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1g and 2g 4g63

Posted by Tammalynn, Feb 8, 2011

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  1. Tammalynn

    Tammalynn Probationary Member

    11
    0
    Joined Feb 8, 2011
    Scottdale, Pennsylvania
    I've heard that the 4g63 engine from the 1st gen was built stronger than a 4g63 from a 2nd gen. I don't know much about them and haven't been able to truly compare them. And if the 1st gen 4g63 is built better, how different is it from a 2nd gen? Is it easily swapped or will it need conversions? :confused:
     

    213  0

    1991 Eagle Talon N/T
    manual · 1G DSM
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  2. topekagsx

    topekagsx Proven Member

    40
    0
    Joined Nov 14, 2009
    Topeka, Kansas
  3. Black Widow97

    Black Widow97 Proven Member

    11,231
    27
    Joined Sep 2, 2010
    Oxbow, North Dakota
    The only reason people say the 6 bolt (1st gen) is stronger is because everyone blew the crankwalk with 7 bolt blocks (2G from 95-97) issue way out of perportion. Chances are you will never have to worry about CW with any DSM you buy. Also 98-99 blocks are not said to be prone to CW becayse they have a split trust bearing. Yes it takes modification to put a 6 bolt into a 2G car.
     

    2K  0

    1997 Eagle Talon TSi AWD
    12.943 @ 112.280 · 2G DSM
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  4. white92talontsi

    white92talontsi Proven Member

    980
    7
    Joined Nov 12, 2003
    Fayetteville, North Carolina
    6 bolt uses a stronger rod, so yes it is a stronger motor.


    Sent from my PC36100 using Tapatalk
     
  5. motormouth19

    motormouth19 Probationary Member

    2
    0
    Joined Feb 23, 2007
    jacksonville, Alabama
    The engines are pretty much identical in most ways that i have came across. The 14b turbo that comes with manual 1g's are larger than the 2g t-25. And the 1g comes with a 6 bolt flywheel rather than a 7-bolt like with the 2g. There might be a few minor differences here and there but nothing drastic. the 2gen intake manifold flows a little better. i have swapped a 7bolt with a six bolt and 6 bolt with 7 bolt. 7 bolts are from what i hear more likely to crankwalk. again i have not ran into any issues. one thing i have came across in my dsm play time that was kinda annoying was the 90 came with an oil cooler. and there are a few couplers that are moved around noting that will completely ruin your day tho.
     
  6. dboyle23

    dboyle23 Proven Member

    297
    12
    Joined Jun 10, 2010
    Chicago, Illinois
    This is what I have come across on this board.
    1g = 6 bolt
    2g = 7 bolt

    6 bolts have stronger rods = able to withstand more horsepower.
    2g heads flow better.
    2g pistons are better.
    2g exhaust manifold flows better.
    1g has a slightly bigger intercooler, which is good if you have the 14b from a manual 1g. Will not bolt on to a 2g without modification.
    1g blow off valve is better since the 2g bov leaks.

    best combo = 6bolt block with 1g rods and 2g pistons with a 2g head.

    correct me if I am wrong please.
     

    476  0

    1999 Mitsubishi Eclipse GSX
    manual · 2G DSM
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  7. Absit

    Absit Proven Member

    2,393
    38
    Joined Dec 19, 2002
    Davenport, Iowa
    1Ga = 6 bolt
    1Gb and 2G = 7 bolt
    2G heads flow different, not better.
    2G pistons have a higher compression ratio, not better.
    The best combo depends greatly on what you want to do with the car.
    The rest is accurate enough.
     
  8. 1G King Koopa

    1G King Koopa Proven Member

    48
    0
    Joined Sep 23, 2010
    Crown Point, Indiana
    92 1gb's have a 6 bolt
    92.5 and up don't
     
  9. LiquidX

    LiquidX DSM Wiseman

    8,304
    107
    Joined Sep 19, 2008
    Anywhere, Pennsylvania
    The 2g head is a much better design and velocity wins over mass air flow until you are reaching the flow point where it becomes a restriction. Many top vehicles are running 2g heads for the velocity.

    If I really had a choice, I'd build up a 98/99 7 bolt as it has less rotational mass by having a smaller crank. Plus it'll drop right in on my vehicle and I wouldn't have to turn off a CEL check for random misfires.
     

    Street Build 3K  0

    1997 Eagle Talon TSi AWD
    manual · 2G DSM
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  10. ShadowRS99

    ShadowRS99 Proven Member

    121
    0
    Joined Jan 31, 2011
    Mobile, Alabama
    1g block, 2g head, 1g pistons (for lower compression ratios which will allow more boost, correct me if I'm wrong), should sit in fine...
     

    293  0

    1999 Mitsubishi Eclipse N/T
    · 2G DSM
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  11. Absit

    Absit Proven Member

    2,393
    38
    Joined Dec 19, 2002
    Davenport, Iowa
    It's not quite as simple as lower CR = more boost and thus more power, but given a certain fuel, yes, you can run higher boost with lower compression ratios, though that's not always a good way to get your power.
     
  12. ShadowRS99

    ShadowRS99 Proven Member

    121
    0
    Joined Jan 31, 2011
    Mobile, Alabama
    I agree, but I was trying to simplify...
    If I turbo the stock engine I have (throwing out strength) with a higher compression then my engine would blow quicker under less boost than something with a lower compression ratio...
    but a higher compression ratio helps too, more so on N/T cars though...
    but I would still stay low for turbo...
    that way I could run more boost without worry...
     

    293  0

    1999 Mitsubishi Eclipse N/T
    · 2G DSM
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