The O2 sensors are one wire non-heated, and the gages are Autometer with the led lights. The engine has 2 chamber Flowmasters mounted to the collectors, and then it feeds a pair of big RV mufflers ( keeps the neighbors off my stink) ,then vents out side the shop. All the pipes are 3”
When I remove the vacuum to the PV and it opens it has no effect on the A/F gage. The gage reads the same at idle weather the PV is open or closed. IMO this is correct since the PV feeds the main circuit and not the idle circuit. The idle circuit gets its fuel through the restriction at the bottom of the main well. I would not think that by adding any more fuel to the main well, the restriction could allow more fuel through??? My test proved that to me…
David Redszus wrote:Which O2 sensor or you using?
What reading do you get when under full load?
Motor Daddy wrote:...I can go up a hill and watch the vacuum gauge drop slowly, and when the gauge reads below my power valve rating of 6.5, the A/F ratio changes about a full point from 13.8-12.8..]