Engine Compression Test
08-09-2018, 07:44 PM
#1
Junior Member
Thread Starter
iTrader: (1)
Join Date: Jul 2018
Location: Halifax, NS
Posts: 65
Likes: 0
Received 2 Likes
on
2 Posts
Car: 1989 Firebird
Engine: 305 tbi
Transmission: 700r4
Axle/Gears: 3.43
Engine Compression Test
Hey All
I have a 95 LT1 on my engine stand that im swapping in to my firebird over the coming winter. I did some compression testing tonight. The engine has sat for over a year. First run i did dry
1 - 120 2 - 150
3 - 160 4 - 120
5 - 125 6 - 140
7 - 150 8 - 120
After the first run i added a cap full of oil to each cylinder and did it again.
1 - 200 2 - 215
3 - 195 4 - 195
5 - 200 6 - 200
7 - 205 8 - 200
I was concerned at first as i didn't see much oil pressure, I did loop the oil cooler lines together prior to starting. When i started the second round of testing i started to get oil on the lifters and rockers. I also put a mechanical oil gauge in the block, pressure was around 20-25 while cranking the engine.
No intake or exhaust manifold, cranking with a starter, not by hand.
I have never done this before, is there anything I missed? I watched a few videos and read through a few threads here.Do these numbers look ok? I was considering doing it again in the morning after letting it sit for the night to see if the "dry" numbers are more consistent.
I have a 95 LT1 on my engine stand that im swapping in to my firebird over the coming winter. I did some compression testing tonight. The engine has sat for over a year. First run i did dry
1 - 120 2 - 150
3 - 160 4 - 120
5 - 125 6 - 140
7 - 150 8 - 120
After the first run i added a cap full of oil to each cylinder and did it again.
1 - 200 2 - 215
3 - 195 4 - 195
5 - 200 6 - 200
7 - 205 8 - 200
I was concerned at first as i didn't see much oil pressure, I did loop the oil cooler lines together prior to starting. When i started the second round of testing i started to get oil on the lifters and rockers. I also put a mechanical oil gauge in the block, pressure was around 20-25 while cranking the engine.
No intake or exhaust manifold, cranking with a starter, not by hand.
I have never done this before, is there anything I missed? I watched a few videos and read through a few threads here.Do these numbers look ok? I was considering doing it again in the morning after letting it sit for the night to see if the "dry" numbers are more consistent.
Thread
Thread Starter
Forum
Replies
Last Post
84transamdude
Tech / General Engine
23
05-17-2012 05:41 PM
odddoylerules
Tech / General Engine
4
05-04-2011 03:11 AM
remltr
Tech / General Engine
6
10-31-2010 08:57 PM