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how to read mercury prop numbers


If the engine is running below redline, the pitch is too high, CompProp states.Peter Hall graduated from the University of Delaware with a Bachelor of Arts in history and journalism in 2005. the number indicates you have an original Merc prop. A propeller diameter that's too large will hit other parts of the boat. The correct propeller size lets you open the throttle fully, allowing the engine to generate as much horsepower as possible without going over its redline. (How much can I trust a tach that reads 1000 RPMs when engine is off?) The closest SOLAS prop is a 14 x 21 (SOLAS #1511-145-21). I can get about 38 MPH max (per handheld GPS) at around 5100 RPMs. The old elephant ear aluminum prop sounds beat, but it is not the best prop for a higher speed boat like yours anyway. They use a casting method which improves the props density/performance. Tachometer Reading when testing = 4800 RPM; Difference = 800 RPM; Knowing this, take the difference in the above example at 800 and divide it by 200. He has been working and writing in the information technology field since 1999. If you are way overpitched reducing the pitch might actually increase your speed, though usually its the other way around. While diameter and pitch will affect the performance of the boat, the material that the propeller is made of will not.

Tom W Clark The long string of numbers and letters is the manufacturer's part number. The diameter and pitch can be separated by the letter "X," CompProp states. Ultimately you may need to accept a compromise or be prepared to swap propellers. Arranged by Horsepower.

More info... boat is 1991 Outrage 19. I'm keeping it.

There are no industrywide rules to interpret this number. Mercury has never really used model years for much of anything other than "sales tools" in dealerships.

Thanks.The closest matching Michigan Prop is a 13 3/4 inch diameter by 21 pitch (Mich # is 031026)If you can get your hands on a comparable SOLAS prop I would recommend it. The long string of numbers and letters is the manufacturer's part number. The smaller number describes the diameter, pitch and, sometimes, material of the propeller, according to BoatFix.com. Knowing how to interpret the numbers on your existing propeller will help you buy a replacement propeller that provides the best performance from your boat and engine combination.There are two sets of numbers stamped on every propeller. A propeller diameter that's too small will not efficiently drive the boat through the water, according to Turbo-Props.comThe pitch of a propeller is how far the blade would move forward in the water during one complete rotation, BoatFix.com explains. serial numbers than listed in these guides.

Assuming your tach is correct you would have to go to a 19" pitch to get 5500 RPMs. Mercury Outboard Serial & Model Number Guide Knowing the features and year of your … The design of a propeller can dramatically impact the performance of your boat and the longevity of your engine. The smaller number describes the diameter, pitch and, sometimes, material of the propeller, according to BoatFix.com. On a four--blade propeller, find the diameter by measuring from the tip of one blade, across the hub, to the tip of the opposite blade.
Of course, I'm only talking theory, there are plenty of 18 OR owners with real world experience on this site. 19" sounds like just what you need.Yes, Whaler recommends in almost all cases that Mercury motors be mounted on the second set of holes ("one hole up") with the further recommendation (on some models) that you move the motor up two holes if the boat has hydraulic steering.Does anybody know why this is? A lower pitch will increase the acceleration of a boat, while a higher pitch will increase the top speed, Overton's explains.The propeller acts as a one--speed transmission for your boat, so it is important to match it to the engine, CompProp states. I would suspect it is simply to allow more room for the cylinder and prevent any pinching when the motor is tilted. We WILL need your serial number to look up correct parts. 4 - 6 HP 7.5 - 9.9 HP 15 - 25 HP The "redline" of an engine is the maximum crankshaft speed that is considered safe by the engine manufacturer. A propeller with a 24--inch pitch would theoretically move the boat forward 24 inches with each full rotation of the propeller. Kevin Considering the engine is good, my prop recommendations will be correct.Larry's advice is good. It is a Mercury prop if the number starts with 48. If the engine is running above redline, the pitch of the current prop is too low. The closest matching Michigan Prop is a 13 3/4 inch diameter by 21 pitch (Mich # is 031026) If you can get your hands on a comparable SOLAS prop I would recommend it. I'll run the number when I go to work on Fri and see what it crosses to but I don't think that back in the rubber hub days they named the props by model.
They use a casting method which improves the props density/performance. Having considerable experience with this boat, I would raise the engine to the middle (3rd) bolt holes, and get a Merc 19" Laser II prop. No V-6 should be running aluminum.A friend had a 130 Yamaha on same boat, and I clocked him at 42 MPH. There is NO serial-to-year cross-reference chart for 1997 and later motors. The prop to use will be 4" in pitch less than the prop that was used during the test.

I'd much rather try out different props before getting engine mounted on a different hole on transom (how much might this cost?)

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