danpug 1 Posted December 3, 2007 Does anybody know what compression these engines run as standard? I can't seem to find anything much on the net about them. Thanks. Share this post Link to post Share on other sites
Anthony 1,000 Posted December 3, 2007 They're around 9.6:1 IIRC (I can check for you when I get home), but internally they have flat-top pistons and the chamber size in the head is larger than normal GTi heads. So if you put a SRi head on a GTi bottom end you'll get a low compression engine, and if you put a GTi head on an SRi bottom end, you'd get a very high compression engine. Share this post Link to post Share on other sites
danpug 1 Posted December 3, 2007 Excellent, any idea what compression would result putting an sri head on a gti (1.9) bottom end? Share this post Link to post Share on other sites
danpug 1 Posted December 3, 2007 For the benefit of future searches it'll be about 8.5:1 Share this post Link to post Share on other sites
KRISKARRERA 2 1 Cars Posted December 3, 2007 A 1991 405 SRi XU9J2/K - the engine with the MP3.1 ecu - is 9.3 to 1. Share this post Link to post Share on other sites
ORB 227 1 Cars Posted December 3, 2007 I have a set of pistons, con rods a crank and a cam from a 405 SRi if anyone is interested? Share this post Link to post Share on other sites
