Compression Testing
#1
11-05-2008, 08:16 PM
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.
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.
#2
11-05-2008, 08:19 PM
Um they are saying it has 275psi of compression from a compression test? thats well, kinda high lol.
#3
11-05-2008, 10:28 PM
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.
#4
11-05-2008, 10:31 PM
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..
. You might want to take a look at it..
#5
11-05-2008, 10:36 PM
Thanks, I've been slowly reading through it for the last week. Unfortunately it's all 2v stuff so far.
#6
11-05-2008, 11:20 PM
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 
#7
11-06-2008, 12:35 PM
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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