Surge tank questions??

[muaythailuke]

Hi,

im about to install a larger fuel pump(bosch 044) into my R33 GTS-t, but now thinking of installing a surge tank also.

Would the standard fuel pump have enough flow to the surge tank to keep it suficiantly full in order to keep up with the larger bosch item?

Thanks

[JimX]

It should be ok, but keep in mind that the 044 will be mega loud if put in a surge tank. Depending on your power requirements you might want to consider something a little smaller/quieter.

[Sydneykid]

Hi guys, I wrote this for another post but I think it makes sense here...

A Bosch 044 pump is rated for around 200 litres per hour at 73.5 psi (40 psi fuel pressure plus 33.5 psi boost). If it is not pumping against pressure (ie; into a surge tank) it flows around 330 litres per hour.

The #1 purpose of a surge tank is to remove the possibility of fuel starvation due to centrifugal force moving the petrol in the main fuel tank away from the pick up (ie; under acceleration, braking or cornering). It also has a #2 purpose, to act as a reservoir for fuel to supply the main (engine supplying) fuel pumps.

If you have a 2 litre surge tank full, that is enough to supply 2 X 200 litre pumps for 18 seconds even if the lift pump (in the tank) isn't working.

400 / 60 / 60 = 0.11 litres per second

So 2 litres = 18 seconds

But of course the lift pump is still working (at 330 litres) so the surge tank is only going down at 400 - 330 = 70 litres per hour. That's 0.02 litres per second, so it would take 100 seconds for the surge tank to empty.

I don't know about you, but I can't drive my Skyline, if it had an engine needing 400 litres per hour (enough for >1,200 bhp), for 100 seconds without lifting the throttle.

Hope that helps

[muaythailuke]

thanks SydneyKid