Page 82 - Yamaha_Catalog_Flipbook
P. 82
Yamaha
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.
82
