Diesel vs Petrol 2011!

[Ianj68]

Nope, not trying to prove anything to myself, in fact I don't think i've even thought about it before now
The standard fit to a US 315 is twin 350 magnums. I'm sure they go well but can't imagine much better than 15 gals per hour as a return from them, well that seems to be the rate talked about on the SeaRay owners forum. Mine has a single KAD44. The last trip I took across the channel I managed 5.5 gph at a steady 22kts.

 

[ian38_39]

Nope, not trying to prove anything to myself, in fact I don't think i've even thought about it before now
The standard fit to a US 315 is twin 350 magnums. I'm sure they go well but can't imagine much better than 15 gals per hour as a return from them, well that seems to be the rate talked about on the SeaRay owners forum. Mine has a single KAD44. The last trip I took across the channel I managed 5.5 gph at a steady 22kts.

What happens if you put twin Kad44s in yours and a single 260 hp petrol in the other variant? to compare them they have to be somewhere near comparable.

If you are running twin 350's I would guess you are not messing around at 22knots.

 

[Ianj68]

I can't say for sure as twin KAD44s wouldn't fit so is not commercially available but I would expect them to return roughly the same gph. I used burn about 9gph when I had a 23ft cuddy with a 5.7l V8. I can imagine a 30 footer being a little heavier so not quite as frugal

 

[lovezoo]

As this argument is still rumbling/belching black smoke* on, a few figures might help if anyone is seriously trying to weigh up the relative costs of petrol vs diesel.

Coastal Rides has the following second hand engines for sale:

Volvo Penta D6 435 Base Engine, Long Block. Rebuilt Ready as Exchange long block, Special at £14,000 + VAT

VOLVO PENTA D6 330 2009 MODEL EVC C BOBTAIL STERNDRIVE ENGINE COMPLETE DROP REBIULT UNIT WITH 145 HOURS, SERVICED, TESTED AND 3 MONTH COASTALRIDES BACK TO BASE WARRANTY AT £11,000 + VAT

Mercruiser 4.3 V6 Carbed Engine, Secondhand serviced and tested possibly 2 available at £1,950 + VAT each

Or if you want a brand new V8 including fitting, you can find this on ebay:

Brand new Mercruiser G/M 5.7L V8 Vortec base engine delivered and fitted at your boat location at your convenience (with a 1 year warranty) £4,484.32

Interestingly enough the compressor alone on the KAD32 (part number 3581061) costs € 4 653,05 + VAT, in other words about the same as a brand new petrol V8 fitted.

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*delete as appropriate for petrol/diesel

 

[ian38_39]

I can't say for sure as twin KAD44s wouldn't fit so is not commercially available but I would expect them to return roughly the same gph. I used burn about 9gph when I had a 23ft cuddy with a 5.7l V8. I can imagine a 30 footer being a little heavier so not quite as frugal

Twins will burn about half as much again and the Americans are claiming 1mpg for the diesel version of your boat so I would treat the figures with caution. For 1 thing US gallons just aint as big.

 

[Pennpromo]

The arguement/ discussion can go on and on, whichever choice you make should be the one you are happy with. I had a Petrol Sunseeker Mohawk in about 1997, as I recall it used to guzzle petrol. The new Mercruiser 377 Magnums in the Hunton appear to be quite economical, (as per my previous post).
Personally I always run the bilge blower for ten minutes before starting and I lift the engine hatch for a quick visual inspection and airing. So explosion is not on my worry list, (I also have a gas bottle).
As one poster says, diesels tend to have more hours because the fuel was cheap, I am sure that in 2011 most motor boat owners think far more about distance and fuel consumption whatever the type of fuel. Most of us have to save in one way or another to enjoy our hobby.
It would be good to see petrol more widely available and at less than exhorbitant prices but so long as you think about what you need and where you are going to get it, it need not be a problem.
You really can't beat the noise of 12.2 litres, 16 cylinders of petrol either!

 

[oldgit]

"and then spend hours on here justifing the purchas" (probably mainly to themselves)


and only 15 pages later .............see told you so

 

[lovezoo]

14 of those 15 pages are CX45WEK's posts.

 

[GrahamHR]

Due to the H&S/ public concern regarding safety I think I should forewarn people that I hope to use my petrol powered boat this weekend in Holyhead. I hope the £ 3 million insurance liability coverage will be sufficient.

Graham

 

[AndieMac]

Due to the H&S/ public concern regarding safety I think I should forewarn people that I hope to use my petrol powered boat this weekend in Holyhead. I hope the £ 3 million insurance liability coverage will be sufficient.

Graham

Hopefully I should be just outside the blast radius.....

 

[AndieMac]

"and then spend hours on here justifing the purchas" (probably mainly to themselves)


and only 15 pages later .............see told you so

Problem is with this subject, everybody wants to have the last word

 

[beejay190]

Now that diesel is so expensive, taking into consideration the diesel bug. Would we now be better off going for a petrol boat?

Having to keep the tanks full is expensive on diesel boats plus extra weight, probably two engines to have enough power, surely petrol is the way to go!

With marine diesel approx 30% cheaper than petrol, and a LARSON 240 with a D4 260 approx 50% more fuel efficent than the equivalent petrol engine boat i fail to see how you can draw the conclusion:

SURELY PETROL IS THE WAY TO GO.

I understand that a fellow LARSON owning forumite invited you to come over to Poole, but that you declined because of the fuel cost ( please correct me if i am wrong on this point).

No worries, we are hoping to visit Chichester soon - a LARSON owners meeting perhaps - with a diesel Bavaria chucked in for good measure.

Cheers