At the moment i am doing some long outstanding upgrades on my beloved BRA. I have had it on the road for 18 years so I guess it is time I finished it.
The fuel tank has always seemed pathetically small. I have measured it and calculate the volume at 49 litres but I never seem able to get more than 30 - 35 litres in it. When the fuel gauge gets to empty it runs out!
I am thinking of having a new tank fabricated to give me 70 litres.
What capacity tanks do you have in the Hawks?
Any other BRA owners out there with a view on this?
Cheers
Fuel Tanks
- David Large
- Posts: 1045
- Joined: Tue Apr 03, 2007 7:28 am
- Location: Walsall
Fuel Tanks
David Large
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
Hi David I have the Hawk stainless steel tank and I reckon it holds 8 gallons (30L) If your tank is anything like the Hawk one it is deeper at the top so if you are calculating the capacity by multiplying the height, width and depth at the top you'll get too big a reading. Measure the depth half way up the tank and see what you get.
Cheers, Clive.
(If I'm not here I'm in my workshop or on the golf course!)
(If I'm not here I'm in my workshop or on the golf course!)
- David Large
- Posts: 1045
- Joined: Tue Apr 03, 2007 7:28 am
- Location: Walsall
Clive, I am allowing for the sectional shape of the tank and taking the averagewidth of the tank, multiplying that by the height and the length.
So at 30 litres you have a range of about 130 - 150 miles when driving economically and 100 miles when enjoying yourself!
Cheers
So at 30 litres you have a range of about 130 - 150 miles when driving economically and 100 miles when enjoying yourself!
Cheers
David Large
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
- Roger King
- Posts: 4396
- Joined: Mon Mar 19, 2007 10:29 pm
- Location: St Ives, Cambs
- David Large
- Posts: 1045
- Joined: Tue Apr 03, 2007 7:28 am
- Location: Walsall
My Rover (4.0 litre / stage 2 heads / fast road cam / Weber 500) I think certainly will do towards 30mpg at a steady 70 mph but do anything else and the consumption increases dramatically.
My tank (external dims) is:-
depth across the top = 355mm
depth across the bottom= 210mm
Vertical height = 230mm
Length across the car = 760mm
Therefore:
(355+210) / 2 x 230 x 760 / 1000 /1000 = 49.38 litres
Say 49 litres / 4.546 = 10.8 gallons @ 20mpg average = 215 miles.
I never get near that. Nor when I fill it do I ever really get more than 30 litres in it.
There is another oddity with my tank. If when I fill it up I submerge the base of the filler pipe where it passes into the tank, it must be trapping air because after a few moments, if the car is left standing, petrol gushes up the filler pipe, through the breather in the cap and onto the back of the car. There is a very very slight depression in the top of the tank around the filler neck and I suspect the filler pipe projects into the tank which would also lead to trapping air.
Sorry if this is all boring but I am trying to solve some irritating little niggles. I have managed with this for 18 years so in the scheme of things it is not that important, but with age and grumpiness comes an even bigger desire to have things right.
Cheers.
David
My tank (external dims) is:-
depth across the top = 355mm
depth across the bottom= 210mm
Vertical height = 230mm
Length across the car = 760mm
Therefore:
(355+210) / 2 x 230 x 760 / 1000 /1000 = 49.38 litres
Say 49 litres / 4.546 = 10.8 gallons @ 20mpg average = 215 miles.
I never get near that. Nor when I fill it do I ever really get more than 30 litres in it.
There is another oddity with my tank. If when I fill it up I submerge the base of the filler pipe where it passes into the tank, it must be trapping air because after a few moments, if the car is left standing, petrol gushes up the filler pipe, through the breather in the cap and onto the back of the car. There is a very very slight depression in the top of the tank around the filler neck and I suspect the filler pipe projects into the tank which would also lead to trapping air.
Sorry if this is all boring but I am trying to solve some irritating little niggles. I have managed with this for 18 years so in the scheme of things it is not that important, but with age and grumpiness comes an even bigger desire to have things right.
Cheers.
David
David Large
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
- David Large
- Posts: 1045
- Joined: Tue Apr 03, 2007 7:28 am
- Location: Walsall
Clive, forgive me for being pedantic here but at 1 gallon = 4.546 litresclive wrote:Hi David I have the Hawk stainless steel tank and I reckon it holds 8 gallons (30L) If your tank is anything like the Hawk one it is deeper at the top so if you are calculating the capacity by multiplying the height, width and depth at the top you'll get too big a reading. Measure the depth half way up the tank and see what you get.
8 gallons = 36.3 litres
and
30 litres = 6.6 gallons
There is a 20% plus variation here which will skew things a bit.
I probably need to go out more and try to discover a life!
Anway, I am going to try to get the tank out of my car this week and have a bigger one made.
cheers,
David Large
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
Bald surfer with a BRA 289, Porsche 968 Coupe and a Radical PR6!
Sorry DL, My mistake. I converted from Litres to US instead of Imperial gallons. Should be as you say 8 imp gals = 36.368 L.
I find when filling my tank it takes a wee while for the fuel to flow past the baffles. when the tank is fiiled to the bottom of the filler neck if you wait a few secs it will take more fuel, fill up and go down again several times.
You will also have to take into consideration the wall/baffle thickness, the float displacement and the unused quantity remaining in the bottom of the tank (governed by the height of the outlet pipe) to get the true useable capacity.
I find when filling my tank it takes a wee while for the fuel to flow past the baffles. when the tank is fiiled to the bottom of the filler neck if you wait a few secs it will take more fuel, fill up and go down again several times.
You will also have to take into consideration the wall/baffle thickness, the float displacement and the unused quantity remaining in the bottom of the tank (governed by the height of the outlet pipe) to get the true useable capacity.
Cheers, Clive.
(If I'm not here I'm in my workshop or on the golf course!)
(If I'm not here I'm in my workshop or on the golf course!)
- Roger King
- Posts: 4396
- Joined: Mon Mar 19, 2007 10:29 pm
- Location: St Ives, Cambs
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