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PostPosted: Wed Oct 09, 2013 10:50 am 
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CSM Junkie
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Location: Indianapolis, IN
There is a 2.5mm difference in Bore between them.

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Thom
1991 GVR4 1025/2000 (PTE 1200's, 16g, DSMLink v3, gm-maf, eagle/ross, .020 over, 272's, EVO VIII Wheels)
1992 GVR4 866/1000 (getting everything from above)


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PostPosted: Wed Oct 09, 2013 1:37 pm 
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How about same question but in a 4g67?

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91' Mitsubishi Colt 4G67T FWD "The Minion" - 12.26@118
94' Mitsubishi Galant GS 4g63 Swap "White Unicorn"
95' Eagle Talon Tsi FWD "Ernie's car" - 13.92@104 *Rest In Parts*


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PostPosted: Wed Oct 09, 2013 8:57 pm 
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The Silent Administrator
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There are some engine math guys here. They can answer that. Most of the 4G6X blocks minus deck height differences, I believe have the same starting material thickness in the bores. It is only the boring machines that take them to a proper hole size for a 1.6, 1.8 or 2.0L piston diameter.


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PostPosted: Wed Oct 09, 2013 8:59 pm 
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Of all the piston choices I listed, including custom pistons with a higher compression (which could be made lower by the company if requested), why not use 4g61t pistons in your motor???

Short answer to putting 2.0L pistons in your 4G61t, I would not attempt it. You should be talking to us and a machinist (machine shop for engines) about safe bore dimensions for your motor.


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PostPosted: Sat Oct 12, 2013 4:46 pm 
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4g61 NA but low boost. 5-7 lbs suggested by some.

4g61NA and delete the turbo. :lol:


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PostPosted: Sun Oct 20, 2013 8:35 pm 
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You would have to ask a machine shop for the dimensions on both pistons, diamater - clearance to cut to is different for each type of piston (hyper-eutectic, cast, forged, etc), wrist pin height - using 4g63/4g61 rods or if 4g93t rods can be used. I do know that 4g93t rods are weaker. There are 4g93t motors that were stock in our cars, very rare european models mainly. Leftover parts bin.


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