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Registered
Join Date: Dec 2006
Posts: 69
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Compression Readings for 79 930
Are these compression readings normal
 My readings were: 120 psi on all cylinders (cold) 105 psi on all cylinders (hot) My 1979 930 has "sc cams" in it. |
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02-26-2007, 04:41 PM
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Registered
Join Date: Mar 2002
Posts: 3,563
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They look normal to me... a little while ago I did a cold test on my motor and it came up pretty consistent at around 110-115 psi per cylinder. My #1 cylinder was around 100-105, which got me worried a bit, but cold testing is unreliable anyway... I'll re-do it with the engine warm shortly just to verify the numbers.
Any reason why you're doing such tests? Having some performance issues?
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Merv '89 911 Turbo Cab Protomotive MAP ECU, Twin Plugged Heads, GT2-EVO CAMs, 3.3L fully finned P&C's, ARP fasteners, C2T head gaskets, Titanium Retainers, Turbo spec valves, springs & guides, 964 splash valves, GT35R BB turbo, GSF Stainless Headers, Magnaflow Exhaust, Full bay Intercooler, TiAL 46mm w/gate, TiAL 50mm BOV, Apexi AVC-R EBC, SPEC Stage3+ Clutch kit, Crane CDI Ignition 
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02-26-2007, 04:53 PM
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Join Date: Dec 2006
Posts: 69
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I do have boost problems. At around 2500 rpm. The car hesitates
on boost. The idle is rock solid. The ignition distributor is perfect wires etc. It's all new. Hoses everything. Fuses are new and fuel pumps are new! But I did notice after having my fuel distributor rebuilt. It started leaking! The person who rebuilt it didn't torque the two halves enough! I torqued it! But I wonder if that is the problem? Perhaps air is sucking in creating an air bubble? |
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02-26-2007, 05:28 PM
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