Malibu Boats Sportster Series, Owner'S Manual

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4-3
Engine/Drive Train
Engine
For information on engine service, maintenance, and break-in period, please refer to your
engine owner’s manual. The Required Maintenance Schedule included in this manual
covers the minimum maintenance required for Indmar engine packages. The Maintenance
Worksheet included in this manual outlines safety checks, lubrication, and general service
that should be performed at regular intervals. It is recommended that any engine
replacement parts used for maintenance or repair be supplied by an authorized Malibu
dealer.
Engine Specifications
Malibu Carbureted Malibu Monsoon Malibu Hammerhead LS1 Corvette
Vortec 310 HP 325 HP 365 HP 375 HP
Number of Cylinders V-8
Displacement 5.7L 350 CID
Bore/Stroke 3.898x3.622 in
4.0012x3.480 in (101.63X88.39 mm) (99x92 mm)
Compression Ratio 9.4:1 10.1:1
Compression Pressure (Note 1) Minimum 100 PSI (690 kPa)
Idle RPM in Neutral (Note 2) 650 + or - 50 RPM
Operating Range at Wide Open Throttle 4600-5200 RPM 4400-4800 RPM 4600-5200 RPM 5400-6000 RPM
Oil Pressure at Idle 4 PSI (41 kPa) Minimum - Hot
Oil Pressure at 2000 RPM 18 PSI (124 kPa) Minimum - Hot
Fuel Pump Pressure 8 PSI Max 30 PSI Min at 40 PSI Min at 50 PSI Min at
(55.2 kPa) Keyup (206.8 kPa) Keyup (275.8 kPa) Keyup (344.7 kPa)
Electrical System 12 Volt DC Negative (-) Ground
Minimum Battery Requirements 550 cca/700 mca/120Ah
Firing Order 1-8-4-3-6-5-7-2 1-8-7-2-6-5-4-3
Spark Plug Type MR43LTS AC 41-931
Spark Plug Gap .030 in (.76 mm) .045 in (1.1 mm) .050 in (1.3 mm)
Base Timing at 1000 RPM (Note 3) 10 Degrees Before Top Dead Center Non Adjustable
Thermostat 160 Degrees F (71 C)
Fluid Capacities
Crankcase (With Filter) (Note 4) 5.5 Quarts (5.25 L) With Filter
Closed Cooling System (Note 5) 12-14 Quarts (11.4-13.3 L)
In-Line Transmission (Note 4) 2.12 Quarts (2.0 L)
Walters V-Drive Transmission (Note 4) 2 Pints (.95 L)
Notes
1) Minimum recorded compression in any one cylinder should not be less than 70% of the highest recorded cylinder.
2) Measured using an accurate shop tachometer at normal operating temperature. Idle RPM on EFI models is not adjustable.
3) Timing must be set using special procedures indicated in the appropriate service manual. Timing cannot be set using
conventional methods. Special tool(s) required.
4) Always use dipstick to determine exact quantity of oil required. Do not fill above “FULL” mark.
5) Do not over fill. Correct level is 3/4" below filler neck when coolant is warm.