Metric Mechanic m42 engine series e30 Magazines/Books/Booklets...

[Peter]

Introduction



Often the 4 Cylinder BMWs

are overshadowed by their 6

Cylinder cousins of the same

model. For example, the 1990

318is can get over-looked in

favor of the 325i or M3. The

same goes for the 318ti and

1.9 liter Z3. But at Metric

Mechanic, we look at the 4

Cylinders as junior models of

the M cars. The E30 318i uses

lighter scaled down drive train

components than the E30 M3.

The E36 318ti & Z3 continue

this theme through smaller

more compact bodies. All the

4 cylinder car models have

lightweight bodies with lightweight engines, transmissions

and differentials. Weight is not

only the enemy of acceleration

but also handling and braking.

The M42 and M44 DOHC

(double overhead cam) engines used in these models

have excellent power potential. Currently, our 2100

Rally Engine is good for just over 200 HP and can

rip through the 1/4 miles in 14.5 sec. at 98 mph in

an E30 318is. FAST for a 4 banger!

The power note (the sound the engine makes

when it approaches peak cylinder filling) comes on

at 4300 rpms and the engine generates very strong

pull to its 7700 rpm redline. Even below 4300 the

engine has a decent amount of torque which makes

it a great daily driver capable of 30 mpg in highway

use. Now for a closer look at the new MM “Baby

M3 Killer Engine”.