CONDITIONS AFFECTING OPERATION - 6 PROPELLER SELECTION Best all-around performance and maximum engine life is achieved when the engine is propped to run near the top of (but within) the recommended full throttle RPM range with a normal load. See ENGINE SPECIFICATIONS for rated full throttle RPM for your model engine.
If full throttle RPM is above or below the recommended range as stated in ENGINE SPECIFICATIONS, the propeller must be changed to prevent loss of performance. A one-inch change in the pitch of a given propeller will generally change engine RPM by 150 to 250 RPM.
ENGINE RPM CHART
Generally, gross weight (total weight of the entire boat, including full fuel and water, optional equipment, passengers and other miscellaneous gear) is one of the major factors and should be one of the primary considerations when selecting a propeller. Other factors to take into consideration are as follows: •
Warmer weather and higher humidity will cause an RPM loss.
•
Operating the boat in a higher elevation will cause an RPM loss.
•
Operating the boat with an increased load will cause an RPM loss (additional equipment, passengers, etc.).
Model
Minimum Full Load
Preferred
Maximum
MP 5.0L
4600
4800
5000
MP 5.7L
4800
5000
5200
MP 6.0L
5200
5500
5600
MP 8.1L (STD)
4400
4600
4800
MP 8.1L (H.O.)
4800
5000
5200
CAUTION Prolonged WOT operation will shorten the life of your engine and could cause premature engine failure. See NORMAL CRUISING SPEEDS in SPECIFICATIONS. Problems caused by WOT operation are considered abuse and are not covered under the Crusader Warranty.
IMPORTANT NOTICE: Your new Crusader engine incorporates an RPM “MAX GOVERNOR” in order to prevent the engine from over-revving. Operation above the Maximum RPM listed in the chart above is not recommended. If your engine is operating above the maximum a higher pitched propeller is required to lower the engine maximum RPM to the Preferred RPM listed in the chart above.
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L510001-09
