Re: Viggen MY 99-2002 - Comparison - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: Viggen MY 99-2002 - Comparison
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Posted by Viggen Aero [Email] (#977) [Profile/Gallery] (more from Viggen Aero) on Sat, 29 Aug 2009 06:22:13 Share Post by Email
In Reply to: Re: Viggen MY 99-2002 - Comparison, RKM, Sun, 23 Aug 2009 15:47:30
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Hi, I guess I had it mixed up. Here is a quote from the viggenfactfile.com which is a great site for Viggen info

so are the B235R pistons really "weak"?
I already promised to talk about my specific engine problem. I had a 1999 B235R in my Viggen. This was the first MY for the B235R, and therefore not quite free of flaws. While the pistons where in fact more solid than the MY2000 pistons, whose piston rings where mounted "too high" for emission reasons, it was to soft cylinder walls that were the problem. What happened to my engine was quite similar to what can happen with forged pistons: The pistons, when very hot, milled out the cylinder walls (stock pistons in the b235r are coated and quite hard, too), therefore causing too much piston tolerance -> oil consumption.
Solution:
-Change oil often.
-Try to keep egt low. How? Good IC, not too much boost. If you are a true Trionic genius, you can get much power on less boost.

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