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After replacing my friend Todd Girvin's engine in his 1993 Eagle Talon TSI due to poor dealer work (www page in development) I had the opportunity to thoroughly examine his dead engine and compare it in detail to my spare 1990 turbo parts engine. This page describes the differences that I found between the two. Hopefully someone will find this useful when swapping engines from different years or just upgrading individual components.

Keep in mind that I've only had access to a 1990 (serial #HW8597) and a 1993 (serial #NN5387) engine. If your serial numbers are close to these then your engine is probably similar, but not necessarily so. There may be (and probably are) a host of other modifications that were made that are not on the list. The split between engine models seems to be at serial #NH0001. Any lower number and it is the older engine model. Any higher number and the engine is the newer model. The dealer's parts books reflect this also. If anyone can get a parts book from them I want it!
If anyone has additional details about the 4G63 engine I would like to hear from you! I want to further develop this page into a complete parts compatibility and interchangeability guide.

Thanks to everyone who has already contributed to this page!
Interesting Facts = Contrary to popular belief, this engine did not appear first in 1990! I've hear rumors that it may have been fitted in some form to early Australian 1984 Starions. "  Says Tim Hoffman

And he is right!!

Following is the story of the SIRIUS 4G63BT as fitted to Australian, and some English and Japanese Starions. This motor was also fitted to the Cordia in 1.8 Litre form also.