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06-01-2005, 03:02 PM | #1 |
Scooby Specialist
Member#: 74589
Join Date: Nov 2004
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MAIC
Location: Richmond, VA
Vehicle:2000 94 Infiniti G20 90 S13 Coupe |
Question About Cylinder Walls.
i understand that when a car is new that the cylinder walls are scored slightly on the final hone so that the piston rings can seal properly, but after all of that is done, and say a car has 50k miles on it, are the cylinders completely smooth, or are there still "scratches" there to help retain oil for lubrication purposes?
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06-01-2005, 04:17 PM | #2 |
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Location: Cape Coral,FL
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yes the "HONE" marks are still there but, the sharp edges are now rounded. I've see blocks with 125,000 miles on them and there were still hone marks. How long they last is a function of how well the car was maintained, driven, oil used and of course quarily of materials. ed
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06-01-2005, 04:30 PM | #3 | |
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Join Date: Nov 2004
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Vehicle:2000 94 Infiniti G20 90 S13 Coupe |
Quote:
i was under the impression that after the initial few thousand miles that the walls were completley smooth. |
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06-01-2005, 06:16 PM | #4 |
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06-01-2005, 07:17 PM | #5 |
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....if the cyl walls were completely smooth, they wouldn't hold any oil and that is NOT what ya want....
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06-01-2005, 08:40 PM | #6 |
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Honing marks are in a cross hatch pattern at approximately 45 degrees. ed
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06-01-2005, 11:26 PM | #7 |
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Location: Auburn, WA
Vehicle:2014 Electric Datsun 2005 Adventure van |
Cross hatches on Suby engines are amazing.
I tore down an engine with well over 400k on it (actual mileage was unknown it had 200k when the body went to ****, went another 100k in another car, another 100k in another car and was still going strong when I bought said car) Anyhoo the thing looked new on the inside. EJ22 from a 1990 Legacy. My Domestic tech kept babbling about how it looked like his Chevy engine with 90k on it. He nearly **** himself when I told him the estimated mileage. |
06-02-2005, 12:35 AM | #8 |
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Vehicle:1990 Legacy wagon goes 12.387 @ 116.5 |
Steel cylinder, aluminium piston, ring floating on oil (you hope) = cross hatches forever.
The only way you will lose the cross hatching is if you are actually destroying your engine and shiz gets stuck between the piston and the wall. I am now on the third rebuild of my 1990 legacy block and you can be sure that it has all its crosshatches. |
06-02-2005, 12:45 AM | #9 |
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Yeah i changed some head gaskets on my moms 91 legacy with 200,000 miles on it and they were very visible.
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06-02-2005, 05:16 AM | #10 |
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same here, 180000kms and still completely there, in fact the wear on the rings was so small it was difficult to measure. These engines are remarkable.
Only thing worn was the mains showing a little scuffing and the top layer was worn away. |
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