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05-07-2022, 09:00 AM
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#1 |
 Drives: 2017 Camaro ZL1 A10 Join Date: Jan 2017
Location: Washington State
Posts: 83
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Compression test result
I had a compression test done on my 2017 ZL1 (24K miles) after a cam install just to check it. I'm trying to find what the expected values are and I'm not finding anything, I also looked through the service manual.
Does anyone know what the expected values are for our engines? Here are my results:
Average : 167 #6 is the lowest but still within 10% of the others. GM allows 30%.
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2017 ZL1 Black, A10
Build: Magnuson 2650R, 103NW Throttle Body, Rotofab Big Gulp, Kooks 2" headers, Catless, AWE Touring exhaust, JRE Smooth Idle Cam, Katech Oil Pump, Elite Catch Can, JMS Fuel Booster |
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05-07-2022, 09:11 AM
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#2 |
     Drives: 2017 Camaro 1SS Join Date: Aug 2016
Location: NH
Posts: 1,692
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Problem with comparing to other's cranking numbers is that you've changed the camshaft. Bigger cam is going to cause a lower cranking compression number than you would have seen while the stock camshaft was still in there.
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05-07-2022, 10:04 AM
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#3 | |
    
Drives: '20 ZLE Join Date: Jun 2020
Location: Mile High
Posts: 3,558
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I've threatened to test mine but have thus far procrastinated.
Quote:
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'20 ZL1 1LE A10,
OEM short block, LME heads/valve train, E2650. 100+ octanes, no eth, no meth, no N2O. 2/23 - 1031/1004 wheel. 4/23 - 1.41/9.61/145 at DA 7000 ft. (only made five passes). 2/24 - LME 390, E2650, FBO, 100 oct.; 1116hp/ 1063tq; 109 oct. dyno next. |
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05-07-2022, 05:04 PM
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#4 |
Drives: 2022 Lt1 A10 Join Date: Nov 2015
Location: clark, mo
Posts: 8,860
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Your right on the money for an Lt4 with 10 compression ratio. The Lt1's generally are 200 to 210 or maybe a little higher with a 11.5 compression ratio. To me what's most important is the tightness of the cylinders, 167 to 170 is just stellar. Your good to go
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2022 Lt1 6.2 A10, Maggie 2300, THPSI Port Inj/10 rib, Rotofab, E, Nickey, SCOL, Griptech, RC Bandits, Hoosiers/MT 9.80@142.96 1.44 60ft, 6.34@112 707/669 RWHP/TRQ. 16SS Maggie 2650 9.41@147 1.35 60ft, 5.99@119. 16 C7 A8 10.90@128 Bolt on stuff
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05-07-2022, 08:48 PM
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#5 |
 
Drives: '21 ZLE A10 Join Date: May 2012
Location: Mechanicsville, VA
Posts: 6,808
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looks good...old school trick is to put a squirt of oil in the lowest cylinder and see if the compression increases significantly. The spread is reasonable and the new cam's overlap (intake and exhaust open at the same time) will lower cranking compression
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'21 ZLE A10 Wild Cherry PDR 2:00.78 VIR Full 10.68@131.69 1.68 60'
'17 ZL1 A10 Mosaic Black PDR/Nav 2:03.08 VIR Full 11.003@129.2 1.75 (sold) '15 Z/28 #325 Black a/c & stereo. 2:10.1 VIR Full (sold) '12 ZL1 A6 Black 10.52@131 1.55 60' 2:13 VIR Full (sold) |
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05-08-2022, 10:31 AM
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#6 | |
Drives: like an old lady Join Date: Jun 2012
Location: indiana
Posts: 2,395
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Quote:
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2016+ camaro: everyone’s first car
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05-08-2022, 02:29 PM
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#7 |
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Drives: 2018 Camaro SS 1LE Join Date: Jul 2018
Location: Stuttgart, Germany
Posts: 807
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265 psi??? Is this a quality gauge?
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05-08-2022, 03:29 PM
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#8 | |
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Drives: like an old lady Join Date: Jun 2012
Location: indiana
Posts: 2,395
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Quote:
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2016+ camaro: everyone’s first car
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