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Macht Schnell
 
les_garten's Avatar
 
Join Date: Jun 2003
Location: PSL, FL
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Compression test

Hi,
On a 7:1 CR 930 Motor. What should my cold Compression test be on each cylinder?

Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 01-13-2008, 11:52 AM
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Anywhere between 115-130psi I believe... you should never do a compression test on a cold motor anyway.
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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
Old 01-13-2008, 02:07 PM
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Macht Schnell
 
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Join Date: Jun 2003
Location: PSL, FL
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Quote:
Originally Posted by WydRyd View Post
Anywhere between 115-130psi I believe... you should never do a compression test on a cold motor anyway.
Hi,
Wasn't the ideal situation. I was checking some issues to make sure I didn't have a bent valve and did a compression check. Please don't tell the Porsche God's I did a cold compression test! I won't do it again ;-) They all came up dead on 120 #. So that and a valve lash check suggest to me I'm OK for now. I also was worried that my rings had never seated from a rebuild, and the CR test made me feel better about that also.

Les
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---Les Garten---85 930, Andial IC, GHL Headers, Fabspeed Dual, K-27 HF2, 3.4 JE Full Finned 7.5:1 CR, 964 CAM'd, Carerra 3.2 Manifold Cut/Flipped, Tec3r, Siemans 55#, GSF Fuel Rails, Clewett Crank Trigger, Clewett Cam Trigger,Dual Plugged, ARP Head Studs/Rod Bolts, Clewett Wires.Tial 46mm WG, Tial 50mm BOV, WEVO Shifter,934 Boost Gauge, Wideband EGO Sensor/Gauge, C2T Head Gaskets, '88 MB 300TE,BMW R100RT
Old 01-13-2008, 03:05 PM
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LOL! No probs, your secret is safe with me

More important than the exact reading on each cyl is the variation between cyl's. They all should be very close to one another. Any cylinder that has a significantly different reading from the others should be investigated further with a leakdown test.

Since yours is all ~120psi, you're in the green
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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
Old 01-13-2008, 03:10 PM
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