Coilpack CG10DE pistons in CG13DE

[Damicra83]

So I have checked a few older threads but have not found the exact answer I'm after. I have a CG13DE Auto block that I'll be building to try to get the highest compression ratio as I plan to run it on E85 fuel. My question is has anyone fitted coilpack CG10DE pistons into a CG13DE?? I have read that the compression ration of early CG10DE (flat top) pistons in a CG13DE is around 12:1 compression ratio but I would like it a bit higher. From the research I've done the standard compression ratio for CG10DE is.
Early model 9.5:1
Late model (coilpack) 9.8:1
Another option I'm looking at is fitting CR10DE pistons in my CG13DE (compression 10:1)
or JDM 12SR CR12DE 11.5:1

I'm also wanting to hear from anyone that has skimmed the block and/or head to bump up compression.

 

[frank]

the coilpack pistons have the same compression height, but they are a later design
the cga3 crank will raise it for you, skimming the block or head gives slack lower chain issues

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[.Maarten]

Coilpack engines have a bigger bore than the dizzy engines. A coilpack piston wont fit a cg13de

 

[frank]

its only the 1348 pistons that are bigger bore maarten

 

[.Maarten]

Ah i thought both coilpack bottoms where the same. Good to know they arent.

 

[Damicra83]

So a CG13DE with early CG10DE pistons and CGA3DE crank, what compression ratio do you think it would make? Also side note but the slightly larger crankshaft should also increase the capacity to...1311cc, right??

I would love to see some CR10DE/CR12DE pistons. As they might be of a better design.

 

[frank]

or corsa pistons ?

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[fuzzy-hair-man]

I would love to see some CR10DE/CR12DE pistons. As they might be of a better design.

I've what I think are cr12 pistons the gudgeon pin is the same diameter as the cg13 so is the pin to top of piston height, there's a dish so probably not the best for compression ratio increase.