Author Topic: anyone care to explain this piston?  (Read 4603 times)

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Offline vagassasson

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anyone care to explain this piston?
« on: August 11, 2014, 12:16:57 PM »

Why does the piston on the right have a big hole in the side that goes almost all the way to the middle. It has the same hole on both sides. I am new to working on k5 motors so if this is a really stupid question just delete this thread.

Offline vagassasson

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Re: anyone care to explain this piston?
« Reply #1 on: August 11, 2014, 12:19:27 PM »
It also has a set of groves machined in the ring area of the piston

Offline stujordan

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Re: anyone care to explain this piston?
« Reply #2 on: August 11, 2014, 12:27:18 PM »
Holes I guess are for cooling....

Grooves r for the rings? ;)

Motorrad

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Re: anyone care to explain this piston?
« Reply #3 on: August 11, 2014, 12:37:23 PM »
Holes for weight

Groves?

Offline vagassasson

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Re: anyone care to explain this piston?
« Reply #4 on: August 11, 2014, 12:40:20 PM »
If you zoom in really close to the rings on the right there are 5 small groves cut in between the ring groves and 5 more above the ring groves +1 more below the ring groves

Offline vagassasson

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Re: anyone care to explain this piston?
« Reply #5 on: August 11, 2014, 12:58:53 PM »

Factory piston
other piston

Offline stujordan

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Re: anyone care to explain this piston?
« Reply #6 on: August 11, 2014, 01:07:45 PM »
Id wager they are for trapping oil and hot gases....think of them as built in micro-rings....anyone got a better guess?

Offline vagassasson

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Re: anyone care to explain this piston?
« Reply #7 on: August 11, 2014, 01:15:42 PM »
Id wager they are for trapping oil and hot gases....think of them as built in micro-rings....anyone got a better guess?
I was thinking the same thing but I had never seen a piston like it before so I had to ask

Offline stujordan

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Re: anyone care to explain this piston?
« Reply #8 on: August 11, 2014, 02:43:53 PM »
Are u going to a larger bore or just replacing the piston?

What brand is that piston?

Offline vagassasson

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Re: anyone care to explain this piston?
« Reply #9 on: August 12, 2014, 01:31:47 AM »
I bought a used piston and cylinder off eBay.  This is the piston that came with the cylinder but as you can see its already pretty wore out

Offline Speedway73

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Re: anyone care to explain this piston?
« Reply #10 on: August 12, 2014, 05:36:34 PM »
Piston on the right looks like an older Wiseco. The tiny grooves were marketed as "anti-detonation" grooves I believe.