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Guest Message by DevFuse
 

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EA82 head porting?


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14 replies to this topic

#1 nncoolg

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Posted 15 January 2010 - 11:40 PM

After disecting the spare set of heads ( link ), I am about to embark on the porting adventure, just wondering if anyone would like to share their handiwork...

Here is a link (the only one I could find) I found...

Would probably be quite nice on a set that weren't cracked, certainly some good gains to be had in the exhaust 'bowl'

#2 nncoolg

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Posted 15 January 2010 - 11:41 PM

reserved for my result pics...

#3 Jerry DeMoss

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Posted 16 January 2010 - 12:08 AM

The only advise I can really give you on your ea82t heads is to be careful and not take too much material away from the ports as the head castings are rather thin compared to other subaru's. The best thing you could do is to match the heads to the gaskets and take only as much away as needed and blend the port to the gasket matched portion.

Good luck:)

#4 AWD TURBO!

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Posted 16 January 2010 - 12:14 AM

well i know ware not to grind now good picks

#5 nncoolg

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Posted 16 January 2010 - 05:22 PM

I just found thread that sounds very interesting, does anyone happen to have a copy of the pictures?

http://subaruxt.com/... porting#p66398

#6 kiwi subbie

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Posted 17 January 2010 - 12:40 AM

I just found thread that sounds very interesting, does anyone happen to have a copy of the pictures?

http://subaruxt.com/... porting#p66398


Im pretty sure I saved the pics for that. just would have to sort out thru 10,000 or more pics :rolleyes::lol:

#7 nncoolg

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Posted 17 January 2010 - 12:44 AM

sweet, would you mind having a look, and putting them up here? Im sure they would prove useful, maybe someone could sticky them? - you can sticky mine too if you like.

#8 kiwi subbie

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Posted 17 January 2010 - 12:45 AM

I mite even be able to find the ported and polished Heads for my Old RX EA82 motor I take some pics if you like some? They are well n truely shot tho.

#9 nncoolg

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Posted 17 January 2010 - 12:50 AM

Yeah, that'd be good, but I really want to see the above mentioned cut heads, and combine that information with mine....

#10 nncoolg

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Posted 20 January 2010 - 05:02 AM

bump

#11 robm

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Posted 21 January 2010 - 10:22 AM

The last Japanese car I pulled the head off was a Datsun 510. The combustion chambers were polished mirror smooth, compared to those. It was bone stock from the factory. The Subaru ones look more like Chevy heads. I am shocked at the drop in standards over the years. Polishing combustion chambers was where a port and polish job started with the Chevies.

Unless extensive flow and combustion event testing has shown this to be a myth, I would start by making those chambers smooth. (And I am pretty sure Sir Harry Ricardo liked smooth combustion chambers. Good enough for me.) No chance of making holes in the wrong place, either.

#12 Quidam

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Posted 21 January 2010 - 12:08 PM

" I would start by making those chambers smooth."

Here's some thoughts about that.

By doing so you're less likely to have deposits stick and cause pre-detonation, spark knock and so forth.

You take out any sharp edges that lead to the above, detonation. When they get hotter than the surrounding material.

You can equalize the combustion chamber for a more balanced, smoother running engine.

Doug

#13 kiwi subbie

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Posted 21 January 2010 - 04:57 PM

Yeah, that'd be good, but I really want to see the above mentioned cut heads, and combine that information with mine....


Its taken me a very long time but Ive have found some of those pics.
I can only find a few of the cut away ER27 and etc heads.

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#14 nncoolg

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Posted 22 January 2010 - 06:02 AM

nice man, now do you have the photos of yours?

#15 Txakura

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Posted 22 January 2010 - 10:38 AM

Good lord, how long does it take to hack saw through a head?




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