Lifted from another forum:
Engine Diffrences:
210 is an AMK Engine code, 225 is BAM.
210bhp/199lbft vs 225ps/208lbft. Both cars remap to practically the same. The 210 is actually 212ps, and the 225(ps) is actually 222bhp.
ECU Code for the 225 has an A on the end.
There were always rumours that the 210 had stronger internals (20mm wrist pins and different rods), but it seems that this rumour stemmed from the early Audi S3 APY engine (also 210bhp) having stronger rods. However, Yumann's engine (AMK) build thread, he kindly measured the gudgeon pins for us, and they are 20mm. The later BAM engine are supposed to have 19mm wrist pins.
From ETOS and ETKA the block and piston set for AMK :06A 103 101 J and for the BAM : 06A 103 101 J, conrod for AMK : 027 198 401 B, conrod for BAM : 027 198 401 B. So if they are different, nobody told SEAT Parts.
Both engines have VVT, but this is apparently for emissions rather than a VTEC style torque/power shift. Although most cars definitely pull again at about 4,000 rpm). Originally we thought the VVT actuation was different (one mechanical the other hydraulic) but we now understand them to be the same. Again, it is the APY (early 210 S3 engine, never fitted to the LCR) that has mechanical VVT actuation and possibly where the rumour started. Both AMK and BAM have Electro-hydraulic VVT actuation.
The turbo (K04-23 from Borg-Warner), manifold & exhaust are all the same.
