Jump to content
Ultimate Subaru Message Board
Sign in to follow this  
nncoolg

EA82 head porting?

Recommended Posts

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'

Share this post


Link to post
Share on other sites

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:)

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

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

Share this post


Link to post
Share on other sites

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.

Share this post


Link to post
Share on other sites

" 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

Share this post


Link to post
Share on other sites
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.

 

100_5741.jpg

 

100_5744.jpg

 

100_5748.jpg

 

100_5783.jpg

 

100_5792.jpg

 

100_5794.jpg

 

100_5796.jpg

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
Sign in to follow this  

×