This is not worth the trouble unless you are building a high dollar, race only car... I would not recommend this if this is your only car and it's a daily driver... you might as well spend a little more and go FI... you will get better more reliable gains... plus no one has gone high compression yet and you don't know how the engine will react... if you want to be the guinea pig go for it... you better put some money aside for head gaskets...

 

Why head gaskets?

 

Guys, you can change the compression on any engine simply enough IF you are comfortable building your own motors and turning a wrench on your own... Ive been building motors for years...

Think about this for a second... Real race motor builders don't care what a piston was originally designed for, I know that a 4" bore piston with a certain skirt height will work for a particular chevy SB... I call a piston manufacturer of my choice, tell them the specs I want, such as diameter, ring thicknesses, skirt height, compression, etc... They will then go get me the piston I want... My neighbor building a 4" bore Ford SB will order the same exact piston... I have even seen toyota pistons put into honda motors and vice versa


So in short, if anyone is interested in doing something like this, call a good piston Manufacturer with the specs you want, run stock ring sets and such, and I guarantee you can get the proper pistons...

The ECU will take care of the rest, but you may need just an adjustable fuel pressure regulator to not get it to run rich/lean... And I would be interested to see if anyone here knows where to get slightly larger injectors...



And as a side note, I have not done this on my RA... Ive done it on Toyota's, VW's and a few SB's in the past...