Help from you Boosted SOHC peeps - Club3G Forum : Mitsubishi Eclipse 3G Forums

UglySleeper · 01/03/2013, 10:52 AM

Ok i have bought the kia dohc head already..

The question I have is I just want about 300-350 whp out of my engine just for DD and a little fun could I get that from just rebuilding the engine and keeping the sohc with a evo 8 turbo?

I know I will need supporting mods such as fuel,tune,stuff like that because anymore power for a DD would be useless unless awd or driving on slicks...

I just want you input thanks..

CloudINC00 · 01/04/2013, 01:49 AM

For DD just leave it SOHC but note that theres a chance you'll lose a/c. It depends on your budget

Jonny03GT · 01/04/2013, 08:02 PM

Don't the stock SOHC take boost better
than the DOHC kia heads though?

obviously the evo head is built for psi,
but i could swear i remember that stock
heads are better unless you build internals too.

01GtCRazyKid · 01/04/2013, 09:27 PM

i dont know how it would be better or worse? The Kia/Hyundai head actually have a bigger combustion chamber than the Evo's. over on evom there have been a few guys who actually went and built a Hyundai head with stock evo internals. I did the DOHC swap since my timing belt jumped timing on me. i have evo8 valves, springs, retainers. with the Hyundai Cams since iwas not turbo'd at the time. just recently i turbo'd and ran the Hyundai cams for the first 1k miles and they worked just fine. since then i have swapped over to the evo8 OEM cams.

XwP1ayawX · 01/05/2013, 04:22 PM

I love my DOHC. Haven't regretted anything. I was sick of breaking intake manifolds with the foolish TB flange. The DOHC runs great, and the parts are cheap. I landed a set of BC 272's on evom for 150 bucks... Seriously. My RPW cam goes for 600 for my SOHC, and you still are stuck with a smaller head and a shit manifold.

01GtCRazyKid · 01/05/2013, 04:27 PM

Quote:

Originally Posted by XwP1ayawX

I love my DOHC. Haven't regretted anything. I was sick of breaking intake manifolds with the foolish TB flange. The DOHC runs great, and the parts are cheap. I landed a set of BC 272's on evom for 150 bucks... Seriously. My RPW cam goes for 600 for my SOHC, and you still are stuck with a smaller head and a shit manifold.

this is true the DOHC intake manifold flows way better. but i still dont get why the stock mani cracks for some people?

XwP1ayawX · 01/05/2013, 06:28 PM

Quote:

Originally Posted by 01GtCRazyKid

this is true the DOHC intake manifold flows way better. but i still dont get why the stock mani cracks for some people?

Solid mounts, big clutch, stiff suspension did it for me

UglySleeper · 01/06/2013, 11:15 PM

I figured I would do a dohc swap later on down the road but thanks for all the replys I'm getting my order ready for building the short block I emailed RRE to find out what piston they suggest to run since I will be staying sohc right now I'm ordering 7 bolt Manley h beams with acl race 6 bolt bearings due to the fact Manley is one of the lightest h beam rods available does anyone have any advice on piston selection ?
Thanks

XwP1ayawX · 01/07/2013, 12:49 AM

Je. there's rod and piston kits on ebay for the swap

CloudINC00 · 01/11/2013, 03:04 AM

Quote:

Originally Posted by XwP1ayawX

Je. there's rod and piston kits on ebay for the swap

Oh? Someone once gave me a part number for the rod and piston kit for the swap but when I took it to the machine shop, they said it wouldn't work. I'm sure I got the wrong part. Which are you talking about?

And people are right, according to what I've read (as I've only had experience with SOHC and a build SOHC) is Kia > Stock > EVO as far as flow.

I wish there were better intake manifold options for the SOHC, I've already cracked two

01GtCRazyKid · 01/11/2013, 03:35 AM

just weld the seams of the stock intake manifold. hell i think i still have my stocker i can weld all the seams up.

CloudINC00 · 01/11/2013, 04:08 AM

Quote:

Originally Posted by 01GtCRazyKid

just weld the seams of the stock intake manifold. hell i think i still have my stocker i can weld all the seams up.

Yeah I'll have to do that on my spare. One manifold didnt crack at the seam though

01GtCRazyKid · 01/11/2013, 04:22 AM

post or send me a pic of where it cracked. tomorrow when i get off work i am going to weld up my old stocker and see if anyone of the boosted guys wants to buy it.

XwP1ayawX · 01/11/2013, 10:42 AM

Quote:

Originally Posted by CloudINC00

Oh? Someone once gave me a part number for the rod and piston kit for the swap but when I took it to the machine shop, they said it wouldn't work. I'm sure I got the wrong part. Which are you talking about?

And people are right, according to what I've read (as I've only had experience with SOHC and a build SOHC) is Kia > Stock > EVO as far as flow.

I wish there were better intake manifold options for the SOHC, I've already cracked two

Well the rods are the same regardless, and I'm using JE pistons I bought off an egay vendor. 86.5mm was .020 over I believe.

XwP1ayawX · 01/11/2013, 10:47 AM

Je Pistons 93 Up 4g64 Block 4g63 Head 87 5mm Bore 8 5 | eBay

Those should work with any 4g63 rod

CloudINC00 · 01/15/2013, 12:19 AM

Quote:

Originally Posted by XwP1ayawX

Je Pistons 93 Up 4g64 Block 4g63 Head 87 5mm Bore 8 5 | eBay

Those should work with any 4g63 rod

Thanks

UglySleeper · 01/19/2013, 11:09 PM

Thanks for the link for the pistons RRE emailed me back and said call them they got pistons in stock that would work didn't even tell me much i guess its there custom piston prolly from weisco or something ....

Sent from my Galaxy Nexus using AutoGuide.Com Free App

Lil Mitsu · 01/19/2013, 11:20 PM

I don't know much about this stuff, but I found these..

DSM EVO Eclipse Talon Turbo 4G63T Ross Racing Pistons Eagle H Beam Rods | eBay

01/03/2013, 10:52 AM	#1 (permalink)
UglySleeper Junior Member Join Date: Dec 2012 Posts: 13	Help from you Boosted SOHC peeps Ok i have bought the kia dohc head already.. The question I have is I just want about 300-350 whp out of my engine just for DD and a little fun could I get that from just rebuilding the engine and keeping the sohc with a evo 8 turbo? I know I will need supporting mods such as fuel,tune,stuff like that because anymore power for a DD would be useless unless awd or driving on slicks... I just want you input thanks..

01/04/2013, 01:49 AM	#2 (permalink)
CloudINC00 GS-Turbooo Join Date: Sep 2005 Location: Jacksonville, FL Vehicle: 2003 Eclipse GS-T Posts: 2,440	For DD just leave it SOHC but note that theres a chance you'll lose a/c. It depends on your budget __________________ [ 2003 GS-T \| 2001 GS-T Spyder ]

01/19/2013, 11:09 PM	#17 (permalink)
UglySleeper Junior Member Join Date: Dec 2012 Posts: 13	Re: Help from you Boosted SOHC peeps Thanks for the link for the pistons RRE emailed me back and said call them they got pistons in stock that would work didn't even tell me much i guess its there custom piston prolly from weisco or something .... Sent from my Galaxy Nexus using AutoGuide.Com Free App

01/04/2013, 08:02 PM	#3 (permalink)
Jonny03GT I wanta6G75TDiamante Join Date: Feb 2011 Location: PA Vehicle: 6G74 swap Posts: 222	Don't the stock SOHC take boost better than the DOHC kia heads though? obviously the evo head is built for psi, but i could swear i remember that stock heads are better unless you build internals too.

01/04/2013, 09:27 PM	#4 (permalink)
01GtCRazyKid Senior Member Join Date: Feb 2008 Location: San Diego Vehicle: 03 Eclipse GS-T Posts: 495	i dont know how it would be better or worse? The Kia/Hyundai head actually have a bigger combustion chamber than the Evo's. over on evom there have been a few guys who actually went and built a Hyundai head with stock evo internals. I did the DOHC swap since my timing belt jumped timing on me. i have evo8 valves, springs, retainers. with the Hyundai Cams since iwas not turbo'd at the time. just recently i turbo'd and ran the Hyundai cams for the first 1k miles and they worked just fine. since then i have swapped over to the evo8 OEM cams.

01/05/2013, 04:22 PM	#5 (permalink)
XwP1ayawX GT35 Monster Join Date: Aug 2005 Location: Space Vehicle: V-ROD, R6, GST Posts: 10,276	I love my DOHC. Haven't regretted anything. I was sick of breaking intake manifolds with the foolish TB flange. The DOHC runs great, and the parts are cheap. I landed a set of BC 272's on evom for 150 bucks... Seriously. My RPW cam goes for 600 for my SOHC, and you still are stuck with a smaller head and a shit manifold.

01/06/2013, 11:15 PM	#8 (permalink)
UglySleeper Junior Member Join Date: Dec 2012 Posts: 13	I figured I would do a dohc swap later on down the road but thanks for all the replys I'm getting my order ready for building the short block I emailed RRE to find out what piston they suggest to run since I will be staying sohc right now I'm ordering 7 bolt Manley h beams with acl race 6 bolt bearings due to the fact Manley is one of the lightest h beam rods available does anyone have any advice on piston selection ? Thanks

01/07/2013, 12:49 AM	#9 (permalink)
XwP1ayawX GT35 Monster Join Date: Aug 2005 Location: Space Vehicle: V-ROD, R6, GST Posts: 10,276	Je. there's rod and piston kits on ebay for the swap

01/11/2013, 03:35 AM	#11 (permalink)
01GtCRazyKid Senior Member Join Date: Feb 2008 Location: San Diego Vehicle: 03 Eclipse GS-T Posts: 495	just weld the seams of the stock intake manifold. hell i think i still have my stocker i can weld all the seams up.

01/11/2013, 04:22 AM	#13 (permalink)
01GtCRazyKid Senior Member Join Date: Feb 2008 Location: San Diego Vehicle: 03 Eclipse GS-T Posts: 495	post or send me a pic of where it cracked. tomorrow when i get off work i am going to weld up my old stocker and see if anyone of the boosted guys wants to buy it.

01/11/2013, 10:47 AM	#15 (permalink)
XwP1ayawX GT35 Monster Join Date: Aug 2005 Location: Space Vehicle: V-ROD, R6, GST Posts: 10,276	Je Pistons 93 Up 4g64 Block 4g63 Head 87 5mm Bore 8 5 \| eBay Those should work with any 4g63 rod

01/19/2013, 11:20 PM	#18 (permalink)
Lil Mitsu King of Rice!! Join Date: Oct 2010 Location: St. Louis Mo Vehicle: 2003 Eclipse GTS Posts: 1,385	I don't know much about this stuff, but I found these.. DSM EVO Eclipse Talon Turbo 4G63T Ross Racing Pistons Eagle H Beam Rods \| eBay

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