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07-17-2021, 05:06 PM
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#1 |
    
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Cranking compression variances
So, during my trip to Camaro Fest, I felt the car was down on power a little bit. I drove it back home and let it sit for a few days before I got around to looking at it.
Today, I performed a compression check and got the following readings: CYL #1 = 190psi CYL #2 = 175psi CYL #3 = 200psi CYL #4 = 185psi CYL #5 = 175psi CYL #6 = 175psi CYL #7 = 170psi CYL #8 = 200psi Engine specs are: Stock rotating assembly (4.065" x 3.622") Custom Cam (227/243 115LSA 110 ICL) ported & decked stock heads (can't remember how much was cut, maybe .020") LS9 head gaskets Using some online calculators (using stock chamber volume, 70cc), the calculator indicated I should have around 190psi gauge pressure, with about 210psi actual cranking pressure. Other than 'feeling' down on power, the car doesn't exhibit any symptoms, i.e. doesn't smoke, consume oil, run hot, etc. What do you guys think? -Scott
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745RWHP/634RWTQ on 93 @ 10psi
806/676 on E85 @ 10psi  COTW 9/8/14 |
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07-17-2021, 05:44 PM
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#2 |
Drives: 2011ss/rs camaro Join Date: Sep 2011
Location: florida
Posts: 1,261
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Let me borrow it for about a week and give you my opinion…lol
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 . OBX LTH,Rotofab,Magnuson Heartbeat.AEM wideband, HP Tuners |
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07-17-2021, 06:09 PM
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#3 |
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Only if you fix it, LOL
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745RWHP/634RWTQ on 93 @ 10psi
806/676 on E85 @ 10psi COTW 9/8/14 |
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07-17-2021, 06:48 PM
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#4 |
       
Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,019
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Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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07-17-2021, 06:51 PM
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#5 |
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Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,019
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Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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07-17-2021, 06:52 PM
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#6 |
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Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,019
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__________________
Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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07-17-2021, 07:39 PM
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#7 |
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Thanks Bo White, appreciate the info. It's been blown for almost 70K miles as well. Guess I'll just go ahead and keep sending it until.......
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745RWHP/634RWTQ on 93 @ 10psi
806/676 on E85 @ 10psi COTW 9/8/14 |
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07-18-2021, 01:35 AM
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#8 |
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Drives: 2015 Summit White 2SS 1LE Join Date: Feb 2012
Location: Vance Alabama
Posts: 8,019
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Send it brotha
__________________
Retired wanna be cylinder head porter
2015 2SS 1LE Clutch reservoir, Vararam DRX, ported TB, TSP 2" headers, MGW shifter Totalled: 2010 1SS Wilkes Performance/Eagle 416 shortblock, TSP custom valvetrain, PRC 260 heads, Edelbrock Pro Flo 102, th400 swap, 8" PTC 5500 stall= 535/435 at the wheels tuned Gen 3 Performance and Dyno 10.97 @ 124 full weight in 3100 DA CamaroFest X |
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