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Another head to port & polish 94AB 

 

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 Post subject: Another head to port & polish 94AB
Posted: Wed Oct 31, 2007 10:37 pm 
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Well, now that my previous head is my car now, I gotta do another head. This one is an EF unit, 94AB, had it sitting out on the veranda for a couple of years, so now its up for a bit of work for my new engine. I'm just about to start.
The funny thing is, the hole in the genuine exhaust manifold gasket, is the same size as the head on the ex valve.

 

 

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My 4.0 EF cyl head 016.jpg
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My 4.0 EF cyl head 015.jpg
My 4.0 EF cyl head 015.jpg [ 336.71 KiB | Viewed 72 times ]
My 4.0 EF cyl head 007.jpg
My 4.0 EF cyl head 007.jpg [ 327 KiB | Viewed 69 times ]
My 4.0 EF cyl head 009.jpg
My 4.0 EF cyl head 009.jpg [ 301.35 KiB | Viewed 69 times ]

 

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Posted: Wed Oct 31, 2007 11:02 pm 
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On that other head you put on your car, what is the thing under where the valves are. The j shaped thingy, and how come this head doesn't have one ? Is that the 'swirl chamber' I have heard people talk about ?

Sorry for my lack of technical words. :)

Looks like you have a lot of fun hours ahead of you. :P Good luck.
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Posted: Wed Oct 31, 2007 11:07 pm 
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Damo wrote:
On that other head you put on your car, what is the thing under where the valves are. The j shaped thingy, and how come this head doesn't have one ? Is that the 'swirl chamber' I have heard people talk about ?

Sorry for my lack of technical words. :)

Looks like you have a lot of fun hours ahead of you. :P Good luck.


The first head is off an EA. Only the 3.9's had that. Was deleted with the intro of the 4.0's. It isn't really a "swirl chamber", more of a guide to produce a swirl.

 

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Posted: Fri Nov 02, 2007 9:49 pm 
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I have just finished polishing one combustion chamber. Took about 2 hrs.

 

 

Attachments:
My 4.0 EF cyl head 012.jpg
My 4.0 EF cyl head 012.jpg [ 422.61 KiB | Viewed 83 times ]
My 4.0 EF cyl head 019.jpg
My 4.0 EF cyl head 019.jpg [ 344.34 KiB | Viewed 87 times ]
My 4.0 EF cyl head 020.jpg
My 4.0 EF cyl head 020.jpg [ 367.6 KiB | Viewed 95 times ]

 

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Posted: Fri Nov 02, 2007 10:44 pm 
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what do u use to polish the chamber ?
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Posted: Fri Nov 02, 2007 10:47 pm 
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MMD wrote:
what do u use to polish the chamber ?


I used a Dremel.

 

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Posted: Fri Nov 02, 2007 10:56 pm 
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y didn't u lay bak the chamber around the valves on the opposite side to spark plug? gains to be had there

 

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Posted: Fri Nov 02, 2007 11:04 pm 
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fritzz wrote:
y didn't u lay bak the chamber around the valves on the opposite side to spark plug? gains to be had there


Not doing it for turbo, N/A, Hypereutectic raised pistons going in. Looking at 10:1 to 10.5:1 comp. ratio.

 

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Posted: Sat Nov 03, 2007 12:23 am 
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The head is going to be shaved as well?

Looks good so far, It'll be interesting to see what it'll do.

 

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Posted: Sat Nov 03, 2007 12:24 pm 
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cjh wrote:
fritzz wrote:
y didn't u lay bak the chamber around the valves on the opposite side to spark plug? gains to be had there


Not doing it for turbo, N/A, Hypereutectic raised pistons going in. Looking at 10:1 to 10.5:1 comp. ratio.



again why didn't you lay back chamber around the valves? if you are using domed pistons the 2 or 3cc gain in chamber size wouldn't matter anyway.
but the flow gain would be well worth it.

seems like alot of time and effort for a gain or 3/8th of f**k all

 

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Posted: Sat Nov 03, 2007 3:55 pm 
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So looking at those pics the intake valve looks like it goes up pretty close to the surface of the head, so how much can you shave off before having issues? hard to see exactly from the pics just how much room there is.

Also the valves look like they are concaved... does anyone make valves with a flat bottom to them for a bit less overall CC volume? Unless there is a proper reason they need to be concaved in like that?
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Posted: Sat Nov 03, 2007 7:48 pm 
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I think tickford_6 is talking about something like this.

 

 

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DSC02951.JPG
DSC02951.JPG [ 60.46 KiB | Viewed 100 times ]

 

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Posted: Sat Nov 03, 2007 7:56 pm 
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fritzz wrote:
y didn't u lay bak the chamber around the valves on the opposite side to spark plug? gains to be had there
Can you explain more (perhaps with an arrow)I am thinking of a DIY head polish and need as much info as I can get.

 

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Posted: Sat Nov 03, 2007 11:04 pm 
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WagonDad wrote:
I think tickford_6 is talking about something like this.




bang on the money

 

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Posted: Sat Dec 01, 2007 9:28 pm 
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I finally got back to it this arvo. I have done the exhaust port now. I have made it the same size as the genuine exhaust gasket as seen in the pic.

 

 

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