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  1. #1

    94 Galant GS pistons

    Just sniffin around to see if anyone has or knows where I could locate a set of 10:1 pistons for a 94 Galant GS. Used are fine, dont really feel like paying 500+.00 for afermarket.
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  2. #2
    Senior Moderator DOHCstunr's Avatar
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    the compression difference on the GS comes from the head. Not the pistons.
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    1994 Galant GS-Turbo

  3. #3
    I had both in my hand, the recess noticeably less on the GS pistons than the std ones. Mitsu stated that they are 'no longer available' as they have their own part number. Whats up with that?
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  4. #4
    You are here entirely tooo much!! Galanttuner10's Avatar
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    if u have a 7g 2.4 with the stock pistons and the dohc ur compression ratio should be around 10:1 and not the stock 9.5
    2014 Lancer Evo GSR
    1996 Galant S 5 Speed Turbo
    Need a Turbo rebuilt or upgraded--> http://www.thegalantcenter.org/showt...ebuild-Service

  5. #5
    You are here entirely tooo much!! Galanttuner10's Avatar
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    did a quick search in the mitsu caps

    3 different part numbers according to the system

    94-mid 95 7gs had MD188114

    mid 95-98 7gs had MD303070

    and the gs does have its own part number

    MD193495

    now if you look it up the GS pistons are the cheapest, not sure what that means as in quality. i couldnt find anything about different compressions though either.
    2014 Lancer Evo GSR
    1996 Galant S 5 Speed Turbo
    Need a Turbo rebuilt or upgraded--> http://www.thegalantcenter.org/showt...ebuild-Service

  6. #6
    Experienced TGC Member mysticj's Avatar
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    Quote Originally Posted by Joel91GS View Post
    I had both in my hand, the recess noticeably less on the GS pistons than the std ones. Mitsu stated that they are 'no longer available' as they have their own part number. Whats up with that?
    As well as the "64D" stamped on the top of the pistons. They may finally ending production for the GS pistons. If you want 10:1 compression, I will suggest swapping either the Hyundai G4CN or G4CR/G4CP head as the compression chambers are smaller than the 4G63 head. The G4CN heads are found in the 93-95 Elantra 1.8L, the G4CR found in the 93-95 Elantra 1.6L, and the G4CP in the 92-98 Sonata 2.0L. The difference between the G4CN and G4CR/G4CP is the shape of the intake ports: G4CN is the same as the 1G 4G63 while the G4CR/G4CP is somewhat oval shape close to comparsion to the 2G 4G63 intake ports.
    94 Galant GS: 4G67 head, 1G IM, Evo 8 TB, DeltaCam 272/264 Cams, Test Pipe, OE Avenger V6 60mm catback w/muffler, modified Outlander header, DIY COP setup, B/S delete, 315cc injectors, AEM UEGO WBO2, Black case 3G ECU

    1994 GS FYI
    DSM/CSM Manuals

  7. #7
    You are here entirely tooo much!! Galanttuner10's Avatar
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    i really didnt think they were different as when we dohc swap we end up 10:1
    2014 Lancer Evo GSR
    1996 Galant S 5 Speed Turbo
    Need a Turbo rebuilt or upgraded--> http://www.thegalantcenter.org/showt...ebuild-Service

  8. #8
    Hey thanks for the info, I KNEW they were different, I bought them from a guy on another DSM site 2 years ago for that specific reason. Its no big deal. I actually have used the Hyundai heads on other applications, in fact I think that we used a 1.6 hyundai head with the 94 GS pistons and had really good results. Im considering updating the trans on my galant from auto to manual ( auto is a pain in the a$$) and I just acquired cams from that actual 2.4 GS motor, also have the head and intake too, but someone had already taken the block. This would be the 4th dohc 2.4 7 bolt that we've built with really good results, they run great and realiable. Would be awesome to throw one of these into a 92 Mirage GS if I could find one, Im too lazy to try to rewire a base model and making mounts etc.
    Last edited by Joel91GS; 08-23-2010 at 07:22 AM
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  9. #9
    Experienced TGC Member mysticj's Avatar
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    Stock GS cams are okay, they are based on the Euro NA 4G63 cams but with smaller lift. You are better off getting some used 264/272 cams

    As far as intake manifold goes, try to get an Evo I-III or RVR SSG/HSG. They have shorter runners.
    94 Galant GS: 4G67 head, 1G IM, Evo 8 TB, DeltaCam 272/264 Cams, Test Pipe, OE Avenger V6 60mm catback w/muffler, modified Outlander header, DIY COP setup, B/S delete, 315cc injectors, AEM UEGO WBO2, Black case 3G ECU

    1994 GS FYI
    DSM/CSM Manuals

  10. #10
    I have a short runner intake on it now, the stock one. The 2G (7g) head and intake have the long runners and a huge plenum. I dont want a race car, just wanted to add some bolt ons to give it a few more hp....the 9.5:1 2.4 in it now works really well. So you actually own a 94 GS? Ive never seen one on the road and the u pull it I go to had one but wasnt in a position to try to get anything that day, 3 days later I went back and the block was gone and the head and cams were literally thrown on the ground. One cam was 2 cars away. I dont get it.
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  11. #11
    Experienced TGC Member mysticj's Avatar
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    The GS is a nice car, even in NA form. I guess the person pulling the engine has no clue about the GS.
    94 Galant GS: 4G67 head, 1G IM, Evo 8 TB, DeltaCam 272/264 Cams, Test Pipe, OE Avenger V6 60mm catback w/muffler, modified Outlander header, DIY COP setup, B/S delete, 315cc injectors, AEM UEGO WBO2, Black case 3G ECU

    1994 GS FYI
    DSM/CSM Manuals

  12. #12
    That was my thought. They took the block probably assuming its the usual 94-98 block which it is but they are going to have a few more hp with those pistons in there. I didnt bother taking the head for myself, I have a head from a 98 Sonata and its EXACTLY the same, intake and all. ( with the long runners) I felt lucky just to get the cams once I found them. People are brutal at these u pull its, they will destroy an engine just to get a piston or 2 and leave all the rest in the mud. Youll have to fill me in on your mods to your GS, 4G67 head? Is that how you got that CR?
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  13. #13
    Experienced TGC Member mysticj's Avatar
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    Yep. 4G67=G4CN from an Elantra, bump the compression to around 10.6:1. So far the head, 1G TB and IM, but I have JDM Cyclone IM with a 01 Diamante TB on it sitting in the garage...
    94 Galant GS: 4G67 head, 1G IM, Evo 8 TB, DeltaCam 272/264 Cams, Test Pipe, OE Avenger V6 60mm catback w/muffler, modified Outlander header, DIY COP setup, B/S delete, 315cc injectors, AEM UEGO WBO2, Black case 3G ECU

    1994 GS FYI
    DSM/CSM Manuals

  14. #14
    You are here entirely tooo much!! Galanttuner10's Avatar
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    whoever pulled it if they are using it for a regular 94-98 sohc they will encounter issues as it doesnt have the oil passages needed for the SOHC.

    now i dont know if the pistons will cause more power even though they may have different design. i would figure if they were better they would cost more but they are cheaper than any other 7g piston and when the SOHCs do the head swap we end up in the same ball park with our pistons as it will never be the exact same setup as the OEM GS, diffterent HGs and other parts can lead to differences.

    i want a GS as a project car to make awd turbo
    2014 Lancer Evo GSR
    1996 Galant S 5 Speed Turbo
    Need a Turbo rebuilt or upgraded--> http://www.thegalantcenter.org/showt...ebuild-Service

  15. #15
    Yeah thats right, even tho its 2G block, they blocked the oil passages at the factory, the same five that I PLUGGED on the ones I built, so yes, it wont work unlss they drill them out which they could. The passage is there, just blocked I think. I talked to wiseco and they can make 10.5:1 CR pistons custom, and he said that is the max for pump gas, so I could use hi test if there were any detonation issues. But for 550.00, wow. The factory 10:1s are alot cheaper, and i can use the part number you gave me to try to find them. Thanks, that helps.
    Last edited by Joel91GS; 08-23-2010 at 09:14 PM
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  16. #16
    Hey Mysticj, are you still running your original pistons or did you replace them?
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  17. #17
    You are here entirely tooo much!! Galanttuner10's Avatar
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    glad i can help. i have the CAPS program on my lap top if you need any more part numbers
    2014 Lancer Evo GSR
    1996 Galant S 5 Speed Turbo
    Need a Turbo rebuilt or upgraded--> http://www.thegalantcenter.org/showt...ebuild-Service

  18. #18
    Experienced TGC Member mysticj's Avatar
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    Quote Originally Posted by Joel91GS View Post
    Hey Mysticj, are you still running your original pistons or did you replace them?
    Original GS pistons. If 10.5:1 is the max for pump gas then I guess I reach that threshold. One day I will plan a shortblock with G4js pistons to bump compression to 11.5
    94 Galant GS: 4G67 head, 1G IM, Evo 8 TB, DeltaCam 272/264 Cams, Test Pipe, OE Avenger V6 60mm catback w/muffler, modified Outlander header, DIY COP setup, B/S delete, 315cc injectors, AEM UEGO WBO2, Black case 3G ECU

    1994 GS FYI
    DSM/CSM Manuals

  19. #19
    My first attempt at a 2.4 was a few years ago, I had a 2.4 sonata 1g block given to me, and just for fun I tried to mount the dual cam head and it fit! So I fenangled the timing pulleys and sich and was able to time it with the 2.0 belt ( 2.4 has one more tooth) cause I didnt know that they even made a 2.4 belt so I ran it with those 2.4 oe pistons and the compression was REALLY high, and it went like hell, but all kinds of detonation and oil burning issues. I never got one to work right, tried another block later but still burned oil like crazy. I never had luck with any of the older 1g blocks, 1.8s, 2.0s, 2.4s, but the 2G has served me well. Hone the cylinders, new rings, and they are great. My current one just turned 100k miles since I built it and its just starting to use some oil, not alot, but some. Since I have all the makings for the OE GS setup I figured I throw it all on there and put in a 5 speed and Im good to go.
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

  20. #20
    Quote Originally Posted by Galanttuner10 View Post
    glad i can help. i have the CAPS program on my lap top if you need any more part numbers
    Hey I did give mitsu that part number and no go, they said not at all available. So I will have to get the Wisecos or JDMs and may as well go for 10.5.
    91 Galant GS, 7G 2.4 DOHC conversion 9.5:1 CR, 4 speed auto, 15" Mitsu rally wheels, 19560r15 Hankook Optimo
    98 Chevy Metro, 1.3 16V, 5 speed manual, 14" wheels
    96 Geo Metro, 1.0 3 cyl, XFI trans and cam, 64 MPG
    94 Hyundai Elantra, 7G 2.4 DOHC conversion, 10:1 CR, 5 speed, 19560r15 Falken ZE 912, 2.25 catback *****SOLD******

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