QBhoy
Well-Known Member
Have you re read some of your posts ? Self confessed idiot ! And a bloody dreamer. Anyway.
Mercury V12 600hp Verado Outboard Engine
- Thread starter Ian h
- Start date
PowerYachtBlog
Well-Known Member
In USA average hours are 200. Also most of the current OB seem to be changed after 1000 hours versus dieselss, which seem to last like thousands of hours.
Some of the CC do even north of 500 a season. Fuel is cheap in the USA.
longjohnsilver
Well-Known Member
I’m not disputing those figures. As I will never be in the market for one of these engines I’ve not researched any of the servicing requirements or costs.
Unfortunately, the way this thread has evolved is disappointing. No wonder people don’t bother with the mobo forum any more.
QBhoy
Well-Known Member
Totally agree. Decided to leave the forum. Not what it once was. Used to enjoy it. Such a horrible place now.
Hot Property
Well-Known Member
Some real figures from me for what it's worth assuming this thread still has legs....
23 ft sports cruiser, probably 2.2 tons all up.
200 Gen 1 supercharged Verado, 6 cylinder 2.4 litres. Intercooled etc.
15" original enertia prop.
Cruise around 19 knots I use 30 litres per hour.
WOT around 34 knots the consumption rises to about 85 litres an hour. In between these 2 speeds consumption is broadly proportional to speed.
I'm happy with the cost side of things as I don't have sterndrives or belts to maintain.
Once red diesel is phased out next April the economics of petrol Vs diesel will narrow considerably.....
23 ft sports cruiser, probably 2.2 tons all up.
200 Gen 1 supercharged Verado, 6 cylinder 2.4 litres. Intercooled etc.
15" original enertia prop.
Cruise around 19 knots I use 30 litres per hour.
WOT around 34 knots the consumption rises to about 85 litres an hour. In between these 2 speeds consumption is broadly proportional to speed.
I'm happy with the cost side of things as I don't have sterndrives or belts to maintain.
Once red diesel is phased out next April the economics of petrol Vs diesel will narrow considerably.....
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madabouttheboat
Well-Known Member
Yeah, you don't have to look to far to find one of those. You used a screen shot that you insist proves your point, but doesn't. You claim petrol engines are more efficient than diesels, but they aren't, You would be better off just backing away now, but you won't. Anyway, toodle pip and as they say, mind the door on your way out.
madabouttheboat
Well-Known Member
madabouttheboat
Well-Known Member
That is interesting as I used to have a 24ft sportscruiser of similar weight that had a proper old school Carb'd V8 230hp with a 15" prop. I used to cruise at 22 knots and burn around 45lph. Assuming if you upped your speed to similar, the fuel would increase a little to, lets say, 35lph, that does show how things have improved since the 80's.
Having said that, I did put a diesel in the same boat and for the same upped my fuel dropped down to 25lph, but that's by the by.
Hot Property
Well-Known Member
Yes they will, but diesel will still be in front because it is more efficient
I'm not disputing the fact that diesel is more efficient than petrol - I know its not!
What I am saying is that if you total up the overall costs of maintenance of a diesel engine plus drive plus fuel for a given distance travelled/hours run, then a petrol outboard is likely to be very close to the diesel powered costs.
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Mr Googler
Well-Known Member
I dont think the forum is horrible at all!
people are allowed different opinions......let’s not get too snowflakey ?
people are allowed different opinions......let’s not get too snowflakey ?
ontheplane
Well-Known Member
Not sure if you are still about Qbhoy, but the the screen shot showed nothing!
It showed that on YOUR boat, at the speed shown the engine was burning what it was. It doesn’t give ANY comparison between that and a diesel in the same boat on the same day in the same conditions!
The only comparison we can use is the bench figures, because they are the only ones that can be replicated and compared.
The simple fact is, your argument was about efficiency and diesel and petrol, and you stated that a “modern MPi petrol is way more efficient than a diesel” - then when proven wrong you start telling everyone they are wrong, misinformed and a few other expressions suggesting people don’t know what they are talking about which is when people start to get huffy. If you genuinely had been misled that petrol was more efficient than diesel that’s ok - some salespeople don’t always tell the truth when they sell boats. In reality, a petrol was probably the right choice for your boat anyhow given it’s weigh / size and desired performance.
The issue is that YOU asked US to show you one case where a diesel is more efficient than a petrol to support our argument and I show you 4.
WE ask YOU to show us one example of a petrol that is more efficient than a diesel and you can’t (because it doesn’t exist). At the point of MapisM posting his excellent table, you could have just gone “oh, I was wrong, fine” but you didn’t, you start calling intelligent people idiots, and thus showing yourself up a little - perhaps an apology would be in order?
Perhaps rather than everyone getting so het up we agree to disagree. Those of us who understand what efficiency is will know which engine is most efficient, and those who don’t, don’t.
Sadly I think this forum is getting more heated and unpleasant these days and I suspect lockdown isn’t helping with stresses and tempers, but it’s also not helped when some continue to argue black is white even when shown that what they have been told is not correct.
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willbank
Active Member
This was an interesting test run by MBY - three XO 270 hulls with different engines: 2 with inboards, 1 with outboards. This is a quick summary of the findings: “The outboard delivered peak efficiency of 37l/h at 20 knots, while the inboard gave us 21l/h at the same speed”
vas
Well-Known Member
not particularly surprising there, is it? 
we should keep in mind that the inboard setup was also heavier so if they'd ballast the outboard for the same weight (in order to check engine efficiency purely which I guess wasn't exactly their aim) values would be even better for inboards?
no time to check the video atm!
we should keep in mind that the inboard setup was also heavier so if they'd ballast the outboard for the same weight (in order to check engine efficiency purely which I guess wasn't exactly their aim) values would be even better for inboards?
no time to check the video atm!
Hot Property
Well-Known Member
Interesting test!
The last bit of the summary:-
The last bit of the summary:-
ontheplane
Well-Known Member
But surely that can't be right because Qbhoy says petrol is more efficient - surely.MBY have got all their figures completely wrong. You know the actual, real, scientific ones.......... we must all be idiots and lunatics.....
In true Trump style I suspect he'll now come in and say that this test shows he was right all along and this proves petrol is more efficient!
Also, the payback figure doesn't allow for the extra servicing, but also not the enhanced resale.....
In true Trump style I suspect he'll now come in and say that this test shows he was right all along and this proves petrol is more efficient!
Also, the payback figure doesn't allow for the extra servicing, but also not the enhanced resale.....
Mr Googler
Well-Known Member
Made your point....no need to keep on
Rappey
Well-Known Member
I know someone with a 1500hp caterpillar. At a good crusing speed it uses about 59gph, 265 l/hr.
I could buy myself a really nice boat for what it costs to fill his tank.
I could buy myself a really nice boat for what it costs to fill his tank.
ontheplane
Well-Known Member
Apologies Mr Googler (Made your point....no need to keep on)
I think I took exception to the below comment and the - “you are talking rubbish” comment.
He then went on to call pretty much everyone an idiot....
I dislike it when these forums deteriorate into personal attacks (whether to me or not) especially if the attacker is talking utter cobblers, and slagging off people who clearly DO know what they are talking about as many who’ve added to this post clearly do.
Anyhow, to move on, is it absolutely confirmed we will lose Red diesel from April, and is that lose the reduced tax but the fuel will still be red, or the fuel will need to be white? And what happens on an old boat if there is still some red in the tank in say 6 months, 2 years or whatever?
I think I took exception to the below comment and the - “you are talking rubbish” comment.
He then went on to call pretty much everyone an idiot....
I dislike it when these forums deteriorate into personal attacks (whether to me or not) especially if the attacker is talking utter cobblers, and slagging off people who clearly DO know what they are talking about as many who’ve added to this post clearly do.
Anyhow, to move on, is it absolutely confirmed we will lose Red diesel from April, and is that lose the reduced tax but the fuel will still be red, or the fuel will need to be white? And what happens on an old boat if there is still some red in the tank in say 6 months, 2 years or whatever?
ontheplane
Well-Known Member
Yup - some of these big boats make the eyes water with the running costs, but hey, different world I guess.
Mr Googler
Well-Known Member
We all know the answer to fuel economy but are afraid to admit it. Involves wind, canvas and weird names for “ropes”
been around for years apparently
been around for years apparently
