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Ford 9N, 2N & 8N Discussion Forum
Show Parts for Model:

Re: Pistons in - how much drag is acceptable?

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TheOldHokie

08-26-2013 05:27:45
71.176.183.238



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Quoting Removed, click Modern View to see.

Where did you get that idea? A freshly bored and honed cylinder should have as close to zero taper as the engine builder can get. High dollar engine boring and honing machinery goes to great lengths to ensure that. A top quality CNC engine shop shoots for something less than .0005 maximum taper - a low budget shop with a manual boring bar and hone is working closer to .001. The Ford 120 specification for maximum allowable cylinder taper when fitting new parts to a worn cylinder is .004, max out off round is .003.

TOH

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ZANE

08-30-2013 06:09:19
98.83.59.238



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 Re: Pistons in - how much drag is acceptable? in reply to TheOldHokie, 08-26-2013 05:27:45  
Exactly!

Zane



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36 coupe

08-26-2013 14:51:41
69.49.147.167



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 Re: Pistons in - how much drag is acceptable? in reply to TheOldHokie, 08-26-2013 05:27:45  
He did not bore the cylinder EXPERT.



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TheOldHokie

08-26-2013 16:10:03
71.176.183.238



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 Re: Pistons in - how much drag is acceptable? in reply to 36 coupe, 08-26-2013 14:51:41  

36 coupe said: (quoted from post at 17:51:41 08/26/13) He did not bore the cylinder EXPERT.


I realize that and that is what I was attempting to clarify. There is no MUST when it comes to taper - the cylinders MAY have some taper if they are worn.
At this point in my life I no longer consider myself to be an expert in anything. When I was younger I thought I was an expert in some very specific technical areas of my chosen profession. As I got a bit older and my professional circle got a little bigger I demoted myself from "expert" to "knowledgeable". From there it was all down hill to simply "experienced in a wide range of topics" :cry:

The one thing I have learned in that developmental journey is to continually strive to readily acknowledge my errors with a semblance of grace and humility :idea:
TOH
This post was edited by TheOldHokie at 18:30:59 08/26/13.

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Ultradog MN

08-26-2013 14:20:38
174.20.243.37



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 Re: Pistons in - how much drag is acceptable? in reply to TheOldHokie, 08-26-2013 05:27:45  
TOH,
Coupe doesn't need my defense but one could take his reply to mean that since Garmo did not replace the sleeves he "should" have some taper.



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TheOldHokie

08-26-2013 14:29:06
71.176.183.238



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 Re: Pistons in - how much drag is acceptable? in reply to Ultradog MN, 08-26-2013 14:20:38  

Ultradog MN said: (quoted from post at 17:20:38 08/26/13) TOH,

Coupe doesn't need my defense but one could take his reply to mean that since Garmo did not replace the sleeves he "should" have some taper.


I considered that before I replied which is why I added teh bit about new rings in a worn cylinder. But it's not what he said so just consider my reply a more detailed clarification on the taper issue.

TOH
This post was edited by TheOldHokie at 14:30:47 08/26/13.

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