A back pressure gauge can be connected to the exhaust system one of several ways. By removing the oxygen sensor and connecting the gauge to the hole in the exhaust manifold by removing the air check valve in the air pump or plus air system, However on this design it is install on the pipe by drilling a hole just ahead of the butterfly to attach the gauge.
On the rear end of the straight pipe, a (orifice) 2.1 cm or 0.021mmwasher is weld inside the diameter of the exhaust pipe in addition with two tiny 3mm tubes. The pressure one is measured by the tube that is fitted just ahead of the washer or orifice while pressure two is measured by the second tube which is located just after the air flow is restricted by the orifice.
On the rear end of the straight pipe, a (orifice) 2.1 cm or 0.021mmwasher is weld inside the diameter of the exhaust pipe in addition with two tiny 3mm tubes. The pressure one is measured by the tube that is fitted just ahead of the washer or orifice while pressure two is measured by the second tube which is located just after the air flow is restricted by the orifice.
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