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Tigger937 · Posted: Sun Aug 26, 2007 12:20 pm Post subject: Short Block Differences

Can someone confirm for me the differences in short blocks between the 924, 931, series I & II.
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1981 931 (Concours)
1982 931 (Daily Driver)

"Think outside the box"

Smoothie · Posted: Sun Aug 26, 2007 4:55 pm Post subject:

924 - pistons- "cast light alloy", compression- RoW'78-'85 9.3:1, US'78-'79 8.5:1, US'80-'82 9.0:1

931 - pistons- forged, compression- both RoW & US '79-'80 (S1) 7.5:1, RoW '81-'82 and Italy thru '84 (S2) 8.5:1, US '81-'82 (S2) 8.0:1
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"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox

Tigger937 · Posted: Mon Aug 27, 2007 9:37 am Post subject:

Thanks for that.

So the crank, rods and block are all the same, only the bearings, piston pins, pistons and rings are different?
_________________
1981 931 (Concours)
1982 931 (Daily Driver)

"Think outside the box"

Smoothie · Posted: Mon Aug 27, 2007 9:48 am Post subject:

Actually, I believe the bearings are the same also. Everything else from the rods on out is the same. (All 924NA-931 got forged rods according to the little booklet here.)
_________________
"..it's made in Germany. You know the Germans always make good stuff."

'82 924T, US version, dark green metallic, 5 speed Audi 016G gearbox