Everywhere I've searched has said that the F20C compression height is 1.181"(30mm) but that doesn't make sense with the other specifications. If the deck height is 223.9mm, the stroke is 84mm and the rod length is 153mm then it seems that to have an even deck height you'd need a ~28.9mm compression height piston. I have a suspicion that everyone is just going off of aftermarket provided specifications and no one is actually measuring. Can someone provide proof either supporting or disproving my claims? I'd like to order some factory F20C pistons for another project but the information floating around is giving me a headache. If the compression height is correct then one of the other dimensions has to be off. Thanks for the help.

 

compression height is 1.181. from the factory the piston sticks 0.040 out of the hole.

Mahle confirmed this when I sent them both f20c and f22c rotating assemblies to aid in the development of their pistons. My own measurements of stock blocks matches.

CP/Wiseco/JE use 1.141 because people are stupid and dont check things, go oversize on teh bore and the piston ends up hitting the head.

The stock chambers are recessed about 0.060, a stock motor will usually have about 0.050 piston - head clearance. (the piston comes 0.010 above the headgasket)

 

^^^^------exactly what he said, the F20 doesnt run 0 deck height. When at TDC the start of the pistons sidewall is actually very slightly out of the cylinder sleeve. I just put mine together and noticed it while assembling

 

Did they list a low compression pistons? m done with experimentation.
TODA Racing Japan offers a 2.4 L stroker for around 8k.
N/A only.
No specs offered.

 

Mahle does have low compression pistons. PM me for more info