http://www.pureperformancemotorsport...pistons.htmlHi all im slowly getting my car back on the road after many long months of sitting collecting dust and costing mega $$$$ the fun was meant to start finaly got my block back from engine machine shop ready to be sent to my mechanic and just before we where going to start the rest of motor and get it back together ...we noticed the direction marks on the pistons where facing the wrong way !!

We spoke to the person who supplied the parts (ALSO maker of the pistons and he said they can be rotated 180 degrees and face the wrong way has anyone had this happen ?

I'm building a 7 bolt 4g64 L.R 156mm / 4g63 evo 7 dohc head combo , i think that they are 1st generation pistons (EVO 1,2,3 ) as the direction faces the same way an EVO 1,2,3 does

installed by my engine machine shop ( crank , pistons , rods ) the rods and pistons look like Mahle 87mm pistons / magnus 156mm rods ... hmmm please help check out the link below thanks

http://www.pureperformancemotorsport...d-pistons.html

 

If the pins are offset no

 

Could have been done so the valve reliefs match.

 

Even if the manufacturer states

*Installation direction
The direction of installation in the form of a crankshaft flywheel symbol or an arrow showing the direction with respect to the control side of the engine. The marking "vorn", "Front" or "Abluft" (exhaust air) or a cast-in notch also indicates the installation direction, which must be considered not only because of an asymmetrical crown shape but also on account of the offsetting of the gudgeon hole for noise reasons.

EVO 1 2 3 engines face the opposite direction * even though the directional indicator is facing the right direction on my engine the exhaust and inlet ports don't match unless they are spun 180 degrees ?

Im only worried that if anything goes wrong who takes the blame for it ? and who wears the cost ?

 

It is your build, your engine so you have the final say.

You are aware of the orientation of the pistons, you spoke with the builder, you have spoke with the piston manufacture.

You have listened to what each has to say, now it is up to you to agree with the build or not.

If you agree and go on bolt the head down and run it.

If you do not agree then you load it up and take it back to the builder and have the pistons swapped around.

You are putting together an engine something other than stock, your builder should have told you what he will cover and what he will not.

But you should just have it in your mind that if something fails, it all falls on you.

If you read the disclaimer on the box of pistons, you will see that the piston manufacture will not cover squat.

 

I would install them such that the arrows point to the timing belt side, then put the head on and double check that there are no conflicts with the valves and pistons. I doubt there will be any issues as aftermarket pistons generally have very generous valve reliefs.