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Froudey's Head Project (More Progression 2) 

 

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 Post subject: Froudey's Head Project (More Progression 2)
Posted: Tue May 20, 2008 7:46 pm 
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Hey Guys

I just picked a EB2 4L head (travel 388thou kms) and a few other things for 100 dollars of a my (immature) mate will take some photos tomorrow in the sunlight.. (although we all know what a head looks like).

Going to basically reco it myself (or rebuild it). And then I will port and polish it (slow and steady wins the race).

Just a few Q's!
Are the bits and peices required available new non-gen? (or should i just heavyily clean the internal bits)
Shouls I get the head sandblasted to bring it near new?

That is about it any suggestions well worth it.

 

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Last edited by Froudey on Sat May 31, 2008 11:16 pm, edited 2 times in total.

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Posted: Tue May 20, 2008 8:02 pm 
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See how it cleans up with some degreaser & similar stuff.
Have you got the gear to pull it down???
You can get aftermarket HLA's, not sure how good they are though.
You can get aftermarket valves & valve springs & valve stem seals.
It takes awhile to port & polish the head, and to get them as close as possible as to be all the same as each other.
Have you got the gear to do that too???
You should get the head checked for straight, cracks, and get it machined.
What condition are the valves & seats in????

 

 

Attachments:
My 4.0 EF cyl head 009.jpg
My 4.0 EF cyl head 009.jpg [ 301.35 KiB | Viewed 34 times ]
Modified 4.0lt valves 002.jpg
Modified 4.0lt valves 002.jpg [ 282.25 KiB | Viewed 31 times ]
100_5444.JPG
100_5444.JPG [ 405.61 KiB | Viewed 32 times ]
My 4.0 EF cyl head 020.jpg
My 4.0 EF cyl head 020.jpg [ 367.6 KiB | Viewed 32 times ]

 

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Posted: Tue May 20, 2008 8:21 pm 
Getting Side Ways
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the person i got it off did 5 years work experiance at a local wreckers and was taught by an experianced distmantler.
He checked it for cracks as he was taught (but will double check in sunlight).

Quote:
Have you got the gear to pull it down???
what like i have an array of tools but none head related what do you suggest?
Quote:
Have you got the gear to do that too???
i will be getting a basic dremal set in the upcoming weeks..

I am not going to rush into going to research and take notes and read.

 

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Posted: Tue May 20, 2008 8:24 pm 
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a dremel is not what i would use

air tools will work best :)

 

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Posted: Tue May 20, 2008 8:30 pm 
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Disco Frank wrote:
a dremel is not what i would use

air tools will work best :)


what kind of air tools??

 

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Posted: Tue May 20, 2008 8:32 pm 
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Froudey wrote:
the person i got it off did 5 years work experiance at a local wreckers and was taught by an experianced distmantler.
He checked it for cracks as he was taught (but will double check in sunlight).

Quote:
Have you got the gear to pull it down???
what like i have an array of tools but none head related what do you suggest?
Quote:
Have you got the gear to do that too???
i will be getting a basic dremal set in the upcoming weeks..

I am not going to rush into going to research and take notes and read.


I made my own tooling to assemble/disassemble the head. I made it from what I had lying around. ( i have heaps of materials, leftovers from all sorts of projects..LOL )
The pics are of the same head in the previous post.

 

 

Attachments:
My 4.0 EF cyl head 011.jpg
My 4.0 EF cyl head 011.jpg [ 549.49 KiB | Viewed 41 times ]
My 4.0 EF cyl head 010.jpg
My 4.0 EF cyl head 010.jpg [ 530.7 KiB | Viewed 43 times ]

 

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Posted: Tue May 20, 2008 8:33 pm 
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so the springs need to be compressed???

 

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Posted: Tue May 20, 2008 8:38 pm 
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Froudey wrote:
so the springs need to be compressed???


Yeah!!!, how else did you think you were going to get it apart???
You had better get a w/shop manual, eh?

 

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Posted: Tue May 20, 2008 8:56 pm 
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very well done (cjh ) i like
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Posted: Tue May 20, 2008 9:05 pm 
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badkiwi wrote:
very well done (cjh ) i like



Thanks dude, been doin this stuff for a while.....LOL.

 

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Posted: Tue May 20, 2008 9:31 pm 
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far out mate!
the combustion chamber on that head is that smooth its like a mirror lol...

now thats what i call a polish...
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Posted: Tue May 20, 2008 10:10 pm 
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You can get spring compressors at your local auto shop...or if you are handy with making your own tools like cjh's tool, then that is your best bet. But I'd get a spring compressor :D.

phong =P~

 

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Posted: Tue May 20, 2008 10:29 pm 
Getting Side Ways
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cjh wrote:
Froudey wrote:
so the springs need to be compressed???


Yeah!!!, how else did you think you were going to get it apart???
You had better get a w/shop manual, eh?


i have a work shop manual for 3.9 series. is much if any differences from the 4L onwards?

i will price a spring compressing tool and purchase one when i have the cash. As i said before slow and steady...

Another queastion...
If this head is any good and i go well what is the go with the whole compression issue.... (ie 3.9 raises a 4L compression and a 4L lowers the decompression) is this an issue at all, eg. lower the power out put or torque or even raise said things

 

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Posted: Tue May 20, 2008 10:59 pm 
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The 3.9 head would raise compression because it has smaller ports/ combustion chambers whereas the 4.0 head flows better because of the larger ports and combustion cambers (which means less compression).


I would recommend doing a flow test for the stock 4.0 head you plan to mod, then do another after you have completed your work and determine the differences.


Also, by getting a machinist to skim off the surface of the head, you can raise compression on any head (this will come in handy if you are building a N/A motor).


Maybe try and build it with tickford spec valves and springs to keep costs down?
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Posted: Tue May 20, 2008 11:08 pm 
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Will do the whole ring around tomorrow to get prices and alike.

But what would i expect to pay to get the head surface "skimed"...

Is the a Head VRS kit or something similair?

 

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