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Ford 8N rebuilds


 
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sabujur
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Joined: 13 Jun 2020
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PostPosted: Sat Jun 13, 2020 7:50 am    Post subject: Ford 8N rebuilds Reply to specific post Reply with quote

I'm rebuilding my Ford 8N engine, and saw they have 3, and 4 ring pistons for sale. I haven't pulled my engine yet, does anyone know if there is an advantage of one ring style over the other? thanks.
 
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TheOldHokie
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Joined: 08 Apr 2005
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Location: Myersville, MD

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PostPosted: Sat Jun 13, 2020 8:18 am    Post subject: Re: Ford 8N rebuilds Reply to specific post Reply with quote

sabujur wrote:
(quoted from post at 11:50:12 06/13/20) I'm rebuilding my Ford 8N engine, and saw they have 3, and 4 ring pistons for sale. I haven't pulled my engine yet, does anyone know if there is an advantage of one ring style over the other? thanks.
Ford used both. Started OUT with four and switched to three. I think that pretty much indicates what their engineers thought.

TOH
 
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Jim WI
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PostPosted: Sat Jun 13, 2020 2:34 pm    Post subject: Re: Ford 8N rebuilds Reply to specific post Reply with quote

TheOldHokie wrote:
(quoted from post at 11:18:41 06/13/20)
sabujur wrote:
(quoted from post at 11:50:12 06/13/20) I'm rebuilding my Ford 8N engine, and saw they have 3, and 4 ring pistons for sale. I haven't pulled my engine yet, does anyone know if there is an advantage of one ring style over the other? thanks.
Ford used both. Started OUT with four and switched to three. I think that pretty much indicates what their engineers thought.

TOH

Either that or the bean-counters. At this remove it's hard to tell.
 
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mhb@ufe
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PostPosted: Sat Jun 13, 2020 2:59 pm    Post subject: Re: Ford 8N rebuilds Reply to specific post Reply with quote

The 4 ring piston has an additional oil ring near the bottom of the piston. Some believe this wipes the cylinders down too much causing excessive wear from lack of lubrication between the pistons and cylinder walls. Some say that is the reason Ford went to the 3 ring piston but I can't verify that.

Mark
 
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TheOldHokie
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PostPosted: Sat Jun 13, 2020 4:30 pm    Post subject: Re: Ford 8N rebuilds Reply to specific post Reply with quote

CVPost-mhb@ufe wrote:
(quoted from post at 18:59:49 06/13/20) The 4 ring piston has an additional oil ring near the bottom of the piston. Some believe this wipes the cylinders down too much causing excessive wear from lack of lubrication between the pistons and cylinder walls. Some say that is the reason Ford went to the 3 ring piston but I can't verify that.

Mark


Some also believe it was because of the the switch from steel to cast iron sleeves.

Nobody really knows but I think it's safe to say 3 ring pistons are the modern engineering standard.

TOH
 
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sabujur
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PostPosted: Sun Jun 14, 2020 7:24 am    Post subject: Re: Ford 8N rebuilds Reply to specific post Reply with quote

Thanks, I think I'll order the 3 ring pistons.
 
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