Fuel Saving tips required.

Hello again folks,
Does anyone have an idea about how much better off I'd be if I replaced the old 2.25 petrol fan, with a Kenlowe fan ? Also is it a wise move to do, i.e do I have to remove the oil cooler etc.?

Mines a 1971 Series 2a Lightweight that's all orginal i.e old carb, any tips for saving fuel would be welcome.
Thanks

you'd be nearly 200 quid worse off - i defy anyone to prove that kenlowes save fuel - am sure they do but the saving will be minimal

fitting nice tall tyres (750s) and keeping them properly inflated is a much more economical method of saving fuel

ah put a tenner in series in feb of this year and its prob only used a few quid, the secret is to strip it down so it cant possably move fer years , then yer save no end on petrol !

seans right, ah stuck 750 '16s on me 90 and yer can tell the difference, gearing and fuel consumption, not by a hell of a lot , but is a saving !

My 2 1/4 petrol seemed to be noticeably better on fuel with freewheeling hubs fitted, but I didn't take any proper before and after MPG readings. I'd say an electric fan is a good idea because they seem to make the interior heater work better and they can be switched off for wading so your HT electrics won't get so covered in water. I think they should be especially good for short journeys because the engine will warm up quicker. I've got an electric fan on my SIII, but I've always had one on it because of the non standard engine, so I can't say how much of a difference they really make to fuel consumption.

fans use 1 hp, the engine is 50 odd I think, so theres not a great deal of energy used.
Sorting out the carby, a plug and oil change is gonna save you more cash than a leccy fan.
Fenners is right about wading though, thats a good idea.
Is yours a mil spec?, they have an 8 blade fan which'll use more juice, commercial spec's only have 4 blades.

Well my 2.25 Petrol with 2 kids and lots of luggage did 23mpg coming down from Cumbria (180miles), steady 60ish so I was quite happy.
It has Kenlowe fan, freewheel hubs, weber carb and Fairey Overdrive. The overdrive I fitted but the rest came with the Landy when I bought her!

That was on Mud Terrain Tyres (Colways) which wouldn't help economy!

Some great advice here, Many thanks, Well spotted re the 8 blades, you guys know your stuff ..Charlieccu, I have to ask you, how many at a guess RPM Rev would your Landy be doing at 60mph, I'm toying with the idea of getting a Fairey so I thought I'd just ask...Thanks in advance..P.S Is anyone going to Tatton Park this weekend ? Classic Card Show etc Just thought I'd ask.

Do the fans use 1 hp throughout the rev range or is that an average?
I recon the fixed fan uses 5 to 10 % depending in the design of the blades.
My old Morris Oxford did 4 or 5 mpg better without any fan at all and that was checked several times on fill ups when I could afford it
From 28 to 33/34 depending on the weather, it always did more to the gallon in the winter, dont ask why.
My old truck went from 6 to 7mpg when a clutch fan was fitted, it very rarely cut in so was running 99% of the time with no fan turning.
The noise reduction alone was worth the effort on both vehicles.

Speed is the main reason for excessive fuel consumption, cut it down 10% to say 55 on the motorway and you should save 10% in fuel, the air resistance overcomes rolling resistance on a Landy I recon at about 35/40 mph so above that you are using fuel just to push air out of the way.

Well I don't have a rev counter but with overdrive you do about 60 for the same noise as 50! I'd recommend it but you need to change down for hills etc. I'm contemplating electronic distributor and some road tyres which would help. These Colways are great off road but a bit heart stopping on bendy wet roads!

Best fuel saving tip, is a ride on the back of an RAC truck

1 hp is an average, and thats for a ford cortina with a fixed fan, I was assuming that a landy will be similar, maybe a liitle higher or lower.
The fan will probably be more wastefull of energy at speed as it will be designed to move enough air at idle to prevent overheating, so at speed it'll move more than it needs to.
A leccy fan only comes on when needed which is rarely so you'll save a little fuel depending on where your driving.

Your oxford was more econmical in cold weather simply because the air was colder and more dense, ie more 02 per volume unit of air, therefore a more complete burn and more power/efficiency for the same fuel.
This is precisely why the likes of the 200/300tdi has an intercooler, the turbo compresses the air which compacts the same heat energy into a smaller area and has a similar effect of heating the air so cooling it improves efficieny.

drat and blast, ah well.

You are right about cold air being better for combustion though, cold clean air and plenty of it is what a diesel needs, so a snorkle can only be a good idea.

landylad said:

I have to ask you, how many at a guess RPM Rev would your Landy be doing at 60mph, I'm toying with the idea of getting a Fairey so I thought I'd just ask...Thanks in advance..

Click to expand...

It depends on the height of the tyres, but assuming they are 32" tall, which will be about right for 235/85R16 tyres, then the calculation is (1.148*0.782*4.7*1760*3*12*60)/(3.142*32*60)=2659 RPM

On smaller tyres, say 205R16 then the tyre height would be about 29" giving an engine RPM of about 2934

In case you're wandering where all these numbers come from in the calculation above, then from left to right:

1.148 is the ratio of the transfer box in high
0.782 is the ratio of the Fairey overdrive
4.7 is the ratio of the diffs
1760 is the number of yards in a mile
3 is the number of feet in a yard
12 is the number of inches in a foot
60 is the number of minutes in an hour
3.142 is pi.
32 is the tyre height
60 is the road speed in MPH

Snorkels have their drawbacks too, pipe resonance, and effective reduced diameter inlet pipe size, and ram vacuum effect.
Better than water in't th'engine though.