View Full Version : motor differences

02-20-2004, 08:29 PM
what are the differences between the m20/b25 and a normal m20? i was looking at an engine here at the junk yard and it is not from the us. just wondering if there is a way to tell externally. any help would be great. *wiggle*

02-20-2004, 08:47 PM
I don't really know but is it possible that the b25 may stand for Alpina b25

02-20-2004, 10:43 PM
Motor Code : M20
displacement litres : 2.5
Motor VDS Code : M20/B25
Engine Overview : M20 - 2.5L SOHC-12v/L6 + eta - M1.1

There are more engine codes etc at:


02-20-2004, 11:22 PM
thanks ya'll, but the motor they have is from an m6. i just called and asked them if they have any 6 cyl. bmw motors and they said yes and i assumed that it was an m20. they only want $150 for it, does anyone know the specs on this thing, they didn't know the year. would this be a viable swap for more power. i already am saving for a 3.1 stroker and turbo. should be good for 325hp, would i be able to soop this m6 motor up more than that? what is an m6, 3.5L?

02-21-2004, 01:28 AM
if i remimber correctly the m6 motor is a 3.8L motor. If that motor is the M30B38 then it may be possibly to turbo charge it. One catch I don't think the company that made the turbo, Dinan, still produces them. Without a turbo charger that motor should produces enough power to make you want posi traction if you don't already have it. Like 185-300hp more or less.

I've heard a few bad things about the m6 motor but for $150 it may be a deal it may be a nightmare. A m10 for my car is like $200-600. Lastly that motor is a bit heavy and will throw off the balance of your car, but this must be a good swap since its copied in many off shore countries.

Yall correct me if I'm wrong...

02-21-2004, 02:50 AM
M50/B25 M50 - 2.5L DOHC-24v/L6 - M3.1

M50TU = same with VANOS.