Quick question for someone in the know. Are 7a 20v exhaust valves the same as 6a, 9a, kr 16v of the same era? Thanks.
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Yes as far as I'm aware they are all the same.1990 B3 2.0 80 quattro.
1992 C4 2.8 Avant quattro
1994 MTM RS2.
1998 B5 TDI quattro Sport.
2000 B5 TQS. -
As I thought. Thanks Kit.Comment
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I thought the 7A exhaust valves were the first ones to be sodium filled?Last edited by jp_paul; 6 December 2019, 23:11.Comment
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I thought that too....Comment
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Pretty special for normally aspirated.Comment
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Perhaps the better to run 10.3 to 1.Comment
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Don't think 7A ex-valves are sodium filled. Use forum search.
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - ProjectComment
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Here is the factory manual answer to sodium filled or not... There is a disposal procedure because of the potential for fire
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Seems that 7A can have either ones... https://www.s2forum.com/forum/techni...itment-to-s2-s
Audi UrS4 Avant 2.5 20vt - twincharged - Project
Audi 80q B4 Sedan 2.2 20vt - Daily user
BMW 320d Touring e91 M-Sport - Daily user
BMW 740iA e38 - ProjectComment
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it makes you wonder how important it actually is then if some do and some don't and supplies from the factory appear to fit across engine numbers and may or may not actually contain sodium. Its not very scientific is it? 
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They used what ever was in the parts bin by the looks of it!Comment
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