what is the difference

[maniax101887]

Im just getting into bmws and i have a regular 87 325. i was wondering what is the difference between the 325 and the 325i/is/ix are they dohc why do they rev higher than the 325s. if anyone can tell me the difference i would really appreciate it

[MrK]

Well to start off with, there's no such thing as a regular 325 AFAIK. There's 325e, 325es, 325i, 325is, and 325ix. No six-cylinder e30 comes 'dohc' from the factory. The e and es are 'eta' motors that are built more for economy and low-end torque, and due to their light valve springs, can't rev very high. the 'i' variants are the sportier cars that have slightly less torque but much higher horsepower and rev limits.

Hope that cleared things up a bit.

[Scott314]

Well to start off with, there's no such thing as a regular 325 AFAIK. There's 325e, 325es, 325i, 325is, and 325ix. No six-cylinder e30 comes 'dohc' from the factory. The e and es are 'eta' motors that are built more for economy and low-end torque, and due to their light valve springs, can't rev very high. the 'i' variants are the sportier cars that have slightly less torque but much higher horsepower and rev limits.

Hope that cleared things up a bit.

Some stripped down etas were badged just "325". My 89i only has a "325" badge, and no indication of an "i" being removed from it. 325i's have dual valve springs, a hotter cam (sohc), bigger throttle body, different intake manifold design, and dual exhaust, and make about 50hp more than etas. Etas have slightly more torque at a lower RPM. i's redline at 6400, and etas redline at (I believe) 4700.

[MrK]

My 325i has no badge at all, and no sign of there ever being one. But it's still a 325i :)

Just messin'

Cheers

[DoriftuEvo]

From '84 to '88 there existed the 325. I owned an '87 325. They had the eta engine. There is no 325s, but rather the 325is and the differences in models are discussed in threads that can be found in the FAQ and DIY section and on numerous other websites.

http://www.r3vlimited.com/Tech/models.htm

http://www.unofficialbmw.com/ftp/bmw/FAQ.15

[maniax101887]

thanks that clears up alot. but dont the 318is come dohc

[SpecM]

thanks that clears up alot. but dont the 318is come dohc

-The late ones did (90-91)
-Early 318's (83-85) were sohc m10's

[StereoInstaller1]

No six-cylinder e30 comes 'dohc' from the factory.

Hope that cleared things up a bit.