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ALFADAN 654hp outboards

Old 05-22-2020, 07:23 AM
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Default Alfadan outboard engine


Interesting read on a new engine coming to market. Per their investment page, they will be testing on the Freeman 37 or 42.
Old 05-22-2020, 07:29 AM
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Maybe I will take the minimum $250 investment gamble.
Old 05-22-2020, 08:03 AM
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They claim to have figured out a new valve train design that would allow large displacement inline 4 cyl engines with 50% fewer parts ... one that all the car , motorcycle(!) , diesel , and aircraft engine manufacturers haven't been able to in the last 50 years . Tough nut to swallow .

Good post though - I'd like to see the design . I don't doubt they came up with something ... though crowd sourced funding is sketchy - send your money blindly , wolf of wallstreet style .
Old 05-22-2020, 08:19 AM
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I don't see the advantage of getting 650hp out of a 4cyl four stroke, naturally aspirated. Engine would need to be in the ballpark of 13 liters, and those pistons would be HUGE. The problem with huge pistons is there become inertial and piston speed limitations that hold the max rpm down. Lower rpm means lower swept volume per minute, which means less power per displacement. So to get 650hp you may need even more displacement, and then spin it even slower. There is a reason that high specific output engines use 6-8-12 cylinders, and that is in part the above. Also piston thermal management forces some limits.

Also, four cyl four stokes fire twice per rev. Make one that big and it will shake like crazy at low rpm.

Also curious why they are avoiding forced induction. Well proven on the Verado platform with only 2.6 liter. Want 700hp? Go to a 5 liter six and use forced induction and direct injection. Like an Ecoboost, but turbos are troublesome on an outboard. Go with a blower.

Maybe they have some magic answers, but I have my skeptic's hat on. Will follow.
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Old 05-22-2020, 08:21 AM
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I will keep my money in my pocket but interested to see the finished product. I thought it was interesting as well that Freeman was the boat of choice for the pretrial. Makes you wonder if Billy has some input in the design of it as well. Twin 645 with the weight of twin 450R on the 37 would be a pretty sweet combo.
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Old 05-22-2020, 08:31 AM
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Wonder where that's going to leave 7 Marine?
Just read about it.Looks to be about 5 yrs. out ! Looks like they are trying to obtain Investors at this point.

Last edited by Lone Ranger; 05-22-2020 at 08:40 AM.
Old 05-22-2020, 08:51 AM
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Originally Posted by Corndog38 View Post
I don't see the advantage of getting 650hp out of a 4cyl four stroke, naturally aspirated. Engine would need to be in the ballpark of 13 liters, and those pistons would be HUGE. The problem with huge pistons is there become inertial and piston speed limitations that hold the max rpm down. Lower rpm means lower swept volume per minute, which means less power per displacement. So to get 650hp you may need even more displacement, and then spin it even slower. There is a reason that high specific output engines use 6-8-12 cylinders, and that is in part the above. Also piston thermal management forces some limits.

Also, four cyl four stokes fire twice per rev. Make one that big and it will shake like crazy at low rpm.

Also curious why they are avoiding forced induction. Well proven on the Verado platform with only 2.6 liter. Want 700hp? Go to a 5 liter six and use forced induction and direct injection. Like an Ecoboost, but turbos are troublesome on an outboard. Go with a blower.

Maybe they have some magic answers, but I have my skeptic's hat on. Will follow.

I wonder if these gentlemen have come up with a way to increase displacement with some type of weird crankshaft like the Atkinson cycle. I know the Atkinson is down on power and probably not what they are doing though. I’m curious as to what they came up with.
Old 05-22-2020, 10:25 AM
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I would run away from this very very fast. About six-outboards-on-a-Cigarette-transom fast.

(It's not a "new engine coming to the market". It's "give us some money so we can play around with engines for the next five years because we are GENIUSES")
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Old 05-22-2020, 10:37 AM
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Does anyone remember the coolest cooler crowdfunding fiasco? And that was just a cooler!
Old 05-22-2020, 10:59 AM
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These are usually give us some money and we will see what we can do. However the CEO does have some clout in the designing engine arena. The concept of a lightweight high HP engine is always a good concept but the reality of it making to the market are slim to none. The Yamaha offering is just insane at 1000lbs. Merc has tapped the potential of naturally aspirated engines making plenty of power while being reliable and not weighing 1000lbs. I can’t see how a start up company is going to revolutionize the Marine engine design that has not already been played with by Mercury, Yamaha, Suzuki or Honda. Honda still surprises me that they have not come up with a 400+hp engine for the Marine environment. They have some small 4 cyl engines that can crank out some hp.
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Old 05-22-2020, 10:59 AM
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You guys can just send me money if you want . I'll give you updates often about how I'm enjoying it .
Old 05-22-2020, 11:16 AM
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Originally Posted by bsh102 View Post
However the CEO does have some clout in the designing engine arena.
The CEO runs a small business (<10 employees) in Florida supplying natural stone for flooring and such.
Old 05-22-2020, 11:52 AM
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135K per motor? Did I read that right?
That would get you quad F300's and a lot of change.
Rather have the quads, you will still plane up on 3/4 300's. That little prop not gonna plane a 45ft CC on one motor regardless of the torque or hp.
Old 05-22-2020, 12:14 PM
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They are using electric valves to get rid of the cams, chains/belts, etc. Probably direct injected too so they can spin the rpms way up to get the high HP. Big hurdle will be distribution and service network.
Old 05-22-2020, 09:29 PM
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Default ALFADAN 654hp outboards

Anyone know anything about the I4 beasts?


Old 05-22-2020, 09:47 PM
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A whole lot of marketing buzzwords and no actual info. Looks ok, but I have an outboard that weighs 60% less, makes 200% more power, and has 80% less moving parts. Pretty easy to make up random things with no evidence whatsoever. Feel free to donate some money to me though.

Also, have people still not realised that peak horsepower at a million rpm isn't what gets a boat up and on plane?

Alfadan also sounds like a Chinese company that has poorly copied a Yamaha or something.
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Old 05-22-2020, 10:34 PM
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Well, there IS 'actual info', "50% less moving parts" is just a rounded out figure derived from an I4 having 50% less cylinders than a V8, 50% more HP means they're comparing their HP to a 435 horse V8. Sounds good to me, IF they've built the thing to withstand 654 HP for longer than the warranty. Not sure the peak torque it's supposed to make without seeing numbers, but it will be at least 654 ft lbs@5252 rpm, and that's a lotta stress for a 4-banger
Old 05-23-2020, 12:50 AM
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Don't worry. They have a 2 cylinder 30hp prototype that kicks ass.


Old 05-23-2020, 12:59 AM
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Seems legit. Freeman test boat.


Old 05-23-2020, 01:31 AM
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I like the mafs. They have a 2 cylinder that makes 30hp, so another couple of cylinders should make 654hp.

I'm assuming the "less moving parts" is from them using no camshafts etc. That doesn't magically make insane horsepower though, unless you rev it to the stratosphere, not good for longevity on an outboard. Also, unless they are making at least a 7 litre or so 4 cylinder, they aren't making that power without forced induction.

Also, the sheer weight of high displacement 4 cylinder pistons limits the rpm they can spin.

I predict this will be yet another Kickstarter failure.

Last edited by brendanm; 05-23-2020 at 01:44 AM.
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