pictsidhe
Well-Known Member
I've been looking into the possibility of using an outboard power head. I initially assumed that I needed a 4 stroke to get good economy.
I kept seeing hype about the newer dfi 2 strokes being good. Well, dfi means you don't lose a load of fuel out the exhaust, should be good, but how good?
Numbers were hard to find, I eventually found the following paper. Skip to page 46
http://publications.lib.chalmers.se/records/fulltext/149154.pdf
Day-um! 280g/kWh is 0.46 lb/hphr in old money, that's right in the cruise sweet spot. That's after gearbox losses too.
The bad is that is still fairly new tech, so you'll need to pay for it. It should spread, though. I have a 41cc chainsaw that uses stratified charge thanks to the EPA and much less fuel than I'm used to.
The evinrude injectors retail for about 400 and do all the high pressure stuff, everything else is current tech.
All hail the EPA for kicking industry into modern technology!
I kept seeing hype about the newer dfi 2 strokes being good. Well, dfi means you don't lose a load of fuel out the exhaust, should be good, but how good?
Numbers were hard to find, I eventually found the following paper. Skip to page 46
http://publications.lib.chalmers.se/records/fulltext/149154.pdf
Day-um! 280g/kWh is 0.46 lb/hphr in old money, that's right in the cruise sweet spot. That's after gearbox losses too.
The bad is that is still fairly new tech, so you'll need to pay for it. It should spread, though. I have a 41cc chainsaw that uses stratified charge thanks to the EPA and much less fuel than I'm used to.
The evinrude injectors retail for about 400 and do all the high pressure stuff, everything else is current tech.
All hail the EPA for kicking industry into modern technology!
