FE Power Forums
FE Power Forums => FE Technical Forum => Topic started by: RicMc on May 06, 2023, 05:34:42 AM
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We found two used side oiler blocks that were originally used in a tractor pull setup and damaged. The one needs three sleeves and the other has just been align honed
and in order to straighten it needed the deck cut to 10.133. It looks like it will clean up at 30 over but we'll find out for sure Monday when it goes into the CK-10 boring
machine. My question is will I need to have the pin height shortened when I order pistons? I would like to keep the compression around 10ish. We just finished the NOS
Medium Riser heads with 2.19 and 1.75 SS valves that came from DSC and the cc's came in at 86. Once we get the bore size determined we'll call Diamond for pistons.
Rod length will stay at 6.488 and an original steel crank will be used. I hope my question is clear as I seemed to ramble a bit. Thanks for any info you would like to share.
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You will just give them the compression height that you need to make them sit at zero deck or a few thou out. In your case, with a 10.133" deck height, it would be ((10.133-6.490-(3.780/2)) = 1.753". Wouldn't hurt to get them at 1.755".
For an 86cc chamber with a target of 10:1, you'd need to have about 1-2cc of net volume, which means that the piston would have a small dome with valve reliefs to give that net volume.
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Thanks Brent. I thought that was what was going to be needed but am very appreciative of your response.
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Diamond pistons can be pretty heavy. I would also opt for their "maxi-lite" program which helps with that.