For a 4 cylinder, the formula for displacement is: Bore x bore x 3.14 x stroke x # of cylinders (4) Divided by 4 x 1000 You'll see that if you stick a 5 in for # of cylinders this is the formula for Audi 5-cyl motors also. Tom -- Email LIST problems to: scirocco-l-probs@scirocco.org. To unsubscibe send "unsubscribe scirocco-l" in the message to majordomo@scirocco.org