Originally Posted by Sonar
It will not be too long before there is NO choice.
It will be a 4 stroke and that,s that..
Unless your a commercial user...
Before the fanboys jump on that.......
The etec g2 is probably the cleanest outboard in the market period due to advances in DI. Exact figures are on the epa site if you want to go trawling.
Once the 4 strokes go DI instead of EFI they will obvioulsy pi$$ all over the etecs with emmisions and probably better fuel economy again, but probably with a weight penalty as needs higher fuel pressure pumps than the current port efi injection.
The G2 is probably the most fuel efficient outboard available due to the advances with DI, whether the injectors and pumps last we will need to wait and see. Injectors don't like crap fuel or water, DI is even more sensitive as it lives in the combustion chamber where it is a wee bit hot, so costs go up for them. Efi injectors live in a much cooler environment so not as complex units.
Keep in mind, there are no real modern 4 strokes in terms of fuelling, only Suzuki have done much with lean burn in last few years. To date no one has went as far as etec with DI (the optimax doesn't have mercury injection tech BTW, it is licenced)
There are a few reasons for them not REALLY concentrating on fuel efficiency-
1. Weight has always been an issue, fix that first so money spent there.
2. Efi engines easily meet emmision standards set out by regulating authorities so why waste money chasing more. Spend the money on improving weight and torque first.
It is good evinrude have moved the industry on IMO but the reality was they had to do it to keep making engines past the 2018 epa regulations and foreseeable beyond. As mercury don't own their DI tech I assume they will ditch their 2 strokes after 2018 rather than attempt to compete with evinrude when they have a solid 4 stroke line up.
If I had to predict the future, big Outboards over say 150hp will eventually be force induced and smaller blocks used. Currently 4 strokes are using bigger blocks to get torque up, i don't see that continuing as cars are going the opposite way and therefore Outboards need bespoke blocks ££££££. Probably bad economics long term that so I'm curious to see where it goes.
I have said before I will never buy a 2 stroke, but it is only because of the constant rumours of banning them on loch Lomond. It has been happening for years that rumour and nothing seems to come from it.....but the day I hang an etec they will pass it!
There are arguments boats with 2 strokes are harder to sell. There may be some truth in that but it is highly subjective at best. As long as it isn't a ficht I would sleep easy
However, buy what suits your needs and get out boating, 2 or 4 stroke.