Compression 351M
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More Turbo
Joined: Feb 2019
Posts: 563
Likes: 4
From: Wolfsburg
Compression 351M
I finally have my truck up and running again with the new battery. As I had nothing to do over the weekend, I decided to do a compression check. I should have done that a long time ago, but never got around to it.
I checked the compression both dry and wet.
Front to Back
Dry/Wet
Bank 1:
120/130
120/180
120/160
110/150
Bank 2:
100/130
120/160
120/150
110/180
I have no experience with interpreting these numbers, I am just guessing that the rings are worn, which is fine since they are going to be replaced in the near future. If anyone sees anything out of the ordinary, Input would be appreciated.
Thank You
I checked the compression both dry and wet.
Front to Back
Dry/Wet
Bank 1:
120/130
120/180
120/160
110/150
Bank 2:
100/130
120/160
120/150
110/180
I have no experience with interpreting these numbers, I am just guessing that the rings are worn, which is fine since they are going to be replaced in the near future. If anyone sees anything out of the ordinary, Input would be appreciated.
Thank You
Laughing Gas
Joined: Feb 2016
Posts: 817
Likes: 27
I’ll post up mine for reference later. I recall anywhere from 130-140 dry cold except for two adjacent cylinders that may have been around 120. Those cylinders did go up wet so I assume rings may be tired too. I’m guessing my engine has never been overhauled just based on its looks.
Laughing Gas
Joined: Feb 2016
Posts: 817
Likes: 27
1980 351M, cd dry compression test. Throttle wide open, all plugs removed.
Cylinders:
1 - 140 psig
2 - 149
3 - 142
4 - 144
5 - 120
6 - 142
7 - 125
8 - 140
I ran a wet test on cylinders 5, 6, and 7, and those values came up to 155, 160, and 145, respectively.
From a seat-of-the-pants standpoint, I’ve been pleased with its response. It’s not going to light anything on fire, but it can generally accelerate with the pace of normal traffic. I consider that a win considering it is 40 years old.
Cylinders:
1 - 140 psig
2 - 149
3 - 142
4 - 144
5 - 120
6 - 142
7 - 125
8 - 140
I ran a wet test on cylinders 5, 6, and 7, and those values came up to 155, 160, and 145, respectively.
From a seat-of-the-pants standpoint, I’ve been pleased with its response. It’s not going to light anything on fire, but it can generally accelerate with the pace of normal traffic. I consider that a win considering it is 40 years old.
Thread Starter
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More Turbo
Joined: Feb 2019
Posts: 563
Likes: 4
From: Wolfsburg
1980 351M, cd dry compression test. Throttle wide open, all plugs removed.
Cylinders:
1 - 140 psig
2 - 149
3 - 142
4 - 144
5 - 120
6 - 142
7 - 125
8 - 140
I ran a wet test on cylinders 5, 6, and 7, and those values came up to 155, 160, and 145, respectively.
From a seat-of-the-pants standpoint, I’ve been pleased with its response. It’s not going to light anything on fire, but it can generally accelerate with the pace of normal traffic. I consider that a win considering it is 40 years old.
Cylinders:
1 - 140 psig
2 - 149
3 - 142
4 - 144
5 - 120
6 - 142
7 - 125
8 - 140
I ran a wet test on cylinders 5, 6, and 7, and those values came up to 155, 160, and 145, respectively.
From a seat-of-the-pants standpoint, I’ve been pleased with its response. It’s not going to light anything on fire, but it can generally accelerate with the pace of normal traffic. I consider that a win considering it is 40 years old.
It only has to last until next winter.
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