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[aaronjb]

TB works in IT, like most things electronic its either on or off. Same goes when he applies the throttle and brakes, either on or off, nothing in the middle   

I work with a guy like that - the only trouble is he treats the steering wheel the same way! Every roundabout becomes 'square' - it's like sitting in a car being driven with a digital games console joypad 

[TheBoy]

Haven't used the Elite enough to get a decent record of range, but the MV6 used to manage between 340 - 360 before the botty clenching started about fuel gauge position, and would normally take 67-70l.  On a (sedate - constant 85mph) run, I have had 500m from a tank in the MV6 on petrol.

Damn it would be nice if (my) 3.2 did that - it'd be positively frugal! ~250 till the light is on with my daily commute, and ~375 on a 70mph motorway run.

I really should look into that  (no, I didn't manage to find my diag tool this weekend, Chris, before you ask  )

Same sort of figures I get .... don't know how TB gets as much as he does ... although the MV6 is a 3 ltr MFL I think .. perhaps the 3.2 FL has different weight & aerodynamics ??

Day to day, on petrol, the 3.0l auto MV6 used to manage around 24-26mpg over a tank on my normal commute. Remember, thats on petrol.

The 500m to a tank was when I used to do those French trips, and we used the autoroutes, thus sat at a shade over 130kph all the way.

[TheBoy]

TB works in IT, like most things electronic its either on or off. Same goes when he applies the throttle and brakes, either on or off, nothing in the middle   

I work with a guy like that - the only trouble is he treats the steering wheel the same way! Every roundabout becomes 'square' - it's like sitting in a car being driven with a digital games console joypad 

Depends if you are trying to provoke an ass wiggle

[aaronjb]

TB works in IT, like most things electronic its either on or off. Same goes when he applies the throttle and brakes, either on or off, nothing in the middle   

I work with a guy like that - the only trouble is he treats the steering wheel the same way! Every roundabout becomes 'square' - it's like sitting in a car being driven with a digital games console joypad 

Depends if you are trying to provoke an ass wiggle

Believe me, if this guy got the ass of his Civic to wiggle he'd end up in the nearest hedge  I've passengered with some interesting drivers, but he is something else!

[feeutfo]

Really can't decide you know. Cylinder or Toroidal?

If there was a bigger Toroidal that would fit I,d go that route again defo.

Might have to visit Tinley and physically try some for fit. Sigh....

[Cliffo B]

I think the largest capacity toroidal is 77L (61L useable) which will fit in my spare wheel well, it is the deepest within the 65cm dia range,which is the width of the wheel well. It does mean I will have to build up the floor.Must say Chris I wish I could have a greater range. On the good side theres a lpg station within 2 mls of home,and a larger capacity would mean more weight to lug around.   

[feeutfo]

Sorry should have said this an upright in a saloon.


Iirc old car might have had a 650x250 upright. Def 60 litre anyway. No room for extra diameter, so width would be no more than 270 if bigger at all. So that would give 70 litre gross, giveing 56 litres usable....   Bah, rubbish! 

Can the fill level be fiddled?   I reckon 63 litres in a 70 is fine.  .   

[Cliffo B]

correct Chris, I didnt realise you want the toroidal on a vertical mount the one I have for horizontal mount is a centre filled 4 hole at 650 dia by 270 high and quoted 77L capacity (61L usable) I would imagine the useable figure would change for an upright mount,not knowing the reason we can't make use of the full fill capacity of the tanks at the working pressures involved I wouldn't go beyond the safety margin if that is what is

[Kevin Wood]

correct Chris, I didnt realise you want the toroidal on a vertical mount the one I have for horizontal mount is a centre filled 4 hole at 650 dia by 270 high and quoted 77L capacity (61L usable) I would imagine the useable figure would change for an upright mount,not knowing the reason we can't make use of the full fill capacity of the tanks at the working pressures involved I wouldn't go beyond the safety margin if that is what is

That's exactly what it is. It's to ensure the tank always has some "spare" volume containing only vapour (as opposed to liquid).

If the tank were to be filled when cold (to 80%, say) then heated (in the sun during the day, for example), the liquid would expand to take up a greater volume within the tank.

Provided there is some volume containing only vapour, all that will happen is that the pressure will rise slightly, and a little of the vapour will condense to liquid, reducing its' volume, making space for the larger volume of liquid without greatly increasing the pressure in the tank.

This balance of liquid and vapour in the tank keeps the pressure more or less constant (but still temperature dependant) regardless of the volume of liquid. It's a bit like the boiler of a steam engine. You have a volume of liquid that's well above its' boiling point at atmospheric pressure, kept liquid by the pressure of vapour with which it shares its' surroundings.

If you fill a tank to more than 80% you are left with a smaller "buffer" of vapour so the tank can cope with less heating before you use up all the available volume.

Once the vapour volume gets too small the increasing volume of liquid cannot be accommodated so the pressure will rise much more markedly if the tank gets hot, and it may cause the pressure relief valve to vent.

80% is probably a pretty generous margin for our climate, where the temperature differences aren't great. I believe Calor gas cylinders are filled to 87%.

The problem is, the filling cutoff is something that should be tested during certification of an install, so tampering with the valve to get a higher fill level might give you a headache. Then again, unless the guy certifying the install does the "first fill" he's unlikely to notice, I suppose.

Kevin

[tunnie]

I over-fill mine slightly, as I over did it slightly when I rotated the tank. From dry I can get 74L in my 90L tank which is 82%

However I always fill up at High Wycombe which is at least 25 miles from my flat or 50 miles from home. So by the time I get to either I've already burnt off that extra 2%

[Cliffo B]

Ooooo,thank you Kevin, some facts that if haveing lpg are very much in users interest to learn and know , and thereby stick to those safety margins.Im about to start installing the tank in my estate today and Lazy tinker mentioned the forum is short of a "how to" for estates so I'll do my best to sort the pics for one as I go and then with the help of a friend, who works for a computer firm post them up