Thread: What's this hole for?
02-02-2008, 09:42 PM #1
What's this hole for?
Picked up this OEM piston kit to replace one on my '97 1050. Here's a picture of it next to the one that it will replace.
I have a '98 1050 that I'm tearing down now and noticed it didn't have this hole/port on the piston.
So, what's it for and why doesn't the '98 have it? Is the difference because the '97 is running 009 cylinders and the '98 has 081's?
02-02-2008, 09:50 PM #2
- Join Date
- Apr 2006
- panama city beach 'fl
holes for boost port also help cooling ether will work fine
polaris was allways changing stuff midway thur years
02-02-2008, 10:04 PM #3
I was told the hole helped cool the top of the piston.The 009 cylinder I know has a hole in the cylinder wall just below the boost port to match the piston.009 cyl was replaced by 018 ,which does not have the hole in the cyl wall.I suspect the 081 cyl should also have it.I know the newest piston # from Polaris(2201626)does not have the hole.not sure when Polaris used this piston in production.
I don't know how or if it affects how it runs.
02-03-2008, 03:46 PM #4
Chip is correct..
I agree with Chip, and I have used/ added/ removed holes in pistons many times.. I think it helped keep the top (underside) of the piston cooler, and we did it for some high compression motors.. But I wouldn't worry about it either way.
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