Hi all, I a m currently rebuilding my YB engine. and have been told that 3thou piston to bore clearance is what I am looking for this I have been told is also true of main bearings along with big end bearings.
Can anyone one confirm this to be correct?
We all know what the manual states and I have been told that @ 9psi standard boost/heat levels this would be correct yet if you were to run a modest 20psi the goalposts do change.
I know how engines work, and require nothing more than an expert engine builder's confirmation on what is stated above, is this a loose setup? at 20psi ? I am currently running a .48 housing running a GT2871R so I will probably have to change the turbo to a GT2860RS so I don't out run the 803 injector period.


Please don't educate me on anything other than I have asked, Bla , Bla Bla. I do not intend on running more than 300bhp don't want longstuding , don't want a metal gasket that requires me to cut my block and head in half.


Thanks very much.


Tim.

 

You need to say what pistons you are running.


Mark

 

Mark, thank you for your time , running 0.50mm 0versize mahle pistons with cutouts from Matt lewis..


Thank you.

Tim.

 

Standard clearance will be fine.


Mark

 

Thanks very much.



Tim.