Here are some examples and results of larger displacement 3 cylinder motors racing in T-750.
Jake ran a 13 foot Checkmate with a STOCK 49 cubic inch, 70 hp, long shaft, big foot. I am guessing, but I think it was a 54 mph boat. Jake could run with pure T-750's for a few laps and tail off as the water got rougher.
Craig Fraser ran a race prepared Critchfield, 75 hp 49 stinger, short shaft, big foot. It was a 57 mph boat and ran top 2 in the class. The boat was TOO competitive and class members were concerned that with a lighter driver that boat would dominate the class. It ran one season.
Dan ran a stock 49 cubic inch, twin carb Mercury on a Delta. Dan didn't run a lot of races, but he has competitive when he did.
Craig Fraser ran a race prepared 13 foot composite Allison with a STOCK 3 cylinder twin carb Mercury. That was a 58 mph boat and Craig could run top 3.
Why the 3 cylinder twin carb Mercury is on probation. - we have not seen a race prepared Mercury 2 cylinder twin carb motor race in the class. Experienced racers believe the race prep Mercury motor on race prep hull at average T-750 weight would dominate the T-750 class. - the motor is a T-850 motor because of its displacement. - we don't want people building Mercury 49, 2 carb, race motors - there are lots of legal motors on the market place.
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