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Registered
Join Date: May 2008
Posts: 730
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CIS system pressure
Car in question '74 911.
CIS system pressure per spec is 4.5 to 5.2 bar with a adjusting spec of 4.7 to 4.9 bar, mine checks at 5.1 bar. Is it preferred that the pressure be to the upper or lower of that spec or right in the middle? |
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01-21-2011, 03:55 PM
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Registered
Join Date: Oct 2008
Location: Nash County, NC.
Posts: 8,524
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The important thing is that the pressure falls into the graph for your year. The control pressure through the warm up regulator tested with guages to the spec that is called for in the factory graph having to do with outside temperature and pressure.
Bruce |
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01-21-2011, 04:25 PM
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Registered
Join Date: May 2008
Posts: 730
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That all looks good, here are the results:
Cold 1.9 bar at 18C Warm idle 3.1 bar spec 2.9 - 3.1 half throttle 3.5 bar spec 3.5 - 3.9 full throttle 3.1 bar spec 2.7 - 3.1 the idle and full are at the top of value from small tech book. This car has the control pressure regulator, throttle valve position, I adjusted the idle down to 2.95 bar and this is as low as the valve will turn, and the full position is still at 3.1 bar. One problem with the car is in cold weather at a low rpm around 2000 the car will at times start to buck. I've come to believe that this is a characteristic of the early CIS. |
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01-21-2011, 04:58 PM
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