ok, I know that we have a 4g94, and that it's already bored out from a 4g93, so this is my question. If i sleeve my block and make it a 1.9L I assume I'll be able to push more psi, seeing as my piston walls will be thicker. Is this assumption correct? I figure, I'll be able to push more boost, so even though displacement will be less, the 1.9 will be able to be way more powerful than the 2.0 ever could have. I would really appreciate some feedback on this.Thanks in advance.

 

Sleeve the cylinders all you want but the rods and pistons still aren't going to be able to handle the lb/ft. past 9~.

 

even with aftermarket pistons and rods?

 

The block itself is not the problem. It's thick, it's iron, it's strong. It's the drivetrain, head, etc. that'll far apart on you before the block.

 

so the fact that our block is already bored out doesn't make the cylinder walls thin? Ant that in turn doesn't affect it's ability to hold boost? I figured with new pistons, rings, rods, valve springs etc. and sleeving the cylinder walls would allow me to hol more boost. Sorry if I was wrong, and thanks for the info!

 

Of course new pistons, rings, rods, valve springs etc. would allow more boost. That's called building an engine. But sleeving the block is only reserved for 1000HP GT-R's and Supras. Look around, it's a pretty scarce modification.

 

i was planning on getting everything made. i have a pretty good place to get my springs, valves etc. made. So even though our blocks are already bored out, the walls aren't that thin? I figured they probably were, guess I was wrong

 

Let's try to rephrase, do it if you think you need it (as in many lb/ft. of boost) albeit it isn't going to be cheap. Sleeving is usually reserved for engines that get overbored and the driver is looking for more durability. To take away your displacement is contrary. Plus, if you shrink cylinder size, so does your piston size which is again, contrary to what you're doing: more power.

 

yea piston size would shrink, but i figured i'd be able to push a lot more boost. Somewhere around 15psi. I was talking to someone about it and he said if my block was already bored out, that my cylinder walls would be too thin to hold that much boost. He told me I could probably sleeve them and then run a lot more boost to make up for the loss of displacement, and add even more power

 

http://www.turbomagazine.com/tech/01...ker/index.html

Sleeving a motor isn't shrinking displacement. Besides, never shrink displacement.

Sleeve = over-bore the block so big that the original cyl walls are too weak to hold cyls in place. To fix this problem, engine builders have to fabricate cyl wall jackets to hold these super over-pistons.

I wished that I could show you a pic of Lisa Kubo's over-bore block in SCC, but I can't find it.