Safe to Bore the Block .60 Over?

[1G-3G Eclipses]

I have some 4G64 with 4G63 Wiseco Pistons from my Turbo 3G project.

I wont be using these (bored the 4G64 block out some), so I was wondering if they would fit in my 1G TSi.

That would mean I'd need to bore the block .60 over.
Is this safe? Would there be enough cylinder wall material?

Thanks in advance.

 

[1G-3G Eclipses]

I've read a couple people saying they have done it .60 over. But they were people who had no mods in their profile and were new members. Or members who's posts just didn't seem like they knew all that much.

So was hoping for some info from a more reliable source.
I understand that I would run the risk of not being able to bore out more if there were a problem. But with these blocks not being too expensive and the fact that these are $450 pistons I'd be willing to take the chance. Just wanna know if the chance I'd be taking is cracked cylinder walls.

 

[BogusSVO]

have the block sonic checked, it will let the machinist know if the block sufferd core shift, and if there is enough cylinder wall metal to suppoert that over bore.

 

[1G-3G Eclipses]

have the block sonic checked, it will let the machinist know if the block sufferd core shift, and if there is enough cylinder wall metal to suppoert that over bore.

Would the shop know how much metal is needed?
Or is that block dependant?

 

[Mr PopUps]

The 4G63 max with safety i believe is .040. Why would you need .060 in the first place?

 

[1G-3G Eclipses]

I stated in the first post that I would LIKE to use the 4g64 with 4g63 head pistons I have from my 3G project. And that would require me to go .60 over.

Obviously its not a neccessity but I just figured I could save some money. So I was seeing if it was something that I could do safely.

 

[BogusSVO]

Would the shop know how much metal is needed?
Or is that block dependant?

thats what the sonic test tells the machinist, it lets him know the wall thickness all thu the bore.

Once he knows that, then he can inform you if that block can go the .060 you want to go.

 

[DSMsamurai666]

The most you can bore a 4g63 to is 87.5mm.

 

[Mr PopUps]

I stated in the first post that I would LIKE to use the 4g64 with 4g63 head pistons I have from my 3G project. And that would require me to go .60 over.

Obviously its not a neccessity but I just figured I could save some money. So I was seeing if it was something that I could do safely.

No you didnt, you said "I have some 4G64 with 4G63 Wiseco Pistons from my Turbo 3G project." 4G64 what?

 

[Theo90TSIAWD]

Bring it into a machine shop and see what they say, they are the experts, not us. Be sure to post the results.

 

[1G-3G Eclipses]

The most you can bore a 4g63 to is 87.5mm.

Not saying you are wrong at all (honestly I'm hoping you are right, will save me money ) but where did you get this info, or did you do some math or what?
Thanks!

Bring it into a machine shop and see what they say, they are the experts, not us. Be sure to post the results.

Up your post count in a different thread please.

No you didnt, you said "I have some 4G64 with 4G63 Wiseco Pistons from my Turbo 3G project." 4G64 what?

4G64.... with a 4G63 Head.
C'mon now. Sorry I left out a word but I would imagine with the word piston in there it could of been pulled together.



And thats BogusSVO I SHOULD be dropping it off tuesday morning.

 

[Burnett03]

.060 is way to far. You risk cracking a cylinder and or overheating the motor.

 

[1G-3G Eclipses]

.060 is way to far. You risk cracking a cylinder and or overheating the motor.

60 being way too far... making 40 a little bit too far... leaving 20 and the only safe option?

Im sorry guys, but for something like this I was hoping for an answer that had some sort of fact to back it up.

But thanks to everyone for the input.

 

[eclipsh]

In case they won't work have you considered:

A: Selling the pistons to someone doing a 2.4 project and buying new ones for your 1g.

B: Finding a 2.4 block for your 1g to put the combo into.

C: Finding someone who would want to trade.

On that note, from what I've gathered the 63 and 64 blocks are the same castings just with deck height and bore differences. So technically it SHOULD be possible so long as you don't have bubbles in your casting. On the other hand, I've also got some experienced friends who talk about the 64 block having too thin of walls between the pistons and various forms of grenading engines because of it.

That said, since I just don't know, are the wrist pins in the same place for the 63-64 or will you have issues there as well?

 

[jrohner]

Mine is .+040, so I can't see +.060 as being 'way too far'.

 

[TunaTalon]

On that note, from what I've gathered the 63 and 64 blocks are the same castings just with deck height and bore differences. So technically it SHOULD be possible so long as you don't have bubbles in your casting. On the other hand, I've also got some experienced friends who talk about the 64 block having too thin of walls between the pistons and various forms of grenading engines because of it.

Nick,
That is the most likely way to manufacture multiple versions of the same engine with only machining differences. I have read on forums that all 4G6X blocks are from the same castings but have been unable to verify from a “reliable” source.

If true, that simple fact would have answered several threads such as this. How can we state with authority that 4G63 and 4G64 blocks are from the same castings? For what its worth, I tried Google to a stand off about a year ago.

And the stock wrist pins are in the same location for the 4G63 and 4G64. When building up a 4G64 it’s possible to get a better rod ratio by using stroker pistons and longer rods.

 

[Theo90TSIAWD]

Not saying you are wrong at all (honestly I'm hoping you are right, will save me money ) but where did you get this info, or did you do some math or what?
Thanks!



Up your post count in a different thread please.



4G64.... with a 4G63 Head.
C'mon now. Sorry I left out a word but I would imagine with the word piston in there it could of been pulled together.



And thats BogusSVO I SHOULD be dropping it off tuesday morning.

Some people have better things to worry about than their post count, but thanks for being an internet bad ass, I have lots of fear and respect for you now.

Everyone is tossing out their best guess, are you really going to put your engine block on the line based on an internet guess? Take is some where that you can get an expert opinion.

 

[TSIfreek]

.060 is way to far. You risk cracking a cylinder and or overheating the motor.

I agree with Ryan here. The most I would bore a 4G63 is .030 over. The more metal you take out the weaker the block gets and cracking is a bigger possibility.

 

[BogusSVO]

Everyone is tossing out their best guess, are you really going to put your engine block on the line based on an internet guess? Take is some where that you can get an expert opinion.

Thats why I keep saying have the block sonic tested, it takes the guess work out, then you know how thick the walls are, and how far the bore can go.


NOT all machine shops have one, but the better shops will, you may have to call around to find a shop that can perform this sonic test.

 

[Mr PopUps]

4G64.... with a 4G63 Head.
C'mon now. Sorry I left out a word but I would imagine with the word piston in there it could of been pulled together.

You have a 4G63 head with 4G63 pistons? You still arent making any sense .

 

[USER_22]

Just sell the pistons and get the right 1s bro. Trying to save money can end up costing you a blown motor. One thing you have to learn is you can't cheap out when it comes to engine internals and turbos. Bore it to a safe .20 or .30 and be done with it....