Quote:
Originally Posted by BiloxiGuy  How did they shave an additional 50lbs off of the VMAX SHO versus the new already light Offshore series? |
Using light weight metals and a new piston sleeve that is not steel but a new coating that they say is harder then steel.
I saw pictures of their pistons and they look pretty delicate. Not sure if I am convinced that they will be reliable.
Here is a link to the new engines with information on them.
http://www.boattest.com/Resources/vi...px?NewsID=3887
They are using a sleeveless design.
***The new powerhead uses plasma-fused sleeveless cylinders instead of steel sleeves to provide a durable surface for the piston rings. Not only does the process reduce the overall amount of powerhead weight, the resulting material – which measures about 0.1 mm thick --- takes up less space in the engine block than a conventional steel sleeve, says Yamaha. This design leaves more room for the pistons themselves, allowing that displacement to be optimized creating the new 4.2-liter engine.***
I forgot they use a new lighter composite engine cover also.
