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Re: Viggen Piston Failure
Posted by ed smith (more from ed smith) on Tue, 1 Jun 2004 07:58:26
In Reply to: Viggen Piston Failure, Jamie, Mon, 31 May 2004 11:37:48
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Over the past several years I have experienced some piston related engine failures, the most recent at Road Atlanta 3 weeks ago. JE placed the top ring too close to the top of the piston, and I lost #3 and #4. Each time this happens, we assess the possible causes and make the appropriate change. In looking at the Viggen piston failures, this comes to mind:
in order to make the Viggen very driveable, Saab has given us an extremely high compression ratio for a turboed engine. Even a minor burp in the ECU could lead to a lot of bad things, as spark control, etc. is so critical in this engine. As this apparently has not been a problem with the 9000 engines, there must have been a piston design change from the 9000 to the Viggen, an area of possible trouble. Also, plain ol' metal fatigue, combined with a few tanks of bad gas could also result in what you have just seen. Sorry to read about it. -ed
posted by 68.47.190...
Posts in this Thread:
- Viggen Piston Failure, Jamie, Mon, 31 May 2004 11:37:48
- I just talked to my mechanic, GM, Tue, 1 Jun 2004 11:17:52
- Re: I just talked to my mechanic, jp, Wed, 2 Jun 2004 08:10:16
- Yes, I like your mechanic, davenew, Tue, 1 Jun 2004 13:22:58
- I change mine with every oil change, ckpaden, Tue, 1 Jun 2004 13:21:19
- I'm thinking the Viggen is not a long-term keeper, jc, Tue, 1 Jun 2004 08:18:52
- Re: Viggen Piston Failure, ed smith, Tue, 1 Jun 2004 07:58:26 <-- Viewing This Message
- we already know, davenew, Mon, 31 May 2004 18:49:01
- I feel your pain & frustration ..., Pierre, Mon, 31 May 2004 14:02:44
- sustained high speeds over 100mph? n/m, Tim, Mon, 31 May 2004 12:48:15
- Was your car modified in any way from stock? n/m, 85SLED, Mon, 31 May 2004 12:19:09
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