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Late 8n vs 9n engine

5

520 pipefabricator

Member
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?
 

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.
 
(quoted from post at 19:39:20 09/14/20) 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?
Click to expand...

"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.
 
(quoted from post at 00:15:14 09/15/20)
(quoted from post at 19:39:20 09/14/20) 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?
Click to expand...

"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.
Click to expand...

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:
 
(quoted from post at 22:39:20 09/14/20) 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?
Click to expand...
n 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. :)
519Q3Ks.jpg

6yY3XSr.jpg
 

i stand corrected about "all" 8N heads. ty JMOR and John Smith. learn sumfin new every day :)
 
Pistons varried also.

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

Dean
 
(quoted from post at 16:28:29 09/16/20) Pistons varried also.

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

Dean
Click to expand...
have only seen after-market M&W domed pistons, but I haven't seen everything, either.
 
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
 
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
 
(quoted from post at 11:22:06 09/17/20) 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
Click to expand...
how me a picture of a flat top piston 9, 2, 8N
 
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