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07-05-2011, 12:20 PM | #1 |
Gone Wild
Join Date: Nov 2007
Location: Leduc
Posts: 300
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New 0.5 over Pistons; Does the Cylinder Require Boring??
Hey guys,
Just as the title says I’ll be putting in new piston & rings that are 0.5mm over stock into the G9 I picked up yesterday as it is burning oil. My question is- Can I get away with just honing the cylinder? Or do I have to take it to a machine shop to get it bored out to fit the over 0.5mm piston? Btw I will be posting up a new build thread shortly, just have not had a chance to take any before and after pictures…. |
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07-05-2011, 06:39 PM | #2 | |
Sometime's............
Join Date: Oct 2007
Location: Tacoma Washington
Posts: 11,868
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
Quote:
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07-05-2011, 07:03 PM | #3 |
Gone Wild
Join Date: Nov 2007
Location: Leduc
Posts: 300
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
I'll have to dig out my compression gauge and do a test, I'd be interested just to see the numbers as well....
now just to figure out where I left it.... I am also going to take a look at some top speed #'s just to see what kind of changes I get along the way. And thanks for the W/B I am 99% sure that it hasn't already been bored out |
07-06-2011, 12:05 PM | #4 |
Gone Wild
Join Date: Nov 2007
Location: Leduc
Posts: 300
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
Talked to an old friend and he is going to hook me up and get my cylinder bored on the cheap.... family owns a machine shop...perfect!!
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07-06-2011, 05:46 PM | #5 |
Gone Wild
Join Date: Feb 2011
Location: Winnipeg, Manitoba
Posts: 177
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
Glad to see you went with getting the cylinder bored, thats no place to cheap out on the repairs if you want it to last.
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07-08-2011, 11:56 AM | #6 | |
Gone Wild
Join Date: Nov 2007
Location: Leduc
Posts: 300
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
Quote:
I hope I get a bit of extra power out of the whole deal too!!... even if its just back up to what its is OEM... |
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07-08-2011, 12:12 PM | #7 |
LIFE IS TAKING FOREVER
Join Date: Apr 2010
Location: DANSVILLE NY
Posts: 5,327
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
have the head shaved while you have it off. i went 50 over on my piston and i didnt notice much difference until i shaved the head now i feel a big difference.
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07-11-2011, 11:15 AM | #8 |
Gone Wild
Join Date: Nov 2007
Location: Leduc
Posts: 300
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
Thats what I was thinking this weekend, how much should I get shaven off??
I was going to ask the guys in the shop what they thought, but they build large race engines all day long, not too sure if they would know what to do for this piddly golfcart engine |
07-11-2011, 01:35 PM | #9 |
LIFE IS TAKING FOREVER
Join Date: Apr 2010
Location: DANSVILLE NY
Posts: 5,327
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
i went 30 with my head. ive been running it for the past two weeks hard and no problems but lots of power.
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07-11-2011, 01:50 PM | #10 |
Vegas modded 420
Join Date: Jun 2009
Location: West MI
Posts: 15,433
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Re: New 0.5 over Pistons; Does the Cylinder Require Boring??
They are 6:1 compression IIRC. I think you cut so far and hit the squish band.
If you want max power you must have a fresh bore and piston with a 2 stroke. |
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