Yamaha four strokes with no cam shafts?

[boscoe99]

I like the thought of it. No shafts, no drive belts, no cam position sensors, smaller cylinder heads, less weight, better performance, greater efficiency, etc.

What do you think? Couple it a boat mounted fuel pump (no VST and related crap), belt drive alternator and you would have a real "**** changer" as they say.

FreeValve Technology | FreeValve

[pstephens46]

I like it. The VST wouldn't be such an issue if it could be designed for easier access. Getting rid of all the various fuel pumps would be a huge plus...

[rodbolt17]

you tell me how Yamaha is going to place the HP pump in the tank?
I know I know master craft does.
master craft also owns the hull through the pleasure craft marine group.
now add two 24 or 48X crank position sensors and catalytic converters and we have a 65,000 dollar outboard.
if Yamaha has to manufacture a 33ft offshore hull to mount it you now have a 600,000 dollar center console fishing rig.
Yamaha goes bankrupt.
the cost of hulls and motors is getting stupid.
we see less and less of young family boaters simply cause a new tiller electric start 30hp with T&T is about 4300 dollars.
a new 4.2 300 offshore repower on your hull is an easy 24,000 dollars.

this stuff does not last forever and it does require maint to the tune of 1000 or so a year for a single v6/v8.
typical 200 hr service on a 4.2, water pump kit,65 dollars and about 1.5 hr.
two T ststs at about 45 each and about 1-1.5 hr.
oil change,filter about 12 bucks oil at about 8 bucks per qt x7qts.
labor about 30-45 min depending on how much spills from that poorly designed filter location.
a water separator at about 20,engine filters,all over the map but at least 60 bucks worth, VST cleaning another set of filters and about 2 hrs.
that was for one summer of fun not including slip fees,cold beverages and fuel.

or you can dog it till something breaks whine that now it is gonna be expensive and quit boating.

[boscoe99]

you tell me how Yamaha is going to place the HP pump in the tank?

The pump is provided by Yamaha with the necessary harness. The pump gets installed in the boat. The harness connects the pump to the motor.

Similar to what Yamaha did for a bunch of two strokes. Oil tank in the boat. Harness to connect the motor to the tank pump.

Instead of pumping oil to the motor the pump will pump gasoline. No lift pump(s). No VST and related pump and all of the other hoses and crap. Cooler cleaner gasoline being provided to the motor. Motors like clean and cool fuel. Only thing on the motor is a EFI fuel rail(s) with a pressure regulator. Oh, and a return line to send unneeded gasoline back to the tank. For continuous filtration.

I can dream can't I?

[rodbolt17]

goes back to when that motor was crated no one at Yamaha knows what hull it is going on,new or repower.
to modify the hull fuel system to accept an in tank fuel pump and USCG approved plumbing would add another 7-10 thousand dollars on most hulls.
more if twni or triple or quad tanks(Carolina classic ) are used.
if you buy a master craft it was ALL designed and built for a single purpose and it is all con*****ed.
however if you don't wake board or water ski a master craft is about a useless hard to service boat.
the 36 regulator I just finished has twin 300 gallon tanks and they would require deck and partial cabin removal to access the tanks.
now toss in the venting requirements for hulls made after jan 01 2010 and you have a nightmare of epic proportions.

[pstephens46]

Fuel tank venting requirements.....I wonder if these requirements are the reason some of these boats are difficult to fuel? I have seen these guys overflowing fuel as the tank tries to burp during filling. The seems to defeat the purpose of reducing emissions.

[rodbolt17]

all fuel systems since jan 01 2010 must not allow vapors to enter the atmosphere.
that is why EPA portable tanks swell up like a football and we now have pressure regulators in the fuel line on portable tanks.

built in tanks now have charcoal accumulator tanks and such almost like cars did back in the 70's and 80's.

it is also why I have to write a letter to Volvo stating why I cannot use a catalyst engine as a repower.
however that will soon be over as that is all that will be avalible.