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Old Aug 15, 2006, 05:54 PM   #1
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4g69/4g63 Compatibility question.

Ok here it goes. Does the 4g69 (2.4L Mivec from the RA) and the 4g63 (Evo Engine) share the same block? I heard this from a couple of friends, they told me that basically the lower part of both engines are the same except for the bore. This could mean we could share internals parts with Evo. Personally i have my doubts about this and wanted to confirm with you guys. Next week i am going to my dealer and i will ask for the head gasket p/n of both engiens, if its the same, well the there is no doubt. If someone know anything about this pleas let me know. Thanxs!!!
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Old Aug 15, 2006, 06:47 PM   #2
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Old Aug 15, 2006, 06:50 PM   #3
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actually when i was workin at DTM motorsports the tuner looked at my engine and said that the block is pretty much the same as the Evo
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Old Aug 15, 2006, 09:00 PM   #4
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There closer than most believe, or shall I say, than most want to believe, read the quote...
Quote:
Originally Posted by Alliedcries
The only thing I don't like about the 4G69 is that the block height is 6mm shorter than the 4G64. This brings the block height back to the same as the EVO 4G63. The 4G69 uses the same length rods as the EVO with a longer stroke of 100mm. EVO pistons, even forged ones can be used in the 4G69. However, these pistons need to be 87mm. That's the only downside. The solution is to get stroker pistons for the EVO in 87mm. 87mm pistons for an EVO, however, are not easily sourced. They more than likely would have to be made custom by JE, Wiseco, Arias, etc.

4G69 uses 4G63 rod and crank bearings (old news)
4G69 uses 4G64, 4G94 valve guides and seals
4G69 uses the EVO timing belt tensioner which is aluminum, not cast iron
4G69 intake valve = 34mm (4G63 EVO = 34mm) May fit?
4G69 exhaust valve = 30.55mm (4G63 EVO = 30.5mm) May fit?
4G69 uses 4G64, 4G94 valve spring retainers
4G69 uses 4G63, 4G64 head bolts (can use 4G63 ARP head studs )
4G69 uses 4G63, 4G64 main bolts (can use 4G63 ARP main studs )
4G69 uses 4G63 EVO balance shafts (can use 4G63 EVO BS eliminator kit )

Nothing spectacular, I know. Every little bit helps though. Here's a good read on how Mitsubishi took a 4G64, modified it and called it a 4G69: Article (http://www.theautochannel.com/news/2...14/253444.html). Lightened rods, lightened crank, lightened crank pulley, larger valves, shorter block height and other goodies. They did a very nice job and came out with a very nice engine.

I Know that Eagle just released a 100mm stroker kit for the Evo/ Eclipse. Something you might want to look into.
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Old Aug 15, 2006, 09:27 PM   #5
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here is a real question for you to ask is the gearbox for the 4g63 the same as the 4g69 or rather can you use the 63 on a 69... ( I know one is FWD and the other AWD but can it be done)
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Old Aug 15, 2006, 09:50 PM   #6
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I forgot how long its been since I wrote that. Yikes. That was a fun day referencing part numbers and chassis codes! Link. Also, the AWD 4G63 transmission and 4G69 FWD transmission have different mounting patterns to their respective blocks.
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Old Aug 16, 2006, 01:42 AM   #7
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Quote:
Originally Posted by matute
Next week i am going to my dealer and i will ask for the head gasket p/n of both engiens.

Ralliart head gasket:
MN163381

Evo head gasket:
MN155760
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Old Aug 16, 2006, 09:07 AM   #8
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Quote:
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There closer than most believe, or shall I say, than most want to believe, read the quote...
Whats the deal with the balance shafts. I know this is a large portion of the theory backing up the UD pulley, but whats the power difference w/o the balance shafts and how difficult is this, on a 1 to 10 scale lets say?
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Old Aug 16, 2006, 09:47 AM   #9
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Quote:
Originally Posted by DangerousDan
Whats the deal with the balance shafts. I know this is a large portion of the theory backing up the UD pulley, but whats the power difference w/o the balance shafts and how difficult is this, on a 1 to 10 scale lets say?
Not so much a power difference as less rotating mass. On a scale of 1-10, 1 being an oil change, 10 being an engine rebuild, I'd give the balance shaft eliminator kit about a 7. Mainly because you have to pull the engine and remove the timing belt, oil pan, oil pump, and front case.

There's even a how-to for older 4G63s (DSMs) online, to give you an idea of what you're up against:
http://www.vfaq.com/mods/balance-shafts.html
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Old Aug 16, 2006, 11:47 AM   #10
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The gear box question is very interesting, was thinking about that berore - Evo IX's 6 speed would be great
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Old Aug 16, 2006, 12:21 PM   #11
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Quote:
Originally Posted by senate6268
I forgot how long its been since I wrote that. Yikes. That was a fun day referencing part numbers and chassis codes! Link. Also, the AWD 4G63 transmission and 4G69 FWD transmission have different mounting patterns to their respective blocks.
Does that mean that thetwo blocks have differnect mounting patterns or just the trannys?
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Old Aug 28, 2010, 08:35 AM   #12
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about the clutch and fly wheel ,are the 4g69 and 4g63 clutches and fly wheel are the same?
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Old Aug 28, 2010, 09:41 AM   #13
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Wow talk about awaking and beating a long dead, decaying horse.....and no..
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Old Feb 11, 2014, 01:02 PM   #14
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There closer than most believe, or shall I say, than most want to believe, read the quote...
Does the intake manifolds interchange because i got given an intake for a 4g63 head and i want to put it on my 4g69?
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Old Feb 11, 2014, 01:17 PM   #15
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Googled "4g63 intake manifold" and "4g69 intake manifold"

4G69

4G63

Unfortunately they dont swap. :/
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Old Feb 11, 2014, 01:17 PM
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