ring ridge develpoed 2 hours into breakin- hole was bored .20 over - now has a ridge

[CircleHook]

2.5 lt '98 Had one cylinder bore .20 over and install WSM approiate piston - after 2 hour break in I check leak down and found 80% on bored hole- obivosuly something wrong - pull head and there is a ring ridge on just bored piston- the hole looks wore also - hone marks not visable ??? No ring cuts on cylinder walls. Old holes have no ring ridge.
What did I do wrong? This is not my first one assemble.

[outasite]

You may have used the wrong ring for the bore material.What ring brand and # did you use.Is this a steel bore?

[phillnjack]

was the bore measured by your ? was it bored exactly 20 over ? and then add a few though for clearance with the hone ? if yes it wasn't enough.
this would cause a ridge and the loss of hone marks.
sounds like it needs to come out and be re-honed by a good few though. with another set of new rings too !!!.

was the piston at the shop that bored it out 20 over size ? and did they know about the clearance also needed .
like say 0040 clearance x 2.... because need to have the 0040 all around the piston not just one side ? ( hope this comes across like I mean ).

just my thoughts on it , I am probably miles off,

[Dave S]

I put old **** together and don't have those problems......wsm.......

[CircleHook]

Shop bored it was professional - they have done a number of engines for me and we did an identcal engine 3 months ago.
Piston was a WSM with factory rings backed in box with piston. Because of prior sucess with this shop and this brand piston - I did not measure anything- checked parts numbers and put it together. The ring ridge was at the bottom of the hole. No doubt it will be bare block by this weekend and probably going to have to be re-bored with new piston.
Be courious what shop has to say and we will get piston BEFORE we bore block this time.
Steel bore -2.5

[rock]

Main reason I bought a boring machine was shops not getting it right. They often do many different blocks in a days time and it is very easy to make an unintentional error. Other than that it would almost have to be incorrectly marked or packaged parts. I have witnessed both scenarios. Good luck.

Rock

[Chaz]

So a guy hurts a motor , strips apart , has it bored , can't wait to get it back .. !!!!!!!

Put's it back together in record time ...

Blow's up again ... same hole even

piston ??? bore job ???? broken crank ring ????

The piston , bore job .... !!!!!!!!! fixed the symptom !!!!!!!!!

This time fix the problem ...

Electrical misfire

Restricted / clogged

Oil line

" Injector

" Carb

Etc.............

PS ... wait till you run a few tanks thru it before setting any personal world speed records

[W2F a V-King]

Maybe there is an issue with the block's bore in that cylinder's sleeve is in?

Meaning it is possible to bore a cylinder and it be true and round when it leaves the machine shop. But if the bore that that sleeve is in is out of round it can cause issues with that cylinder when running warmed up to operating temps. Some pull the sleeves on troubled holes and check then true up the bore in the block before before re-sleeving.

Do you know if the machinist uses torque plates when boring?

He may have had the hole perfect, and the bad fit might have been in the piston.

Mic the hole and the piston and see what you have before you take it back to the shop.

Check the ring end gap.

[H2OPERF]

ring gap... if its in the ring travel area only

[CircleHook]

Maybe there is an issue with the block's bore in that cylinder's sleeve is in?

Meaning it is possible to bore a cylinder and it be true and round when it leaves the machine shop. But if the bore that that sleeve is in is out of round it can cause issues with that cylinder when running warmed up to operating temps. Some pull the sleeves on troubled holes and check then true up the bore in the block before before re-sleeving.

Do you know if the machinist uses torque plates when boring?

He may have had the hole perfect, and the bad fit might have been in the piston.

Mic the hole and the piston and see what you have before you take it back to the shop.

Check the ring end gap.

Parts came from Chris Carson- so pretty confident there- when I get it apart we will do some measuring.

[W2F a V-King]

Parts came from Chris Carson- so pretty confident there- when I get it apart we will do some measuring.

Yes, agreed. His reputation precedes him here for sure!
All is good then.

[perfmarine1]

Shop bored it was professional - they have done a number of engines for me and we did an identcal engine 3 months ago.
Piston was a WSM with factory rings backed in box with piston. Because of prior sucess with this shop and this brand piston - I did not measure anything- checked parts numbers and put it together. The ring ridge was at the bottom of the hole. No doubt it will be bare block by this weekend and probably going to have to be re-bored with new piston.
Be courious what shop has to say and we will get piston BEFORE we bore block this time.
Steel bore -2.5

Explain this statement?

[CircleHook]

The ridge is at the bottom front edge of the sleeve.
It is not all the way around- just at the bottom - maybe 25% around
like a Smiley face

[racer]

If ridge is all the way to the bottom of what was bored it and one side only it sounds like it was not bored straight or to the bottom of the cylinder. Photo may help.

[phillnjack]

I agree with racer, if its like you say then sounds like not bored correctly.
.