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Join Date: May 2008
Location: Montreal, Canada
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how many psi for fuel in a cis k-jetrinic system?

I would like to know how many psi I should have on my system and where I can mount a test guage?. I think I have a pressure problem. my injectors dont open with fuel lines hooked up, but lines pump a lot of fuel on thier own with out the injector attached. I can open the injector needle with air at 70-80 psi of air....tried at 40 and no-go....has anyone tried this test as I would like to also know if the injectors a gunked up (the car has been sitting for a while ) here is a link to my ongoing post of starting issues

barn find 930 that wont start..help please


thanks
Old 05-23-2008, 08:35 PM
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6 Bar

6 Bar
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AMG V8 SL55 Mercedes, 993 C2, 86' Carrera 3.6 hot rod, Purple 1998 993 that didn't make the cut, 3 very old 930s, A/Fuel Dragster CH3NO2 (R.I.P.), Blown Alcohol TAD, AA/AA, 360 Maxim wingless, Cummins Turbo Diesel. Amateur Welder, Painter and sculptor sort of. -
Old 05-24-2008, 03:05 PM
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thanks e p slick.....
Is there a place that I can correctly measure the fuel pressure? at 6 bar or 87 psi, I wish to correctly calculate it at the right location. That would really help and clarify my hunch...if this is the case, I can find my problem much easier.

thanksTodd
Old 05-24-2008, 04:59 PM
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pressure

Install pressure gauge between Fuel distributer and WUR. Position gauge on/off valve on WUR side. Valve in off position shows total system pressure. Valve in open position allows fuel into the WUR and subsequent bleed off. With valve open and WUR functioing gauge reads control pressure as it is being regulated by WUR temperatures. Buy Bentely CIS book.
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AMG V8 SL55 Mercedes, 993 C2, 86' Carrera 3.6 hot rod, Purple 1998 993 that didn't make the cut, 3 very old 930s, A/Fuel Dragster CH3NO2 (R.I.P.), Blown Alcohol TAD, AA/AA, 360 Maxim wingless, Cummins Turbo Diesel. Amateur Welder, Painter and sculptor sort of. -
Old 05-24-2008, 05:35 PM
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If memory serves the cracking pressure for the injectors is something like 40 psi. The system pressure should be ~85psi.

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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 05-24-2008, 06:15 PM
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thanks that helps a lot....the picture is worth more than words...now I am sure where to go...cheers!!
Old 05-24-2008, 06:20 PM
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