DOHC head swap information...finally

59750 Views 45 Replies 21 Participants Last post by Chad, Oct 21, 2017

mysticj

Discussion Starter · Nov 28, 2007 (Edited)

Head swap info:
Compression options

DOHC head swap parts list

2.4 block and Evo head(Misc)

Cams:
Cams Choices

Evo 8 vs JDM Evo8 MR

Cam Selection
Cam selection for turbo setup have been covered. Cam selection for a NA setup has not. Here is a suppose setup:

Min.
260/264 [Stock, Tomei, HKS, or Jun]
A combination proven in the Mitsu Galant Tuned by AMG.
Degree the intake to 18 open/62 close; degree the exhaust to 63 open/21 close to mimic valve timing of the cams use in the galant tuned by amg. For slightly more top end, mimic the valve timing of the jdm evo 8 mr intake by degreeing it to 17 open/63 close.

268/272 (more like the above just more duration, good for a 2.4L[GSC S1 or Kelford 264]
272/264(the norm)
272/280(max for a street/strip setup)

Setting cam timing:
Option 1

Option 2

4G69 Info:
*The 4G69 is simply a 4G64 with 87mm bore and a deck height of a 4G63, interesting parts may be use to swap over such as lightened crank, rods, and crankshaft pulley, as well as use of the lower compression height pistons to use with a longer rod to increase the rod ratio thus allowing the 100mm stoke to rev higher. More details inside.
FYI

Tranny Information
Evo 4-7 tranny info
Evo 8 and Evo 8 MR tranny info
4G69

Where to Buy Parts
Hyundai OEM Parts
Hyundai OEM Parts2
Mitsu OEM Parts

See less See more

Reactions: 2

1 - 20 of 46 Posts

mysticj

Discussion Starter · #2 · Dec 5, 2007 (Edited)

Headers For N/A Applications
4-2-1
Headers for the G4JS head and 4G63
K-Spec 4-2-1
K-Spec GT
DC Sports 4-2-1
OBX Racing 4-2-1

It's also possible to modified the Fed Spec header by adding a taper collector

4-1
RPW Race
RPW Street
OBX

ECU Tuning
ECU Flashing
ECU ROMS

See less See more

Reactions: 1

crpearce

· #3 · Dec 11, 2007

Good job on compiling all of this information.

mysticj

Discussion Starter · #4 · Dec 13, 2007

thanks. i will update/add more information as the swap become more popular or come across more detail information.

mysticj

Discussion Starter · #5 · Dec 22, 2007 (Edited)

More...

Cylinder Heads

Hyundai Sirius engines
G4JS Sirius I/II(1999-2005)

Mitsu Sirius engines
4G63 (2003-2005 US Evo VIII; JDM Evo 4-7)
4G63 (2006-2007 Evo IX, MIVEC)

kidney_bean

· #6 · Dec 22, 2007

mysticj said:
Cylinder Heads

Hyundai Sirius engines
G4JS (1999-2005)
G4JS Sirius II*
G4CP (99-00, 01-06)[With and W/O the CVVT feature]*

Mitsu Sirius engines
4G63 (2003-2005 US Evo VIII; JDM Evo 4-7)
4G63 (2006-2007 Evo IV, MIVEC)*

*Unknown at this time if cylinder head will bolt up to engine block

I think you meant 2006-2007 Evo IX...:bigthumb:

mysticj

Discussion Starter · #7 · Dec 28, 2007

it was a typo:quiver:

kidney_bean

· #8 · Dec 28, 2007

mysticj said:
it was a typo:quiver:

I figured as much...

cyberbrain

· #9 · Dec 28, 2007

is it possible to keep cruise control with the DOHC conversion?

FlashBlueRS

· #10 · Dec 28, 2007

Use the Outlander throttle body instead of the EVO.

cyberbrain

· #11 · Dec 28, 2007

thanks flash.

crazy_ugly_co

· #12 · Dec 28, 2007

Is there a confirmation on whether the 300GT tranny will bolt up? Are there and advantages with that gear box?

bluebomber

· #13 · Jan 1, 2008

I had read somewhere that there are holes that need to be plugged up in the block when doing the swap but from what I can tell it looks like that is not the case. I figured this would be a good place to post this question.

FlashBlueRS

· #14 · Jan 1, 2008

bluebomber said:
I had read somewhere that there are holes that need to be plugged up in the block when doing the swap but from what I can tell it looks like that is not the case. I figured this would be a good place to post this question.

That's only for swaps done on 2G eclipses. Nothing needs to be blocked or plugged with the 3G head swaps.

bluebomber

· #15 · Jan 1, 2008

Heres another one, If using the 94 galant dohc timing belt do you still need to use adj. cam gears?

FlashBlueRS

· #16 · Jan 1, 2008

bluebomber said:
Heres another one, If using the 94 galant dohc timing belt do you still need to use adj. cam gears?

Someone mentioned that you won't have to, but his timing appeared to be off. I would get the Evo8 timing belt and gears. It'll allow you to take full advantage of the DOHC head by being able to tune the intake and exhaust independently. Prosteetonline has cam gears at a great price and evo8 timing belts for less than $30 when they are in stock.

TheBlckFalcon

· #17 · Jan 2, 2008 (Edited)

I have a question, what about 2000 ECU guys? I know I'm not 2000, but I'd hate not to leave those guys out. Just compile info for them if necessary.

Here's the info I found, not trying to contribute for e-rep, but I think this thread will help.
http://www.club3g.com/forum/eclipse-performance/85079-2000-ecu-reflash.html

Reactions: 1

bd3g5

· #18 · Jan 4, 2008

TheBlckFalcon said:
I have a question, what about 2000 ECU guys? I know I'm not 2000, but I'd hate not to leave those guys out. Just compile info for them if necessary.

Here's the info I found, not trying to contribute for e-rep, but I think this thread will help.
http://www.club3g.com/forum/eclipse-performance/85079-2000-ecu-reflash.html

Thank you. :twothumb:

G-clipse

· #19 · Jan 5, 2008

dou you lose a/c or power steering with the swap

kidney_bean

· #20 · Jan 5, 2008

G-clipse said:
dou you lose a/c or power steering with the swap

I'm sure others would rather chastise you first, but since this is your first post I'll be nice...:bigthumb:

There are actually quite a few threads covering this topic in great detail. Click on the word Search up at the top right and then type in various things you'd like to know about. Searching through the various threads before you ask questions helps us from having to answer the same questions over and over...

In answer to your question though, I wouldn't think so, but I haven't done the swap...which I why I recommend you search to see if that's been covered. I know there is a thread with a complete parts breakdown on what is needed...

1 - 20 of 46 Posts

This is an older thread, you may not receive a response, and could be reviving an old thread. Please consider creating a new thread.