pros and cons for bore size?

[DenZel]

want to order up some pistons and rods before opening up the engine. (want all the parts before i take it to a builder)

just wondering whats the go overbore??

pros and cons...??

be for a n/a build.

 

[cribbj]

These engines have extremely thin liners (only 2.0mm on the early engines, and 1.5mm on the later ones), so they really can't be bored too much, in the conventional sense. In fact Lexus states in bold letters "Never attempt to machine the cylinder because it has a thin 0.08 inch (2.00mm) liner." So about all you can do is hone the existing liners, and go maybe 0.5mm over.

The only option for serious overboring, is to bore the existing liners completely out, shrink in a new set of liners, and finish bore them. Expensive and AFAIK, hasn't been done successfully, and without leakage, yet.

The rods are easy and cheap - get a set of the Lextreme forged rods.

 

[DenZel]

Here are my recommendations:
· N/A Application: .020" overbore and stock compression ratio
· Supercharger: .015" overbore with stock compression
· Turbo (Mild): .015" overbore with 9.5:1 compression ratio
· Turbo (Wild): .010" overbore with 8.5:1 compression ratio

so you reckon to go .05??

whats safe enough, i dont want to go serious, just know it will fit well.

 

[cribbj]

I would not go more than 0.5mm or 0.020 inches.

I'm pretty sure there are some here who have experienced liner failure, although I don't know if it was related to overboring.