post #1 of Old 01-20-2005, 08:46 AM Thread Starter
Missin44
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Settle argument - Boring .030 in 4.0L?

I'm planning to bore my 4.0L .030 over (plus other stuff), my buddy says I'll need new pistons ..I say I won't. Who wins?


'92 YJ, 4.0L, 5 spd, OX Locked front, 4:10 gears, BDS 3.5" lift, reverse shackles, Ford 8.8 Limited-slip rear, York OBA, JB Conversions SYE Kit, CV driveshft, Centerforce II clutch, Big Daddy Step Rock Rails, Skid Row Top Prop, Big Daddy OffRoad Front Bumper, Yokahoma Geolander 32's, Rokmen Riddler differential cover
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post #2 of Old 01-20-2005, 10:22 AM
gigihurt
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Your buddy wins...... Pistons are designed to fit the bore with just a little slack, If you increase the bore size you will end up with to much and the pistons will slap the cylinder wall and grenade the piston skirts. But its your motor not mine.

They do sell oversize pistons for just such an event. If all you are doing is honeing the cylinders dont worry about new pistons just replace the rings. All in all a .030 over bore requires .030 pistons and rings and the same goes for .040 and .060.
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post #3 of Old 01-20-2005, 10:30 AM Thread Starter
Missin44
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Thanks a lot, you cost me 5 bucks

'92 YJ, 4.0L, 5 spd, OX Locked front, 4:10 gears, BDS 3.5" lift, reverse shackles, Ford 8.8 Limited-slip rear, York OBA, JB Conversions SYE Kit, CV driveshft, Centerforce II clutch, Big Daddy Step Rock Rails, Skid Row Top Prop, Big Daddy OffRoad Front Bumper, Yokahoma Geolander 32's, Rokmen Riddler differential cover
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post #4 of Old 01-20-2005, 12:09 PM
jeepdaddy2000
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Quote:
Originally Posted by Missin44
Thanks a lot, you cost me 5 bucks
No......you cost you 5 bucks
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post #5 of Old 01-20-2005, 12:30 PM
JeepCrz
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It could of cost a lot more....

2010 Jeep Liberty > Stock < wife's
1989 Jeep Wrangler > 4.0 conversion, 4" lift, 33's
1985 Jeep CJ7 > AMC 360, 4" Lift, 35's, locked front and rear, winch, Onboard Air, ect..
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