540 Mag Bravo 4V versus 500EFI/525EFi
Looking at re powering my Baja. Currently I have a 496 Mag producing 375 HP. I was set on finding a 500EFI or 525EFI but during my search I came across a carbureted 540 ci 8.9L from Mercruiser. New engine which produces 440 HP and 540 torque. The HP is clearly lower than the 500 or 525 but my understanding is the 540 opens up a lot of upgrade options down the road which won't require computer upgrades like with a EFI. 540 new is selling for $17,900. Any thoughts on the plus or minuses of going the 540 carbureted route versus a 500EFI or 525EFI?
Disclaimer: Technically challenged but slowly learning thanks to many on this site. Thanks to all who chime in. |
Sounds interesting
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Find yourself a good stock bore 502 8.2 and build a 540, you can do it cheaper than 18K and make way more power than 450.........unless you have no engine skills...
Edit: just read the disclaimer......... |
BINGO...disclaimer. Little to no engine skills.
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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 Stamped steel rockers, 4600 rpm redline..... is that what you really want in your boat? |
We installed one of these engines in a 22 donzi and were very pleased with the performance of it. I would have to say it is slightly under rated power wise. Comes with all the nice accessories and hardware. For the price it is hard to beat. Later down the road the power upgrade options are easy and endless.
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Been looking at this motor my self, but here is a new 540 MPI with headers for 26.5K
Genuine Mercury & Mercruiser parts. Mercury Racing 540 EFI |
2 Attachment(s)
Looks like a nice package!
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Limited skills, I'd say to look at this. Plenty of hp right off the bat, lots of torque, and much less $.
502 HO Big Block Crate Engine | Chevrolet Performance |
Originally Posted by jamesjcowen
(Post 4559055)
Looking at re powering my Baja. Currently I have a 496 Mag producing 375 HP. I was set on finding a 500EFI or 525EFI but during my search I came across a carbureted 540 ci 8.9L from Mercruiser. New engine which produces 440 HP and 540 torque. The HP is clearly lower than the 500 or 525 but my understanding is the 540 opens up a lot of upgrade options down the road which won't require computer upgrades like with a EFI. 540 new is selling for $17,900. Any thoughts on the plus or minuses of going the 540 carbureted route versus a 500EFI or 525EFI?
Disclaimer: Technically challenged but slowly learning thanks to many on this site. Thanks to all who chime in. |
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