Mighty Max DOHC swap

[Keegan Johnson]

Hey guys. Got a friend who just bought a Mighty Max with a 4g64. Planning on helping him make it DOHC and turbo.

I have a 4g61 head that came from a "4g63" from a shady place I shouldn't have bought from haha. I know it will bolt up, but not sure what T Belt I need. Same as a 63 head swap I assume? Just want to double check and see if anyone has done this who has any advice.

I figure the 61 head would bump up compression, which would be good, at least for now. Anyone know what the compression would be? I'm going to be going Evo 3 whenever I get around to finishing mine, and then we might put the little stocker on the MM.

So i feel maybe i should have him get an EPROM ECU now rather then later. Can this be done with some simple repinning? Planning on using my stock turbo 63 cams as I put BC 272s in my fresh 6 bolt.

Anything else i should be aware of or plan for before tearing into this? Thanks guys!

 

[deleted]

Compression will be about 13:1 with the flat-top 2v pistons and an OEM headgasket. You can get cast dished pistons for the SOHC 4v engines to bring that down to 10.5:1, and with a 1.2mm headgasket as well, it comes out to about 9.8:1.

Timing gear is the same as with the 4g63 head; you want a kit for the 1994 2.4L DOHC Galant.

 

[mitsubishikid]

I'll save you even more time, just get a cylinder head for 98 to 05 Hyundai Sonata, 00 to 04 Kia Optima, Kia Sorento 02 to 09 Hyundai Santa Fe 01 to 05. They are basically a clone of the Evo only no Evo tax , then use an Evo exhaust manifold and turbo. If your friends truck is a 6 bolt you might have to drill the head bolt holes bigger for the larger 6 bolt head studs.

Also you have to change the front timing cover to a DOHC one, in order to use the tensioner setup for the DOHC motor.

 

[deleted]

I'll save you even more time, just get a cylinder head for 98 to 05 Hyundai Sonata, 00 to 04 Kia Optima, Kia Sorento 02 to 09 Hyundai Santa Fe 01 to 05. They are basically a clone of the Evo only no Evo tax , then use an Evo exhaust manifold and turbo.

You can't use the G4JS head with Evo manifolds in a RWD application without quite a bit of work. The turbo ends up pointing backwards, and the bolt pattern isn't reversible on the Evo the way it is on the DSM.

My suggestion is stock block, 2G head, G4JS intake manifold, and Evo 8 exhaust manifold, turbo, and O2 housing. This way, everything more or less bolts up (just a bit of drilling and tapping, no cutting and welding) and the intake and exhaust end up on the original sides so the exhaust routing is already figured out and you don't have to worry about the turbo heat soaking your hydraulics.

 

[brian9397gsx]

Also as far as electronics goes get a 1g turbo harness. The stock Mighty Max wont have all the wiring necessary for knock sensor cmp and coil.

Have you checked out Project Zero G? Lots of RWD conversion information there.