May 20, 2012, 11:07:05 AM
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Author Topic: 2G Head on a 1G  (Read 2072 times)

CrackedDSM

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  • Posts: 148
    • 91
    • Eclipse GSX
    • Motor: 4G63 2.0L
    • Head: 1G (large ports)
    • Turbo: Evo 3 16G
2G Head on a 1G
« on: February 04, 2011, 08:49:06 AM »
Alright, I see more than a few of you 1G guys with 2G small port heads on your 1G DSM's, and I'm curious how you like it.  I scored a freshly rebuilt 2g head, resurfaced, 0 miles, all that great stuff for $37, and I couldn't pass it up.  I know that the 2G head flows more stock than even a fully ported 1G head, and plus it's a brand new head for $37.  :P


So basically, I know I'm going to have to bore the head stud/bolt holes in the head 1mm over for my 6 bolt studs, and I'm definitely going to get the intake ports port matched for my Cyclone, but am I forgetting anything?  I'm sticking with the 1G Green top CAS and stock 1G M/T Cams until I get back from NC and then I'm gonna go with some Delta regrinds.   

So basically, this is a "How did you like swapping from a 6 bolt head to a 2G head and am I forgetting anything that needs to be done to bolt it onto my 6 bolt" thread. 
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91 Auto GSX - Fully Ported Evo 3 16G, 660cc injectors, Walbro 255 HP rewired, VRSF FMIC with 2.5" piping, GM 3 Bar map, Jackal, AEM Wideband, 2G pistons on 1G rods w/ARP rod studs, Cyclone IM, custom COP, 3" turboback exhaust, custom shift box, NGR Type S, stock FPR, GT exhaust manifold.

lcrivers816

  • Member
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  • Posts: 11
    • 1988
    • Other
    • Motor: 4G63 2.3L (stroked)
    • Head: 2G (small ports)
    • Turbo: HX-40 PRO
Re: 2G Head on a 1G
« Reply #1 on: February 04, 2011, 09:16:33 AM »
It's not that the 2g head flows more, the ports are shaped so that they flow better (increased intake velocity) so you port matching the cyclone head would most likely ruin how the 2g head flows because you are just putting it back to how the 1g port was shaped, but its up to you. I would just get either a 2g intake manifold or an evo III intake manifold or upgrade completely to a sheet metal intake manifold. You are right about enlarging the head stud holes though.
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Kapok6

  • WEREWOLF Owner
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  • Posts: 283
  • 'ello poppet
    • 1991
    • Talon TSI AWD
    • Motor: 4G63 2.0L
    • Head: 2G (small ports)
    • Turbo: FP3065
Re: 2G Head on a 1G
« Reply #2 on: February 04, 2011, 10:38:57 AM »
Porting the intake ports completely defeats the point of having a 2g head.  PLEASE PLEASE PLEASE don't port the intake ports.

Luis is right, the smaller intake ports are supposed to equate to higher velocity, higher velocity means more efficient filling of the cylinder.  Every Evo since the Evo 3 has had the small intake ports...there is a reason for that...
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1991 Eagle Talon TSi AWD-Ross 8:3.1 pistons, Eagle rods, ACL Race bearings, 2g small port head, HKS/Delta 272 cams, Evo springs/retainers, FP3065 @ 28psi (hopefully), FIC 1550's, Apex'i N1 turbo back exhaust, KYB GR-2's on Suspension Technnique springs, megan sturt bars, poly mounts/bushings

CrackedDSM

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  • Posts: 148
    • 91
    • Eclipse GSX
    • Motor: 4G63 2.0L
    • Head: 1G (large ports)
    • Turbo: Evo 3 16G
Re: 2G Head on a 1G
« Reply #3 on: February 04, 2011, 12:01:43 PM »
Ah okay guys, thanks.  I'll save the 2G head for my G4CS build.  I'll throw a 2G SMIM on it.   Or I might sell it, still not sure.  I really..really like my Cyclone, but I love the thought of an Evo 3 IM too.  Ah well, either way I'll make some money, or some power. 


Thanks for the info, guys!
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91 Auto GSX - Fully Ported Evo 3 16G, 660cc injectors, Walbro 255 HP rewired, VRSF FMIC with 2.5" piping, GM 3 Bar map, Jackal, AEM Wideband, 2G pistons on 1G rods w/ARP rod studs, Cyclone IM, custom COP, 3" turboback exhaust, custom shift box, NGR Type S, stock FPR, GT exhaust manifold.

Kapok6

  • WEREWOLF Owner
  • *
  • Posts: 283
  • 'ello poppet
    • 1991
    • Talon TSI AWD
    • Motor: 4G63 2.0L
    • Head: 2G (small ports)
    • Turbo: FP3065
Re: 2G Head on a 1G
« Reply #4 on: February 07, 2011, 07:16:12 AM »
No prob man.  I just ask that you sell it before you port it.  Shoot I would be willing to trade you a 1g head for a 2g head inf you want the big intake ports that bad ha ha.
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1991 Eagle Talon TSi AWD-Ross 8:3.1 pistons, Eagle rods, ACL Race bearings, 2g small port head, HKS/Delta 272 cams, Evo springs/retainers, FP3065 @ 28psi (hopefully), FIC 1550's, Apex'i N1 turbo back exhaust, KYB GR-2's on Suspension Technnique springs, megan sturt bars, poly mounts/bushings

CrackedDSM

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  • Posts: 148
    • 91
    • Eclipse GSX
    • Motor: 4G63 2.0L
    • Head: 1G (large ports)
    • Turbo: Evo 3 16G
Re: 2G Head on a 1G
« Reply #5 on: February 07, 2011, 08:05:24 AM »
Hahahaa, no worries man.  I'm not going to port it.  Realistically I was never going to port it anyway, but I wanted to check just to see if I could.  I might honestly sell this 2G head, because I still need a good exhaust manifold and 02 housing.  I dunno, we'll see if anyone ever offers a trade or to buy it.   
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91 Auto GSX - Fully Ported Evo 3 16G, 660cc injectors, Walbro 255 HP rewired, VRSF FMIC with 2.5" piping, GM 3 Bar map, Jackal, AEM Wideband, 2G pistons on 1G rods w/ARP rod studs, Cyclone IM, custom COP, 3" turboback exhaust, custom shift box, NGR Type S, stock FPR, GT exhaust manifold.

Kapok6

  • WEREWOLF Owner
  • *
  • Posts: 283
  • 'ello poppet
    • 1991
    • Talon TSI AWD
    • Motor: 4G63 2.0L
    • Head: 2G (small ports)
    • Turbo: FP3065
Re: 2G Head on a 1G
« Reply #6 on: February 07, 2011, 08:26:00 AM »
I have an aftermarket o2 sensor housing with a dump tube I am looking to get rid of...
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1991 Eagle Talon TSi AWD-Ross 8:3.1 pistons, Eagle rods, ACL Race bearings, 2g small port head, HKS/Delta 272 cams, Evo springs/retainers, FP3065 @ 28psi (hopefully), FIC 1550's, Apex'i N1 turbo back exhaust, KYB GR-2's on Suspension Technnique springs, megan sturt bars, poly mounts/bushings

hakcenter

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  • Posts: 1047
    • 2006
    • Other
    • Motor: 4G63 2.0L
    • Head: 1G (large ports)
Re: 2G Head on a 1G
« Reply #7 on: February 07, 2011, 06:26:50 PM »
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AMP 2 Corinthians 8:21
For we take thought beforehand and aim to be honest and absolutely above suspicion, not only in the sight of the Lord but also in the sight of men.

1g20g

  • JACKAL Owner
  • *
  • Posts: 147
    • 1991
    • Talon TSI AWD
    • Motor: 4G63 2.0L
    • Head: 2G (small ports)
    • Turbo: 20g
Re: 2G Head on a 1G
« Reply #8 on: February 22, 2011, 06:49:56 PM »
That link want let me in?
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k272s, eagle rods, mahle pistons, 2ghead, BC springs and retainers, 2g intake, ported 2g mani, arp head and main studs, BS removed. good ol 20g

hakcenter

  • dev team
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  • Posts: 1047
    • 2006
    • Other
    • Motor: 4G63 2.0L
    • Head: 1G (large ports)
Re: 2G Head on a 1G
« Reply #9 on: February 22, 2011, 07:01:09 PM »
???
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AMP 2 Corinthians 8:21
For we take thought beforehand and aim to be honest and absolutely above suspicion, not only in the sight of the Lord but also in the sight of men.

1g20g

  • JACKAL Owner
  • *
  • Posts: 147
    • 1991
    • Talon TSI AWD
    • Motor: 4G63 2.0L
    • Head: 2G (small ports)
    • Turbo: 20g
Re: 2G Head on a 1G
« Reply #10 on: February 22, 2011, 07:05:54 PM »
Quote from: hakcenter on February 22, 2011, 07:01:09 PM
???

Says its missing or off limit to me HAHa i just threw mine on my studs beat it down with a 5lb hammer and called it a day still need a intake! Anyone got a evo 3. :deadhorse
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k272s, eagle rods, mahle pistons, 2ghead, BC springs and retainers, 2g intake, ported 2g mani, arp head and main studs, BS removed. good ol 20g

CrackedDSM

  • Banned
  • ***
  • Posts: 148
    • 91
    • Eclipse GSX
    • Motor: 4G63 2.0L
    • Head: 1G (large ports)
    • Turbo: Evo 3 16G
Re: 2G Head on a 1G
« Reply #11 on: February 22, 2011, 07:26:22 PM »
I don't have an Evo 3, but I'll trade you my spare 2G head in mint condition for your 20G.   :P
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91 Auto GSX - Fully Ported Evo 3 16G, 660cc injectors, Walbro 255 HP rewired, VRSF FMIC with 2.5" piping, GM 3 Bar map, Jackal, AEM Wideband, 2G pistons on 1G rods w/ARP rod studs, Cyclone IM, custom COP, 3" turboback exhaust, custom shift box, NGR Type S, stock FPR, GT exhaust manifold.

1g20g

  • JACKAL Owner
  • *
  • Posts: 147
    • 1991
    • Talon TSI AWD
    • Motor: 4G63 2.0L
    • Head: 2G (small ports)
    • Turbo: 20g
Re: 2G Head on a 1G
« Reply #12 on: February 22, 2011, 07:47:40 PM »
I have a 2g head i was talking about intake manis. :icecream
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k272s, eagle rods, mahle pistons, 2ghead, BC springs and retainers, 2g intake, ported 2g mani, arp head and main studs, BS removed. good ol 20g

Kapok6

  • WEREWOLF Owner
  • *
  • Posts: 283
  • 'ello poppet
    • 1991
    • Talon TSI AWD
    • Motor: 4G63 2.0L
    • Head: 2G (small ports)
    • Turbo: FP3065
Re: 2G Head on a 1G
« Reply #13 on: February 28, 2011, 05:32:21 AM »
Can anyone remember how big the head stud holes on a 2G head need to be drilled out to in order to run on a 6 bolt block?  1/2"?
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1991 Eagle Talon TSi AWD-Ross 8:3.1 pistons, Eagle rods, ACL Race bearings, 2g small port head, HKS/Delta 272 cams, Evo springs/retainers, FP3065 @ 28psi (hopefully), FIC 1550's, Apex'i N1 turbo back exhaust, KYB GR-2's on Suspension Technnique springs, megan sturt bars, poly mounts/bushings

AlphaVision

  • JACKAL Owner
  • *
  • Posts: 89
  • SolarEclipse
    • 1999
    • Eclipse GSX
    • Motor: 4G63 2.0L
    • Head: 1G (large ports)
    • Turbo: FP68HTA
Re: 2G Head on a 1G
« Reply #14 on: February 28, 2011, 06:27:27 AM »
Do you refer to the stud size? 12mm for a 6 bolt
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99 GS body (Euro spec)
97 GSX drivetrain
91 ECU
6 bolt long block

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