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What RPM should I run my outboard?
When a boat is over-propped (the propellers have too much pitch), the outboard(s) highest achievable RPM is lower than the manufacturer’s recommended wide-open-throttle RPM, which typically is between 5000 and 6000 RPM.
What is WOT RPM?
The WOT rating is the RPM range the motor should achieve when running at wide open throttle. If the propeller has too much pitch, the motor will not reach its optimum RPM at WOT, while a prop with too little pitch will exceed the recommended RPM limit at WOT.
What does wot mean in boating?
The proper propeller size for your boat and engine combination is based in part on the wide open throttle (WOT) operating range for your particular engine. You can find this in your operator’s manual, expressed in terms of a certain horsepower at a certain r.p.m.
Will raising outboard increase RPM?
Greenwood says that moving the outboard up one mounting hole – or 0.75 inch – will allow the motor to gain RPM at wide-open throttle because drag is reduced. “Or if you are already at 6000, raising the motor may allow you to move up one increment in prop pitch to stay at 6000 but go faster.”
How long can you run an outboard at full throttle?
In the case of that engine, the manufacturer specifies that it can run at WOT for 30 minutes without any ill effects.
What is WOT tuning?
The basic process for WOT tuning is much like part throttle tuning. The primary difference is that the target A/F ratio is usually much richer than stoichiometric. ( Nate Tovey) A safe (lower than the expected maximum) amount of ignition timing is chosen and target lambda is set to a slightly rich value.
Is 900 hours a lot for a boat motor?
The average marine gasoline engine runs for 1,500 hours before needing a major overhaul. The average marine diesel engine will run for more than three times that long and log an average 5,000 hours under the same conditions. The typical gasoline marine engine will run fine for the first 1,000 hours.
What’s the gear ratio on a Johnson Boat?
Johnson RPM Chart HP/Model WOT RPM Gear Ratio 2 4000-5000 1.85 3.3 4500-5500 1.85 3.5 4500-5500 1.85 4 4500-5500 2.08
Is the RPM on a Honda engine accurate?
*ALWAYS CHECK YOUR OWNERS MANUAL FOR ACCURATE ENGINE RPM RANGES. All trademarks remain the property of their respective owners.
How many horsepower does an Evinrude propeller have?
Evinrude RPM Chart HP/Model WOT RPM Gear Ratio 5 4-Stroke 5500-6500 2.23 6 4-Stroke 5500-6500 2.23 8 4-Stroke 5000-6000 2.42 9.9 4-Stroke 5000-6000 2.42
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