Date: Thu, 14 Oct 2004 19:24:21 GMT From: hohnospamlid.invalid (Goran Larsson) Subject: Re: H engine in 9-5?
In article <2t7si5F1s3mnlU5nospamberlin.de>, Dave Hinz <DaveHinznospamcop.net> wrote: > > A broken piston. > > Ouch. A PCV problem could lead to a broken piston? A broken piston can have several causes. The one involving the crankcase ventilation system is: * The crankcase ventilation system puts in oil in the throttle housing. * Enough oil will lower the octane rating of the petrol. * Low octane rating increases risk for pre-detonation/ping. * If octane rating is low enough then Trionic will not have enough headroom to compensate. * Pre-detonation/ping will damage piston. * Broken piston lets combustion gasses into crankcase. * Crankcase pressure increases. * Hoses connected to crankcase, e.g. part crankcase ventilation system, bursts. I have no idea if this is what has happened to your engine, but it is one explanations that has been put forward as an explanation of piston damage in B2x5 engines. Fortunately I have had no problems of this kind in my own 9-5, so I have no direct knowledge about broken pistons. Look at this image: < http://saab.ath.cx/stcs/presho/Modds/Cool%20Kolvar/Diverse%20SAAB%20T%20kolvar/t7vst5.jpg > <http://saab.ath.cx/stcs/presho/Modds/Cool%20Kolvar/ Diverse%20SAAB%20T%20kolvar/t7vst5.jpg> The piston on the left is from a low friction Trionic 7 engine. The piston on the right is from a Trionic 5 engine. Note the crack on the Trionic 7 piston. The crack starts at top left and continues down and right until it reaches the hole for the piston bolt. This type of crack, unfortunately, is not always visible after removing only the cylinder head. Lets hope the problem with your engine is something less serious. -- G–ran Larsson http://www.nospam.com/saab/
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