4g69/4g63 Compatibility question.
Aug 15, 2006, 05:54 PM
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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!!!
Aug 15, 2006, 09:00 PM
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There closer than most believe, or shall I say, than most want to believe, read the 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.
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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Aug 16, 2006, 09:07 AM
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Originally Posted by Arithmetic
There closer than most believe, or shall I say, than most want to believe, read the quote...
Aug 16, 2006, 09:47 AM
#9
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?
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
Aug 16, 2006, 12:21 PM
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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.
Feb 11, 2014, 01:02 PM
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