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02-02-2011
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#1 |
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Join Date: May 2009
Location: S Nevada
Posts: 352
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Compression testing
As I have tested several other engines for compression, (and forgot)
What should a good cond stock LT-5 test at please.
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1995 Convertible Supercharged Auto 1974 454 550hp (avatar car) On the blocks- -Scharger install ! 1992-Zr-1 Sold. Watson Headers Ported Plenum, Housings Random tech cats Fidanza Flywheel Chipped, Relocated Mat Woods 165 stat Borlas, Straights 1996 Lt4 Sold 1994 Lt1 Sold 2004 Z06 Sold AKA** Illenema |
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02-02-2011
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#2 |
 
Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Compression testing
185-190+
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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02-02-2011
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#3 |
 Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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Re: Compression testing
Wow, I would have guessed higher.
peace Hog |
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02-02-2011
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#4 |
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Join Date: Mar 2007
Location: Crystal Lake, IL
Posts: 7,194
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Re: Compression testing
My 21K mile car is about 210-215.....I was told by one of the assembly line sups that they saw values up to 300....varied from engine to engine.
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LGAFF 90 #966-150K miles-sold 92 #234-sold 1987 Callaway TT #17 1991 ZR-1 #1359 |
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02-02-2011
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#5 |
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Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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Re: Compression testing
Cool, I can see there being quite the variance esp. with the cam drive system the LT-5 employs.
peace Hog |
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02-02-2011
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#6 |
Join Date: Nov 2007
Location: Squires (near Ava MO in the Mark Twain N'tl Forest) - Missouri
Posts: 6,493
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Re: Compression testing
September 8th, 2010:
#1 = 220 #2 = 222 #3 = 220 #4 = 220 #5 = 225 #6 = 215 #7 = 230 #8 = 221 Sept 8th, 2009 (yes, exactly the year before): #1 = 180 #2 = 195 #3 = 175 #4 = 180 #5 = 175 #6 = 178 #7 = 175 #8 = 100* Both tests were conducted the same way with the same tool and with the same battery charger keeping the battery full. What was different is in the interim I ported the heads and a valve job was done in addition to replacing an exhaust valve in #8...AND after Pete timed the cams. Because of the fresh valve job AND re-timing the cams took place, it's not possible to say just what made the difference. But, there you have two sets of data from the same motor to ponder.  P.
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Good carz, good food, good friendz = the best of timez! 90 #1202 "FBI" top end ported & relieved Cam timing by "Pete the Greek" Sans secondaries Chip & dyno tuning by Haibeck Automotive SW headers, X-pipe, MF muffs Former Secretary, ZR-1 Net Registry |
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02-05-2011
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#7 | |
 
Join Date: Jun 2005
Location: Orange County, California
Posts: 75
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Re: Compression testing
Quote:
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1990 Bright Red ZR1 #41 ZR-1 Net Registry Founding Member #415 |
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02-07-2011
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#8 | |
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Join Date: Jul 2010
Location: Woodstock, Ontario, Canada
Posts: 1,275
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Re: Compression testing
Quote:
peace Hog |
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