Don't know if anyone can help, but worth a try.
Ages ago, someone posted a link to a webpage that contained engine codes for every Cosworth engine ever made.
Has anyone got the link?

 

Bernie,

If you mean YB engines, then this is the information I have:

YBB - October 85 to July 89....18,990 produced (5,60 3dr and 13,390 4 door -250 excess to build requirements)

YBD - May to August 87......525 produced (RS500)

YBG - October 89 to November 91.......12,515 produced

YBJ - dates as YBG Euro 1504 emission standards (green cam cover)

YBT - March 92 to Feburary 94......5,186 produced (Escort Big Turbo)

Total units built (up to 1994) 36,691 (add 525 RS500 type for a total of 37,216)

My book (The Cosworth Fords - Jeremy Walton) was published
in 1994....so no further information. From then onwards
they produced the YBP (small turbo Es Cos) engine.

 

I think you mean this one....

http://www.race-cars.com/utility/coswrthr.htm

 

Or from the horses mouth....

http://www.cosworth-technology.co.uk...1_history3.htm
http://www.cosworth-technology.co.uk...1_history4.htm

 

That's the one!
Thanks a lot

 

on the ford sierra cosworth sapphire's VIN plate there is listed that the 'Engine Motor' is LS instead of N5. Does this mean that the Sierra is not an original RS Cosworth?

 

Think that's the code for a 1600cc, looks like you have a replica

 

As Martin says, that's not a 2.0 engine