CP piston pins getting blue

[tomka111]

Hi,

I tuned a RXP 2006 and built in CP pistons and Carillo rods. Now I´m getting the second time a piston failure on the last cylinder and found out that in both failures all 3 piston pins went blue on side due to overheating. Has anybody seen this problem before? I was thinking that possibly the piston bottom cooling is not working but I cannot see any problems on the jets or oilscrews.

[skidoochris]

sounds like you damaged the oil squirters
they spray oil on the pins

[race jase]

Make sure you have the correct oil squirters for the correct engine year

[tomka111]

aren´t they all the same in RXP?

[tomka111]

I wonder that the pins are only blue from overhaeating on one side.

[Spanners]

I wonder that the pins are only blue from overhaeating on one side.

What does the BE bearing look like?
Id guess that if the BE looks ok then the small end bush in the rod isnt square to the axis, or the cylinder hasnt been bored square

[race jase]

aren´t they all the same in RXP?

If its a pre 2009 rxp yes they are the same if its a rxpx or 2010 later they changed also the HO engine has changed again

[SLASHER]

Is the oil pressure different on the sprayers , should be the same ?

[Kmorningstar_rxp]

The wrist pin could be too tight. Binding up the Piston. Had a customer who was building his motor and they were so tight that the piston wouldn't float or move on the rod. Ended up just honing them a little to free them up

[Kosh]

Couple of pictures of old versed new piston squirts.

Sitting on a magnet to keep them straight.

the outside ones are from an 06 GTX limited (215)
the middle is a late model one. the part number suits a 2012 model RXTX260.
I don't have a number drill set so could not measure any difference in hole diameter, in the flesh there's no noticeable diameter difference the chamfer is an optical illusion. One thing for sure the spray angle is different.
From my understanding the squirts main function is piston cooling not pin lubrication.