Mercury 98ci Specs: 3.071 x 3.291 in

Mercury 98ci specs: 3.071 x 3.291 in (78 x 83.6 mm) bore and stroke, shared by all 2 versions. Displacement, compression and factory ratings, plus rod ratio.

At a glance

Displacement	98 ci
Cylinders	4
Bore	3.071"
Stroke	3.291"
Compression	7.9–9.4:1
Advertised power	100–132 hp
Years	1991–1994

Engines in this family

Engine	Displacement	Bore × Stroke	CR	HP
B6	98 ci	3.0709" × 3.2913"	9.4:1	100
B6T	98 ci	3.0709" × 3.2913"	7.9:1	132

Factory cars with a Mercury 98ci

• Mercury Capri: 1991, B6, 100 hp; 1991, B6T, 132 hp; 1992, B6, 100 hp; 1992, B6T, 132 hp; 1993, B6, 100 hp; 1993, B6T, 132 hp; 1994, B6, 100 hp; 1994, B6T, 132 hp

What varies across the family

Compression spans 7.9:1 to 9.4:1, so fuel requirements differ meaningfully between members — worth checking before assuming parts interchange.

All are undersquare — stroke larger than bore, favouring torque low in the range.

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 Mercury engines