Compression testing

[Kb7tif]

As I have tested several other engines for compression, (and forgot)
What should a good cond stock LT-5 test at please.

[LGAFF]

185-190+

[Hog]

Wow, I would have guessed higher.

peace
Hog

[LGAFF]

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.

[Hog]

Cool, I can see there being quite the variance esp. with the cam drive system the LT-5 employs.

peace
Hog

[Paul Workman]

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.:cheers:

P.

[RedRiderZR1]

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.:cheers:

P.

My numbers are just like your sept 8, 2010 numbers last time I did a compression test.

[Hog]

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.:cheers:

P.
What was the power difference like SOTP?

peace
Hog