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Need to know weight of OEM wrist-pin
Posted: April 6th, 2009, 7:34 am
by Roostius_Maximus
I've got a few different pins that HAD been marked to say what they were from, theres 6 and not 2 the same. I need to compare a balance factor and need to know what baseline Stock weight is in grams
Posted: April 6th, 2009, 7:58 am
by 100hp honda
i have one but no way to weigh it
Posted: April 6th, 2009, 8:12 am
by robertg
I am pretty sure I have a stock one. I will try to get it weighed tomorrow.
Posted: April 6th, 2009, 8:16 am
by Roostius_Maximus
Thanks!
Posted: April 6th, 2009, 3:19 pm
by fastkart
If all else fails I have a stock top end thats going to come out in the next week.
Posted: April 7th, 2009, 2:53 pm
by robertg
The one that I have is 82.16 grams. I'm not 100% sure if it's OEM, but the piston was.
Posted: April 7th, 2009, 4:25 pm
by jbird_710
I just checked a brand new OEM I'm about to install and it weighs right at 3 ounces on my postal scale. It's not digital but seems to be fairly accurate.
82.16 grams is 2.9 ounces so robetg's pin is probably OEM also.
Posted: April 8th, 2009, 7:30 am
by Roostius_Maximus
Thanks guys! I needed to start from a baseline.
i've got
60.3
60.4
77.4
79.4
82.1
83.4
and
86
Posted: April 8th, 2009, 8:00 am
by Janne
There is a great span in weight you have there, do you have any idea what brand the lightest are?
Posted: April 8th, 2009, 12:41 pm
by Roostius_Maximus
everything from oem, vertex, 3 different wiseco, and prox
Posted: April 8th, 2009, 12:42 pm
by Roostius_Maximus
what width is that wristpin you have in your wiseco?
Posted: April 8th, 2009, 1:01 pm
by Janne
Home from work, so I could do some measurements.
The wiseco pin width is 60.0 mm and it weights 61.2 gram.
Posted: April 8th, 2009, 1:34 pm
by Roostius_Maximus
i just got the scale out for the old pistons i have
OEM 89mm 404.6 pin 82.1 69mm wide
prox 89.75mm 418.7 pin 79.4 69mm wide
636 wiseco 89mm 374.2 pin 59.9 60mm wide
554 wiseco 89.50mm 360.3 pin 84 60mm wide
weights are without rings or clips, and obviously there is going to be a small change with oversizes
i'll have a pair of 2 different new honda pistons to weigh tommorrow too.