It is therefore obvious that Suzuki focuses more on all around uses, in a range of 20 to 35 knots, in which we usually operate our ribs at a percentage of 90%. In general, the combination of a large diameter propeller with a short pitch is more efficient than the combination of a small diameter propeller with a long pitch. lift the stern more out of water, which compensates the large weight of the four-stroke engines which are mounted on our transom.work better on heavy loaded boats or in hulls witch have a lot of drag ( more wet surface) during the ride.are more «economical» and therefore we have greater autonomy at low and medium engine speeds in most of the cases.have less slippage at low and medium rpm and thus achieve higher cruise speeds.respond better in rough seas, producing greater thrust which is necessary when our boat is trying to climb on a large wave.give greater acceleration at low and medium rpm.get the boat more easily and quickly on plane.Suzuki by following the rule: ‘the greater the reduction gear, the greater the torque at the propeller shaft is and the greater the diameter of the propeller can be turned’, focuses on the use of larger diameter propellers to take advantage of achieving greater thrust. Suzuki prefers higher (numerically) gear ratios because it is more interested in achieving greater torque and therefore greater thrust, while Mercury prefers lower gear ratios, at the same horsepower, because it is more interested in achieving greater speed. Obviously their different choice has to do with the overall philosophy of each company. #O2M GEAR RATIO VS O2J GEAR RATIO INSTALL#Of course, both Suzuki and Mercury are able to install the same gear ratios so as to have the same propshaft speeds. This means that the propshaft of Suzuki is slower but the torque which is produced is greater, while the propshaft of Verado is faster but the torque is less. on a Suzuki 300hp, at the same engine’s rpm, the propeller shaft rotates more slowly than a Verado 300hp.Īt 4000rpm the prop shaft of Suzuki 300hp rotates withĤ000 / 2.08 = 1923.07rpm, while of Verado 300hp rotates with 4000 / 1.75 = 2285.71rpm.Īt 6300rpm, the prop shaft of Suzuki rotates withĦ300 / 2.08 = 3028.84rpm, while on Verado at 6300 / 1.75 = 3600rpm. We note that at the same horsepower, Suzuki’s gear ratios are higher (numerically) than Mercury’s.
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