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Pistons For 1330


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#16 IronmanG

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Posted 08 January 2022 - 01:38 PM

Yeh, Gavs mini Estate. He doesn't know what power its running, but the timing is very safe.


I like that. Low CR has always put me off charging

#17 A1111j

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Posted 09 January 2022 - 03:04 PM

Question I am using a compression ratio calculator and when I put all measurements in there it gives me 9.56 but if I just change the bore size from 1330 to a 1293 and the rest the same the compression ratio drops to 9.35 is that right? Although I am getting a marginally more cc in bore?

#18 KTS

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Posted 09 January 2022 - 04:12 PM

Question I am using a compression ratio calculator and when I put all measurements in there it gives me 9.56 but if I just change the bore size from 1330 to a 1293 and the rest the same the compression ratio drops to 9.35 is that right? Although I am getting a marginally more cc in bore?

 

going from 1330 to 1293 is reducing the bore, so less cc (swept volume) not more

 

assuming unswept volume doesn't change, then compression ratio would drop as swept volume decreases



#19 mini13

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Posted 09 January 2022 - 04:36 PM

That's the one, I thought I remembered 150hp mentioned, I must be thinking of somthing else.

#20 A1111j

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Posted 17 January 2022 - 07:32 PM

Update guys finally found a solution. so engine is getting liners and bored to 1293 and gonna fit 18cc +20 forged pmega pistons. if I get the piston flush to block deck I will get a compression ratio of about 8.46 that mean I can run abit more boost in the future if need too.




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