Where to Mount EFI throttle body on MerCruiser?
Mount the EFI throttle body with fuel injector on the intake manifold. Connect the new fuel line from the fuel pump to the fitting on the injector. Mount the ECU module at one side of the engine compartment in proximity to the intake manifold on the engine.
How do you add EFI to a MerCruiser?
Attach the new fuel line that connects between the pump and the new EFI throttle body. Reconnect the original wires to the new pump. Mount the EFI throttle body with fuel injector on the intake manifold. Connect the new fuel line from the fuel pump to the fitting on the injector.
What kind of fuel injection does a MerCruiser use?
Many contemporary MerCruiser engines employ electronic fuel injection, or EFI, that takes the place of carburetors used on older engines. The components consist of a throttle body, intake manifold, ECU module and sensors. Electronic fuel injection delivers a fuel and air mixture to the engine with more efficiency than carburetor fuel systems.
What’s the maximum vacuum in a Mercury MerCruiser?
Mercury MerCruiser’s specification for the maximum vacuum measured at the fuel inlet of any MerCruiser engine is: 2 in. Hg (7 kPa) maximum at idle rpm, 3000, full throttle and back at idle rpm.
What’s the difference between a 350 Mag and 5.7 EFI?
The 350 (5.7) is a GM small block. In “MAG” trim, recent versions produce 300 HP, and is an MPI. WOT RPM range is higher than non-MAG engines. The EFI version is rated 260 HP and is a throttle body. Despite the difference in HP ratings, I doubt you will see much of a performance difference between the two.
How many hours does a MerCruiser 350 MPI engine have?
The engine has about 100 hours on it. I was heading from Brooklyn, NY to Jersey, City cruising at about ~ 22 Knots against the current running the engine around 3400 RPM when I realized I had broken the rule about having enough fuel as I started my trip with what appeared to be a bit under a quarter tank of gas on my 70 gallon tank.
What’s the horsepower of a Merc 350 Mag?
Interesting note, I tore down a 1995 Merc 350 Mag EFI / MP motor with Bravo drive rated 265 hp at the prop. Later got a small block out of a 2000-02 MasterCraft ski boat. This motor was rated at around 330 hp or so. BOTH motors had IDENTICAL cranks, mains, pistons, block, cam etc.
What does idle air control on a MerCruiser mean?
Stands for Idle Air Control and it basically is an electronically controlled air inlet valve used to control the air intake at very low RPM’s (idle) when the throttle body valve is closed. If it sticks closed your engine will starve for air and shut down quickly.