Diesel engine fuel consumption (sorry again but not boaty)

[mikehibb]

In one of the posts one here a while back a very learned member was posting how to calculate fuel consumption in litres or gms of fuel based on hp rating of the engine.
I thought that I had bookmarked that post, however alas not.

Would some one kindly either repost that information or point me to that thread, tried a search but no luck yet.

The reason is I would like to compare the figures against diesel consumption figures for some of our large generators that we have on one of our sites.

As always, thanks in advance for any help

Mike

 

[epervier]

Half a pint of fuel per HP at full throttle, was the old way of doing it, but with hi tech engine management systems, and better atomisation etc etc, it may not be true anymore

 

[Bandit]

From memory 186 gramms metric per kw hour.

All you have to do is decide at cruising speed how many kw you are using !

 

[Nickcf]

try http://www.answers.com/topic/fuel-consumption-1

 

[Divemaster1]

rough guide ... 200 grammes per hp/hr

and diesel weight at 0.86 kg per litre

100 hp outtake x 200 = 20000 grammes divided by 1000 = 20 kg/ hr

20 kg / hr / 0.86 = 23.25 L /hr divided by 4.5 = 5.16 gph

 

[mikehibb]

Many thanks all
Just what I wanted.
And yes the figures do match what I was looking for.

Cheers

Mike

 

[davey]

Large Diesel Generator Consumption

In one of the posts one here a while back a very learned member was posting how to calculate fuel consumption in litres or gms of fuel based on hp rating of the engine.
I thought that I had bookmarked that post, however alas not.

Would some one kindly either repost that information or point me to that thread, tried a search but no luck yet.

The reason is I would like to compare the figures against diesel consumption figures for some of our large generators that we have on one of our sites.

As always, thanks in advance for any help

Mike

Sorry this reply is so late but hopefully it may be of use to others. In the 1960s I worked at a transmitting station that had standby generators. The better engines were made by English Electric (I think they were the "L" type) Power output of the alternators was 500KVA each. The engines (non turbo) developed 750BHP at 300 revolutions per minute and the fuel consumption was 29 imperial gallons per hour. Fuel was red diesel as the bunker oil that was originally used was very troublesome. In particular the storage tanks and fuel lines had to be kept heated 365 days a year. Bunker oil also has to be cleaned with centrifugal filters, yuk! Anyway I remembered the 750 BHP and 29 gallons per hour and it is still a good yardstick for estimating consumption.
Many years later I looked at a smaller set in Cyprus. This set could never give its rated HP or KW. Although the hours run were very low, somebody (not me) had got new piston rings fitted which made things worse! The set was on a hill and in a hot climate, bad ventilation in the engine room as well. Ah well its not good politics to call the boss ignorant so I didn't pass any comments.
The English Electrics are similar to ships engines and are complete with ladders and walkways. Durability is excellent IF the lubricating oil gallery is pumped-up to 5 pounds per square inch before starting. At another place the lazy technicians didn't bother with the laborious pumping and the engines (not sure of the make) wore out and had to be replaced. £s£s£s - should have taken the cost out of their wages!

For those not familiar with the Imperial Gallon the legal definition is that it is the volume occupied by 10 pounds of freshwater.

 

[KevB]

Has anyone got an idea where I can find a torque/power graph for kad43's? I have seen them before on the volvo penta web site but can't find them anymore.

Thanks

Kevin.

 

[Powersalt]

Ok so is the consumption rated at engine not under strain? I ask this because recently we were discussing the pros of bigger engines in boats and the concensus of opinion amongst my group was that a larger engine pushing the boat at lowe revs and under less stress should be more efficient on fuel and actual consumption than an engine working hard under more stress

 

[ulyden]

Fuel consumption

Hi teck or not! The specific fuel consumption is more or less the same now as before. Modern hi speed engines have a consumption of 230-240g/kwh

That means 0,2 to 0,21 liters pr hk hour at 3500rpm

You have to go back to 1970 prechamber engines to have any big difference!

These engines had 310g/kwh or 0.27l/hph

If you go to a truck engie you vil get 200-210g/kwh 0.18-0.19l/h at 2000rpm.

A big meedium speed engie have approx 180g/kwh or 0.16l/hph at 1000rpm

If you go to at large engine the numbers are 160g/kwh and 0.145l/hph

Then you are talking about a 100 000hp engine at 100rpm!

 

[aquatom]

I find this system works well.....

 

[ulyden]

Fuel consumpion!

I find this system works well.....

Tried it on a VP41 engine! Owner missed 4knots and asked me for increasing the fuel amount! We used the same metod!
We used a hi precision weight to calculate the volume!