stas

os engine tunning does change
from start of tank to finish
should we be putting the muffler presure line
through a heat sink so it dosent heat the fuel in the tank
the car blokes seem to think it works
so what about aero

stas

ps i do run twin clunks
the old cl uni flow system
so it is bubleing in the fuel
not just blowing over the top
all ansers welcome bax

Bax

My Feedback: (11)

Unless you're running a pump or pressure system that provides consistent pressure to the carburetor, the engine's mixture will change somewhat from when the tank is full to when it's drained. Muffler pressure reduces that effect, but does not eliminate it. Usually, the engine will tend to lean as the fuel level in the tank goes down. That's because there is lower head pressure. Fuel has weight, and the more fuel above the pickup, the more pressure. This can be noticed more if you have a very large fuel tank with respect to the size of the engine. We've don't know of any adverse affects by running muffler pressure right to the fuel tank. Just make your pressure tap in the center to rear of the muffler body, and not hear the header. Adding a way to cool the exhaust before it enters the fuel tank will only add complexity and more points for difficulty.