Fuel Consumption

Gwenadu · Post by **Gwenadu** » Mon Jul 11, 2005 11:23 am

eh guys! There is a metric system. ISO measures etc... USe them!!!

Paul · Post by **Paul** » Mon Aug 08, 2005 4:58 am

I have just done my first fuel consumption check and I was pleasantly surprised at the consumption. Previously I used to take two 20 litre cans to the airport and fill them with Avgas (100 octane). When I needed fuel I would just syphon from these cans. Now that I am prevented from buying Avgas and I have to use a normal petrol station, I know how much I am putting in the tank.

I had travelled 205.7 km mainly on open roads, although some town riding was included. When I filled her to the brim on Saturday she only took 8.77 litres. This gives a consumption figure of 4.26 l/100km. I found a very useful site that will do the conversion to Imperial (both UK and US). It can be found at :
http://www.convert-me.com/en/convert/fuel

My consumption works out at 55.21 MPG (US) and 66.31 MPG (UK).

Paul

redpaso · Post by **redpaso** » Mon Aug 08, 2005 5:08 am

Paul, this is impressive consumption.

What carbs do you run? & do you have any other mods or is it just down to the new rubber?

Post by **Skins** » Mon Aug 08, 2005 5:26 am

Must be something wrong with that site. Can't be that good.

How's the idling and throttle response now, Paul?

Paul · Post by **Paul** » Mon Aug 08, 2005 6:23 am

I have Dell'Orto PHM 40s, which I consider to be too big for this size engine. I have set them up according to Skins' step-by-step guide and she runs nicely now. I think I went too far with the adjustments last time and now the tickover is too low. I need to speed her up a bit. I will go through the process again. I also like the sound that they make when fully open at 4,000 - 5,000 revs. If I could rid myself of the need to hear this I think the consumption would be better...

I still have the problem that every now and again she will try to tickover at 3,000 revs. If I let the clutch out slightly while in gear the revs drop, and when I pull it back in it remains low.

I don't think that the new tyres have made any difference to the consumption, although I will write up some thoughts about them in the "My first new tyres" thread ("Topic" for you Skins) on Wednesday. I went for a long ride on Saturday and tried to see how far I could lean her over. I took a picture of the rear tyre when I had finished. Now I don't think that I "lean it over like a girl" (appologies to all girls, this is just a figure of speach).

Paul

redpaso · Post by **redpaso** » Mon Aug 08, 2005 7:06 am

Paul Mate,

If my economy was that good I would not be touching a thing :screwy:

I look forward to your thoughts & pics on the new rubber

Post by **Skins** » Mon Aug 08, 2005 7:06 am

Hmmm ... the idle rising to 3000 sometimes would indicate that unless there is some bad fit somewhere in the cables, making one of them stick sometimes, then more idle adjustment is required. The lower than ideal idle may also indicate that the carbs are not working properly together at low revs, and this situation may be exacerbated by the big carbs. The big carbs may make idle ajdustment a little more difficult than it might be otherwise.

It could take you a while to get right, Paul. It took me many, many hours, over a period of several months. But by Christ it was worth it. I was riding her just today, at low revs in city traffic, clutch fully home, just trickling along, smooth as full cream, marvelling at how gently she was moving.

Marinus · Post by **Marinus** » Thu Jan 12, 2006 4:23 am

I have worked out my consumption on a long trip with quite a strong head wind . I am 192cm (6,3”) and 95kg.
Consumption 5.4L/100km or 43.5 MPG U.S.
Another tank was 6.1L/100Km 38.1MPG U.S With a mix of city running and fast twisty open road running.
I have webbers.