Kia head pistons CR

1289 Views 3 Replies 2 Participants Last post by duh2150, Jun 18, 2008

duh2150

Discussion Starter · Jun 17, 2008

what is the compression of the stock pistons with kia head? im sure its 8.5:1

but whats the compression of the SOHC? 9.5:1 or 9.0:1 and i was talking to tearstone dude and he says 9.1:1, so whats really the right compression

What im trying to do is get pistons so i can have the 8.5:1 CR, but i dont know what CR to buy now because i hear like 9 differnt ratios, so can anyone plain out tell me either

1. what compression pistons do i get to make the kia head and pistons become 8.5:1?

or

2. what is the stock compression on the pistons with SOHC? so i can at least figure this out

Thanks

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duh2150

Discussion Starter · #2 · Jun 17, 2008

still havnt foudn a full idea, i read the kia head swap, but it was lost when everyone was talking about either 9.5:1 and 9.0:1 and then someone, i think started with an M did the conversions with the 9.0:1

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mysticj

· #3 · Jun 18, 2008

duh2150 said:
still havnt foudn a full idea, i read the kia head swap, but it was lost when everyone was talking about either 9.5:1 and 9.0:1 and then someone, i think started with an M did the conversions with the 9.0:1

Kia/Hyundai G4JS(4G64 DOHC)----> 10:1 CR
Mitsu "2G" 4G64---> 9.0:1 CR

G4JS head w/4G64 pistons---> Approx. 8.1 CR

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duh2150

Discussion Starter · #4 · Jun 18, 2008 (Edited)

so if i spec out some pistons with a 9.5:1 it was be about 8.5:1 correct? im just making sure im on the right page, thanks

or maby i can just buy some kia pistons speced out at 8.5:1? is that possible?

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