Jump to content


Welcome to Ultimate Subaru Message Board, my lurker friend!

Welcome to Ultimate Subaru Message Board, an unparalleled Subaru community full of the greatest Subaru gurus and modders on the planet! We offer technical information and discussion about all things Subaru, the best and most popular all wheel drive vehicles ever created.

We offer all this information for free to everyone, even lurkers like you! All we ask in return is that you sign up and give back some of what you get out - without our awesome registered users none of this would be possible! Plus, you get way more great stuff as a member! Lurk to lose, participate to WIN*!
  • Say hello and join the conversation
  • Subscribe to topics and forums to get automatic updates
  • Get your own profile and make new friends
  • Classifieds with all sorts of Subaru goodies
  • Photo hosting in our gallery
  • Meet other cool people with cool cars
Seriously, what are you waiting for? Make your life more fulfilling and join today! You and your Subaru won't regret it, we guarantee** it.

* The joy of participation and being generally awesome constitutes winning
** Not an actual guarantee, but seriously, you probably won't regret it!

Serving the Subaru Community since May 18th, 1998!

Guest Message by DevFuse
 

Photo
- - - - -

85 GL Hatch 1.8 motor build

engine porting performace

  • Please log in to reply
7 replies to this topic

#1 bcmohr

bcmohr

    Member

  • Members
  • PipPip
  • 13 posts
  • Vinton, Iowa

Posted 23 October 2013 - 04:54 PM

   Ok, so I have just every part I need to get this project actually running.

 Special thanks to Wallaby and Vapor Trail for the engine parts.

 

The heads arrived on Tuesday looking like this

Attached Files


Edited by bcmohr, 23 October 2013 - 05:26 PM.


#2 bcmohr

bcmohr

    Member

  • Members
  • PipPip
  • 13 posts
  • Vinton, Iowa

Posted 23 October 2013 - 04:58 PM

I got the heads into the shop today and tore them down.

 

They were in pretty good shape, one cylinder looks like it might have been running lean. The springs are dual springs and in great shape.

Attached Files



#3 bcmohr

bcmohr

    Member

  • Members
  • PipPip
  • 13 posts
  • Vinton, Iowa

Posted 23 October 2013 - 05:07 PM

Next came some pretty work. I figured there would be all sorts of casting under these valves to hog out and blend in. I was wrong. Being that this is my first EA81 build, had to learn a little as I went.  I sure wish that the intake runners were siamesed together instead of the exhaust  Theres no good way to get flow through these heads and not much material to change the flow characteristics. 

 

Theres a tiny pile of shavings from doing one head, thats probably 90% of the material that I took out.

 

Then it was time to cut the valves and smooth out the combustion chambers so when I add the turbo, there are no hot spots.

 

Attached Files



#4 bcmohr

bcmohr

    Member

  • Members
  • PipPip
  • 13 posts
  • Vinton, Iowa

Posted 23 October 2013 - 05:11 PM

Heres how the valves came out.  The valves are 1.65 IN and 1.375 EX, larger than I thought they'd be which is good, something needs to flow in the little motor.

 

I turned the intakes valves at 45 and 20 degrees

The exhaust valves are 45 and 30 degrees

 

All but one valve was in great shape, just a little bit of hammering on an intake valve that cleaned out quick.

Attached Files



#5 bcmohr

bcmohr

    Member

  • Members
  • PipPip
  • 13 posts
  • Vinton, Iowa

Posted 23 October 2013 - 05:14 PM

I have some more work to do yet, have to get the heads planed, turn the seats, blast off all of the gunk and then they'll be ready to bolt onto the NOS 1.8 block.

 

Looking good so far. These build so much faster than the V8 fords, chevys and olds motors Im used to.



#6 bcmohr

bcmohr

    Member

  • Members
  • PipPip
  • 13 posts
  • Vinton, Iowa

Posted 23 October 2013 - 05:16 PM

More pics to come!



#7 The Dude Abides

The Dude Abides

    WileE Coyote Super Genius

  • Members
  • 2,943 posts
  • West Des Moines, IA

Posted 23 October 2013 - 06:14 PM

Hey, do i know you.  ;)



#8 bcmohr

bcmohr

    Member

  • Members
  • PipPip
  • 13 posts
  • Vinton, Iowa

Posted 24 October 2013 - 12:01 PM

Um, maybe. Cant say your name and profile pic ring a bell.






0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users