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#1
07-12-2005, 07:40 PM
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Good or bad compression?
Hey guys, I have a question regarding my compression test today. Here's the results.
Piston 1: 140psi Piston 2: 140psi Piston 3: 155psi Piston 4: 155psi I did the test thinking i blew a headgasket. It was blowing white smoke(antifreeze?) out the tail pipe for about 10 minutes as I was driving, then it quit after I let it sit, and hasn't done it since. But these numbers are too high i would think to be a headgasket. My question is the jump between pistons 1,2 and pistons 3,4. Is this a bad thing? 15 psi? And aren't adjacent pistons usually different, instead of the same in this case. The car just rolled over 150,000 on stock internals. Give me some feedback!
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1990 Eagle Talon TSI AWD MOD LIST: ______________________ Mitsubishi s16g, Turboback 2 1/2 in. w/ Hi-Flow Cat, ACT 2600 Clutch, K&N Filter, Taylor 10.5 mm Spark Plug Wires, BPR7ES Plugs, Dejon Tool UICP, Turbo XS Type H BOV, Samborskey Shift Kit, Walbro 255lph, Injector Clinic 550's, 2g mas, Vaccum line elimination, SAFC II, Pocketlogger, 17" Motegi Gloss Black Rims, VIS Carbon Fiber Hood, Eibach Lowering Springs, KYB AGX, Homemade boost controller, Autometer Boost/Air Fuel 
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#2
07-13-2005, 09:57 AM
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No comment... anyone?
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1990 Eagle Talon TSI AWD MOD LIST: ______________________ Mitsubishi s16g, Turboback 2 1/2 in. w/ Hi-Flow Cat, ACT 2600 Clutch, K&N Filter, Taylor 10.5 mm Spark Plug Wires, BPR7ES Plugs, Dejon Tool UICP, Turbo XS Type H BOV, Samborskey Shift Kit, Walbro 255lph, Injector Clinic 550's, 2g mas, Vaccum line elimination, SAFC II, Pocketlogger, 17" Motegi Gloss Black Rims, VIS Carbon Fiber Hood, Eibach Lowering Springs, KYB AGX, Homemade boost controller, Autometer Boost/Air Fuel
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#3
07-13-2005, 12:40 PM
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Re: Good or bad compression?
anything below 145 psi is what mitsubishi calls the "service mark" it might be time for a re-build anyways.
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95 Talon TSI AWD 97 Eclipse GST 
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#4
07-13-2005, 01:35 PM
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Are you kidding? That compression is awesome, it's the difference between the cylinders that i'm concerned about. And service limit is 121.
__________________
1990 Eagle Talon TSI AWD MOD LIST: ______________________ Mitsubishi s16g, Turboback 2 1/2 in. w/ Hi-Flow Cat, ACT 2600 Clutch, K&N Filter, Taylor 10.5 mm Spark Plug Wires, BPR7ES Plugs, Dejon Tool UICP, Turbo XS Type H BOV, Samborskey Shift Kit, Walbro 255lph, Injector Clinic 550's, 2g mas, Vaccum line elimination, SAFC II, Pocketlogger, 17" Motegi Gloss Black Rims, VIS Carbon Fiber Hood, Eibach Lowering Springs, KYB AGX, Homemade boost controller, Autometer Boost/Air Fuel
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#5
07-13-2005, 04:10 PM
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Re: Good or bad compression?
isn't the best possible compression around 180?
140-155 doesn't sound that bad to me... Just a side question for tsipsi20.... How did you do your compression test? You will get different results if the engine is warm and if it is cold... just thought i'd ask...
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"A man's greatest work is to break his enemies, to drive them before him, to take from them all the things that have been theirs." -Ghengis Khan
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#6
07-13-2005, 06:56 PM
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service is 121
standard is 160
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1990 MIRAGE HB 4G SWAP FMIC ACT 2100 TIAL BOV TIAL WASTEGATE FIC 650"s SX AFR MAFT INNOVATIVE DUEL BB TURBO TURBONETICS MANIFOLD 255 PUMP WISECO 8:51 EAGLE RODS DELTA 272 CAMS SETRAB OIL COOLER AEROMOTIVE STARLITE HOSE AUTOMETER ROTA CIRCUT 8"S
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#7
07-13-2005, 07:12 PM
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This is a snapshot taken from Mitchell1
 This shows the minimum compression, did a full search on Mitchell1 and it does not show the recommended compression. From the looks of it, 6-bolt turbo minimum compression is 114psi, while the 7-bolt turbo minimum compression is 121psi.
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1993 Eagle Talon ES (4g63NA) 14.6 @ 98 mph (110 octane race fuel) -5 Speed Transmission (From a 4g67) -Stage 2 Crane cams -Ported and polished head -Aggresive valve springs -2.5" Custom made exhaust piping -Custom header -Gutted catalytic converter -Bored 0.5mm -Advanced ignition timing (CAS) aprox. 5 degrees (set @ ~10deg BTDC) -2g valve lifters (Lifter noise returned, now it a true DSM) -K&N w/modified air canister Last edited by macder; 07-13-2005 at 08:37 PM.
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#9
07-14-2005, 03:02 PM
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I actually just did the seafoam thing about a month ago. Fed it through the vaccum line from the BOV to the intake manifold. I've changed the oil and filter since, so I doubt it was smoking because of the seafoam.
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1990 Eagle Talon TSI AWD MOD LIST: ______________________ Mitsubishi s16g, Turboback 2 1/2 in. w/ Hi-Flow Cat, ACT 2600 Clutch, K&N Filter, Taylor 10.5 mm Spark Plug Wires, BPR7ES Plugs, Dejon Tool UICP, Turbo XS Type H BOV, Samborskey Shift Kit, Walbro 255lph, Injector Clinic 550's, 2g mas, Vaccum line elimination, SAFC II, Pocketlogger, 17" Motegi Gloss Black Rims, VIS Carbon Fiber Hood, Eibach Lowering Springs, KYB AGX, Homemade boost controller, Autometer Boost/Air Fuel
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#10
07-14-2005, 03:05 PM
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Oh and I tested it with the engine at nearly operating temperature, with the TB wide open. It was a dry test though, i didn't see the need to pour any oil down the spark plug holes to test the rings because the compression was already high enough in my opinion. The first compression stroke shot to about 70 psi, so i doubt the ring is the problem.
__________________
1990 Eagle Talon TSI AWD MOD LIST: ______________________ Mitsubishi s16g, Turboback 2 1/2 in. w/ Hi-Flow Cat, ACT 2600 Clutch, K&N Filter, Taylor 10.5 mm Spark Plug Wires, BPR7ES Plugs, Dejon Tool UICP, Turbo XS Type H BOV, Samborskey Shift Kit, Walbro 255lph, Injector Clinic 550's, 2g mas, Vaccum line elimination, SAFC II, Pocketlogger, 17" Motegi Gloss Black Rims, VIS Carbon Fiber Hood, Eibach Lowering Springs, KYB AGX, Homemade boost controller, Autometer Boost/Air Fuel
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#12
07-14-2005, 09:56 PM
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Re: Good or bad compression?
good, i was about to post a thread similar to this one....i ran a compression test on my car today. had a buddy help me do it. my compression reads 145 for all 4 cylinders...do i have a problem here or what? i thought i should be somewhere around 175 or so. at least i'm not around 120. any help would be great.
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#13
07-15-2005, 01:03 AM
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That's damn good compression. Especially since it's consistent in all 4 cylinders, unlike my test. Standard compression is 164 psi, with the service limit being 121. You're on the better end of the spectrum, I'd take that anyday!
__________________
1990 Eagle Talon TSI AWD MOD LIST: ______________________ Mitsubishi s16g, Turboback 2 1/2 in. w/ Hi-Flow Cat, ACT 2600 Clutch, K&N Filter, Taylor 10.5 mm Spark Plug Wires, BPR7ES Plugs, Dejon Tool UICP, Turbo XS Type H BOV, Samborskey Shift Kit, Walbro 255lph, Injector Clinic 550's, 2g mas, Vaccum line elimination, SAFC II, Pocketlogger, 17" Motegi Gloss Black Rims, VIS Carbon Fiber Hood, Eibach Lowering Springs, KYB AGX, Homemade boost controller, Autometer Boost/Air Fuel
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#14
07-15-2005, 03:13 PM
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Re: Good or bad compression?
Quote:
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1993 Eagle Talon ES (4g63NA) 14.6 @ 98 mph (110 octane race fuel) -5 Speed Transmission (From a 4g67) -Stage 2 Crane cams -Ported and polished head -Aggresive valve springs -2.5" Custom made exhaust piping -Custom header -Gutted catalytic converter -Bored 0.5mm -Advanced ignition timing (CAS) aprox. 5 degrees (set @ ~10deg BTDC) -2g valve lifters (Lifter noise returned, now it a true DSM) -K&N w/modified air canister
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#15
07-15-2005, 09:12 PM
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Yes, my bad, thanks!
__________________
1990 Eagle Talon TSI AWD MOD LIST: ______________________ Mitsubishi s16g, Turboback 2 1/2 in. w/ Hi-Flow Cat, ACT 2600 Clutch, K&N Filter, Taylor 10.5 mm Spark Plug Wires, BPR7ES Plugs, Dejon Tool UICP, Turbo XS Type H BOV, Samborskey Shift Kit, Walbro 255lph, Injector Clinic 550's, 2g mas, Vaccum line elimination, SAFC II, Pocketlogger, 17" Motegi Gloss Black Rims, VIS Carbon Fiber Hood, Eibach Lowering Springs, KYB AGX, Homemade boost controller, Autometer Boost/Air Fuel
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