re rejetting carbs mark kromer on the thu apr gmt wibbled in an article rtaraz bigwpi ramin taraz wrote does the amount of exhaust allowed to leave the engine through the exhaust pipe make that much of a difference the amount of air fuel mixture that a cylender sucks in tries to suck in depends on the speed of the piston when it goes down and the pressure in the cylinder at the end of the exhaust stroke with a poor exhaust system this pressure may be above atmospheric with a pipe that scavenges well this may be substantially below atmospheric this effect will vary with rpm depending on the tune of the pipe some pipes combined with large valve overlap can actually reverse the intake flow and blow mixture out of the carb when outside the pipes effective rev range now my question is which one provides more resistence as far as the engine is conserned resistance that the exhaust provides or the resistance that results from the bike trying to push itself and the rider two completely different things the state of the pipe determines how much power the motor can make the load of the bike determines how much power the motor needs to make v ark fzr pilot zx payload rd mechanic you re welcome well i for one am so very glad that i have fuel injection all those needles and orifices and venturi and pressures it s worse than school human biology reproduction lessons sex always made me feel a bit queasy nick the simple minded biker dod concise oxford tube rider m lud nick pettefar contractor large currently incarcerated at bnr maidenhead the united kingdom npet bnr ca bmw k rs kay pres pbwasoh uk bs
