4G64 DOHC Hybrid - 4g63 head 4g64 block

[DSMLIFE]

I know this thread has been posted many times but I only have a question regarding the timing tensioner and belt. I'm using the 64 block, oil pump, water pump and oil filter housing. This tensioner is the manually adjustable one and not the hydraulic one. I don't think the 63 oil pump works with this block because the gasket won't work. Does anybody know what bracket I'm missing? I have only the 1 tensioner and no other pulley near it. I bought the dohc galant belt but that belt won't work with the 64 oil pump sprocket but the 63 sprocket rubs against the block if used. I'm at a loss as far as what to do next.

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[DSMPT]

Somehow you have a G62B/63B bottom end (or components), it's not a 4g64. That's why the belt rubs.

 

[DSMLIFE]

Pardon the stupidity but what's the difference? I've never heard of that motor

 

[DSMPT]

G62B/G63B are older model of the 4g6 from the early 80s. I don't know the history of your engine so can't tell which components exactly you have. But I can tell is, the front case looks very similar to 4g6 but oil pump gears, sprocket are thinner (belt width is narrower) than 4g6's. That's why the 4g6 dohc belt would rub. Also all tensioner components are different from 4g6.

 

[DSMLIFE]

Okay I actually have the narrower oil pump gear but the belt that's on it won't run on it because the belt is too wide. The gear in pic is from a 98 4g63.

Do you know what vehicles these motors came in? Like older vans or trucks?

 

[DSMPT]

Did you build the engine/install the DOHC head by yourself? Or you bought the engine being like this?

The gear in pic is from a 98 4g63. Do you know whT vehicles these motors came in? Like older vans or trucks?

You mean the oil pump sprocket? If so, I am not so sure if you can use a 4g6 oil pump sprocket on a G62/63B oil pump gear, since the original oil pump sprocket is narrower, you may not have enough thread left to torque the oil pump sprocket nut.

 

[DSMLIFE]

I got the block completely dissambled and put the dohc head and have put the motor together so far. The guy I got it from said it came out of a mighty max supposedly.

Yea the oil pump sprocket, my bad. The one that I got with it bolts on and spins no problem, it's just too narrow for the belt needed for this dohc gears

 

[DSMPT]

Are you planning to use this engine in a DSM? You should make sure before installing if this block fits with the transmission you will use.

The one that I got with it bolts on and spins no problem, it's just too narrow for the belt needed for this dohc gears

You shouldn't replace only the oil sprocket and crank sprocket. As I mentioned above that you probably won't have enough threads to torque the oil pump sprocket nut. That nut is important. And even if you can, the point is not only the oil pump sprocket. You would need to use 4g6 components otherwise the belt width and tensioner pulley width/position won't match, also you can't put the tension since the belt routing is different.
I can't tell if this would be possible in your case but I think the best way for your case is to use a 4g6 front case, oil pump gears and all tensioner components if you want to use the DOHC head.

 

[Tiny truck ryan]

G62B/G63B are older model of the 4g6 from the early 80s. I don't know the history of your engine so can't tell which components exactly you have. But I can tell is, the front case looks very similar to 4g6 but oil pump gears, sprocket are thinner (belt width is narrower) than 4g6's. That's why the 4g6 dohc belt would rub. Also all tensioner components are different from 4g6.

So before I go any further with my Mighty Max build, is possible to put a DOHC on my 1987 MM 4g63 block that is set up for RWD?

I wanted to order a stoker crank and pistons. I have seen info on 4g64 block to 63 DOHC. Is my 1987 block the same as a 1990 eclipse talon etc?

 

[DSMPT]

is possible to put a DOHC on my 1987 MM 4g63 block that is set up for RWD?

Is my 1987 block the same as a 1990 eclipse talon etc?

Please refer the link below in case if you haven't check it yet. That site would probably answer most of your questions.

:: Project Zero G ::

projectzerog.com

I wanted to order a stoker crank and pistons. I have seen info on 4g64 block to 63 DOHC.

I am a bit confused. Do you want a DOHC 4g64, SOHC g63b to DOHC or 4G63 stroker? Or something else?

 

[Tiny truck ryan]

Hey sorry first post on this forum any advice for my MM build would be appreciated I’m looking to

Please refer the link below in case if you haven't check it yet. That site would probably answer most of your questions.

:: Project Zero G ::

projectzerog.com

I am a bit confused. Do you want a DOHC 4g64, SOHC g63b to DOHC or 4G63 stroker? Or something else?

So I have a 1987 4g63 Mighty Max RWD block, is it the same as the 1990 Eclipse/Talon?
Could I put a DOHC head on this block?
Does a DOHC head match the MM block like it matches the 4g64 as I have read on the forum?

As of now my crankshaft is shot, will the Eagle forged 94mm stroker crank for the 1990 Eclipse work? Just trying to skip making a FWD block a RWD one.

 

[DSMPT]

so I have a 1987 4g63 mighty max rwd block is it the same as the 1990 eclipse talon.

As of now my crankshaft is shot, will the eagle forged 94mm stroker crank for the 1990 eclipse work.

You may have a g63b wide block, dsm's is a narrow 4g63 block. but yes, the crank should be the same. So either a 88mm, 94mm or 100mm crank can be used. Just keep in mind if you plan to buy a new crank that there are 2 types, 6 bolt and 7 bolt. Just count how many flywheel bolt your old crank has.

Could I put a dohc on this block.

Supposed to be yes. But can't tell what mods you would exactly need for the RWD spacing/layout.

 

[Tiny truck ryan]

Thank you for you response. I actually just came across an old thread from 2016 and also confirmed yes on head swap. I am pretty sure it’s a narrow block and is definitely a six bolt. It’s currently at my machine shop getting block cleaned up. Plan b was to swap a jdm 4g63t cyclone…any thoughts

Thank you for you response. I actually just came across an old thread from 2016 and also confirmed yes on head swap. I am pretty sure it’s a narrow block and is definitely a six bolt. It’s currently at my machine shop getting block cleaned up. Plan b was to swap a jdm 4g63t cyclone…any thoughts

Still going to build the original motor for future projects

 

[Diamond Star Werks]

In the Mighty Max 2.4L engine family there are two different blocks. Wide blocks and narrow blocks. Wide blocks will not work for a DSM. Normally you would build a 2.4L from a 2.4 Spyder for 2g 7 bolt or g4cs for 6bolt cars. Besides aforementioned issues the bracket I see missing in your photo is the idler bracket.

What chassis are you trying to put this in? Your Mighty Max? Knowing what your going to do with it will help determine some of the parts you'll need for install. For example all the parts on the back of a DSM engine will not fit behind that same engine when installed RWD in a mighty max as there will be no room between the engine and firewall to clear the thermostat assembly and cam sensor. You'll need to move the engine forward or come up with a different solution for the thermostat, coolant pipe, and heater hoses. The DSM intake will be facing the wrong way and can also interfere with the brake booster.

6 bolt cranks with interchange with all 6 bolt cranks, 7 bolt cranks interchange with all 7 bolt cranks. Regardless if its a gas or diesel block as they are all in the same engine family. You'll need to make sure your piston and rod combo will work when swapping into other engines.

You should be able to DOHC swap any narrow block 4G6X

See the bracket in the center that your missing, this is also the front engine mount bracket for a DSM. P.S. The idle pulley on this engine is custom, the factory one you're looking for is 60mm.

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[DSMPT]

I am pretty sure it’s a narrow block and is definitely a six bolt.

Anyways, you should measure the width to make sure before buying another block just for in case.

Plan b was to swap a jdm 4g63t cyclone…any thoughts

The JDM Cyclone 4g63 itself is just a 6 bolt 4g63 with a Cyclone intake manifold that is controlled by a JDM ECU (The late Galant VR4 has revised pistons though). But if your car is RWD, you can't use the Cyclone intake manifold. The intake manifold inlet position would be in opposite side. So I think there is no point to buy specifically a JDM Cyclone engine for your project. Find one from DSM in the US would probably cheaper.