brett.dikeman at gmail.com>wrote:

>
> Pre-ignition does not increase cylinder pressures and temperatures
> much beyond normal values (I think).  Pre-ignition is bad because it
> puts more force on the engine internals, and in ways it wasn't
> designed...for example, if power is developed at exactly TDC, all the
> force goes against the rod, crank, bearings, and head gasket/bolts,
> instead of applying torque on the crank.  Detonation does increase
> pressure and temperature, massively- it melts and bends things.
>
> Cody's recommendation to drain/filter the oil and check the engine oil
> filter are sound.
>
> Brett
>
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