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re: 7 Marine engines
Posted on 4/14/16 at 12:47 pm to Barf
Posted on 4/14/16 at 12:47 pm to Barf
Problem is that once you get to these 40 foot plus center consoles they are weighing in close to 20k lbs or more and take monster horsepower to move. You would need quad 300s which is more complicated and more prone to problems and uses more fuel than a twin 557/627 engine setup. Not to mention the 557 weighs less than two 250-300's. Plus twin skegs in the water is less drag than 4 so top speeds of the high horsepower twin will be greater than the quad. That said builders are going even larger and strapping quad 7's 
1
Posted on 4/14/16 at 1:15 pm to bayoudude
quote:
You would need quad 300s which is more complicated and more prone to problems and uses more fuel than a twin 557/627 engine setup.
This is debatable. Adding outboards doesn't necessarily compound problems. Plus they Yamaha 300 is a proven platform with dealer support vs the 7 marine that has been around for only a few years.
I would like to see real work fuel burn numbers. Four stroke gas engines seldom produce more than 10 or so hp per gallon per hour. That potentially puts the burn rate on twin 557's could north of 100 gallons an hour. Best case 90 gph.
This post was edited on 4/14/16 at 1:17 pm
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