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Old 01-18-2013, 09:26 AM
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tim330i tim330i is offline Founder
Location: SF
Join Date: Dec 2001
Posts: 9,360
Mein Auto: Ti Silver 03 M3
Originally Posted by Ronin951 View Post
Are we sure it's 10:1. Here's the difference in the short block description

Short Engine N20B20A 1 11002297079
only in conjunction with

For vehicles with
Low compression engine
S858A=Yes <== what is this?
01 Short Engine N20B20A 1 11002297079
Originally Posted by vitchie View Post
There is defnitely a difference in compression ratio. The 328 is 10:1 and the 320 is 11:1. Thus, the higher compression 320 will knock a lot sooner than the 328, so less tunable. I've also heard that the 320 has thinner drive shafts.
These seem to be in direct contradiction to each other. I seem to remember reading about the 320 in Europe having a 11:1 compression ration but the description of the short block above seems to say otherwise.


Last edited by tim330i; 01-18-2013 at 09:28 AM.
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