[Andy b]

Seems there's a new power option from Mercruiser.
Would be a great upgrade from the 4.3L and kind'a makes the 5.0L V8 obsolete!

Mercury MerCruiser 4.5L 250 HP Inboard, Sterndrive 2015 Engine Test / Reviews Videos, Specs, Fast Facts, Captain reports | BoatTEST.com

[Mariah1]

Neat. If my 4.3 ever gives out I want one of these


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[Andy b]

Seems to be all good things about the new motor so far.

This kind'a backs up my feelings about the old 5.0L though.

[Mariah1]

Love this.


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[Motoxxx43]

That is really impressive.
" Performance

Recently, BoatTEST.com was able to test one of the first new MerCruiser 4.5L engines on a sportboat. Our test weighed in at just under 5,000 lbs. (2,268 kgs), which is heavy for a 23-footer (7.01 m). Turning the twin bladed Bravo III, we got on plane in an impressive 4 seconds and reached 40 mph in just a hair over 16 seconds. Wide-open throttle delivered 44.8 mph burning 19.25 gallons an hour or 2.33 miles per gallon. Our most efficient cruise speed gave us 3.63 miles per gallon at 3,500 rpm with a respectable 29.4 mph speed."

That is ballpark weight with my 250 Shabah with a 7.4MPI and that speed is within 5 mph of my WOT...

[Andy b]

But i bet the 7.4 sounds awesome doing it :-)

[The Grand Lakey]

I wonder how much faster this would make my 180talari.

[Andy b]

It would be an interesting package!
I could stand to be corrected, but I think the 180's are only rated at 225hp.
Not saying that the boats wont take it but it would be a situation with insurance?
Best I've seen out of my 180 Diablo with 190hp, running light and on a tall prop has been 54mph.
With this motor (less weight/more power) I don't see why it wouldn't run near the magic 60mph.
Stability at those speeds might be an issue in an 18' boat. Could be fun though

[ShabahZ280]

Has anyone seen a list price for the engine though? I'll bet it's a pretty penny, especially since it's their own proprietary design...