OptiMax JP

[jimmyb]

luckily for you, 150, merc still builds 2-strokes, and will continue to in the future.

there is definately a market for both 4 and 2 stroke outboards.

BTW, i am surprised no one chimed in on the BRP 3-star motors having poor fuel consumption...

[150aintenuff]

got shot down to many times.... so im sure others didnt feel like joining the argument

[XSive]

It's tough to argue facts. Right is right and wrong is wrong. I guess nobody wanted to argue with the FACTS as presented by Stinky.

[Scream And Fly]

It's tough to argue facts. Right is right and wrong is wrong. I guess nobody wanted to argue with the FACTS as presented by Stinky.

That pretty much sums it up.

-- Greg

[sho305]

I find it interesting it runs 5800 rpm, thats pretty good for an oil burner...no doubt to do with the injection system.

Seems like they had lots of goofy diesels in the past, like tractors that run on diesel or gas, or start on gas then run on the other. But none of them compare to the DI diesels we have now. I worked at a place with a couple of detroit diesels. They actually had a big flap on the supercharger that you could close to shut it down...I said what is that for? I was told incase the injector pump will not stop. Then they bought a new turbo diesel rig with a pretty small motor, it was soooo much faster. You were lucky to get 55mph with the detroits.

I also read somplace that they have kawasaki diesel motorcross bikes for special forces.

[150aintenuff]

the detroits of the past were slugs but they sounded fast.... just wernt the answer for their usage application. the RPM is more a component of the spark ingnition than the fuel type.. and some diesels of conventional compression ignition are spinning nearly 5 K and produce 600+ hp in the area a BBC will fit and weigh nearly the same as a fully marinized BBC..

[sho305]

I've driven chipped powerstrokes and they move pretty good, but not quite like a built BBC. However, one can afford to drive the hopped up diesel.

[150aintenuff]

yet a PSD only spins a bout 3500 RPM.. the motor i was refering to is a new engine from Styre diesel.. 4800 RPM peak RPM 575-650 HP and cuples to a bravo XR drive

[150aintenuff]

I've driven chipped powerstrokes and they move pretty good, but not quite like a built BBC. However, one can afford to drive the hopped up diesel.

got one myself and even with 8" lift and 39" tires and stock 3.73's it runs better than a stocker and still gets 17 mpg at 65 mph..

[G Rowe]

Interesting thread
Curious, would you notice different performance from the motor when feeding it the different fuels........could this motor run on biodiesel aswell.
JimmyB, if your still watching , its states in emergency you can run diesel or gasoline, is it possible to run it full time on these fuels and if not what problems would most probably arrise - fouled plugs?
Cheers
G

[jimmyb]

in theory biodiesel should be fine... assuming there arent too many "heavy ends" in it (which i dont think there is)

you are correct about the fouled plugs... the current US road diesel has a bunch of "heavy ends" which like to deposit on plug electrodes as unburned hydrocarbon deposits.

for running on gasoline, the biggest issue would be starting. the starting scheme is optimized for JP type fuels, which is completely different starting stratedgy than gasoline. However, we have a few ideas to combat this situation, in case the need arises

[sho305]

We will be into that cleaner diesel pretty soon here right? I wonder if you will be able to buy a diesel car then from more than one manufacturer here (VW, maybe MB too? I really mean one of the big three that been selling diesels abroad for years). Or see more diesels in other things like offroad toys, small lawn equipment, these outboards, maybe even = or < 1/2 ton trucks & suvs. Seems like the big complaint was the dirty burn that the new fuel should not have. I'd much rather have one in a non-sporty vehicle....then again look at Audi kicking everyone in racing lately with a diesel, thats a good one.

[G Rowe]

Cheers jimmy
Any idea what happens to the old navy JP's when they renew them.
From looking at the pricelists on the net there quite alot more pricey than your stock opti. Would i be correct if I said that the only differences between the JP and a 250xs is the loom, ECU, knock sensors and possibly compression ratios.
Very impressive motor, would love to take one for a squirt

[Stinky]

Cheers jimmy
Any idea what happens to the old navy JP's when they renew them. :

They bury them at sea.

Would i be correct if I said that the only differences between the JP and a 250xs is the loom, ECU, knock sensors and possibly compression ratios.

And the piston and ring pack, combustion chamber and a whole lot of engineering time. Hmm, thats everything but the block and crank.

[G Rowe]

Cheers stinky,
its always good to chat with the people in the know
In your eyes if you were looking for a alternative fuel motor for say a fishing boat is this a good reliable option. Its definatly alot lighter than a diesel inboard, I like to fish but I dont like paying for gasoline