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3.9-4L differneces??? 

 

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 Post subject: 3.9-4L differneces???
Posted: Sat Feb 05, 2005 5:17 pm 
Oompa Loompa
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Location: adelaide
SA, Australia

are there any differnces that will make a 3.9 to 4L conversion difficult?
ECU?
manifolds?
any body selling a low km 4L?
what is one worth?
cheers.
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Posted: Sun Feb 06, 2005 12:35 pm 
Oompa Loompa
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is your car mpefi or cfi?
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Posted: Sun Feb 06, 2005 2:26 pm 
Smokin em up
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They have different rods and pistons. I think they have the same crank, but aren't sure on that one.

The heads were redesigned too.

 

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Posted: Sun Feb 06, 2005 3:13 pm 
Getting Side Ways
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I have a 1990 EA-S and it has been changed from 3.9 to the 4L ;)
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Posted: Sun Feb 06, 2005 3:58 pm 
Getting Side Ways
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Epitome wrote:
They have different rods and pistons. I think they have the same crank, but aren't sure on that one.

The heads were redesigned too.


Stroke is the same so I'd say the crank is also, differance in short motor is mainly the bore, giving a whopping 35mls more!

 

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Posted: Sun Feb 06, 2005 5:52 pm 
Smokin em up
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Age: 45

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Ride: 2004 BA Falcon MkII

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Yeah I think the bore was increased VERY marginally.

Then again, with such a long stroke, it wouldn't have made sense to increase the stroke.

 

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BHR
A/MD 1272
240 inch Dragster
466 Big Block Ford
650hp
8.40 @ 156mph (251kph)

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