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Compression Testing

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Old Nov 5, 2008 | 08:16 PM
  #1  
Kwint Sommer's Avatar
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Default Compression Testing

I'm looking into a buying an '03 Lincoln Navigator engine to swap into my '01 Stang.

I was inquiring about it and they claim, "It has 49000 miles and the compression is 275."

What does a compression of 275 mean? I understand the compression ratio but I'm pretty sure that's not one.

Also, I have experience working as a mechanic (not on cars) but have never done an engine swap. Any good reference guides online or otherwise?

Oh ya, I know this is a DOHC and is accordingly a decent bit harder to do than an SOHC but I think it will be worth it in the end. That said, any advice is appreciated.
 
Old Nov 5, 2008 | 08:19 PM
  #2  
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Um they are saying it has 275psi of compression from a compression test? thats well, kinda high lol.
 
Old Nov 5, 2008 | 10:28 PM
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Indeed. 100 is the normal pressure used. You can also do 50 and multiply the results by two, but that's usually considered to be less accurate.
 
Old Nov 5, 2008 | 10:31 PM
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Oh yeah.. One more thing. There's a 170+ page thread on this forum concerning 5.4 swaps . You might want to take a look at it..
 
Old Nov 5, 2008 | 10:36 PM
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Kwint Sommer's Avatar
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Originally Posted by audikillsbmw
Oh yeah.. One more thing. There's a 170+ page thread on this forum concerning 5.4 swaps . You might want to take a look at it..
Thanks, I've been slowly reading through it for the last week. Unfortunately it's all 2v stuff so far.
 
Old Nov 5, 2008 | 11:20 PM
  #6  
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There's a bit of 4v info in there as well. You can certainly do a new post asking for a quick overview of what a 4v swap would involve. They don't mind repeating themselves
 
Old Nov 6, 2008 | 12:35 PM
  #7  
Kwint Sommer's Avatar
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Can anyone point me to a service manual for the Lincoln Navigator so I can look up the proper compression numbers?
 
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