540cid Engine Upgrade Option
 

Here is a possible engine re-power option. What do you all think about it?

Check out the Power Boat Nation website and go to the below section.

Mercruiser's New 540CID Replacement Engine Package

great for your searay. Only spins 4600 rpm. Sure you could recam it and a bigger carb and really bring it to life, but there goes the Merc warrenty.

I agree. Would be good for (sport) cruiser's and thus if they build them well many, many hundreds of hrs before any top end rebuilds.

I'm really curious about it also. Could work well for my bowrider. I've requested pricing from a couple of places, should have it on Monday. Anyone know how strong the internals are? Good strong forged stuff like previous 454/502 Magnums?

Power 440 HP (328 kW)
Full Throttle Range 4200-4600 RPM
Displacement 540 CID (8.9L)
Engine Type 8.9L Mercury V8 Iron Block & Remanufactured Heads
Bore & Stroke 4.50” X 4.25” (114 mm X 108 mm)
Compression Ratio 8.6:1 With Forged Pistons
Rocker Arm Ratio 1.7:1 Stamped Steel
Fuel Requirement 87 Octane (R+M)/2
Fuel System Holley 800 CFM Electric Choke Carburetor, Mechanical Fuel Pump
Induction System Single-Plane Aluminum Intake With Bronze Crossover & Pads
Ignition System Thunderbolt V with Knock Control
Charging System 65 Amp / 917 Watt Alternator
Water Drain System Multi-Point Drain – Hand Removeable Blue Drain Plugs
Exhaust System Iron Manifolds with 4” Dia. 316 SS Dry Joint Exhaust Elbows
Cooling System Thermostatically Controlled Raw Water – 143 F
Accessory Drive System Serpentine Belt
Lubrication System High Flow Oil Pump , Copper Oil Cooler, Oil Thermostat
Recommended Engine Oil SAE 25W50 FC-W Synthetic Blend Racing Oil
Audio Warning System Oil Pressure, Coolant Temperature, Drive Lube
Bravo One X & XR Ratios: 1.36, 1.50:1
Bravo One XZ Ratio: 1.50:1
Bravo Two X Ratio: 1.81:1
Bravo Three X Ratio: 1.81:1
Bravo Three XR Ratios: 1.81, 2.00:1
Dimensions (LxWxH) 34” x 33” x 27” (871 mm x 830 mm x 689 mm)
Engine Weight (lbs./kg) 1025 / 465
Fresh Water Cooling: Not Available
Engine Only Part Number 8M0085999