How much horsepower does a 454 Magnum have?
The 454 MPI came in 2 different Hp version’s being the 330Hp model which was known as the 7.4L MPI, and the 385 Hp 454 Magnum MPI Sterndrive Model and 380 Hp 7.4L Magnum MPI. Both oif these engine models are easy to recognize by the large “Bread Box” style intake plenum mounted directly on top of the engine.
Can you put an automotive carb on a boat?
With no raw fuel allowed to puddle on the manifold outside the carburetor, there is no chance of deadly fuel fumes to accumulate in the bilge and no chance of explosion or fire. For these reasons an automotive carburetor should NEVER be used in a marine application.
How much horsepower does a MerCruiser 454 have?
Mercruiser Big Block 7.4L V8 Marine Engine Product Specifications
|Models||7.4L MPI||454 Mag MPI|
|Propshaft Horsepower (SAV1 Rating)||3101 (2752)||3851|
|Propshaft Kilowatts (SAV1 Rating)||2311 (2052)||2871|
|Displacement||454 cid (7.4 l)|
|Maximum rpm @ WOT3||4200-4600 rpm||4600-5000 rpm|
What is the difference between a marine carb and street carb?
The difference is in the bowl vent tube style. The marine carb has a J shaped vent tube. In the case of a float system malfunction where fuel is forced through the carb and out the bowl vent by the fuel pump, the fuel is directed back into the carburetor.
How much horsepower does a 7.4 MerCruiser engine have?
The MerCruiser 7.4L MPI is a gasoline powered, fuel injected, 8-cylinder, 4-cycle marine engine. It delivers 310 horsepower (HP) to the propeller shaft at a maximum of 4,200 to 4,600 RPM at WOT (revolutions per minute at wide open throttle). It is a large engine with 454 cubic inches (7.4 liters) of displacement.
What should the compression be on a 7.4 MerCruiser?
No cylinder should read less than 100 psi (690 kPa). Compression recorded on any one cylinder should not be less than 70% of the highest cylinder.
What size marine carburetor do I need?
To arrive at the most appropriate carburetor choice, there’s a basic formula: engine displacement multiplied by maximum rpm divided by 3,456. For example: a typical 355ci small-block—a 0.030-over rebuild—with a 6,000-rpm max engine speed would work well with a 616-cfm carb ((355 x 6,000) 3,456 = 616.32).
Is a MerCruiser 7.4 fuel injected?
The MerCruiser 7.4L MPI is a gasoline powered, fuel injected, 8-cylinder, 4-cycle marine engine. It delivers 310 horsepower (HP) to the propeller shaft at a maximum of 4,200 to 4,600 RPM at WOT (revolutions per minute at wide open throttle).
How much does a Marine 454 weigh?
|Engine Rotation||Left Hand and Right Hand|
|Weight||1150 lbs. (direct drive)|
|Maximum hp*||320 (239 kW) @ 4400 rpm|
|Fuel Consumption||24 GPH @ 4400 rpm|
How much does a MerCruiser 7.4 weigh?
I’m estimating from info I found, 800lbs fully dressed with out the trans.
What is the compression ratio on a stock 454?
Assuming the engine is stock, the key bottleneck is a weak 8.2:1 factory static compression ratio (and that’s optimistic; a non-blueprinted motor can be to of a point lower than its official rating).
How much compression should a 454 have?
A buddy of mine has a remanufactured long block with compression between 125-130 psi. The important thing is consistency between the cylinders – I’ve been told that within 20% is acceptable. Also 100 psi is the lower limit on compression readings for a 454 before you should have the engine serviced.
What Holley carburetor do I have?
It’s like a “VIN” for your carburetor and should be hand-stamped on the front of the choke tower to the right of the vent tube on most typical Holley carbs. The list number typically is four to six digits long and may or may not have a suffix number behind it. The date code will be right below it.
How much horsepower is a 7.4 L MerCruiser?
Who makes the MerCruiser 454?
Chevy Mercruiser 7.4L 454 mark iv REVERSE ROTATION engine kit marine.
What should the compression be on a 7.4 Mercruiser?