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V6 4.0 Engine Compression Questions

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Old Feb 21, 2006 | 09:02 PM
  #1  
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rio002
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Lightbulb V6 4.0 Engine Compression Questions

I was wondering what the compression on a V6 4.0 engine should read.
Any help is appreciated Thanks!
 
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Old Feb 22, 2006 | 07:57 AM
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I can't answer your question for sure, but Ford has historically used a "relative" method, meaning they should be clustered relative to each other. For instance, for the 4.9 they say if one cylinder has 150, the minimum allowable for any other would be 113.
Personally, I feel that's a stretch.
 
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Old Feb 22, 2006 | 09:12 AM
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Originally Posted by srercrcr
I can't answer your question for sure, but Ford has historically used a "relative" method, meaning they should be clustered relative to each other. For instance, for the 4.9 they say if one cylinder has 150, the minimum allowable for any other would be 113.
Personally, I feel that's a stretch.
Thats right on the money. The cylinder that has the lowest rating should not be lower 75% of the highest rated cylinder.
 
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Old Feb 22, 2006 | 10:39 PM
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Those specs. are mostly warranty CYA. 10-15% max variation or problems will be apparent.
 
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Old Feb 22, 2006 | 11:54 PM
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Thanks all, sounds like the engine we picked up is right in line on the compression.
 
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