Page 132 - MercMarForc_Catalog_Flipbook

Mercury / Mariner / Force

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

PISTON RING COATINGS COMPARISON

DID YOU KNOW sometimes as much as 30% of engine friction comes from
the piston rings? Therefore, 2-ring pistons have less friction than 3-ring pistons.

To minimize piston ring friction in the engine you should:
• Choose the right ring tension and coating.
• If for oversize, check that the bore size is correct.
• Change the engine oil regulary.

RING COATING SCUFF RESISTANCE WEAR RESISTANCE

Plain Poor Low

Plasma Moly Excellent Good

Nitriding Average Excellent

Chrome Average Excellent

Warning: GLM will not cover the warranty for non-authorized marine engine boring services.

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