Beat me to it.
Beat me to it.
http://locostusa.com/forums/viewtopic.php?f=4&t=6062&hilit=boat&start=0
I still can't find the forum thread that had pictures of an outboard stripped down for some reason...
EDIT: got it: http://www.locostusa.com/forums/viewtopic.php?f=35&t=6102&start=0
friedgreencorrado wrote: integraguy & BoostedBrandon nailed it. Marine motors are designed to run at constant throttle settings for extended periods of time (trust an old beach kid on this one?), and you'd spend an eternity crafting an intake & fuel delivery system to give them any kind of throttle response at all.
300 HP from 3400 cc's of two stroke is going to be so mild and detuned, it will make tons of low end torque and power throughout the rev range, and be plenty responsive. It just wont want to rev too high
FlightService wrote: Before they were killed, the V4 500cc two stroke Moto GP bikes were well over 200hp and within the rules. The new 990cc V5 four strokes are in the mid 250 range, and are dialed back to keep from destroying the tires. Once again DIALED BACK and within the rules. I personally would start with a 2liter Merc and do the conversion. #1 they are cheaper #2 you can find them #3 easy to work on. #4 8K rpm is very possible (just run ARP rod bolts if you want them to last and beefier rods) These engines do pull a neat trick at ~220hp. People lean out the center cylinder too much, stick the piston, snap a rod, and then the rod proceeds to cut the power-head in half. Neat thing.
what model would that Mercury engine be?
z31maniac wrote:FlightService wrote:Even fresh water marine engines are now converting to closed-cooled systems, from open-cooled systems. And this was the case 3 years ago when I was at MerCruiser righting instruction sheets on how to do the change.mad_machine wrote:UHH, no. Raw water from lower unit up to engine and exit with exhaust through the prop hub. For the ops outboards. Salt water Inboards get the system you describe, otherwise is is a fresh water direct system.Duke wrote: Cooling would be an issue, since Evinrudes usually have the coolant capacity of, ohhhh, *a large navigable body of water* to work with.probably not an issue.. the issues with marine engines is keeping them up to running temperatures... as it is rare to get 210 degree bodies of water.. so they generally either have a heavy restrictor or a water to coolant intercooler
Bayliners on the lot I saw 3 weeks ago were open loop.
BURN!!!!
I know it is an option, but still open loop is the norm in fresh water. Closed loop is smarter, but more expensive. As you know in marine, $300 on the line is worth $5k at the dealer.
If you want I can send you pics from the Ft Lauderdale and Miami boat shows this season to prove it. I can't guarantee what will be in focus... 
Bayliners are low end boats...
Forgive the hijack, but anyone know anything about the Mercury 275 3.4L Cosworth 2 stroke boat motor? They're common and cheap, and 275hp out of the box. Been thinking it'd be a ton of fun in an X1/9.
mad_machine wrote: Bayliners are low end boats...
and they are owned by the same company that owns Mercruiser and built in the same plant as SeaRay in Tennessee (Bruinswick factory depending on model)
Just saying.
I don't know much about the 3.4. just the 2 and 2.5L. Most are very similar with the same issue.
It has been said before, look at snowmobile motors.
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