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2G Looking for advice on head rebuild

Posted by Sjd6795, Aug 27, 2020

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  1. Sjd6795

    Sjd6795 Proven Member

    597
    114
    Joined May 14, 2014
    Wilsonville, Oregon
    So I think to get the experience I am just going to go ahead and rebuild my head myself. I'm not looking to do anything fancy, my car is around 320WHP and I only need to replace my exhaust valves but I figure while it's all out what are other things that should be done.

    Also if you could provide brands or links to the parts you'd buy.

    Picture attached as to why I am having to replace some the valves :(
     

    Attached Files:

    Street Build 662  13

    1997 Mitsubishi Eclipse GSX
    322 whp · 331 lb/ft · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  2. TK's9d2TSi

    TK's9d2TSi Supporting Member

    4,041
    1,508
    Joined Sep 11, 2017
    Cincinnati, Ohio

    524  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    553  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 3K  5

    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
    Loading...
  3. Sjd6795

    Sjd6795 Proven Member

    597
    114
    Joined May 14, 2014
    Wilsonville, Oregon
    Won't be having it machined.. I've already put about $500 into maintenance as I keep breaking it down further it keeps adding more money. I'll give that thread a good look over, why do you think my valve chipped away in the first place? Did it get to hot because it has to much build up and it couldn't transfer enough heat into the head? Also what website do you recommend using for buying new parts. I found some OEM valves but they was $37 each so not looking to spend that much on a valve job.
     

    Street Build 662  13

    1997 Mitsubishi Eclipse GSX
    322 whp · 331 lb/ft · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  4. TK's9d2TSi

    TK's9d2TSi Supporting Member

    4,041
    1,508
    Joined Sep 11, 2017
    Cincinnati, Ohio
    From what I’ve read that it’s possibly from leaking exhaust gases. These were mine at about 130k. Got a set of used evo 8 exhaust valves for $15. Maybe try evo forums.

    A0F4EBC1-1A02-4984-AAC4-FE45824A1D94.jpeg 397A647D-029C-48DE-A7A8-B591182FAB31.jpeg
     

    524  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    553  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 3K  5

    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
    Loading...
    Sjd6795 likes this.
  5. TK's9d2TSi

    TK's9d2TSi Supporting Member

    4,041
    1,508
    Joined Sep 11, 2017
    Cincinnati, Ohio
    I also had 3 intake valves out of round so take a look at those too.

     

    524  3

    2000 Jeep Cherokee Sport - Classic
    awd · automatic · Misc Vehicles

    553  4

    93 Civic 4 Door -sold-
    fwd · manual · Misc Vehicles

    Street Build 3K  5

    1992 Eagle Talon TSi AWD
    12.2 @ 120 · 1G DSM
    Loading...
    Sjd6795 and 1990TSIAWDTALON like this.
  6. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    6,915
    3,063
    Joined Nov 14, 2013
    Independence, Kansas
    Clean up the used valves and lap them in with compound to see if the seal is good and in the middle of the valve when you get to that point. We do ours. Supertech blue viton valve stem seals BTW.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    2K  15

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    936  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  15  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
    Sjd6795 and TK's9d2TSi like this.
  7. Sjd6795

    Sjd6795 Proven Member

    597
    114
    Joined May 14, 2014
    Wilsonville, Oregon
    Good to know thanks, at least the seals are cheap LOL. I can't say the same thing about valves though. I feel like I am going to drop $300 just into replacing valves and I might as well get some cams to toss in there as well.
     

    Street Build 662  13

    1997 Mitsubishi Eclipse GSX
    322 whp · 331 lb/ft · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  8. Sniffbooger

    Sniffbooger Proven Member

    218
    72
    Joined Apr 12, 2020
    Torrance, California
    Well as long as you're gonna throw some money into it, get some roller rocker arms, new 3g lifters and heavy duty springs as well!
    :)
     

    Street Build 350  8

    1998 Mitsubishi Eclipse GST
    fwd · manual · 2G DSM
    Loading...
    Sjd6795 likes this.
  9. Dericsh

    Dericsh Supporting Member

    550
    43
    Joined Nov 25, 2002
    Pearl River, Louisiana
    my experience with valves that burn like that is with Honda S2000 and not DSM, but I would be looking for a bad injector especially if it’s only one cylinder doing it.
     

    Street Build 388  2

    1991 Mitsubishi Eclipse GST
    fwd · manual · 1G DSM
    Loading...
  10. Sjd6795

    Sjd6795 Proven Member

    597
    114
    Joined May 14, 2014
    Wilsonville, Oregon
    That could be the case.. I swapped to some Delphi 680cc but they seemed to work great. I had issues with throttle tip in where the car didn't want to boost but that was only for 1-2 seconds during tip in, once I was cruising or WOT it pulled hard within AFR. I figured it was just with my tune as I never dialed it in.
     

    Street Build 662  13

    1997 Mitsubishi Eclipse GSX
    322 whp · 331 lb/ft · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  11. Sjd6795

    Sjd6795 Proven Member

    597
    114
    Joined May 14, 2014
    Wilsonville, Oregon
    How do these look? I didn't see much of a difference between the supertech and these GSC ones. The GSC ones come in a 16 pack for both intake and exhaust side so that's why I'm leaning towards that.

    https://www.extremepsi.com/store/Fe...1990-1999-EVOUTION-VIII-and-IX-2003-2006.html
    https://www.extremepsi.com/store/Fe...1990-1999-EVOUTION-VIII-and-IX-2003-2006.html
    https://www.extremepsi.com/store/GS...e-90-99-and-Evolution-8-9.html?keep_https=yes
     

    Street Build 662  13

    1997 Mitsubishi Eclipse GSX
    322 whp · 331 lb/ft · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...
  12. 1990TSIAWDTALON

    1990TSIAWDTALON Moderator

    6,915
    3,063
    Joined Nov 14, 2013
    Independence, Kansas
    Those seals are fine. I get them on ebay even. As long as they are blue viton.
    I run Supertech valves that are nitrided.
    Check into a seal install tool. Its plastic and not expensive and makes the seal install a breeze, like this one...... https://www.euroexportinc.com/valve-seal-installation-tool-mitsubishi-4g63/
    The valves that you reference are good too, I've never ran them personally is all.
     

    Street Build 5K  29

    1992 Eagle Talon TSi AWD
    14.74 @ 117.04 · 1G DSM

    2K  15

    1990 Mitsubishi Eclipse GSX
    awd · manual · 1G DSM

    936  18

    1967 Chevrolet Camaro RS
    rwd · automatic · Misc Vehicles

    Street Build 1K  7

    1998 Eagle Talon TSi
    fwd · manual · 2G DSM

    Street Build 6K  15  25

    1990 Eagle Talon TSi AWD
    13.620 @ 108.460 · 1G DSM
    Loading...
  13. Sjd6795

    Sjd6795 Proven Member

    597
    114
    Joined May 14, 2014
    Wilsonville, Oregon
    Awesome well I just placed the order for the valves and seals. I also decided to order some BC 268/272 cams as well.
     

    Street Build 662  13

    1997 Mitsubishi Eclipse GSX
    322 whp · 331 lb/ft · 2G DSM
    Sjd6795

    Street Build 1K  0

    1991 Eagle Talon TSi AWD
    manual · 1G DSM
    Loading...

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