It occured to me that there is mucho sloshing of fuel going on in the tanks and I had better stuff them with foam chips.
Are there any options in this area?

i saw some the other day, might have been on rally design site they are 80mm cubes and cost 60p each, as a guide.

[Edited on 21/9/06 by Hammerhead]

I've thought about doing this - would they not interfere with your fuel sender?

Use a tube sender. The float is inside a tube.

Just had a look at the 80mm cubes. They look good but how do you get them into your tank?
If you fitted them before welding the tank, would they not melt during welding?

[Edited on 21/9/06 by JonBowden]

shove em down the filler neck

That's why they're small cubes rather than a large block of foam - so you can cram them into the filler neck after you welded the tank up (or as a later addition).

Thanks for the input guys

For those who are thinking on the same lines as me, here is some info:

Merlin Motorsport stock these


They cost 60p each or £32.76 for a cubic foot which equates to approx 28 litres

Demon Tweeks stock these


They cost £8.78 per gallon (not sure if they are chips or one big slab)

By my calculations that makes Merlin the better deal (by quite a margin)

[Edited on 21-9-06 by RazMan]

A few questions :

Is there a foam that can be squirted into the tank then expanding to fill the whole tank that will do the same job? I am thinking of something like the stuff that is used to make racing seats.

Assuming that there isn't such a foam, will these blocks do a better job than baffles?

Hi despite the fact that they say it dosnt break down with petrol and age it dose seem that certain addatives in modern petrol dont do it any good.
And having reasently spending a lot of time with my arm in side a large petrol tank to pull out the foam for a repair to the tank i was verry suprised to see what i saw at the bottom. And further investigation reveald that both pumps and the two filters were contaminated with particals of the stuff.
You cant beat doing the tank properly with a sump and baffels. I do realise that this is no good if you have your tank already in and then find a problem but adding a sump to the extirior of the tank is usually posiible.

cheers matt

The foam is primarily for fire retardance as it is supposed to take up the space of petrol vapour. Baffles are better in my opinion.

Is there anywhere I can get a fuel tank that is properly baffled and sumped?

I've got an MK item at the moment, which will have one baffle and has no sump. Since I'm not ready to fit it yet, where can I get something a bit better (I plan to do a bit of racing at some point, so best to get it right now for this sort of thing)?

Use a standard tank with low pressure fuel pump feeding a swirl pot, from which the HP pump, draws it's fuel, with a return from the fuel rail to the swirlpot & a return to tank for excess fuel. This is proper race car technology & this ensures no fuel starvation.
HTH
Ian

Sounds even better then! A few questions though:

Is that not just heavier due to all the additional kit?

And woould it be necessary in a BEC?

What does a low pressure pump cost/what spec?

Would the normal R1 fuel pump be enough for the higher pressure end? If not, how much/what spec?

Cheers if you can find the time to answer these, and apologies for the hijack!

does anyone know if the mass of the petrol slopping over to one side of an unbaffled tank when entering a corner affects the handling?

I intended to ask Martin Keenan, of MK Engineering, to make one for me with a sump. He is also doing my exhaust system as a one off too, at a very very reasonable price.

Tim

Apparently the blue foam only lasts for about five years - there's orange too which is lower quality.

Explosafe is a name that I remember from way back. It used to be installed in a lot of racing tanks, mainly for the fume problem but anti-sloshing is a side benefit. Does anyone know if you can still buy the stuff?

i think that the foam is easy forgotten..

also for road use you won“t pull so wmany Gees that you need to control your mass disturbtion...

saying that a seven is light in the arxx sow the 20Kg wich slamm inside the tank from one side to the other could do harm...

Tks