Cylinder wall

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RAYMOND259

Member

Nov 14, 2006

56

0

7

Dec 6, 2006

#1

• Dec 6, 2006

• #1

I got my block back from the local machine shop each cylinder wall have a line in it I ask them about it they say it normal because of the bored gauge tool.I can feel it with my finger nail just little bit.it run top to the bored and to the bottom

 

z2o_what

Member

Mar 31, 2005

309

1

19

princeton, WV

Dec 6, 2006

#2

• Dec 6, 2006

• #2

are you asking if that is normal??
i have never had a block bored, but i've seen blocks that have been and i dont remember any lines, but if the shop said its normal then it will probaly be ok.

is it a well-known shop in you area or are they new?

 

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RAYMOND259

Member

Nov 14, 2006

56

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7

Dec 6, 2006

#3

• Dec 6, 2006

• #3

They are well know shop but they do bad machine work, I'm not happy with them

 

z2o_what

Member

Mar 31, 2005

309

1

19

princeton, WV

Dec 6, 2006

#4

• Dec 6, 2006

• #4

RAYMOND259 said:

They are well know shop but they do bad machine work, I'm not happy with them

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i know what you mean, there is a shop like that in my town. i would try to find someone else that has also had an engine bored from that shop and see if they had the same problem.

 

ozanracing

New Member

Nov 28, 2006

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Dec 6, 2006

#5

• Dec 6, 2006

• #5

When I bore an engine it is to cut metal out of the walls. When I hone (for moly-faced rings) I will make the wall almost smooth as glass. (400grit finishing stone) There should be no 'groove' in the walls or you will have excessive blow-by, reduction in compression, worn out rings (faster than normal) Not good.

 

stangbear427

Active Member

Nov 11, 2002

2,401

1

49

New England

Dec 6, 2006

#6

• Dec 6, 2006

• #6

^Agreed. It's pointless to pay someone to machine a block if they're only going to do that quality of work- you may as well not have bothered freshening it up to begin with.

 

mstngjoe

Founding Member

Jul 26, 2002

428

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0

Oregon

Dec 6, 2006

#7

• Dec 6, 2006

• #7

A freshly bored & honed cylinder should not have a "line" that you can catch your nail on from top to bottom.

 

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RAYMOND259

Member

Nov 14, 2006

56

0

7

Dec 6, 2006

#8

• Dec 6, 2006

• #8

I will take a picture of it show you guys

 

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86bluecobra

Advanced Member

Dec 20, 2004

4,265

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69

B.C. Canada

Dec 6, 2006

#9

• Dec 6, 2006

• #9

I would think that there should not be a line. i have never seen one in any block i have seen. I would say they did something wrong.

 

retro50

New Member

Jul 15, 2003

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Plymouth,MA

Dec 6, 2006

#10

• Dec 6, 2006

• #10

Those are called witness marks. They are from the dial bore guage. The bore guage is spring loaded on the centralizer points. So they lightly touch the walls and leave witness marks due to the spring tension. They do not hurt anything. Most shops will hone out the bore to the final size and keep guaging the bore untill the final size is achieved. Once it is achieved then they will give the bore a couple of brush strokes to get rid of the witness marks. Some shops do this and some don't. If you can feel them with your fingernail, take it back and have them brush up the bore a bit.

 

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RAYMOND259

Member

Nov 14, 2006

56

0

7

Dec 7, 2006

#11

• Dec 7, 2006

• #11

They say they cant honed it anymore because the bored be too big for the pistons

 

Modular2v

Founding Member

Jun 30, 2002

3,222

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99

oklahoma

Dec 7, 2006

#12

• Dec 7, 2006

• #12

RAYMOND259 said:

They say they cant honed it anymore because the bored be too big for the pistons

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honeing wont change the bore drastically enough to warrent new pistons.