Guys,

Just been to see the bloke entrusted to rebuild my engine today (click the pic in my sig to see the full story). The block will need to be bored and of course all pistons will be replaced with over-sized ones.

My question is - am I likely to see an increase in power from using over-size pistons? Or are they fitted because the block has to be bored and hence a 'bigger' piston is needed.

Excuse my ignorance on this one…not something I've dealt with before!!

 

main reason, they need to be bigger is to account for the larger bore.

but yes you will get a very small increase in displacement, so in theory you should see a power gain, but for a .5mm over bore your looking at about .020cc in a 2.0l engine, so nothing to write home about lol

 

Thanks mate - thought it would be something along those lines.

It's the first available oversized piston so it doesn't need to be bored out too much.

 

Normally no change in power, but it can shift the torque down the range a bit, so you may make that power a little sooner, but .5mm isnt going to make any real difference.