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88 351w compression results
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88 351w compression results
after i got a new compression gauge, i finally got some numbers that look ok i think
#1 - 145
#2 - 145
#3 - 147
#4 - 175
#5 - 176
#6 - 146
#7 - 145
#8 - 146
y would 4 and 5 be that much higher or why would the others be that low or is everything ok?
#1 - 145
#2 - 145
#3 - 147
#4 - 175
#5 - 176
#6 - 146
#7 - 145
#8 - 146
y would 4 and 5 be that much higher or why would the others be that low or is everything ok?
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Joined: Oct 2010
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i have never seen 6 cylinders that are low and exactly the same, and the other 2 higher but exactly the same. what would cause EVEN compression loss on 3 cylinders per side?
have any body heard of a "wet or dry" test? You can do the test wet and dry. Check the lbs. dry and then give a little shot of oil in the plug hole and check the lbs. If the pressure goes up wet, then the rings are losing the pressure. If the pressure is the same wet or dry, then it's a good chance that it needs a valve job
have any body heard of a "wet or dry" test? You can do the test wet and dry. Check the lbs. dry and then give a little shot of oil in the plug hole and check the lbs. If the pressure goes up wet, then the rings are losing the pressure. If the pressure is the same wet or dry, then it's a good chance that it needs a valve job
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Senior User
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never hear of that till i researched. i will try this later today. the intake manifold is off the truck so it can not run. how bad is it to do a compression test on a cold motor? and how much oil should i put in the cylinder?
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Senior User
Joined: Oct 2010
Posts: 126
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alright. finally got to work on the truck. did a compression test dry and wet one some. here results
#1 - 155 d
#2 - 160 d
#3 - 140 d, 140 w
#4 - 180 d
#5 - 179 d
#6 - 155 d, 155 w
#7 - 130 d, 130 w
#8 - 156
well there are some numbers that are too low and didnt change when i did a wet test. So, hopefully it is in the valves.
#1 - 155 d
#2 - 160 d
#3 - 140 d, 140 w
#4 - 180 d
#5 - 179 d
#6 - 155 d, 155 w
#7 - 130 d, 130 w
#8 - 156
well there are some numbers that are too low and didnt change when i did a wet test. So, hopefully it is in the valves.
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