Diesels for boats
04-15-2008, 09:08 AM
#91
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Pat, I asked you why. Don't throw "why not?" back at me as a non-answer answer. Now please try again: What is the advantage of a 6-speed over a 2 or 3-speed in a boat? Do such narrow RPM bands really gain you anything? What is the limit of usefulness? If 6-speeds is good, why not 10 or 12-speeds?
Last edited by Njawb; 04-15-2008 at 09:11 AM.
04-15-2008, 11:04 PM
#92
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eurotrash
While I would love to see a marinized version of the Audi V12 that is in their Q7 SUV, to be fair to the other Le Mans prototype racers, the reason for the recent diesel wins is at least as much due to the rules differences for diesel-powered competitors as it is to any actual head-to-head advantage of the diesel engines over the more conventional powerplants.
Thanks for the reply, Pat. I agree with your vision of the marine diesel future completely, but I am curious as to whether 6-speeds may be too many gears. What is the advantage of having such narrow RPM bands when compared to something like a 2 or 3-speed transmission?
Thanks for the reply, Pat. I agree with your vision of the marine diesel future completely, but I am curious as to whether 6-speeds may be too many gears. What is the advantage of having such narrow RPM bands when compared to something like a 2 or 3-speed transmission?
04-15-2008, 11:10 PM
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Pat, I asked you why. Don't throw "why not?" back at me as a non-answer answer. Now please try again: What is the advantage of a 6-speed over a 2 or 3-speed in a boat? Do such narrow RPM bands really gain you anything? What is the limit of usefulness? If 6-speeds is good, why not 10 or 12-speeds?
04-15-2008, 11:21 PM
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Can't get no respect
You're right Pat ,Audi shocked the world when they won the Rolex 24 hrs endurance race for more than 2 years on a row with a Diesel power; they have a team that work together with lot of money and determination to make it happen.In the U.S, Diesel have not gain any respect in the high performance arena simply because the mayority of people dont believe on it,and there hasnt been a big company that would like to spend the big bucks and get this thing rolling simply for conflict of interest,so til then we'll be just a group of friends exchanging ideas in this forum....
04-16-2008, 12:31 AM
#95
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The Banks Sidewinder Dakota can out run that Le Mans car.[/QUOTE]
Only when both thrown off the mount everest.
If Audi was going to set their car up for topspeed only .....
you know the result
[/QUOTE]Only when both thrown off the mount everest.
If Audi was going to set their car up for topspeed only .....
you know the result
04-16-2008, 02:52 AM
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If!
Only when both thrown off the mount everest.
If Audi was going to set their car up for topspeed only .....
you know the result[/QUOTE]
Theres that "if" word again! Facts are:
Le Mans car 206 mph measured speed. Sidewinder Dakota 222 mph measured speed.
Le Mans car 660 hp. Sidewinder Dakota 735 hp.
Le Mans car 120 hp per liter. Sidewinder Dakota 124 hp per liter.
Why won't Audi bring that car out to the salt flats? ( We all know what happens to euro trash cars when they try to run with the big dogs)
04-16-2008, 08:34 AM
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Sure, that's the basic premise with any multi-speed transmission. My question is not about the basic premise, but about why 6-speeds is the right number, as opposed to 2, 3, 10, 12, whatever.
04-16-2008, 08:38 AM
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C'mon, a Le Mans prototype and a Bonneville racer are completely different animals competing under completely different rules.
04-16-2008, 11:07 AM
#99
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I didn,t see any sidewinder on Le Mans ,like Njawb said these two cars are totally different ,a multi million € downforce car set up for topspeed is nice to put in magazines (for the speed number only),so people will say ,wow thats fast,but it isn,t Audi,s goal,and if it was ,I would put my money on Audi.
Would love to see the sidewinder for 24 hrs on Le mans
A Corvette ZO6 with Ls7 will run 200 with 500 hp,do you really think the audi will only run 206 ....yeah maybe on the fastest part of the circuit where they measured speed.
Euro trash cars..................mmmmm
Would love to see the sidewinder for 24 hrs on Le mans
A Corvette ZO6 with Ls7 will run 200 with 500 hp,do you really think the audi will only run 206 ....yeah maybe on the fastest part of the circuit where they measured speed.
Euro trash cars..................mmmmm
Last edited by stirling; 04-16-2008 at 11:49 AM.
04-16-2008, 11:32 AM
#100
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As for the transmission speeds ,I think Shifter means that he used a 6 speed for a certain engine /boat combo,and he probably meant class 1 with 2 x seatek diesels (euro trash) with giant turbo,s that need to be spooled up,and kept spooled up for max thrust
I think , (and I,m no expert ) that the engine /boat combo is leading to a gearbox with X amount of speeds ,and its depending on the powerband /torque and rpm ,and boat type ,and racecourse to find how many gears you need .
And people like Shifter can probably tell from experience how many gears are needed if the engines /boat etc is given.
I think , (and I,m no expert ) that the engine /boat combo is leading to a gearbox with X amount of speeds ,and its depending on the powerband /torque and rpm ,and boat type ,and racecourse to find how many gears you need .
And people like Shifter can probably tell from experience how many gears are needed if the engines /boat etc is given.
