See full version: Aquamatic Sterndrive Gasoline Engine RangeV8-DPS
With the variable valve timing, each movement of the intake and exhaust valve can be optimized for speed and load. Combustion will always be correct irrespective of rpm, resulting in higher torque and acceleration across the whole rpm range. here
With the Easy Drain system, the engine is drained from raw water in just minutes. Thanks to the anti‐siphon valve, this is possible with the boat still in the water.
The compact engine‐drive package facilitates installation. Thanks to the aluminum cylinder block and cylinder head, the low‐friction, lightweight pistons, and a cast‐aluminum oil pan, the power‐toweight ratio is excellent.
Volvo Penta Aquamatic Sterndrive V8‐DPS is a totally integrated package, powered by the 8‐cylinder, 5.3‐liter or 6.2-liter, freshwater‐cooled, direct‐injected gasoline engine with catalyst. Working together with the perfectly matched DPS Duoprop drive, this package offers very low emission levels, excellent handling, and impressive acceleration power. more
Key features and benefits for V8-DPS
Actually, the ratios for the SP have not changed all that much but there are more choices now. The chart I am using doesn't list the engines. just ratios. so this is a guess as to which engine/ratio on some. and/or if it pertains to altitude or not. I'd have to get into another book for exact ratio information:
What is the correct gear ratio for a 5.0 or 5.7 engine. I was told last year, but have forgotten. 1.6?
'KROGHS NEST' 1983 2260 Trophy out of Nordland, WA more
Pete
'KROGHS NEST' 1983 2260 Trophy out of Nordland, WA [links]
Mar 03, 2007 #6 2007-03-03T15:47 more
If you're starting from scratch, then you choose a gear ratio and prop pitch range that will work best for the specific application.
So, I'm a little confused. Is the prop under driven or over driven?
Guess that explains why I only have a 17 inch pitch prop on it. The thing is spinning really fast! I was wondering because my cousin has a slightly smaller and lighter boat with a 4.3 that pulls a 19 great, and can get away with a 21 if he's not pulling anyone. Had me a little baffled as to why I had a less aggressive prop and way more motor. I assume he has more gear reduction in his outdrive. more
so the short answer is, that your boat, assuming your uysing the best prop for the gear ratio you are running, WILL be faster with the higher mechanical reduction because it will allow you to run a prop that's better at converting torque into thrust. [links]
this is a bit of an oversimplification, but helps to think about it. more
that is for a 14" prop, pitches in the range of 26-28" are going to be the best for performance applications. Note that this assumes modern prop designs (prop design has come a LONG ways even in the past 10 years). here
In addition, direct fuel injection replaces multi-port fuel injection, and that precisely mixes air and fuel to provide faster acceleration, more stable rpms, improved low-end torque, and up to 8 percent better fuel efficiency. “We are establishing a new industry benchmark for acceleration, speed, weight-to-power ratio, fuel economy, emissions reduction, and proven reliability,” explained Ron Huibers, president of Volvo Penta of the Americas, at the 2015 Fort Lauderdale International Boat Show, where the new V8 was introduced. “Our new engines are going to power highly efficient cruising boats as well as some exciting new boats. We’re out to make boating more fun and easier for today’s families to discover the joy of being on the water.”
“Our new V8 and V6 engines also incorporate our tried-and-true rpm-based speed control, which automatically maintains speed,” Huibers said. “That’s a big plus for watersports. Volvo Penta was the first to pioneer rpm-based speed control back in 2008 and standardized it across our sterndrives in 2010.” [links]
“It’s amazing how much people love the sport of wakesurfing, and that’s where the new V8 and the Forward Drive are really good,” said Huibers, a watersports enthusiast who learned how to wakesurf over the last year. “If I can do it, anyone can do it. It’s like riding an endless wave. You are only five feet from the back of the boat, and when you are done you just jump off.” here
The new Volvo Penta 5.3-liter V8 gasoline engine is a perfect example of a lighter weight powerplant that produces the same horsepower as previous heavier engines. General Motors cranks out more than 4,500 of these Gen V aluminum engine blocks per day at its North American manufacturing plants, and although most end up in cars and trucks, Volvo Penta’s marine division gets its share and marinizes the blocks at its plant in Lexington, Tennessee.