View Full Version : 2.5 litre 6 cylinders what one to buy?

05-31-2002, 01:14 AM
Is the twin cam 2.5 from a 91 525 a good engine or is a newer vanos 2.5 a better engine to build performance?

05-31-2002, 07:52 AM
i remember having this conversation at the meet with you,, id get the vanos one,, just because its slightly newer and has vanos (of course),, but remember that you will have to change you suspension to compensate for the extra weight in the front,,,,,,,,
,,,,,,,,,,,,,,,,,,,,good luck mark

05-31-2002, 08:48 AM

It all depends on what you plan on doing to the motor in the future. If you plan on keeping it relatively stock, than a newer VANOS powerplant is better. If you plan on getting good power from it (cam it, forced induction, etc..) then the motor you inquire about is by far the best one.... infact it's the motor so many serious tuners look for. The '91/'92 M50 had a thicker block (to be bored and stroked to 2.9L) and was able to handle more boost. The lack of VANOS also meant you could run a much more radical cam. Example?... Do you know Breyton's wide body silver E46 4-door? They dumped like $120,000 into it (their own "showcase" prototype car) and managed to get 528HP out of the motor..... it is a stroked/bored '92 M50 non-VANOS lump with internals and a intercooled/Vortech blower pushing 14psi.
If you get it out of a 5 series... bonus! you won't need to hunt around for an E34 oil pan.

05-31-2002, 11:19 AM
Thanks Randy that's music to my ears!

by the way what about my Differential Gearing. Korman say the 525 has a 3.23 in the back.. well if i keep my 4.10 that's gonna be pretty wild! i'm not really concerned with top speed 200 is fast enough for me but i don't wanna be driving at 4000 rmp on the highway just to keep up with mini vans.


05-31-2002, 11:24 AM
Mark ..no need to change the springs.. with the M50 block in there my car will sit like the muscle car it will be :D :D :D

just joking.. i'll have to find the right weight of spring to use.. should be interesting and very complicated