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Unread 01-20-2005, 08:46 AM   #1
Missin44
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Join Date: Oct 2001
Posts: 148
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?

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Unread 01-20-2005, 10:22 AM   #2
gigihurt
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Location: pensacola,fl
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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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Unread 01-20-2005, 10:30 AM   #3
Missin44
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Thanks a lot, you cost me 5 bucks
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'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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Unread 01-20-2005, 12:09 PM   #4
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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Unread 01-20-2005, 12:30 PM   #5
JeepCrz
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1989 YJ Wrangler 
 
Join Date: Dec 2004
Location: Western PA
Posts: 211
It could of cost a lot more....
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