Excess noise on board when you're underway really detract s from the quality of your recreational experience. I can’t emphasize the significance of this enough. I use an app called dB Meter Pro and have found it quite useful and accurate. If you have a smartphone, you can perform sound checks and add relevant numbers to your test while underway. Again, I recommend a comparative sea trial and maybe even a decibel level sound check. Boatbuilders are sensitive to this increased onboard noise, and part of any diesel upcharge is going to include enhanced engine room soundproofing. Diesel engines are noticeably noisier than their gasoline-fueled brethren. This also applies to another key concern: decibels. The proof is in the sea trial.Ī Crusader 5.7-liter gasoline engine with multi-port fuel injection. You can get really caught up in specifications. The best way to narrow this down is to try one of each version in sea trials and compare directly. The reality is that the actual performance differences from one engine package to another will vary based on the specific boat, engine torque, and horsepower curves for the engines and propeller choices. A test captain for Cobalt Boats recently described the difference between their gasoline-powered and diesel-powered engine offerings on their new Cobalt A-40 model : “The gasoline version of this boat certainly has adequate power to get it up on plane and running nicely, but the diesel version is much snappier, gets on plane more quickly, and just feels more responsive.” It’s safe to say that this experience is not unique to the new Cobalt. But, in the size range of about 35 to 45 feet there are still plenty of gasoline V-8 engines that can generate enough power to get these boats up and running. Once you get over about 45 feet, displacement weight really starts to dictate the power requirements, and diesels win out in terms of the torque and horsepower available to get these larger boats up and running. In the smaller boat sizes, price points are critical and extremely competitive. The reasoning behind this is pretty simple. Beyond about 45 feet, you’ll really only have one choice, and that will be diesel. But when you get into the bigger size ranges you'll often have choices. ![]() Smaller inboard or stern-drive power boats up to about 30 to 35 feet in length will typically only offer gas engine power. To begin, you’ll discover that powerboat builders will typically only offer choices of gas or diesel on boats in certain size range s. The new Jeanneau Leader 36 is offered with twin Volvo diesels in either 260 or 300 hp, or twin MerCruiser 5.7-liter 300-hp gasoline engines.
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