Compression Test Results

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Compression Test Results
Topic Started: May 31 2010, 07:29 PM (320 Views)
illmatic	May 31 2010, 07:29 PM Post #1
CunningLynguist Posts: 515 Group: Members Member #91 Joined: May 31, 2009 My Ride: '90 S13 hatch	i just finished up my compression test, i was kinda procrastinating before -___- cylinder 1: 155 cylinder 2: 155 cylinder 3: 135 cylinder 4: 135 i wasnt expecting those results....fuck!!



Deleted User	May 31 2010, 07:56 PM Post #2
Deleted User	REBUILD!
Deleted User


illmatic	May 31 2010, 07:58 PM Post #3
CunningLynguist Posts: 515 Group: Members Member #91 Joined: May 31, 2009 My Ride: '90 S13 hatch	89S13 May 31 2010, 07:56 PM REBUILD! idkk man..would it be worth it? i dont have another car to use in the meantime



Deleted User	May 31 2010, 08:00 PM Post #4
Deleted User	illmatic May 31 2010, 07:58 PM 89S13 May 31 2010, 07:56 PM REBUILD! idkk man..would it be worth it? i dont have another car to use in the meantime compression results are supposed to be +/- 3 points per cylinder. youre way off, i would recommend and highly encourage a rebuild. but if you cant afford to do that, then my next suggestion would be look into picking up a good condition shortblock and swap everything in a weekend.
Deleted User


illmatic	May 31 2010, 08:03 PM Post #5
CunningLynguist Posts: 515 Group: Members Member #91 Joined: May 31, 2009 My Ride: '90 S13 hatch	89S13 May 31 2010, 08:00 PM illmatic May 31 2010, 07:58 PM 89S13 May 31 2010, 07:56 PM REBUILD! idkk man..would it be worth it? i dont have another car to use in the meantime compression results are supposed to be +/- 3 points per cylinder. youre way off, i would recommend and highly encourage a rebuild. but if you cant afford to do that, then my next suggestion would be look into picking up a good condition shortblock and swap everything in a weekend. there was an issue with the 3rd cylinder, when i pulled the spark plug out there was a piece of metal stuck inbetween the threads and the plug itself looked like it had been cross threaded. it was bit of a pain to actually get the adapter to thread in properly...i was able to wiggle it slightly when it had been tightened down...



omgshawn	May 31 2010, 08:04 PM Post #6
Posts: 838 Group: Members Member #219 Joined: October 7, 2009 Location: Toms River My Ride: s13, eg hatch	Just asking...are you sure you did the compression test right? I would make sure of that first before tearing it apart.



Deleted User	May 31 2010, 08:07 PM Post #7
Deleted User	illmatic May 31 2010, 08:03 PM 89S13 May 31 2010, 08:00 PM illmatic May 31 2010, 07:58 PM 89S13 May 31 2010, 07:56 PM REBUILD! idkk man..would it be worth it? i dont have another car to use in the meantime compression results are supposed to be +/- 3 points per cylinder. youre way off, i would recommend and highly encourage a rebuild. but if you cant afford to do that, then my next suggestion would be look into picking up a good condition shortblock and swap everything in a weekend. there was an issue with the 3rd cylinder, when i pulled the spark plug out there was a piece of metal stuck inbetween the threads and the plug itself looked like it had been cross threaded. it was bit of a pain to actually get the adapter to thread in properly...i was able to wiggle it slightly when it had been tightened down... hmmmm ill agree with what shawn just posted. go back and recheck 3 and 4, make sure you did everything right. a 20 point loss is quite exponential. and that is definitely something you would notice while doing the test. recheck and while youre at it, do a cylinder leak down test too, if your compression numbers are low after rechecking the CLT will let you know if its valves or rings.
Deleted User


illmatic	May 31 2010, 08:07 PM Post #8
CunningLynguist Posts: 515 Group: Members Member #91 Joined: May 31, 2009 My Ride: '90 S13 hatch	omgshawn May 31 2010, 08:04 PM Just asking...are you sure you did the compression test right? I would make sure of that first before tearing it apart. i disconnected the wires, grounded the distributor side coil wire to the neg terminal on the battery with a jumper lead, screwed in adapter with the hose and gauge, and held open the throttle plate while my buddy/brother cranked the motor about 5 times as i read the gauge...i mess up somewhere?



Deleted User	May 31 2010, 08:07 PM Post #9
Deleted User	illmatic May 31 2010, 08:07 PM omgshawn May 31 2010, 08:04 PM Just asking...are you sure you did the compression test right? I would make sure of that first before tearing it apart. i disconnected the wires, grounded the distributor side coil wire to the neg terminal on the battery with a jumper lead, screwed in adapter with the hose and gauge, and held open the throttle plate while my buddy/brother cranked the motor about 5 times as i read the gauge...i mess up somewhere? did ya have a charger on the battery? and whyd you even ground the coil wire? i would have just unhooked the coil all together
Deleted User


illmatic	May 31 2010, 08:10 PM Post #10
CunningLynguist Posts: 515 Group: Members Member #91 Joined: May 31, 2009 My Ride: '90 S13 hatch	89S13 May 31 2010, 08:07 PM illmatic May 31 2010, 08:07 PM omgshawn May 31 2010, 08:04 PM Just asking...are you sure you did the compression test right? I would make sure of that first before tearing it apart. i disconnected the wires, grounded the distributor side coil wire to the neg terminal on the battery with a jumper lead, screwed in adapter with the hose and gauge, and held open the throttle plate while my buddy/brother cranked the motor about 5 times as i read the gauge...i mess up somewhere? did ya have a charger on the battery? and whyd you even ground the coil wire? i would have just unhooked the coil all together i was following the instructions that came along with the kit. it does seem odd that the two last cylinders were so off...the fact that the gauge wasnt threading in properly each time i performed the test on the third cylinder is buggin me though...with the first two cylinders it went in just fine..



Deleted User	May 31 2010, 08:12 PM Post #11
Deleted User	yea that was probably part of the problem. clean the threads out on 3 (and 4 if necessary, keep sure you dont drop anything into the combustion chamber) and recheck.
Deleted User


illmatic	May 31 2010, 08:17 PM Post #12
CunningLynguist Posts: 515 Group: Members Member #91 Joined: May 31, 2009 My Ride: '90 S13 hatch	89S13 May 31 2010, 08:12 PM yea that was probably part of the problem. clean the threads out on 3 (and 4 if necessary, keep sure you dont drop anything into the combustion chamber) and recheck. yeaahh i guess i should try cleaning them again...anything in particular i should be using to clean em out?



Deleted User	May 31 2010, 08:27 PM Post #13
Deleted User	i cant think of anything off the top of my head, you may want to just pull the head off so that way you dont get anything in the combustion chamber.
Deleted User


illmatic	May 31 2010, 08:31 PM Post #14
CunningLynguist Posts: 515 Group: Members Member #91 Joined: May 31, 2009 My Ride: '90 S13 hatch	89S13 May 31 2010, 08:27 PM i cant think of anything off the top of my head, you may want to just pull the head off so that way you dont get anything in the combustion chamber. i hear ya...i legit think the thread on the head is fucked up. like putting the plug back in was retarded, i almost had to force it, which would have made matters worse..



omgshawn	May 31 2010, 08:47 PM Post #15
Posts: 838 Group: Members Member #219 Joined: October 7, 2009 Location: Toms River My Ride: s13, eg hatch	Try to helicoil it, and yes pull the head off first



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