timing belt

[m3f_deilenberg_6310b1785a]

I know some use belts. I am saying before they used chains all they used was belts.



Wow - you are just so wrong on this. The only BMW engine that used belt-drive camshafts was the 2.5l and 2.8l ones used on the early 80's 3 series and the 528e 5-series. It was BMW's experiment with belt-drive camshafts.



After a lot of people trashed engines by not changing the belt every 60k miles, they introduced the M5x series engines - which have used chain drive for the cames since day 1. The "big" 6 - 3.2-3.5L also used chain, as have all the V8 engines.

[m3f_badgtho_2cb87af10e]

Wow - you are just so wrong on this. The only BMW engine that used belt-drive camshafts was the 2.5l and 2.8l ones used on the early 80's 3 series and the 528e 5-series. It was BMW's experiment with belt-drive camshafts.



After a lot of people trashed engines by not changing the belt every 60k miles, they introduced the M5x series engines - which have used chain drive for the cames since day 1. The "big" 6 - 3.2-3.5L also used chain, as have all the V8 engines.



Belts have less friction, when gas mileage was a concern as in the 2.7litre they tried it. My 86 325e has a belt, what a pain that was. But most audis still have em, after all they are just VWs

[m3f_M3 Brasil_9d884090ba]

before they came up with using a chain they used belts.



Some Audi´s still using them ...