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 10-11-2017, 13:15 Post: 102949
DRankin



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 RTV 900 Dream Engine

Click on the link and scroll down to the D 1105-T-E

It appears to be the same physical size as the current RTV engine but it produces 50 percent more horsepower.

Hello, Kubota?






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 10-11-2017, 18:09 Post: 102956
Archdean



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 RTV 900 Dream Engine

It is also turbocharged (something you really want to contend with?)






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 10-11-2017, 23:03 Post: 102963
DRankin



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 RTV 900 Dream Engine

Living a mile above sea level does cause ones mind to wander in strange places.

I would settle for a normally aspirated 30 horse engine.






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 10-12-2017, 03:58 Post: 102975
Art White



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 RTV 900 Dream Engine

What would that type of option be worth?






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 10-12-2017, 08:52 Post: 102980
Archdean



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 RTV 900 Dream Engine

little to none for me but I'm now a transplanted Flatlander!






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 10-12-2017, 13:47 Post: 103003
DRankin



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 RTV 900 Dream Engine

What's it worth?

That begs another question. I have never understood why an engine with a larger cylinder bore, and all else equal, costs more than the smaller displacement version. I can't see where it would cost more to manufacture, given it has the same number of parts and uses the same block of steel to start with.....

That said, and mindful that we are starting with a $10K machine, I would guess $1500 more for a normally aspirated 30 horse engine and maybe $1000 more to that for the turbo.

I am making the assumption here that the N/O 30 HP engine would be a 4 cylinder and the turbo 30 HP would be a 3 cylinder.

What do you think, Art?






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 10-12-2017, 18:41 Post: 103013
BrendonN



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 RTV 900 Dream Engine

Your engine cost comment makes me think of when the company I work for raised the horsepower level of one of the machines we build. This machine had a Cummins 5.9L and went up by 13 hp. The ONLY difference was the setting of the fuel pump. But, we had to pay quite a bit more for the engine. Cummins (and other engine OEMs) sell horsepower, not cubic inches. Within a given engine family, you pay XX dollars per horsepower, even if the mechanicals are the same. Of course, there are other costs associated with increased horsepower like upgraded cooling systems, stronger drivetrains, etc, that also raise the price to the end customer.






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 10-12-2017, 23:36 Post: 103019
Art White



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 RTV 900 Dream Engine

I think your pricing is about right taking into account you just have to pay more for horsepower anyway you look at it. Kubota builds conservatively the same way they rate there stuff. I would think it would be interesting to find one with about 300 or 400 hours on it to see what it would do after the break-in is beginning to take affect. I will make no garuntee that Kubota would even consider it but your dollar amounts would be right and the four cylinder would be out for room.






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 10-13-2017, 04:30 Post: 103027
DRankin



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 RTV 900 Dream Engine

I finally dug out my old flying gear and ran some numbers. Here is what I came up with, keep in mind the numbers apply to any normally aspirated engine:

My land is just about 5000 feet above sea level. In fact, the entire state of Nevada has an average elevation of 5000 feet, and it get to 100+ degrees every summer.

Under those conditions, the density altitude.... the density of the air that you and the engine are breathing..... is the equivalent of 10,000 feet on a standard day. And that is just where I start. Everywhere I want to go is uphill from there.

So what does that mean? It means that my RTV is only making about 70% of its rated HP on such a day. I am running on less than 15 horse power, and that is just around the house. If I hit a back-country pass on a hot day I am climbing some serious grades with 13 HP available.

Yes. I said 13 horse power.

Any wonder why I have to downshift a lot?






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 10-14-2017, 00:08 Post: 103269
monkeyman



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 RTV 900 Dream Engine

well can you add a turbo to the stock motor?






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