Location:Home > Turbo Industry News > Borg warner turbo > Quiet On The Lake! '89 Ski Nautique Has More Pep, Less Noise

Quiet On The Lake! '89 Ski Nautique Has More Pep, Less Noise

Time:2019-01-29 13:59Turbochargers information Click:

less more lake nautique Quiet

The Silent Performance package on the 351 engine, which is standard on the $20,000-plus Ski Nautique, makes a revolutionary redesign of the power train -- engine position, transmission and the exhaust system.

The redesigned components and layout of the '89 model make what seem to be contradictory promises: 20 percent more torque, 10 percent more horsepower, more ''out-of-the-hole power,'' and faster top-end speed -- and less noise and higher fuel efficiency.

The combination sounds undoable, but what I heard during a test run of the boat on Lake Conway convinced me. The changes have virtually eliminated the most annoying half of the engine's noise.

-- The market: These changes are not merely tinkering with engine specifications, but a deliberate response to competition and changing demands of the sport.

In competitive water-skiing, ski schools and expert skiers increasingly develop their own man-made lakes, and because these lakes are expensive, the smaller the better. Consequently, the skiers demand quick acceleration for these relatively small lakes.

At the same time skiers -- and their neighbors -- have been hunting for quieter motors.

-- Competition: To meet this demand Correct Craft's chief rival, Master Craft, came up with the Powerslot model, which it boasted as having the best ''out-of-the-hole'' performance.

The issue focuses on drive systems. Traditionally inboard tournament ski boats used the 1-to-1 direct drive system. (In other words, one rotation of the engine's drive shaft resulted in one rotation of the propeller.)

Master Craft's Powerslot, however, had a 1.5-to-1 gear ratio (1.5 engine rotations to one prop rotation). This created more torque at the shaft allowing for a larger propeller with less pitch, which created greater acceleration and more low-end punch.

Correct Craft had been wrestling for years to come up with an alternative. The company considered the 1.5-to-1 gearing but felt that system would cut fuel performance and top-end speed and decided to pursue a 1.25-to-1 transmission instead.

-- New design: Correct Craft's Larry Meddock and Paul Fletcher, whose Pleasure Craft Marine builds the Correct Craft engines, approached Borg-Warner with the idea. Borg-Warner, which had been the primary builder of transmissions for tournament ski boats, chose not to build it.

Copyright infringement? Click Here!