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case pressure myths
Sam,
Now I understand. If the pressure control valve and bleed orifice let the case pressure get too high, the lift pump will take too much power to drive, making the IP inefficient. If they let the case pressure go too low, the pressure pump may not be able to fill completely, which could limit maximum power, and could cause cavitation damage within the pressure pump. There is no connection to injection timing. That is set by the cam position (I like mine at 0.038"), and the cold start device, which can advance the injection timing by 2.5 degrees.
So, measuring and adjusting the case pressure to the low limit could improve MPGs. Does your document address adjusting case pressure, and give limits?
This reminds me that I was thinking of installing an exhaust gas temperature gauge and while driving at a constant speed on level ground, see if an optimum advance over the 0.038" setting could be seen within the range of the cold start device.
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