4A-GE engine mix - question

[Uzelac]

Don't know that. Can't find info online, and by the looks... they are pretty thin. Not sure how much material thickness is needed to be safe.

[oldeskewltoy]

you could contact Wiseco, tell them your piston part numbers, explain you need to lower compression because your head chambers are too small, and that you want to machine down the crown of the wisecos, and you need them to tell you how much can be cut down.

[Bean]

oldeskewltoy Wrote:you could contact Wiseco, tell them your piston part numbers, explain you need to lower compression because your head chambers are too small, and that you want to machine down the crown of the wisecos, and you need them to tell you how much can be cut down.

as above, this will bring you the most benefit from all options. if that doesn't work your last reasonable resort would be a HKS headgasket, should be around 100€ incl. postage etc and they are available in 1.6 and 2mm but you'll be decreasing the efficiency of the squish area.

[Uzelac]

Good info, at last

Machinist cut a head a little deeper, around .5mm whole chamber, not sure.
ATM cc is 33.8, looking good .
Valve seats are going by .1-2mm more, maybe they will slightly touched.
That should bring cc at 34cc which will bring CT to exactly 12:1.