Compare this figure to a 2.6lt supercharged Mercury Verado 250 outboard, which used 109lt/h at WOT during trials.Īs with the 350 MAG MPI the 6.2 engines started instantly hot or cold, didn't blow any oil smoke and were almost completely unobtrusive when trolling. However by 4000 revs - cruising speed for the 6.2lt engines in the 375 - the fuelflow had risen marginally to 56.0lt/h and even at WOT and 4700 revs the engines used 88.0lt/h each. At 2000 revs the fuelflow was 16.8lt/h, but because in the 375 the hull was starting to plane at 3000 revs the flowrate jumped to 41.0lt/h and even when the hull was planing at 3500rpm the flow was still relatively high at 50.2lt/h. According to the SmartCraft system fitted, at 600rpm the fuelflow for each engine was a mere 3.8lt/h, only six per cent greater than Yamaha's two-stroke HPDI 200 outboard!Īt 1000rpm the average was 7.3lt/h and 1500 revs 11.0lt/h, a reasonable consumption for offshore trolling speeds. At WOT and 5200 revs the averages were 81.4kmh and 92lt/h.Īlthough I have yet to test the 6.2 in a trailerboat, the twins I tested in a SeaRay 375 Sundancer sportscruiser showed the 6.2 to have a fuel efficiency increase over the 350 MAG MPI. Cruising at 3000 revs the average was 42.7kmh and fuelflow 42.7lt/h, while at 4000 revs and 64.3kmh the usage was 65lt/h. At 2000 revs the average was 16.6kmh and a clean plane was achieved at 28.9kmh on 2500rpm. Pushing a total of 2250kg including two adults, the trolling average was 6.1kmh on 600rpm and at 1000 revs we averaged 8.8kmh. Some time ago I reviewed the 350 MAG MPI/Bravo Three combination in a Sea Ray 220 Sundeck and it returned excellent fuel efficiency for a petrol engine this powerful. The MX 6.2 MPI is available with a choice of Bravo One, Two or Three legs - but for hulls such as Sea Ray's larger bowriders, the Three drive not only provides better out-of-the-hole performance but also faster wide open throttle (WOT) speeds because prop steer torque is eliminated by the twin counter-rotating props. However, the MX 6.2 MPI sterndrive version develops 320.4hp at 5000rpm (compared to 300.3 at 4800 revs for the 350 MAG MPI) but at the prop instead. Complete with 1:1 hydraulically-actuated Velvet Drive gearboxes, these engines weigh 373kg, only 4kg over the 315hp 350 MAG MPI inboard. The inboard "Tow Sports" versions are known as the MX 6.2 MPI and the MX 6.2 Black Scorpion and develop 320.4 and 340.5hp respectively (measured at the crankshaft) and both at 5000 revs. Browse our impressive selection today.Developed from the Black Scorpion 377, the 6.2 MerCruiser is available in two power ratings for skiboats and one output in sterndrive form, the latter being available with either raw (salt) water cooling or the Horizon heat exchanger model. We only carry OEM replacement parts and aftermarket parts from manufacturers we trust. NuWave Marine has been in business since the 1980s, and we know the importance of upgrading your boat’s engine with the best parts for the job. Find MerCruiser Gaskets and Other Premium Replacement Parts However, if it’s time to replace your whole exhaust system, consider buying full exhaust kits from NuWave Marine. If you need small replacement parts, bolts and gaskets from this collection will do just fine. Freshwater engines should need less monitoring, but it’s still important to keep a keen eye on all the little parts, like gaskets and bolts. Certain parts might last longer, but you’re really tempting fate by putting off this routine maintenance. MerCruiser 5.7 Exhaust Riser Gasketįor saltwater applications, it’s recommended that you inspect your exhaust every year, and replace your exhaust system every 5 years completely. Make sure you have the right MerCruiser spacer kits to connect your exhaust system parts, and make sure your MerCruiser 5.7 exhaust manifold gasket is in good condition. Even a small imperfection in this seal can have catastrophic consequences. Though you may not notice water seeping in from the outside, a damaged MerCruiser 5.7 exhaust gasket, for example, can be leaking small amounts of cooling water into your engine. Second, but no less important, come the seals between your engine and manifold, manifold and riser, and the riser and the rest of your exhaust. Keeping water out of your engine is really about two things: First off, make sure your riser elbow is at the correct height to prevent backflow. This goes for 5.7L and 6.2L engines as well. As part of your seasonal inspection, if you notice any wear, tear, or corrosion on your MerCruiser 5.0 gasket set, you should replace it immediately. When it comes to your exhaust system, the little things can make a big difference - or cause a big problem. NuWave Marine carries all the MerCruiser 5.0, 5.7, and 6.2 exhaust parts you need to completely redo your boat’s exhaust, top to bottom.
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