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Ford 9N, 2N & 8N Discussion Forum
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Late 8n vs 9n engine

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520 Pipefabricator

09-14-2020 19:39:20




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Hey guys i was planning a rebuild for this winter on my N (pending the results of a compression test) because she seems to be burning some oil. Question of the day... the late 8n was advertised to have a slightly higher compression ratio than the predecessor n's had. Is there a difference in the side distributor block's head, ie a smaller compression chamber? Basically, where does the compression difference come from on these tractors?

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JMOR

09-18-2020 00:39:26




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
Quoting Removed, click Modern View to seeShow me a picture of a flat top piston 9, 2, 8N



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Dean

09-19-2020 06:33:27




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 Re: Late 8n vs 9n engine in reply to JMOR, 09-18-2020 00:39:26  
Sorry, no photos.

Dean



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JMOR

09-16-2020 19:37:34




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
are you sure that all 9,2,8N pistons didn't have that slight dome?



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Dean

09-17-2020 08:22:06




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 Re: Late 8n vs 9n engine in reply to JMOR, 09-16-2020 19:37:34  
Absolutely certain? No.

All of the early models that I have seen without cylinder head had flat topped pistons.

None of the late 8N models that I have seen that had not been overhauled had domed pistons.

Dean



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JMOR

09-16-2020 13:44:35




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
Quoting Removed, click Modern View to seeI have only seen after-market M&W domed pistons, but I haven't seen everything, either.



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Dean

09-16-2020 16:59:04




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 Re: Late 8n vs 9n engine in reply to JMOR, 09-16-2020 13:44:35  
Late model 8N engines (not sure about early model 8N engines) have slightly domed pistons as original equipment.

Note, these are not the high compression "pop up" pistons once made by M & W and(maybe) others.

Dean



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Dean

09-16-2020 13:28:29




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
Pistons varried also.

Late 8N had slightly domed pistons (not sure about early 8N). 9/2N had flat topped pistons.

Dean



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HFJ

09-15-2020 14:21:32




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
i stand corrected about "all" 8N heads. ty JMOR and John Smith. learn sumfin new every day :)



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JMOR

09-15-2020 13:40:31




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
Quoting Removed, click Modern View to seeIn the head. The volume of the 'closed' part of the chamber (i.e., the portion away from the valves & plug) extends further into the "open" part of the chamber, thus reducing the total chamber volume.

First picture compares Ford heads. Second compares Sherman HI COMP (7.5:1) to Ford iron head. Sherman just went further in reducing the volume than Ford did between early & late. Get a Kerosene head for 4.75:1. :)



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jimtrs

09-15-2020 11:49:46




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
Quoting Removed, click Modern View to see

Question:

When do I need an engine rebuild?

Answer:

1) when the loss of power from a worn out engine is interfering with it's duties

2) when it smokes so bad you're sick of changing spark plugs :wink: :lol:



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wore out

09-14-2020 21:15:14




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
Quoting Removed, click Modern View to see

"she seems to be burning some oil"

How many hours do you "put on" this tractor in a year?

How much oil does it burn in a hundred hours?

A thorough "rebuild" of an "N" engine can easily cost well over a thousand bucks.

You can buy a LOT of engine oil for that.



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HFJ

09-14-2020 20:05:38




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 Re: Late 8n vs 9n engine in reply to 520 Pipefabricator, 09-14-2020 19:39:20  
yes, the 8N head has less room in the chamber, thereby raising compression slightly. i won't swear to it, but i was under the impression all 8N heads did this, not just the late ones.



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