Buffed pistons
#1
Buffed pistons
Hi,
If you know how to create shine on somehting you will try to apply it to anything.
Last weekend was inspecting my stock pistons any I found them to be rough on the top. I got myself some 400 sanding paper and tried to work my way down to 1500 grit wet standing.
Here are some pictures;
stock, rough.
Rough sanding in process. You can see still see the casting finish, some is sanded away.
bufffed
The tops now all have a mirror like finnish to them.
I didnt feel confortable by removing more material to level all the casting dimpels, there are some left.
This does not have big potential other that "some" safeguard to detonation, thats all I think.
Please discuss
If you know how to create shine on somehting you will try to apply it to anything.
Last weekend was inspecting my stock pistons any I found them to be rough on the top. I got myself some 400 sanding paper and tried to work my way down to 1500 grit wet standing.
Here are some pictures;
stock, rough.
Rough sanding in process. You can see still see the casting finish, some is sanded away.
bufffed
I didnt feel confortable by removing more material to level all the casting dimpels, there are some left.
This does not have big potential other that "some" safeguard to detonation, thats all I think.
Please discuss
#11
Curiosity was killing me so I pulled out my extra box of Supertech 83.5’s and weighed them with my trusty eBay scales. Mine were a whole lot worse than what you started with before lots and lots of cleaning and polishing.
Cleaned up they now weigh 444.2, 444.2, 444.1, 444.0 with pins. The pins were each 100.8. Are stock ones really that much lighter or does the +0.5 make that much difference?
EDIT: my son says he doesn’t think they are Supertech pistons.
Cleaned up they now weigh 444.2, 444.2, 444.1, 444.0 with pins. The pins were each 100.8. Are stock ones really that much lighter or does the +0.5 make that much difference?
EDIT: my son says he doesn’t think they are Supertech pistons.
Last edited by Turbomack; 02-21-2020 at 09:15 PM.
#12
Curiosity was killing me so I pulled out my extra box of Supertech 83.5’s and weighed them with my trusty eBay scales. Mine were a whole lot worse than what you started with before lots and lots of cleaning and polishing.
Cleaned up they now weigh 444.2, 444.2, 444.1, 444.0 with pins. The pins were each 100.8. Are stock ones really that much lighter or does the +0.5 make that much difference?
EDIT: my son says he doesn’t think they are Supertech pistons.
Cleaned up they now weigh 444.2, 444.2, 444.1, 444.0 with pins. The pins were each 100.8. Are stock ones really that much lighter or does the +0.5 make that much difference?
EDIT: my son says he doesn’t think they are Supertech pistons.
Unless you're using the same scale I wouldn't pay the most attention to the actual numbers. Calibration can be way off from one another. I see yours has been calibrated somewhat recently, unclear what OP is using.
#13
FWIW, out of the box my Supertechs (84mm) were 289.3, 289.6, 289.6, and 289.9, with the wrist pins being 98.7, 98.2, 98.0, and 97.7. Paired up that way the assemblies were within 0.3 grams of each other, right around 388 grams.
--Ian
#14
If a digital scale that reads out to tenths of grams is off by 50 grams that's not just calibration.
FWIW, out of the box my Supertechs (84mm) were 289.3, 289.6, 289.6, and 289.9, with the wrist pins being 98.7, 98.2, 98.0, and 97.7. Paired up that way the assemblies were within 0.3 grams of each other, right around 388 grams.
--Ian
FWIW, out of the box my Supertechs (84mm) were 289.3, 289.6, 289.6, and 289.9, with the wrist pins being 98.7, 98.2, 98.0, and 97.7. Paired up that way the assemblies were within 0.3 grams of each other, right around 388 grams.
--Ian
I was simply pointing out that it might not be as big as a 60g difference based on calibration.
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