OK lets get down to brass tacks on this new Merc 300,,,

[mr fun]

looking at the pic of it on that yellow fin bay boat does not look so huge. how heavy is it? what does it burn at WOT? what is the warrantee and can it be extended? why did they not have it ready for the Miami boat show? what lowers are options and ratios? have they addressed the propshaft problems of the verado's? what is the recommended # of hrs before re-build? FUN OUT :cool:

[engineermike]

1. 512 lb, 300r
2. About 27 GPH (just my educated guess).
3. 3 yr standard
4. Your guess is as good as mine. Maximize publicity of each release?
5. Torque master, sport master, and sport master HD 5.44". All 1.75.
6 and 7, I don't know.

[JPEROG]

I think they released it early due to everyone talking about it after being at lake X. They still are not going to be out for a while (Mid July at best) and yes they have the solutions for the prop shafts.

Joe

[mr fun]

27 gph ??? that's a huge # ! so a pair is 54 gph and trips is 81 gph, I hope that is not correct. opti's don't burn that do they?

[engineermike]

I'm basing the fuel burn on some basic assumptions around crank hp and typical wot bsfc numbers. I just googled and found a 300xs test where it burned 26.7 gph at wot, and my 400r burns 38.4. We're talking wot here and it takes fuel to make power. Gas, diesel, 4-stroke, 2-stroke, efi, dfi, carb, are all surprising close in efficiency at wot (huge differences at part throttle though).

[Da Bull]

Just for comparison the 2.4 finger port Merc 200hp was rated at 25 GPH.

[XstreamVking]

I doubt it will be as fuel stingy as an opti at part throttle cruise. We will see. Real world #s here. My home built 26' shallow v hull with a 225 opti eats 9 gph at 32 mph running 32-3400 rpms. This is loaded for fishing with 4-5 people. It will get better #'s lightly loaded, but this is what I base my daily use on. 21p tempest prop, 55 mph top end just off the limiter running light. My buds with the 4 strokes are not getting the top end or the same lower fuel consumption as the opti. Merc suzy or yammi... Edit... burns mid 20's at wot...

[Thunderduck]

Looking to repower my fishing boat. Does anybody know the difference: "introduce multiple new 4.6L V-8 outboard engine models – the 250 and 300hp Verado®, 250 and 300hp FourStroke, and 200, 225, 250 and 300hp Pro XS®"

[powerabout]

I wonder what a 300 etec uses at WOT?

[RSWORDS]

Looking to repower my fishing boat. Does anybody know the difference: "introduce multiple new 4.6L V-8 outboard engine models – the 250 and 300hp Verado®, 250 and 300hp FourStroke, and 200, 225, 250 and 300hp Pro XS®"

The verado model uses the AMS mount and power steering. The 4 stroke is just the base motor. The ProXS models have a bit more umph ams some other performance oriented upgrades

[FMP]

http://www.boattest.com/engine-review/Evinrude/25500102_E-TEC-G2-300-HP

[engineermike]

I wonder what a 300 etec uses at WOT?

Found a couple of tests of google, 24.3-25.9 gph. Keep in mind it has much more to do with the power level than anything else.

[stoker2001]

) and yes they have the solutions for the prop shafts.

JoeHUUUMMM?I know you know Paul Wallner AKA Bully has 3 to his name,most recently the single on his new 22 talon

[mjw930]

HUUUMMM?I know you know Paul Wallner AKA Bully has 3 to his name,most recently the single on his new 22 talon

Aside from the motors what would be the common denominator? No one but Mercury knows the total number of failures but when one person has such a history you have to question cause and effect. These motors aren’t idiot proof.

[powerabout]

Found a couple of tests of google, 24.3-25.9 gph. Keep in mind it has much more to do with the power level than anything else.
Years ago when we raced carby 2 strokes you couldnt go wrong with the 10% of hp is usgph and that was crank HP so they are doing better today
200=20gph in the old money.

[BUZZIN' DOZEN]

Interesting thoughts from "Noli" over on OSS (oops, oso)

Originally Posted by noli https://www.offshoreonly.com/forums/images/buttons/viewpost.gif (https://www.offshoreonly.com/forums/general-boating-discussion/354476-300r-4-6l-v8-potential-hp.html#post4630825) .


a friend asked me what I guess the potential horsepower could be on the new 300R 4.6L V8 outboard motor.

I said there's no guessing, we can calculate the potential horsepower

currently the 400R motor generates 400HP from a supercharged 2.6L engine block

We first need to get the multiplier to determine the HP / Liter (in other words, what is the horsepower per liter)

That formula is

2.6 * M = 400 HP


calculating for M, we get

M = 400 / 2.6

M = 153.846

or in words, MercuryRacing is capable of building 153 horsepower for every supercharged liter of powerhead

so what is the 300R potential for producing maximum supercharged horsepower?

let's calculate again


4.6 * M = X where X is the maximum supercharged horsepower we can squeeze out of the 4.6L powerplant

we already calculated the M (multiplier) that 153, or 153.846 to be exact

thus

4.6 * 153.846 = 707 horsepower

in words it means, if we apply the same supercharging know how of MercuryMarine to their new 4.6L platform, we have a potential horsepower maximum capacity of 707 horsepower

let's detune that a little to make a race engine with 0 warranty of say 650 HP

detune that again to add warranty and we're down to a motor between 550HP and 650 HP

so thats the answer, the 300R when supercharged has the potential to develop 550~650 HP

[JPEROG]

HUUUMMM?I know you know Paul Wallner AKA Bully has 3 to his name,most recently the single on his new 22 talon

Its in the works "they have two methods to cure the problem" and need the approval of the high ups to stamp of approval to make a change. There is no way that they will continue to pay out the monster warranty claims.

Joe

[JPEROG]

Interesting thoughts from "Noli" over on OSS

Originally Posted by noli https://www.offshoreonly.com/forums/images/buttons/viewpost.gif (https://www.offshoreonly.com/forums/general-boating-discussion/354476-300r-4-6l-v8-potential-hp.html#post4630825) .


a friend asked me what I guess the potential horsepower could be on the new 300R 4.6L V8 outboard motor.

I said there's no guessing, we can calculate the potential horsepower

currently the 400R motor generates 400HP from a supercharged 2.6L engine block

We first need to get the multiplier to determine the HP / Liter (in other words, what is the horsepower per liter)

That formula is

2.6 * M = 400 HP


calculating for M, we get

M = 400 / 2.6

M = 153.846

or in words, MercuryRacing is capable of building 153 horsepower for every supercharged liter of powerhead

so what is the 300R potential for producing maximum supercharged horsepower?

let's calculate again


4.6 * M = X where X is the maximum supercharged horsepower we can squeeze out of the 4.6L powerplant

we already calculated the M (multiplier) that 153, or 153.846 to be exact

thus

4.6 * 153.846 = 707 horsepower

in words it means, if we apply the same supercharging know how of MercuryMarine to their new 4.6L platform, we have a potential horsepower maximum capacity of 707 horsepower

let's detune that a little to make a race engine with 0 warranty of say 650 HP

detune that again to add warranty and we're down to a motor between 550HP and 650 HP

so thats the answer, the 300R when supercharged has the potential to develop 550~650 HP






No question that the motor can make more power then that but what can the rest of the package handle without warranty claims. My guess is 550 will be close to what we will be able to buy off the showroom floor. Get that with a taller gear and look out....

Joe

[mr fun]

Interesting thoughts from "Noli" over on OSS

Originally Posted by noli https://www.offshoreonly.com/forums/images/buttons/viewpost.gif (https://www.offshoreonly.com/forums/general-boating-discussion/354476-300r-4-6l-v8-potential-hp.html#post4630825) .


a friend asked me what I guess the potential horsepower could be on the new 300R 4.6L V8 outboard motor.

I said there's no guessing, we can calculate the potential horsepower

currently the 400R motor generates 400HP from a supercharged 2.6L engine block

We first need to get the multiplier to determine the HP / Liter (in other words, what is the horsepower per liter)

That formula is

2.6 * M = 400 HP


calculating for M, we get

M = 400 / 2.6

M = 153.846

or in words, MercuryRacing is capable of building 153 horsepower for every supercharged liter of powerhead

so what is the 300R potential for producing maximum supercharged horsepower?

let's calculate again


4.6 * M = X where X is the maximum supercharged horsepower we can squeeze out of the 4.6L powerplant

we already calculated the M (multiplier) that 153, or 153.846 to be exact

thus

4.6 * 153.846 = 707 horsepower

in words it means, if we apply the same supercharging know how of MercuryMarine to their new 4.6L platform, we have a potential horsepower maximum capacity of 707 horsepower

let's detune that a little to make a race engine with 0 warranty of say 650 HP

detune that again to add warranty and we're down to a motor between 550HP and 650 HP

so thats the answer, the 300R when supercharged has the potential to develop 550~650 HP






so I guess I could buy one now, use it till the warrantee wears out and I get it paid for to futz around cruising, fishing, lil hot roddin, then look at jackin it up

[Dave S]

need to drop the Merc 1960 800 prop shft...goo to0 a sssm 3 for size...

[Dave S]

For those that don't know the merc ds and ps have had the same sizeee and spline from 1960.....80hp.

[engineermike]

The ones in question are fat shaft.

[stoker2001]

Aside from the motors what would be the common denominator? No one but Mercury knows the total number of failures but when one person has such a history you have to question cause and effect. These motors aren’t idiot proof.
Paul has more experience in High performance boats then 99.9% of anyone here,so you can take your cause and effect to you know where:rolleyes:

[stoker2001]

Its in the works "they have two methods to cure the problem" and need the approval of the high ups to stamp of approval to make a change. There is no way that they will continue to pay out the monster warranty claims.

Joeone would think Joe:cheers:

[Li'l Toy]

Its in the works "they have two methods to cure the problem" and need the approval of the high ups to stamp of approval to make a change. There is no way that they will continue to pay out the monster warranty claims.

Joe

So do you mean that they will come up with the solution before they manufacture the first lower for sale, or is there a risk that the first 6 months or year will have the risky shafts?

[Chaz]

Is this the 450r thread all over again ... ?

While it's easy to crunch numbers on paper and make them say whatever you want , making it happen in the real world can be a bit different .
Mercury supercharged a 2.6L ( I hate using chinese math ) x 61.02= 158.66 ci . ;) straight 6 and with the necessary inlet ducting to quiet the screw blower . The intake manifold cooler system . Electronic boost control / bypass system and the ducting required to make it function . All added quite a bit of size and weight to what is basically a scaled up , shim and bucket , cams driven from one end , 4 banger , 4 valve , 4 stroke , 105.7 ci 360 pound 115 natural / 510 pound 200 Verado .

Do people really buy a or multiple 300 hp outboards and toss and turn at night wondering what the old regime tree huggers rate their new motors at .. :rolleyes:
I have no doubt the new 280 ci motor makes the most out of a pound of fuel . It's the smart way to horsepower . If the new owners are pleased with how far they can go on a tank of gas , then I guess it will be a win-win .

They took a page out of the motocross bike program . Every excess ounce has been trimmed off to get the weight down . And it looks like they poured a cowling around it tight enough that you couldn't warm up a pastrami sammich under there .. :nonod:
With light weight castings lets hope for the boats that hang on davits that rarely get a wash out that they went with salt proof coatings . People bring me four stroke heads and blocks that look like they are made out of Alka-Seltzer . I feel bad for them , but some of it is just way beyond gone .

I'm sure they went to plated bores .If they used stainless valves and something like beryllium seats , so much the better . Those thing will go a long way in keeping the sea air from entering open exhaust valves and leaving a nice orange crust to scrape thru or beat out of the way at next start up .

500+ HP … LOL it just aint never enough .
The easy part to figure out is that a big motor needs a big blower to keep up with the cubic inch's. The hard part is where to put it and all the junk it takes to make it work properly . More size , more weight .
The reality of running a big blower soft xxxx's up the air distribution . If Mercury really see's a need to supercharge this V-8 I'm sure they will stick with the same game plan . Small blower for the size of the engine , turn it up , aftercool it and bleed it off early and have it run out of air right at or just before it gets to the limiter .
It would interesting to see . Pump gas , flat chambers , big bores , end discharge air pump and a long azz spider to get to all eight intake ports … evenly … :cool:

Chaz = thinkin I'd like to know the cam spec's and then put a head on the bench to see what kind of numbers it will blow at full lift . Gotta be 100 hp easy in the head , cams - valve springs , and wty friendly limiter … ;)

[engineermike]

Call me crazy....but if merc added 2 cylinders to a 475 lb 225 hp v6 to get a 505 lb 300 hp v8, then why couldn't they also build a 535 lb 375 hp v10 and a 565 lb 450 hp v12?

Simpler, probably lighter, easier packaging, modular manufacturing, cheaper mass produced common components, less training for techs and assembly lines, etc...

[Dave S]

Lost foam casting don't last in salt water.....

[CUDA]

Your supposed to buy new every five years silly.

[mjw930]

Paul has more experience in High performance boats then 99.9% of anyone here,so you can take your cause and effect to you know where:rolleyes:

All the more reason he shouldn’t be breaking every 400R he touches.

[powerabout]

when the gearbox has parts in it as big as a bravo it might work as a boosted engine but they might have to go down the route of reduction under the powerhead etc etc

[stoker2001]

All the more reason he shouldn’t be breaking every 400R he touches.
HELLO,you are on a go fast boating website.maybe you should go hang out on a rollbar/wakeboard boat website:nonod:

[Capt.Insane-o]

The jist of it is the spin welded **** ain't going to work anymore. Proberly what your going to get is a heavily coated 1 piece steel shaft.