Fuel consumption

[hard1]

"8.5mtr rib, on the water typical weight 3200kg, 285hp diesel engine, overall consumption 1.1lt/mile (statute) which is a tad better than 4mpg. This includes all the running the engine has done...flushing, sitting at the quayside etc."


And.... from another thread in another Forum,
"2.5 ltrs per mile from the evinrude 225 E TEC on avr. doing 4500 revs around 27nts but needs proping up 19"p on at the moment going to try 23"p"

Originally Posted by codprawn

Actually that isn't that good - the Quinquari humbers with 2x Evinrude 250s do about the same (i.e. 1.1 lt per mile) - the ONLY real advantages are the cost and availability of diesel - but they are BIG adavantages!!!

Eh? Mr Codprawn, are you sure??

[codprawn]

Originally Posted by hard1

"8.5mtr rib, on the water typical weight 3200kg, 285hp diesel engine, overall consumption 1.1lt/mile (statute) which is a tad better than 4mpg. This includes all the running the engine has done...flushing, sitting at the quayside etc."


And.... from another thread in another Forum,
"2.5 ltrs per mile from the evinrude 225 E TEC on avr. doing 4500 revs around 27nts but needs proping up 19"p on at the moment going to try 23"p"




Eh? Mr Codprawn, are you sure??

If you read the earlier part of the thread you will see I was passing on the info that John from Quinquari gave a while ago - he builds these boats and runs a fleet of them - if anyone knows he does!!!

[DGR]

Originally Posted by eupa

Johnthan, please tell me were I can get a diesel fuel flow meter for $270.Pete

Pete- just seen this - will send you PM on Monday- doe you need the twin motor one or the single motor one.

Me too please!! The last quote I got for a diesel fuel flow meter was over £500 for a single diesel engine installation.........

D...

[codprawn]

Have you looked at the new Navman fuel computer for diesels??? Navman kit tends to be quite reasonably priced!!!

Ahh just looked at the price on Ebay USA - $869!!!

[hard1]

"If you read the earlier part of the thread you will see I was passing on the info that John from Quinquari gave a while ago - he builds these boats and runs a fleet of them - if anyone knows he does!!!"

OK, I'm suprised no-one else has picked this up. Sooo, what you're saying is that 2 X 250 ETECS consume 1.1 litres of gas per mile according to your research? That makes each engine consume a little over .5 litre per mile? have I got that right?

[Richard B]

Originally Posted by hard1

OK, I'm suprised no-one else has picked this up.

Certainly picked that up, and that appears to be exactly what John Price is claiming, and codprawn is quoting.

[Pete7]

Originally Posted by codprawn

Have you looked at the new Navman fuel computer for diesels??? Navman kit tends to be quite reasonably priced!!!

Ahh just looked at the price on Ebay USA - $869!!!

Yup £500 in this country,

[codprawn]

Wonder if it would be possible to buy 2 flow meters as used on diesel supply pumps etc - one on feed - one on return - zero them both and then work out the difference - would be a damn site cheaper but not very convienient!!!

[Pete7]

The Navman meter only came out this year, once the novelty has worn off the price might drop a little but can't see it going down much.

The cheaper option is to do the maths and keep the fuel tank fuel. The GPS give the total mileage for a journey and you should know the total range of the boat anyway.

Pete

[hard1]

Originally Posted by Richard B

Certainly picked that up, and that appears to be exactly what John Price is claiming, and codprawn is quoting.

Hmmm, over on another thread, another 250 ETEC user is claiming 2.5 litres to the mile and a mate of mine with the same, averaged about 1.8 litres to the mile last Friday on a charter, same consumption (on the day) as my 225 Opti. There's a whole lot of difference here. How can this be explained?

[Jono]

Originally Posted by hard1

….How can this be explained?

Boat load, Hull form, Prop size, Sea state, “driving ability”, Condition of hull “bottom”, wind, boat set-up, Constant throttle versus on-off driving, speed versus RPM, engine tune/service condition, Tide, and of course, ability to accurately measure and calculate……….

[codprawn]

Covered most of them but you forgot air temperature - makes a hell of a difference - engines work far better in nice cold dry weather!!!

[Jono]

http://dictionary.reference.com/word...002/06/29.html

....

[Hugh Jardon]

Originally Posted by codprawn

Covered most of them but you forgot air temperature - makes a hell of a difference - engines work far better in nice cold dry weather!!!

but wouldnt cold damper weather be better still as the water vapour would help cool the charge? bit like the water meth injection on the old piston engined aircraft.........

[codprawn]

Originally Posted by Hugh Jardon

but wouldnt cold damper weather be better still as the water vapour would help cool the charge? bit like the water meth injection on the old piston engined aircraft.........

Only if you were to mess about with mixtures etc - I remember one mechanic who was time served and qualified laughing at me when I mentioned water injection - then the subaru etc started using it again.....

[Hugh Jardon]

Originally Posted by codprawn

Only if you were to mess about with mixtures etc - I remember one mechanic who was time served and qualified laughing at me when I mentioned water injection - then the subaru etc started using it again.....

i guess my experience comes from the aircraft industry where 20 years ago the technology in radial piston engines was far far ahead of the automotive industry and air pressures and temperature etc affect an engine more than in any other environment and how these changes are compensated for. i specialised in aerospace engineering and learnt all about engines and how they work, air pressures, airflows, etc etc for both piston and gas turbine, was fun and comes in handy when fixing the lawnmower!!! did 10 yrs in the RAF for my trouble!

[Jonny Fuller]

Originally Posted by eupa

you can then calculate how much you have left in the tank.
Jonathan

I just look at the fuel gauge when it gets down to 1/4 full, I fill it up.

Am I making this all too simple for myself? should I complicate things?....I think not.

[DGR]

Originally Posted by Jonny Fuller

I just look at the fuel gauge when it gets down to 1/4 full, I fill it up.

Am I making this all too simple for myself? should I complicate things?....I think not.

The only way you could make it simpler is to find someone to fill it up for you (and pay) - now THAT would be useful...

[Jonny Fuller]

Originally Posted by DGR

The only way you could make it simpler is to find someone to fill it up for you (and pay) - now THAT would be useful...

Is that an offer? only it's showing 1/4 full at the mo!

(If you can't do the filling bit in person, cheques payable to J. Fuller please)

[codprawn]

Originally Posted by Hugh Jardon

i guess my experience comes from the aircraft industry where 20 years ago the technology in radial piston engines was far far ahead of the automotive industry and air pressures and temperature etc affect an engine more than in any other environment and how these changes are compensated for. i specialised in aerospace engineering and learnt all about engines and how they work, air pressures, airflows, etc etc for both piston and gas turbine, was fun and comes in handy when fixing the lawnmower!!! did 10 yrs in the RAF for my trouble!

I have fiddled(restored)quite a few aero engines over the years - one of my sad little hobbies!!!

An aero engineer from the 30s wouldn't really see anything that would suprise him about modern engines. Just look at the RR type R or Merlin.

Yes hot and high doesnt mean much to most people unless they are a pilot - fly into Nairobi or Mexico city and people are stunned by the difference!!!