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Tre what you need to simplify for the forum is the difference in which a sohc piston makes higher compression.
First off all SOHC's use what is called the hemispherical head design (they have horrible flame front's, not well at producing swirl), the list can go on and on. DOHC's use a shrunken volume head design known as the pentroof which increases flame front swirl, and everything that the SOHC engines couldn't do. This means that dish hiegth is raised on all sohc pistons allowing for the higher compression in the dohc engines, but this is a big no, no using JWT cams or even PDM's for high rev applications.
Personally I do not agree with the use of the KA24e sohc pistons, the raised dish leaves no room to run high lift cams, and the oil rings are well... Not positioned to work as well as the DOHC pistons. If anything you should look more into NAPS-z 24 pistons which come flycut and would be much more suited for high rev and a high compression than normal, also allowing the use of higher lift cams.
Great so you had some stocker pistons handed to you to raise your compression.....(YAWN) It only keeps your KA limited to most of it stock settings before you bend a valve.
If anything look into something that is well worth the investmant instead of hand me downs if you plan on making a high HP NA KA.
There are so many BETTER pistons to offer like super techs, arias, CP that are designed for the dohc and will allow for better tuning as far as the valve train is concerned. Why people look for cheap power only to fuck up there engine down the road baffles me. For an affordable $450 investment any of those pistons I mentioned are much better suited.
Fuck really man if you want high compression why don't you leave the stocker DOHC pistons in and just clover leaf weld the head??? I've seen guy's make 12.1:1 CR's with head welding and stock pistons, then run massive lifting cams..... (this is the direction of my build).
So when you title a thread mmmm high comp, and all I see are sohc pistons, I'm like great this guy is where I thought it was about 6years ago....LOL
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