The V8 Owners Forum -

Hi to all, new to the forum, but been lurking for some time, amazed at the amount of info and how knowledgeable people are on the Rover V8.

I`m upgrading from a standard 4.6L fitted with a Weber 500 to BV heads, larger bore manifold/exhaust and Piper 285 cam. Current fuel system is a foam filled tank with sump, Facet red top fuel pump, pressure regulator with gauge and 8mm fuel lines.

Question is, will the pump and lines be adequate for the extra fuel requirement. The car is only used for competion and trackdays so is generally at the upper end of the rev range. Many of you are serious drag strip enthusiasts so I guess you will now what is the best for the engine.

Dave

marcosman wrote:Hi to all, new to the forum, but been lurking for some time, amazed at the amount of info and how knowledgeable people are on the Rover V8.

I`m upgrading from a standard 4.6L fitted with a Weber 500 to BV heads, larger bore manifold/exhaust and Piper 285 cam. Current fuel system is a foam filled tank with sump, Facet red top fuel pump, pressure regulator with gauge and 8mm fuel lines.

Question is, will the pump and lines be adequate for the extra fuel requirement. The car is only used for competion and trackdays so is generally at the upper end of the rev range. Many of you are serious drag strip enthusiasts so I guess you will now what is the best for the engine.

Dave

i hear of people using 1/2 fuel lines, massive pumps, then regulators to stop their carbs flooding, but in a nutshell, you can't use any more fuel than your carbs needle valves will flow when the float is at the bottom, no matter how big your main jets, so if you can maintain fuel pressure when the carb is filling from empty you have enough fuel supply.

I've never actually tried it, but pull the top off the carb, dangle it over a bucket, turn your pump on and see what your pressure gauge reads as fuel pees out the needle valve.

Of course, there is the problem of pumping fuel forward from the tank against the acceleration of the car when you're giving it the berries from the start line..... A fuel pressure gauge on the fuel inlet to the carb, viewable from the drivers seat, is your friend.