NG code engine replace rings wout rebore?

Ken Peirce · 27-06-16, 06:24 PM

All, The piston bores in my NG engine (120K miles) look nice. Do I have to have rebored or could I used new standard size piston rings in the engine? I am not sure about the UK, but reboring is quite expensive here.

Duffy3074 · 27-06-16, 07:00 PM

If there's no obvious wear and the bores haven't gone oval then there's no need to rebore it, a new set of rings gapped properly will be fine.
No step at the top of the bore I assume?

Error404 · 27-06-16, 07:17 PM

You need to measure them. Depending on the life the car has had, they are probably slightly oval. If you can't feel a step at the top the the bores with your finger nail, and you're not planning to go nuts with the engine (I'm guessing not on an NG

) they are likely fine to go again.
The main cost associated with a reborn is the new Pistons you need to go with it!

4v6 · 28-06-16, 04:34 PM

Dont forget if the piston rings are worn the grooves they sit in may also have worn too, which is why unless its a low miles engine itd be a false economy to re-ring it.

27-06-16, 07:00 PM	#2
Duffy3074 4 ring whore! Classic Audi Club Member Join Date: Aug 2015 Location: Dalgety Bay, Fife Posts: 2,078	If there's no obvious wear and the bores haven't gone oval then there's no need to rebore it, a new set of rings gapped properly will be fine. No step at the top of the bore I assume?

27-06-16, 07:17 PM	#3
Error404 Thobbing Member Classic Audi Club Member Join Date: Sep 2008 Location: Staffs Posts: 490	You need to measure them. Depending on the life the car has had, they are probably slightly oval. If you can't feel a step at the top the the bores with your finger nail, and you're not planning to go nuts with the engine (I'm guessing not on an NG ) they are likely fine to go again. The main cost associated with a reborn is the new Pistons you need to go with it!

28-06-16, 04:34 PM	#4
4v6 Ex Member Classic Audi Club Member Join Date: Dec 2007 Posts: 5,565	Dont forget if the piston rings are worn the grooves they sit in may also have worn too, which is why unless its a low miles engine itd be a false economy to re-ring it.