8 replies to this topic

[mariner]

Again from Enginelabs excellent site a new Yamaha boat engine

 

https://www.enginela...th-plant-resin/

 

 

Given Yamaha did the twin cam six for the 1960's Toyota GT they do have long histry of high revving in line engines

 

https://global.yamah...ories/0012.html

 

Of course I am sure somebody, somewhere will find a turbo to bolt on !

 

[cbo]

Yamaha is also making motorcycles - i.e. high-revving small capacity motors including inline configurations.

My old Honda would be doing 6.000 - 7.000 rpm for hours and with a pause every 2 hour would do so for 1.000+ kilometers.

That is not really news?

Edited by cbo, 28 April 2024 - 09:28.

[gruntguru]

The numbers are remarkable for a 1.9 litre 4 cylinder.

[Greg Locock]

Once upon a time I had a Mini with an auto box. I would cruise between Glasgow and Norwich, holding 80 mph indicated most of the way. My brother lent me a tacho and I discovered my long suffering A series engine was sitting at 5000 rpm at 80 mph. I removed the tacho.

[Magoo]

The pleasure boat engine business is buzzing these days. Mercury is offering a V12 outboard. 7.6 liters, 600 hp on 87 octane gasoline. $77,000 USD. 

[desmo]

My local boating lake doubles as our drinking water reservoir. Two-stroke boat engines were banned and that, I'm sure, drove a lot a new outboard sales.

 

It can't really be that difficult to design an engine to reliably run at 5000+ rpm for days on end, probably just expensive.

[Greg Locock]

The standard test for engine durability for a new design (and often as a production check) is 100 hours at full throttle at the red line. If the engine won't do that no other development work is done on it until it'll pass that test.

 

The A+ turbo passed first go, other engines, not so much, and some, never.

[Lee Nicolle]

Bigger outboard Boat engines have ran at 5000= rpm forever. The ring a dings higher. 7500 though from near 2 litre 4 stroke is impressive.

As for electric boats?? yeah that will happen, NEVER as pleasure craft require hours of running.  Customers of mine used to go skiing for the weekend and take a 200 litre drum of fuel with them plus a couple of jerrys and the boat would start with 15 gallons. Many ski boats run 9 hours a day for days during holiday periods with generally road car based V8s. Lets try to do that with an EV. Or even try to get the boat to the river, lake etc, For me the river is 90 min away so you would need to charge all day just to get home again. So a ICE engine is imperative. 

Someone was telling me that someone built a Mitsi engine for a boat,, all sorts of hassles to semi marinise with a heat exchanger. 300hp turbo engine which blew up on the second day! And no it did not overheat but had to run very hard to make suitable power. Last I heard the 308 was going back in.

[gruntguru]

As for electric boats?? yeah that will happen, NEVER as pleasure craft require hours of running.  . . . . 

Love that word NEVER. Still using it many years after electric boats first appeared. Hell - electric ferries are in operation all over the world - right now.

 

What do you think of electric buses Lee? Garbage trucks? These two categories are currently being rapidly electrified.