Bore

HKSenilyks · 09-11-2006

I'm thinking about boriing my block, What gains will there be from doing so? Would it be worth it if I don't make it a stroker?

**1ViciousGSX** · 09-11-2006

If you don't know the gains, I suggest you take it to somebody who does.

Boring out a block is for the soul purpose of moving up to the next size larger pistons. We do this for several reasons, scoring in the cylinder walls, seizing the piston in the block, cylinder worn too far out of round, etc.

As for stoking it, people have stroked engines on stock bores.

HKSenilyks · 09-11-2006

So just boring my block (with the correct size pistons) won't change how my motor performs?

**1ViciousGSX** · 09-11-2006

Not really, unless there is a problem with your engine that requires it.

Thor06 · 09-11-2006

There will be a small displacement gain but not enought to mean anything. If you are rebuilding, I would personally do it whether it really needs it or not. I would rather spend the extra couple bucks on some new pistons and a bore out just to be sure.

HKSenilyks · 09-12-2006

Quote:

Originally Posted by Thor06

There will be a small displacement gain but not enought to mean anything. If you are rebuilding, I would personally do it whether it really needs it or not. I would rather spend the extra couple bucks on some new pistons and a bore out just to be sure.

See this is my first rebuild, I bought a shell a few weeks back and i was thinking, "well if boring my cylinders will be a bit stronger, why not". I just dont want to build my motor to break.

**Shane@DBPerformance** · 09-12-2006

Boring your cylinders makes them weaker. Going .020" over is such a small displacement gain that any horsepower gains from it would be hard to even notice. How the new rings seat will possibly have a bigger effect on how the new motor performed. If you went from stock bore to something like .080", then you might seeing some performance gains from the increase in displacement, but you can't go too far before the cylinder walls are too thin for high HP.

**Goat Blower** · 09-12-2006

If you can bottle hone it and throw the stock pistons back in with new rings, you'll be in good shape in more ways than one.

sleepydsm · 09-12-2006

Unless the cylinder bores are f-ed up, you might as well just lightly hone the cylinders, and use the stock size pistons. And if you're considering stroking the engine (i.e. 2.3L), why not just go to a 2.4L block?

JiggahMan · 09-12-2006

Tits, if you're using the block that's sitting in the garage. Get it bored and honed, it needs it.

HKSenilyks · 09-12-2006

Yea I was thinking i would any way its got a little scoring on it. .30 what do you guys think

1QUICK4 · 09-12-2006

If you do any overbore do .020

HKSenilyks · 09-13-2006

.20 alright

Thor06 · 09-16-2006

Jake (EclipseGST) once told me that 2.0 blocks can go out quite a ways. 2.4 and 2.0 blocks use the same casting and the bore of the 2.0 blocks is 85mm while the 2.4 is 86mm. He says hes seen 2.4's go over .040 so you should be able to go .040 over on a 2.0 block and still be perfectly fine.

If you can get away with just honing and new rings by all means do that but I wouldnt be scared of boring the shit out if you have to especially if you only go out .020.

Super Bleeder!! · 09-16-2006

2.0 and 2.4 blocks are certainly not the same casting. their deck heights differ by like 6mm!

HKSenilyks · 09-18-2006

I'm just trying to build a 2.0 right now. Once my cars running I'm going to start on a stroker.

**1ViciousGSX** · 09-18-2006

Why build two? Build one right the first time.

**JET** · 09-18-2006

Quote:

Originally Posted by Super Bleeder!!

2.0 and 2.4 blocks are certainly not the same casting. their deck heights differ by like 6mm!

And why couldn't the 2.0 just be a smaller bore and be milled down 6mm more? It's only 1/4", which is 2 passes on cast iron. Maybe 45 seconds of machine time.

HKSenilyks · 09-19-2006

Quote:

Originally Posted by 1ViciousGSX

Why build two? Build one right the first time.

I'd love to and am still thinking about it, but theres one problem, $$$.

**Goat Blower** · 09-19-2006

Quote:

Originally Posted by JET

And why couldn't the 2.0 just be a smaller bore and be milled down 6mm more? It's only 1/4", which is 2 passes on cast iron. Maybe 45 seconds of machine time.

It might be real similar to a NT 2.0 block, but not a turbo block. Things like oil squirters and a knock sensor hole.

If you're going to build a motor with aftermarket pistons and rods, it's not any more expensive to just build a 2.4. But I wouldn't go more than .020 on a 2.4 block, there's been more than a few cases of cracked cylinders, like Momin's. You can bore the hell out of a 2.0, .060 is not unheard of.