if i were to install the jdm itr pistons in my 99 gsr woould a break in process be required..i was told by some yes because the rings need to reseat and others that no because its standard bore pistons..any input?

 

definitely YES - the rings need time to seat. also since you will want to replace the rod bearings, they need to break-in as well.

 

Yep. And they need a break in oil change at like 500 miles. Your car will thank you for it in it's own little way.

 

Before you start it, unplug the distributor and crank it over a bit to get oil pressure in the engine and get oil circulated. Then let it idle for a bit after you finish the ring/piston/bearing install to let the rings seat. After that, just drive it normally. A lot of documentation about no break in period has been put up on the web lately, and I agree with it 100%. Check this out http://www.importbuilders.com/breakin.html

 

interesting, Brett...very interesting.

 

There was another post on H-T I read a while back, and I actually heard about this theory a few years ago. The only break in I would ever do is for a clutch. If I was building a motor and going turbo, I'd let it idle to seat the rings, then tow it to the tuner and throw it on the dyno.

 

Make sure you lube it up before assembly with engine lube to make the inital startup less harsh. But you do need a few hundred miles of "easy" driving to make sure the bearings and rings seat correctly.

 

Woah, that link you posted brett, almost made me cry. . My car= the fuxors

 

Actually the bearings require no break in period, they are good to go....and the rings seat in about 20 mins.

 

My helms says anytime a new rod bearing is replaced you have to idle the car for no less then 20 mins the first start up.