Mercedes-Benz 234ci Specs: 88 x 78.9 mm

Mercedes-Benz 234ci specs: 88 x 78.9 mm (3.4646 x 3.1063 in) bore and stroke. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	234 ci
Cylinders	8
Bore	3.465"
Stroke	3.106"
Compression	8.3:1
Years	1981–1985

This engine

Engine	Displacement	Bore × Stroke	CR	HP
M116 3.8 (3839 cc)	234 ci	3.4646" × 3.1063" *	8.3:1	—

Factory cars with a Mercedes-Benz 234ci

• Mercedes-Benz S-Class: 1981, M116 3.8 (3839 cc); 1984, M116 3.8 (3839 cc); 1985, M116 3.8 (3839 cc)
• Mercedes-Benz SL: 1981, M116 3.8 (3839 cc); 1982, M116 3.8 (3839 cc); 1983, M116 3.8 (3839 cc); 1984, M116 3.8 (3839 cc); 1985, M116 3.8 (3839 cc)

What varies across the family

This family is represented by a single engine in the database: 234 ci, 8 cylinders, a 3.4646" × 3.1063" bore and stroke.

All are oversquare — bore larger than stroke, which favours revs over low-end torque.

Each engine page carries rod ratio, mean piston speed, bore/stroke character and cylinder head specs where published, and links into the calculators with its dimensions already filled in.

← All Mercedes-Benz engines