Stock rods bluish after pin install
06-02-2004, 11:26 AM
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Stock rods bluish after pin install It seems the morons in the local machine shop torched the rods while installing piston pins. There is some bluish color around the pin area. Are they garbage now without question ?
06-02-2004, 12:25 PM
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uuuhhhhh...That's how you install press fit pins. Of course, it is possible to get them too hot.
Wait...Do you mean they actually used a torch instead of a rod heater?
Wait...Do you mean they actually used a torch instead of a rod heater?
06-02-2004, 12:45 PM
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It seems they may have used a torch. They are bluish in color now around piston pin area. In Helms manual it is said not to heat over 315Celsius which is also the point of changing color.
06-02-2004, 01:31 PM
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Well if they are junk my 383 sbc(built to make around 550 fwhp) that I just built is junk too. I have never seen a set of press fit rods that HAVEN'T been heated and I recall all of them having a blueish looking color.
Josh S.
Josh S.
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06-02-2004, 06:07 PM
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the pin ends only are put in a heater to expand the hole so the pin will slide in. then as it cools, the rod will shrink over the pin. if you were to try and press the pin onto the rod, the piston will most likely crack from the pressure. i used to work in a machine shop. pressing the pins off the pistons, the pistons would crack. the ends are heated to 500*F. sometimes, if they let them sit a little too long in the pot, the blueing occurs. i've ran 200 hp n2o on cast pistons and stock rods heated, with neither of them breaking.
06-02-2004, 07:44 PM
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That is perfectly normal discoloring. Don't lose any sleep over it.
here's a heat color chart- they did not get that hot.
here's a heat color chart- they did not get that hot.
Code:
2000F Bright yellow 1900F Dark yellow 1800F Orange yellow 1700F Orange 1600F Orange red 1500F Bright red 1400F Red 1300F Medium red 1200F Dull red 1100F Slight red 1000F Very slight red, mostly grey 800F Dark grey 575F Blue 540F Dark Purple 520F Purple 500F Brown/Purple 480F Brown 465F Dark Straw 445F Light Straw 390F Faint Straw
Last edited by S_J_H; 06-02-2004 at 07:53 PM.
06-02-2004, 11:48 PM
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Originally Posted by S_J_H
That is perfectly normal discoloring. Don't lose any sleep over it.
here's a heat color chart- they did not get that hot.
here's a heat color chart- they did not get that hot.
Code:
2000F Bright yellow 1900F Dark yellow 1800F Orange yellow 1700F Orange 1600F Orange red 1500F Bright red 1400F Red 1300F Medium red 1200F Dull red 1100F Slight red 1000F Very slight red, mostly grey 800F Dark grey 575F Blue 540F Dark Purple 520F Purple 500F Brown/Purple 480F Brown 465F Dark Straw 445F Light Straw 390F Faint Straw
Thanks! I just tried to search this info in the web.
