Got in an interesting conversation today with a guy about which makes a faster boat, This guy tells me "torque" is what you want and I kind of disagreed with him. He says torque is what pulls you up to speed and horsepower doesn't count. So I was thinking... torque is optimum for heavy vehicles going fast, overcoming the wrong gears, or running it in a parking lot.
I contend that in a boat the size and weight of most flattys "horsepower" is what makes the boat sing and lets face it, most boats with medium layup don't weigh more than 1500 to 1800 lbs and in my book that's where horsepower can, does, and will outrun a boat that's 2500 lbs with a torque monster for a motor. Since boats are so light, it makes sense to be able to spin up your motor (s) to a higher rpm to gain the increase in rpm as fast as possible and spin the hell out of your prop enabling it to take a quicker set and just plain be faster over a torque motor. I would rather spin one up as fast as possible to let the prop do it's job at the max rpm you run WFO. I believe the more aggressive you get in the rpm band by selecting your components to compliment each other, the sooner you are hauling ass. So what are your thoughts on the torque vs horsepressure issue based on having a boat that's usually half the weight of a car, and the lower the weight... the faster the car "or boat" almost 100% of the time. What I also told him was, he needs to make sure his combo makes peak power in the rpm range the boat is expected to run @ speed, (by the way, we are talking about a flatty here). I learned that to make a 18' flatty fast you have to wind it up quick to make it get out of the water, take a set and just plain leave the guy next to you sitting there. On the otherside of the coin, if you are running a 21' daycruiser, because of the weight difference you need torque to get any kind of speed out of it, and rpm has less effect on speed than brute torque in a heavier boat. So what do you guys think... and PLEASE, I want your answers based on FACTS, not what you think or believe as we all view the same things differently, hopefully based on experience and of seat of the pants been there, done that. I'm sure some of you have hurt a motor, changed things up when you built a new one and could tell the difference between different levels of your build. You guys will either shoot me down in flames, or reinforce my theory by common sense or help my buddy shit in my neck. Share your combos, speed and weight of your boats and lets compare similar weight boats by estimated hp & tq and maximum RPM @ top speed. I really want some good input here, because if I'm talking out my ass I might need to change my combination of compression, heads, cam, intake & CFM of the carbs, in hoping I can gain 5 or more MPH based on the hp/tq argument. Thanks for giving your input on this and maybe teaching all of us we may be going about making our boats fast the wrong way, you are never to old to learn something and most of you guys know your shit, willing to share, and help some of us from spending money needlessly to gain nothing. ~You're opinions are priceless~ ... Larry