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civic707 · 10-13-2004, 12:16 AM

i have a gsr and i am thinking of bigger piston.
How big do u think i should overbored without changing the sleeves and how much compression

97CTR · 10-13-2004, 06:57 AM

82mm is max bore on stock sleeves, 81.5 is safer.

92civicb18b1 · 10-13-2004, 08:08 AM

You [b]can[b/] bore to 84 mm but the sleeves are gonna be pretty damn thin, I would reccomend about 82mm like 97CTR said.

It also depends on what you're doing, if it's going to be a relatively stock motor where you're not beating on it all the time, 84 is reasonable and will work fine. If your going FI, I wouldn't go over 82 on stock sleeves.

It's early and if I said something stupid and wrong just ignore it.

JDMilan · 10-13-2004, 11:45 AM

I would go 81.5......seen some good graphs with 81.5mm

Calesta · 10-13-2004, 01:45 PM

Quote:

Originally posted by 92civicb18b1@Oct 13 2004, 08:08 AM
You can bore to 84 mm but the sleeves are gonna be pretty damn thin, I would reccomend about 82mm like 97CTR said.

It also depends on what you're doing, if it's going to be a relatively stock motor where you're not beating on it all the time, 84 is reasonable and will work fine. If your going FI, I wouldn't go over 82 on stock sleeves.

It's early and if I said something stupid and wrong just ignore it.

Quoted post

I wouldn't bore an 81mm block to 84mm unless you just plan on using it as a wall decoration.

sohcbuilder · 10-13-2004, 03:03 PM

werd ... depends on what your setup is compression, depends wether your going na boosted or nitrous ....... as far as bore'n it if your going turbo you might as well bore and sleeve it if your going all motor id bore it 81 and be safe

Calesta · 10-13-2004, 03:53 PM

Quote:

Originally posted by sohcbuilder@Oct 13 2004, 03:03 PM
werd ... depends on what your setup is compression, depends wether your going na boosted or nitrous ....... as far as bore'n it if your going turbo you might as well bore and sleeve it if your going all motor id bore it 81 and be safe

Quoted post

That would be called not boring the block at all.

civicious · 10-13-2004, 05:21 PM

sleeve that bitch. 85mm.


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10-13-2004, 12:16 AM	#1
civic707 Junior Member Join Date: Jun 2004 Posts: 5 iTrader: 0 / 0% Rep Power: 0	i have a gsr and i am thinking of bigger piston. How big do u think i should overbored without changing the sleeves and how much compression

10-13-2004, 06:57 AM	#2
97CTR Senior Member Join Date: Jul 2003 Posts: 745 iTrader: 0 / 0% Rep Power: 21	82mm is max bore on stock sleeves, 81.5 is safer.

10-13-2004, 08:08 AM	#3
92civicb18b1 The Trisexual Join Date: Oct 2003 Location: The asshole of the USA, New Jersey Age: 22 Posts: 8,874 iTrader: 0 / 0% Ride: 2007 Civic, 1995 Jeep Grand Cherokee Rep Power: 123	You [b]can[b/] bore to 84 mm but the sleeves are gonna be pretty damn thin, I would reccomend about 82mm like 97CTR said. It also depends on what you're doing, if it's going to be a relatively stock motor where you're not beating on it all the time, 84 is reasonable and will work fine. If your going FI, I wouldn't go over 82 on stock sleeves. It's early and if I said something stupid and wrong just ignore it.

10-13-2004, 11:45 AM	#4
JDMilan Senior Member Join Date: May 2003 Location: Boca Raton, FL Posts: 6,733 iTrader: 0 / 0% Rep Power: 81	I would go 81.5......seen some good graphs with 81.5mm

10-13-2004, 03:03 PM	#6
sohcbuilder Member Join Date: May 2004 Posts: 79 iTrader: 0 / 0% Rep Power: 12	werd ... depends on what your setup is compression, depends wether your going na boosted or nitrous ....... as far as bore'n it if your going turbo you might as well bore and sleeve it if your going all motor id bore it 81 and be safe

10-13-2004, 05:21 PM	#8
civicious FüK-VTEC Join Date: Jun 2003 Age: 23 Posts: 8,550 iTrader: 3 / 100% Rep Power: 263	sleeve that bitch. 85mm.

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