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Is there any difference in a 3.9 mpi and 3.9 cpi? 

 

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 Post subject: Is there any difference in a 3.9 mpi and 3.9 cpi?
Posted: Fri Feb 25, 2005 8:52 pm 
Getting Side Ways
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besides the obvious multi and centre point, reason i ask is can i reabuild a cpi motor ( just long motor, no access ) and stick my mpi gear on it and back into my car? i think its all exactly the same apart from the manifolds for the different injection setups... am i right?
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Posted: Fri Feb 25, 2005 11:40 pm 
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I think so..There maybe variations in compresion etc but atleast it all goes together...Some have done it on here but I guess info has been lost ?

 

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Posted: Sat Feb 26, 2005 10:15 am 
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There is a nice guide on doing this here: http://www.ford-tech.com/articles.php?articleId=46
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Posted: Sat Feb 26, 2005 10:46 am 
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same motor , same head, just make sure you get a 3.9 not a 3.2
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Posted: Mon Apr 25, 2005 10:02 pm 
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how can you tell the difference in the 2?
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Posted: Mon Apr 25, 2005 10:10 pm 
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Felony wrote:
how can you tell the difference in the 2?
Cheers

Should have 3.9 cast into the front of the head, however if someone has changed the head, it may be a 3.9 head on a 3.2 block. The only way your going to tell then is to measure the stroke.

3.2 stroke 79.3mm
3.9 stroke 99.31mm

 

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