Compression Test Question
Thread Starter
|
Senior User
Joined: Sep 2001
Posts: 154
Likes: 0
From: USA
Compression Test Question
If you saw my other post you know I'm going to look at another engine tomorrow. This one I have the oppurtunity of doing a compression test before I decide to take it. What should my numbers be to really pass the test and be considered a good engine. I'm not looking for perfect but just something I wont have major problems with for the next few months. My guess was 100lbs, but is there another accepted number?
Brendan
Brendan
Moderator
Joined: Dec 2001
Posts: 22,436
Likes: 17
From: Louisville,Ky.
Compression Test Question
The actual number is not as inportant than that they are all close to the same . My old 351W that was in my truck was worn out, but it has 125#. As long as they are all within about 25# ypu should be ok.
Post Fiend
Joined: Apr 2002
Posts: 7,157
Likes: 1
From: Central Kali
Compression Test Question
Be sure that the throttle is wide open while testing. The gauge that you hold in the plug hole by brute force does not always give the same readings as the type that screws in the hole. If you get readings around 120 to 140, it should be ok. 
New User
Joined: Jan 2008
Posts: 0
Likes: 24
Compression Test Question
Within 10% lowest to highest readings is considered good.
Make sure you do a dry & a wet test.
[font color=red]Dennis
FTE Assistant Administrator
[/font]
[link:www.ford-trucks.com/guidelines.html|Club FTE]
[link: motorhaven.autoanything.com|How YOU Can Support This Site]
http://www.clubfte.com/users/mil1ion/canada_flag_animated.gif
[link:www.clubfte.com/users/mil1ion/Mil1ion.html|My Website,"North Of The 49th"]
Make sure you do a dry & a wet test.
[font color=red]Dennis
FTE Assistant Administrator
[/font]
[link:www.ford-trucks.com/guidelines.html|Club FTE]
[link: motorhaven.autoanything.com|How YOU Can Support This Site]
http://www.clubfte.com/users/mil1ion/canada_flag_animated.gif
[link:www.clubfte.com/users/mil1ion/Mil1ion.html|My Website,"North Of The 49th"]
