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Which would get better fuel milaege, and mid range acceleration
Triple 625's on a drive with a tranny(no bravo drive) or a pair of semi staggered 925's and dry sump#6's . Boat achieves approx the same speeds, give or take a few mph. When cruising at approx 45-60 just curious what what yield better milaege, and better mid range accelaration. Thanks Jeff
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Re: Which would get better fuel milaege, and mid range acceleration
my vote is twins
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Re: Which would get better fuel milaege, and mid range acceleration
from our experience with trips.....i dont think ur gonna get good enough mileage with either set up for it to matter :D ................................
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Re: Which would get better fuel milaege, and mid range acceleration
I would think you would have less maintenece and more reliability going with twinns. (1 extra motor could be more problems) I personally have never been a fan of triples. Having triples can't be comfortable to drive with 3 throttles either.
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Re: Which would get better fuel milaege, and mid range acceleration
Will the boat plane with two out of three motors?
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Re: Which would get better fuel milaege, and mid range acceleration
Originally Posted by f311fr1
Will the boat plane with two out of three motors?
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Re: Which would get better fuel milaege, and mid range acceleration
You will find that trips are not very fuel efficient since the center engine is really just along for the ride until you are looking for that last 10 mph. My buddy's 47 with 525s is great and runs an honest 90 but the center engine is basically free wheeling and throwing up a rooster tail until about 75. Then the tail flattens out and the rpms come more in line with the other engines. Usually at cruise of 60-65 the center engine throttle is about 2/3s what the outside engines are. And trips makes docking a little more interesting too :rolleyes:
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Re: Which would get better fuel milaege, and mid range acceleration
Oh, one other thing, if you go with trips make sure you have closed cooling, I know of quite a few cases where the center engine failed way earlier than the outside ones. Watching the water pressure on the Fountain it looks like the center engine gets some really disturbed water at varying speeds and conditions. Since the 525's have closed cooling it has not been an issue, but with a straight cooled engine I believe it is enough variance to cause isolated overheating in the center engine-possibly due to air pockets or aeration of the cooling water. At least a set of large sea strainers should be used to try and keep good solid water in the engine.
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Re: Which would get better fuel milaege, and mid range acceleration
Originally Posted by insptech
Oh, one other thing, if you go with trips make sure you have closed cooling, I know of quite a few cases where the center engine failed way earlier than the outside ones. Watching the water pressure on the Fountain it looks like the center engine gets some really disturbed water at varying speeds and conditions. Since the 525's have closed cooling it has not been an issue, but with a straight cooled engine I believe it is enough variance to cause isolated overheating in the center engine-possibly due to air pockets or aeration of the cooling water. At least a set of large sea strainers should be used to try and keep good solid water in the engine.
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Re: Which would get better fuel milaege, and mid range acceleration
our cig 42 revo with makin about 525 hp x3 we didnt run over 3000rpms for about 5hours ish and burned up nearly 350gallons
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Re: Which would get better fuel milaege, and mid range acceleration
I would think the 900 plus HP motors will be a lot higher maintenance.More stressed...
I would think the triple engine boat would be allot more expensing and would out way the fuel cost diff.Jeff you don't put enough hours on one to worry about fuel savings or the maintance issues on a high HP motors :D Rob :drink: |
Re: Which would get better fuel milaege, and mid range acceleration
Fuel usage SHOULD be much less with the twins !
Mid range MIGHT be a little better with the triples ? Docking will be easier with triples as you have a WIDE "track" to use ... just shut the center one down while docking ! The big benefit to having triples is the ability to "run home" on two if you loose one ... This doesn't suck ! The boat will feel more stable at speed as well "wide track" again ! Did I say you will USE alot more fuel with the triples !!! :drink: |
Re: Which would get better fuel milaege, and mid range acceleration
Jeff, not telling us enough. What is your secret "no bravo" drive?
Without that info, I can still give you my opinion that a triple boat will always be less balanced than a twin boat (or a quad boat). If in addition you're planning to short stagger the twins, that would probably be the best idea in terms of overall balance. As for consumption, I don't think you should be thinking about either option if that is a major concern. Twins should be less thirsty though. Maintenance would be a pretty close call in my opinion. Are 625s N/A? Docking? - what is your "no bravo" drive? Mid-acceleration?: once again, what is your "no bravo drive"? In any case, one sure thing is that a staggered twin with #6 drives will have a MUCH better resale value than a triple with "exotic" (read non-merc) drives. Nowadays, people tend to run away from triples rigged with non-mainstream stuff so I really think that your trip 625 will have odds heavily stacked against it. |
Re: Which would get better fuel milaege, and mid range acceleration
Originally Posted by super termoli
Jeff, not telling us enough. What is your secret "no bravo" drive?
undefinedI was looking at Arneson ASD-7's with the largest Bam tranny. Without that info, I can still give you my opinion that a triple boat will always be less balanced than a twin boat (or a quad boat). If in addition you're planning to short stagger the twins, that would probably be the best idea in terms of overall balance. undefinedIf I went with the 900-950's I was going with the #6's and a semi staggered set up. As for consumption, I don't think you should be thinking about either option if that is a major concern. Twins should be less thirsty though. Maintenance would be a pretty close call in my opinion. Are 625s N/A?[COLOR=DarkRed]undefinedundefined [/COLOR625-750's all naturally asp. Docking? - what is your "no bravo" drive? Mid-acceleration?: once again, what is your "no bravo drive"? In any case, one sure thing is that a staggered twin with #6 drives will have a MUCH better resale value than a triple with "exotic" (read non-merc) drives. Nowadays, people tend to run away from triples rigged with non-mainstream stuff so I really think that your trip 625 will have odds heavily stacked against it. |
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