Mercury unveils new sterndrive engine

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0111_mercruiserDesigned to power everything from runabouts to express cruisers to houseboats, Mercury Marine’s new 4.3-liter MPI ECT (Multi-Port Injection, Emissions Control Technology) completes its fleet of catalyzed sterndrive engines, the company said.

The 220-hp V-6 meets EPA and California Air Resources Board emissions regulations.

“MerCruiser is committed to the gasoline market by providing … engines that not only meet emissions requirements, but deliver the best boating experience,” MerCruiser brand director Facundo Onni said in a statement.

The 4.3 MPI ECT is the seventh catalyzed engine in the MerCruiser sterndrive lineup, which is composed of engines from 135 to 430 hp. They are the 3.0 MPI ECT, 5.0 MPI ECT, 350 MAG ECT, 377 MAG ECT, 8.2 MAG ECT and 8.2 MAG H.O. ECT.

The 4.3 MPI ECT, which Mercury builds with a GM base engine, is compatible with Alpha and Bravo drives. It runs quieter and is more fuel-efficient than its predecessor, according to Mercury. In Mercury tests, the engine, which has a maximum rpm of 4,400 to 4,800, was 5 to 10 percent better in fuel efficiency at cruising speeds and 5 percent quieter in noise measurements, according to the company.

The 780-pound engine is easier to service, with improved access to the oil fill, a threaded dipstick, a remote oil filter and color-coded service points, Mercury said.

The 4.3 MPI ECT is available with MerCruiser’s SeaCore corrosion protection and SmartCraft integrated technology. Models with SeaCore carry a four-year warranty. Those that do not are backed with a two-year warranty.


5 comments on “Mercury unveils new sterndrive engine

  1. stan

     Man I know Mercruiser can build horsepower but the torque range on this firecracker will push large cruisers no problem

  2. Ed Fay

    F.Y.I. Consumer Education – Dealers cannot prevent mandated change, but Consumers will need to change old habits with new ECT engines.  Specifically, annual oil changes for ECT (catalytic converter-equipped “Emissions Control Technology”) will need to change to FULL-SYNTHETIC OIL “FC-W” oil type for specific reasons.  And, marine dealers, like Fays Marina, will want to train its staff to remind our new purchasers of this change with ECT motors for first service and winterizations - why?
    (1) phosphorus naturally found in motor oil will harm ECT components (O2 sensor and catalyst fouling), (2)  silicone from improper RTV Sealant, or coolant leak from closed circuit cooling systems will contaminate the Oxygen sensor and foul the catalyst too.  Blowby, leaks, and super-heated oil will permit phosphorus or silicone to get past the rings into the exhaust and catalytic converter with its O2 sensor.  So Full-Synthetic oils, not even blended-synthetics will be a requirement, so as to preserve ECT components. 
    Blurp from Mercury Marine ECT –
    Exerpt from
    CAUSES OF CATALYST FOULINGTo clean the exhaust, the catalyst inside the converter must be exposed to the hot exhaust gases. Lead, phosphorous and silicone can contaminate the catalyst and prevent it from working its magic. Lead used to be the most common contaminant, but is no more since it was eliminated from gasoline. Phosphorus is still a threat, and comes from motor oil. So if an engine is burning oil because of worn valve guides or rings, phosphorus will shorten the life of the converter…” 
    “…silicone can find its way into the exhaust if the engine develops an internal coolant leak through a crack in a combustion chamber or a head gasket. Silicone will ruin the oxygen sensor as well as the catalytic converter, so chances are if the converter has been fouled the O2 sensor will also need to be replaced.”

  3. 67-LS1

    Where did you find torque numbers? I have never been able to find published #s from Mercury.

  4. Marc

    Does Merc have any plans to indroduce something to fill the rather large gap between the ever-popular 135 and budget-buster 220, such as a 175hp/Alpha combo? A larger truck-based inline-4 or perhaps something like the Jeep 4-Liter inline-6 would do the trick, be less expensive to catalyze than a V-block and really give customers a better choice in the 17-to-20-ft range.

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