2 Cycle is King over 4 Stroke by my comparison formula.

[LakeFever]

The only way to get a four stroke into a comparable power to weight zone as a two stroke is with smaller displacement and boost. This brings on the challenge of fuelling but both of these hurdles can be jumped. Four strokes will always have a substantial performance advantage with boost vs two strokes with boost because there is an entire stroke to load the boosted column where a two stroke only has a partial cyl volume to fill. Something like Mercs 115xs with a 14lb 1.5x volume boost system would be light enough and have 300hp potential.

i dont see merc building that for us for two reasons: why compete with themselves they have 300hp and second the cost would be pretty dang high. But that would surely be a mota id want

[David - WI]

It would take a turbocharged four-stroke to compete with a modern normally-aspirated two-stroke of equal displacement, but even then, only if weight & cost weren't issues.

3.2L V6 Opti makes 300hp, with variable exhaust valves 375hp.
4.2L V8 Opti would make 400hp (vs 4.6L 300R V8), 500hp with variable exhaust valves.
5.3L V10 Opti would make 500hp (vs 5.7L 400R V10)
5.3L V10 Opti with.variable exhaust valves would make 625hp (vs 5.7L supercharged 450R V10)
6.4L V12 Opti with variable exhaust valves and the two-speed transmission would make 850hp (vs 7.6L V12 600 Verado)

[FMP]

Damn. Serious? I hope that’s a joke. Because even some kind of small cat would be hideous.

Crap. It looks like you weren’t joking.

-Peter

It's the elephant in room, any 4s I've been behind that's running hard or just cruising stinks. However lean and clean they claim as someone previously posted they can't find the emissions reports from the manufacturer.
The guys that lost their 2s outboard development at BBD, were they out of ideas, only the new 4s converts know. Are other's still looking forward, yes with emissions on the front page.

[John S]

Post up last year's hour meter/ top speed. Add up the averages, and we'll decide who's king. Even though, we all know Jeff "Louie" Clienmark is "Tha Kang"!

[powerabout]

It's the elephant in room, any 4s I've been behind that's running hard or just cruising stinks. However lean and clean they claim as someone previously posted they can't find the emissions reports from the manufacturer.
The guys that lost their 2s outboard development at BBD, were they out of ideas, only the new 4s converts know. Are other's still looking forward, yes with emissions on the front page.

Start a 4 slug in the tank in your office and see how long the staff last....
Start an e-tec in your office and they will never notice its running.

[John S]

Start a 4 slug in the tank in your office and see how long the staff last....
Start an e-tec in your office and they will never notice its running.

Now drink the water out of the 2S tank. I mean, it's biodegradable, riight?

[powerabout]

Now drink the water out of the 2S tank. I mean, it's biodegradable, riight?

Its total emissions that the EPA measure so no oil slick.
Saying that hard to believe BUT bia tcw 3 is not required to be biodegradable..

[FMP]

Not much to see after it's burnt

[powerabout]

Not much to see after it's burnt

The EPA agrees with that, they measured it

[FMP]

Ratio is crazy lean on the last 2s when it counts

[powerabout]

Ratio is crazy lean on the last 2s when it counts

years ago at a service school we left a v4 idling in the tank on straight fuel.
Came back an hour later it was still running but a little noisy.

[FMP]

Better watch out, browning of butter in a hot iron pan might be next

[David - WI]

Now drink the water out of the 2S tank. I mean, it's biodegradable, riight?

Since when does "biodegradable" mean "safe to drink"?

However, "biodegradable" products can vary greatly in how long they take to break down. A loaf of bread may require only a couple of weeks, and a piece of paper may vanish in a couple of months, but some "biodegradable" plastic milk cartons may take four or five years.

[John S]

Since when does "biodegradable" mean "safe to drink"?

Lol, really David? Wow. Well, let's look at the context of our two statements. I don't think there ever was a milk carton or bread issue in lakes and rivers. Although plastics are apparently now part of human composition due to the extensive use of plastics in our food containers, but that's for another day. Per my post, and if you understand the context of "biodegradable " in the sense of outboard (or any 2S oil), is that the expelling of this oil will not harm the environment it's going into (water). If you're in denial that over the course of time, oils have had a detrimental effect on our waterways, well then I don't know what to tell ya. I have a few engineering buds that specialize in this stuff that for sure do.

Per my post, if you believe a biodegradable oil into the water is less intrusive than a 4S oil system that is captured and recycled for other purposes... Well then, grab a glass and have a drink out of the tank. That really can't be that hard to grasp, eh? So yes, it has everything to do with drinking the water, as well as fish, wildlife, and vegetation in these waterways as well.

And while you're making a case for the ETEC, which I'm not sure you even have, it strikes me as odd that you're so happy to claim how clean it is, when I've read multiple times from you that trees/ vegetation absorb whatever CO/ CO2 emissions are put out anyways. So that kinda nullifies the importance of your argument, no? The emissions claim is a shell game, trying to convince us that used oil expelled is better than oil collected in a manner that it will be repurposed. Whatevs, sport.

For the record, I've run a s**t load of two strokes over my life. They're great motors, and I don't think they have the overall impact that some claim. But let's not kid ourselves that their cleaner. Like I said, have a drink.

[David]

I found EPA emisson data for outboard motors. I compared 2L 4 Stroke Mercury to 1.9L 2 Stroke BRP. There was not much difference in emissions. You could look up more engines if you wanted to.

Annual Certification Data for Vehicles, Engines, and Equipment | US EPA