Can a 5SFE block be bored out?

Mister22u · 07-22-2007, 10:15 AM

I have rebuilt 4cyl engines before, but none requiring the cylinders to be bored out. I was told by my favorite machine shop that it's not possible with either 5- or the 3- MR2 blocks b/c the coolant jackets are too close to the cylinder walls.

He surmised this only because he could not locate piston or rod part#'s for these particular applications. I suppose you could do everything but that (which is what I've done in the past)

I'm just curious b/c I always like to have a spare engine on my project cars to mess with

Thanks for the help!

Mister22u

mr2man · 07-22-2007, 11:35 AM

You can bore either .020 over safely

MR2TRD1 · 07-22-2007, 12:59 PM

Your machinist is wack.

Mister22u · 07-22-2007, 05:28 PM

Quote:

Originally Posted by MR2TRD1

Your machinist is wack.

He is a little oldschool, but like I said his supposition was because his catalog did not contain replacement rods, pistons for these particular motors. He just sort of tilted his head to the side when I started talking about an engine that wasn't a 302, 305, or 350ci.

TomsMR2 · 07-22-2007, 05:50 PM

you can buy oversized pistons and rings from toyota themselves, you can certainly bore them out, its even recommended in the BGB.. of course its only a repair bore, you cant punch them out for a real displacement gain.

Jason.MZW20 · 07-22-2007, 06:53 PM

The 5S is already bored out 1mm over the 3S from the factory. The 2AZ runs a 1.2mm larger bore over the 5S and about 5mm more stroke to achieve only 0.2L of displacement with a completely new engine cast.

O/S pistons and bearings are usually for repair purposes only.

Mister22u · 07-22-2007, 09:27 PM

I meant for repair purposes; I probably should have made that clear.

Thanks for the help!

07-22-2007, 10:15 AM	#1 (permalink)
Mister22u Mad Skillz Join Date: Jul 2007 Location: Morgantown, WV Posts: 105 Thanks: 7 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	Can a 5SFE block be bored out? I have rebuilt 4cyl engines before, but none requiring the cylinders to be bored out. I was told by my favorite machine shop that it's not possible with either 5- or the 3- MR2 blocks b/c the coolant jackets are too close to the cylinder walls. He surmised this only because he could not locate piston or rod part#'s for these particular applications. I suppose you could do everything but that (which is what I've done in the past) I'm just curious b/c I always like to have a spare engine on my project cars to mess with Thanks for the help! Mister22u

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07-22-2007, 11:35 AM	#2 (permalink)
mr2man E85 Beast Join Date: Jan 2006 Location: South Dakota Posts: 62 Thanks: 3 Thanked 0 Times in 0 Posts My Google Map iTrader Rating: (1/100% )	You can bore either .020 over safely

07-22-2007, 12:59 PM	#3 (permalink)
MR2TRD1 pimpin' valet ;-) Join Date: Feb 2005 Location: Atlanta Posts: 1,918 Thanks: 1 Thanked 31 Times in 28 Posts iTrader Rating: (13/100% )	Your machinist is wack.

07-22-2007, 05:50 PM	#5 (permalink)
TomsMR2 Formerly Tom Brokaw Join Date: Feb 2005 Location: Bay Area Posts: 2,138 Thanks: 8 Thanked 165 Times in 138 Posts Blog Entries: 1 iTrader Rating: (0/0% )	you can buy oversized pistons and rings from toyota themselves, you can certainly bore them out, its even recommended in the BGB.. of course its only a repair bore, you cant punch them out for a real displacement gain.

07-22-2007, 06:53 PM	#6 (permalink)
Jason.MZW20 Torque Me!!! Join Date: Jul 2006 Location: Victorville, CA Posts: 691 Thanks: 9 Thanked 51 Times in 44 Posts Blog Entries: 5 iTrader Rating: (1/100% )	The 5S is already bored out 1mm over the 3S from the factory. The 2AZ runs a 1.2mm larger bore over the 5S and about 5mm more stroke to achieve only 0.2L of displacement with a completely new engine cast. O/S pistons and bearings are usually for repair purposes only.

07-22-2007, 09:27 PM	#7 (permalink)
Mister22u Mad Skillz Join Date: Jul 2007 Location: Morgantown, WV Posts: 105 Thanks: 7 Thanked 1 Time in 1 Post iTrader Rating: (0/0% )	I meant for repair purposes; I probably should have made that clear. Thanks for the help!