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Is there anyway I can fit this 4g63t head on GDI?

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dephilron

Proven Member
34
0
Sep 5, 2014
Sundsvall, Europe
Hi guys! Maybe not the best forum for this but I need help. I have a really nice european Mitsubishi Galant -01 with the oh so reputable 2.4 DOHC GDI-version of 4g64 with the EGR disabled of course. Has only one previous owner with barely 7000 miles on it. But now It's head cracked this weekend and I would like to fix it up. Now for the question:

I've read about the heads from EVO 4g63t fits bolt on on these engine-models. This specific 4g63t is a gen 2 so it is positioned right at least. I got offered one for free and would really like to know if there is anyway I can use it?

Many thanks!
 
Have anyone even heard of a 4g63t head used with a GDI system at all? If so please share. Otherwise I guess I have to get an ECU and fuel system from a car using MPFI. In that case I really hope it doesn't have to come from an EVO because of the limited availability here in Sweden and tight budget. Would a ECU/MPFI-system from a 4g63 (2.0l) Galant work?
 
As far as i can tell, the blocks are the same bolt pattern. Youd have to block off the oil drain holes and use the appropriate gasket.

Issues i see are pistons and compression ratio. The gdi wouldnt be adaptable to the 4g63 head, so a mpfi retrofit would be needed.

If you cant source another stock head, id say its doable to swap the 4g63 head on, but not feasible to unless you have cash burning a hole in your pocket or a spare car with all the swap stuff. A complete motor swap would be wiser.
 
Well screw GDI then. My plan is a 2.4l 4g64/4g63t, n/a for now at least :) The base I had was the 4G64 GDI-block and it's manual transmission. Both in great condition since the car only one has previous owner and not even 7000 miles on it.

I quickly came over an evo 4 4g63t head and made an impulse buy, a bargain I hope
And since neither the fuel delivery system nor the ECU seems to be of any use I had to search for my next move. My conclusions said the options for ECU either came from an evo or a 3g eclipse. Since the 3g was alot cheaper I again made a fast decision and got it.

So that is right about where we are today. I hope this build is even possible to start with :) Barely know where this is going and have no real idea what the expected end result of this might be, but this is how I learn best. With a limited budget and lack of experience I realize I this is no easy picnic and hope you guys can guide me somewhat.

I know the pistons on this block is and looks alot different from the 4g64 SOHC and has a higher compression ratio(10.5:1). But I've heard they maybe , just maybe the pistons can modified to fit this system. Any suggestions on where I go from here?

Right now I'm thinking of exploring the differences on the wiring harness to make the ECU fit. I have good experience with wiring at least and hope I can modify the existing one to work with the 3g. One of my biggest questions is what, if anything, can I actually keep from the original setup?

I know need a throttle body and fuel injection, and probably intake and exhaust as well right? If so, what might fit, just evo and 3g? I'm guessing the easiest way would be using as many components from a 3g as possible, but that might be both tough to find here and rather expensive.

All thoughts, pointers and help appreciated!
 
Basically, you will need alot of donor parts: intake/exh mani, tb, intake w/ maf, harness, ecu, timing setup etc...
There are alot of parts, and in all honesty, its going to be a pain in the arse that may not even work.

With the piston design, std port fuel injection is going to react poorly, and i believe comoression may be much higher than the 10.5:1. This means either high octane fuel or e85/ the like. Also, I wouldn't "modifiy" the pistons, if anything, get new ones that can be fit to the block/rods so the compression will be adequate for the fuel you intend to use.

If the evo 4-8/3g style cylinder heads will fit the block, you shouldnt have to block off any oil drain back holes.

If you could take some pics of what you have currently and upload them, that would aid in us helping you.
 
Thanks tametalon92! I will post some pictures when I can :)

Already have a 3g ecu and I plan on at least trying to modify existing harness to fit, has been done with a 2.4 SOHC Galant here:
http://www.galanttuners.com/index.php?/topic/639-success-evo3g-ecu-in-a-6th-gen-galant/&page=1

Parts from evo is actually a lot easier to find then from the 3g. I can buy tb, intake mani, exhaust mani and a maf from different evo 4-6, for under $400.

Can I build a cold air intake instead of finding a regular air intake, and would it serve a purpose?

Regarding the pistons I kinda figured it wouldn't be that easy. We do however have both e85 and 98 octane at almost every gas station here in Sweden. How do I figure out what pistons to get?
 
This is how the GDI pistons look like (googled):
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For the intake, you can use antrhing that works, but the maf would be the most crucial piece. Idk what the gdi's have, but you could cross reference part #'s to see if what is on the car will work. If it doesnt have a maf, youll need the appropriate maf.

Pistons, youll need to determine the bore, pin size and compression height. If it truly is a 2.4 block similar to the 4g64, then you could get 3g 2.4 pistons in std bore, or 94 galant pistons, and use a bottle hone to deglaze the cylinders.

This is the short and sweet of it, so make sure you research as much as you can on the current engine you have. Im having a hard time finding much info on the 2.4 gdi engine.
 
After more research I found that the original galant maf is an exact match with 3g so there you go :) I will compare other components between the 3g and galant later and hopefully find more. I also pretty sure the cranks and crankshaft is identical to the sohc galant 2.4. I will double check of course before buying pistons but does it matter if it's for a 3g or a 94 galant? Any suggestions on what kind of pistons, with a limited budget in mind that is :) I believe this might be the biggest expense left along with getting someone to later map and adjust the ecu. Many thanks :)
 
Are there any benefits in aiming on it to run on e85, and if so what? There is a big chance a will turbo it at some point if all goes well.
 
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