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#1
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Rods/Piston
I had a machine shop press some new Wiesco pistons onto a set of stock rods (two dots rods) and I noticed that some of the rods were a little purple-ish brown on the end were the wrist pins were pressed onto the rods. I should mention all the rods are a little brown-ish on the wrist pin end where they heated them to press the wrist pin on for the pistons, but I thought if they got too hot (the purple-ish color) that this actually fatigued the rod and potentially ruined the rods. My experience was that they heat the rod a little in an oven and freeze/cool the wrist pin and then quickly slip the wrist pin, rod, and piston together before each one either cools or warms up, but they never heated them up to high temperatures. Any idea if my rods are now any good?
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#2
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Re: Rods/Piston
Hard to tell without seeing pics? It also might be marker dye cooked on the rod ... some use the dye during balancing and such?
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Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#3
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Re: Rods/Piston
Ken, thanks for the help. Here is a picture, what do you think?
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#4
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Re: Rods/Piston
Did they polish the rods or shot peen them? If so, that might be what you are seeing there ... it does look like they were "blued" by heat, but it's hard to tell ...
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Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#5
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Re: Rods/Piston
Ken, they polished the rods, but never shot peened them, what do you think?
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#6
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Re: Rods/Piston
Personal opinion is that they'll be fine. It looks to me like the discoloration may have come from polishing and then the inductive heating they use for pressing the pins.
__________________
Ken Mosher 1987 GN original owner 650+ HP Black 2015 BMW 328xi XDrive wagon 2012 Volkswagen Tiguan (the Tig!) Night Blue Met (sold) 2006 Trailblazer SS Red Jewel Tint 395 HP AWD (sold) 2014 Silverado LTZ Crew 4WD 2012 Honda VFR 1200F Tahitian Blue (sold) 2015 BMW S1000R Racing Red 2013 Honda CBR500R Red (wife's bike) 2014 Triumph Bonneville T100 2003 Harley Davidson V Rod Anniversary Edition |
#7
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Re: Rods/Piston
Ken, thanks, two other people said the same thing, so it is good to hear you confirm what they said.
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