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3.9l 4.0l difference 

 

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 Post subject: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 2:53 am 
Oompa Loompa
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Just wondering why the 3.9 is said to have 139kw and the 4.0 148kw does the extra 100cc make that much difference or is it the ecu? Or something else im talking about ea eb

 

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Low and slow yeah.... But not that slow but low... But not to low either... yeah

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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 10:31 am 
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there is really only 40cc difference from the 3.9 to 4.0l.
it comes down to compression ratio and the 3.9 has smaller intake ports..
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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 11:43 am 
Oompa Loompa
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Ah ok thanks so would a 4l head work on the 3.9 cos the 2 engines look exactly the same do they have the same block?

 

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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 12:16 pm 
Getting Side Ways
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I beleve they are the same bore with a slightly different stroke (someone correct me if I'm wrong) But yes a 4.0i Head will work no issues on a 3.9i

Gab
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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 12:17 pm 
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eaboomer wrote:
Ah ok thanks so would a 4l head work on the 3.9 cos the 2 engines look exactly the same do they have the same block?


yes, the blocks are pretty much the same..
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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 12:26 pm 
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Gab1 wrote:
I beleve they are the same bore with a slightly different stroke (someone correct me if I'm wrong) But yes a 4.0i Head will work no issues on a 3.9i

Gab


nope, same stroke.. same crank,rods ect just a smaller bore..

the rare a** ea 3.2 has a shorter stroke..
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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 12:43 pm 
Oompa Loompa
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Thanks guys i thought as much easy upgrade till i get a au motor just gotta do some reasearch on how vct is gonna work in the ea

 

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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 12:55 pm 
Getting Side Ways
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TROYMAN wrote:
Gab1 wrote:
I beleve they are the same bore with a slightly different stroke (someone correct me if I'm wrong) But yes a 4.0i Head will work no issues on a 3.9i

Gab


nope, same stroke.. same crank,rods ect just a smaller bore..

the rare a** ea 3.2 has a shorter stroke..

hmm 3.2 with a 4.0l head and turbo

 

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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 7:31 pm 
Getting Side Ways
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I have an EA 3.9 head on my 4.0 ( ED )....using the 4.0 rocker gear, and currently using an EF XR6 camshaft ( had an EA MPFI cam before )......in a few weeks, I'll get it dyno'd....but first I will need to fine tune it a bit more.......I had 150 rwkw before the changes.

 

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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 7:40 pm 
Getting Side Ways
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bry40l wrote:
hmm 3.2 with a 4.0l head and turbo

The RPM would be crazzzyyy

 

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 Post subject: Re: 3.9l 4.0l difference
Posted: Sat Jun 02, 2012 8:23 pm 
Getting Side Ways
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REW93N wrote:
bry40l wrote:
hmm 3.2 with a 4.0l head and turbo

The RPM would be crazzzyyy


thats if it holds up but that would be mad!
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