J

JacobAndEnzo

New Member

• Nov 13, 2024

• #1

Hello all,
I'm currently building a 2.25 petrol, it as been rebored with new pistons but the ring gap is a bit to small, the worst is 0,25mm and the best is 0,30mm, and from what I can tell it's supposed to be 0,38mm-0,50mm.
Can I use the ring i have or do have to source some other ones?

 

kermit_rr

Very

Full Member

• Nov 13, 2024

• #2

From the book...

 

Last edited: Nov 13, 2024

kermit_rr

Very

Full Member

• Nov 13, 2024

• #3

If the gap is too small then you'll most likely have problems as the get hot and expand

 

marjon

Well-Known Member

Full Member

• Nov 13, 2024

• #4

The ring gap can be filed, very carefully .

Have you checked the piston clearance?

J

 

J

JacobAndEnzo

New Member

• Nov 13, 2024

• #5

marjon said:

The ring gap can be filed, very carefully .

Have you checked the piston clearance?

J

Click to expand...

Thanks i will try that.

 

marjon

Well-Known Member

Full Member

• Nov 13, 2024

• #6

JacobAndEnzo said:

Thanks i will try that.

Click to expand...

I would check the piston clearance first. Did you supply the machine shop the pistons before rebore?

Check before you file.

J

 

kermit_rr

Very

Full Member

• Nov 13, 2024

• #7

marjon said:

I would check the piston clearance first. Did you supply the machine shop the pistons before rebore?

Check before you file.

J

Click to expand...

The piston ring gap has nothing to do with piston clearance in the bore?

 

marjon

Well-Known Member

Full Member

• Nov 13, 2024

• #8

kermit_rr said:

The piston ring gap has nothing to do with piston clearance in the bore?

Click to expand...

No that's true. But.
If the bore is too tight for the rings is it to tight for the pistons?
Not all +20/? are the same.

Always best to measure a few times before get the grinder out .

J