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Tech Talk Technical Discussion About The Nissan 240SX and Nissan Z Cars |
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02-25-2012, 02:34 PM | #32 |
Leaky Injector
Join Date: Nov 2010
Location: colorado
Age: 35
Posts: 124
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im sure its coming from the cylinder im testing. its random and only will pop once when im cranking. it doesnt pop every time though. it might be from the tester i hope. its hard to tell when im doing a one man job
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02-25-2012, 06:43 PM | #33 |
Man w/ CTSV & a Car Seat
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Is the tester sealing properly? Either its not seated properly or its popping due to a faulty check valve.
I usually just let the engine do 5 compression cycle to test, doesnt really jump much after that. Just look at the needle, watch it jump and just count the cycles that way instead of trying to listen to the engine. |
02-27-2012, 12:29 PM | #36 |
Leaky Injector
Join Date: Nov 2010
Location: colorado
Age: 35
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ok so my compression is low and i was planning on boosting so i decided i should do a rebuild before boosting. is there a good rebuilt kit you guys would recommend
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02-27-2012, 11:31 PM | #39 |
Zilvia Junkie
Join Date: Aug 2011
Location: SoCal / High Desert
Posts: 543
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I ran 10 pounds on my stock engine with no problems. Rings gave out but I think it was more due to a tired engine.
Now I'm going forged bottom end so high boost won't be an issue. But it takes money. So far I'm 800 into the block in parts and no machine work yet lol. |
02-29-2012, 12:37 PM | #42 |
Nissanaholic!
Join Date: Nov 2004
Location: Alberta, Red Derp
Age: 43
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When it comes to compression testing, its more important to have all 4 cylinders close to each other then it is to have the actual numbers higher or lower.
...usually. If you wish to turbo the KA, I'd get a stand alone instead of doing a hack job tune with oversize injectors. That is just me. I guess its all about budget. I originally wanted to do a 300hp KA-T, but ended up beefing up everything, now I have a $6000 project that hopefully will net me 500hp.
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KA-T ORG-Function over Flush |
02-29-2012, 01:23 PM | #43 |
Zilvia Junkie
Join Date: Aug 2011
Location: SoCal / High Desert
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When I did my compression test the cylinders were all within the allowable limits of difference between cylinders, however my results were well below the service limit. So it is just as if not more important to have the right numbers.
I feel you on the goals. I started with just a T25 kit and now Im fully invested in a forged build. Youd be surprised what low compression will do to your budget lol. |
02-29-2012, 04:29 PM | #45 |
Nissanaholic!
Join Date: Nov 2004
Location: Alberta, Red Derp
Age: 43
Posts: 1,729
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Rarely do all 4 cylinders drop compression at the same time. You can fix it however you want, just saying that usually if there is problems, its usually just one cylinder.
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KA-T ORG-Function over Flush |
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