Page 104 - JohnEvin_Catalog_Flipbook

Johnson / Evinrude

ENGINE DESIGNS (60° vs. 90°) V4/V6

Johnson / Evinrude outboards were the first to break away from the inline cylinder engine concept. In 1958
they introduced a V4 outboard to the marine industry. This outboard had the cylinder walls configured into
a 90 degree V shape. In 1976 two more cylinders were added and the 90 degree V6 was born. As casting
techniques improved a more compact 60 degree V6 engine was introduced in 1991 followed by the 60
degree V4 in 1995. Other than a narrower profile the difference between an older 90 degree engine and
a newer 60 degree engine is the location of the carburetors/throttle bodies. A 90 degree V4/V6 engine
will have the carburetors/throttle bodies located in the front of the crankcase directly over the crankshaft.
A 60 degree V4/V6 engine will have the carburetors/throttle bodies located on the side of the crankcase,
directly over the transfer ports.

VS.

60° V4/V6 90° V4/V6

GLM’S EXCLUSIVE MARINE PISTONS

• Fully Machined Hypereutectic Pistons
• Featuring a Hard Anodizing Coating on Top
• Resisting Temperatures up to 1560°F
• Hardness: HV280-400
• Pistons are T-6 Heat Treated

OEM CAST vs. FORGED

(99% of OEM Pistons are Cast)

CASTING FORGING
Pros Low expansion rate Greater Strength
Lighter weight
Longer life
Lower costs
Cons Less strength but Heavier weight
compensated by High expansion rate
strong mold process Shorter life
Higher costs
Verdict For Recreational High Performance
For General use Purposes

GLM PISTONS ARE 100% CAST

104