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3.9-4L differneces???

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ebspak6

Post subject: 3.9-4L differneces???

Posted: Sat Feb 05, 2005 5:17 pm

Oompa Loompa

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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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nutrok4

Posted: Sun Feb 06, 2005 12:35 pm

Oompa Loompa

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is your car mpefi or cfi?

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Epitome

Posted: Sun Feb 06, 2005 2:26 pm

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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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kermey

Posted: Sun Feb 06, 2005 3:13 pm

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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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madmax

Posted: Sun Feb 06, 2005 3:58 pm

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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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Epitome

Posted: Sun Feb 06, 2005 5:52 pm

Smokin em up

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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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Kel.
BHR
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240 inch Dragster
466 Big Block Ford
650hp
8.40 @ 156mph (251kph)

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