![]() ![]() ![]() This prevents washing of the cylinder walls and longevity of your motor.Īt idle the vacuum can NEVER drop below the value on the power valve or the motor is flooded with fuel causing fouled plugs and stalling.Ĭrusing jetting is a combination of idle circuit, yes it feeds the engine all the time, the transfer slots and the main jets. You want to run lean for good gas mileage and a clean running motor. Immediately after passing and resuming light load cruising the mixture goes back to the 15-1. While cruising under light load you fuel ratio sits at the 15 or so you jetted for but passing, even under moderate throttle or going up a hill the vacuum drops slightly below the power valve value and the power valve opens richening the mixture and in my case using the stock drilled metering block it drops to 13-1. You would select a power valve just 1 1/2 or 2 points below this or a 6 or 6.5 in this case. You monitor the average light load cruising vacuum and say it is 8 for lack of a number. I like my plugs white while cruising under light load. The range of modern cars with fuel injection. I jet my carbs lean using a fuel ratio gage to about 15-1. The number on the side of the power valve is the value in inches of vacuum where the valve opens. It is held open by a spring and vacuum holds it closed. When open the hole in the metering plate meters the actual fuel. How does the power valve work and how do you tune it? ![]()
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