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8N HP vs 9N

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Indiana Jones

10-12-2006 13:38:10




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Does the crank provide for the additional HP (compression) that the 8N has over the 9N/2N or is it a taller or domed piston piston (or both)? I've never owned a Ford tractor before now, so please bear with my ignorance!.




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Oldmax

12-18-2006 06:09:05




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 Re: 8N HP vs 9N in reply to Indiana Jones, 10-12-2006 13:38:10  
The compression ratio is the reason for more HP not the gear ratio or the amount of gears . the gear ratio has nothing to do with engine HP but would have something to do with power to wheels. the lower the ratio the more power to wheels .



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Chris Whitten

10-27-2006 10:40:36




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 Re: 8N HP vs 9N in reply to Indiana Jones, 10-12-2006 13:38:10  
Guys,
I'm new to these forums. I have been looking for tips on restoring my father's '52 8N. I'm an engineer and I can't help but put my 2 cents worth in here. Transmissions do have losses (especially some hydro-trannys). However the losses thru gear drives are minimal. Conservation of energy says (basically) "power in equals power out". The 8N produces more HP (period).



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Chris Whitten

10-27-2006 11:25:38




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 Re: 8N HP vs 9N in reply to Chris Whitten, 10-27-2006 10:40:36  
I agree. Gearing does play a huge role. "With a long enough lever arm you can move the earth" However, you will do it at a very slow rate.



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85_Ranger4x4

10-27-2006 11:10:30




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 Re: 8N HP vs 9N in reply to Chris Whitten, 10-27-2006 10:40:36  
That is true, but gearing as a big factor on what a machine can do. A lower gear will give you more pull at the wheels than a higher gear.



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souNdguy

10-16-2006 12:45:58




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 Re: 8N HP vs 9N in reply to Indiana Jones, 10-12-2006 13:38:10  
The hp difference is due to compression ratio. it is 6:1 ont he 9n/2n and 6.5:1 on the 8n.

That leaves you with head and pistons that can effect the comp ratio.

Soundguy



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Indiana Jones

10-12-2006 15:10:33




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 More info in reply to Indiana Jones, 10-12-2006 13:38:10  
Let me clarify a little. If I overhaul this 9N/2N (not sure which because serial # is unreadable), I"d like to make whatever (within reason) upgrades to get more horsies. All replies are appreciated.



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old

10-12-2006 17:53:41




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 Re: More info in reply to Indiana Jones, 10-12-2006 15:10:33  
On the faly head Ford engines like on the 9N, 2N and 8N theres little of nothing you can realy do to get more power. One reason the 8N is rated at a high HP is becuase of them haveing one more gear that the 9N/2N don't have. DON'T mill or shave the head any on them or your asking for big problems. Or in other words the only way you can really get more power out of one is to replace the engine with something like the funk convertion etc.

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Dan

10-18-2006 11:40:55




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 Re: More info in reply to old, 10-12-2006 17:53:41  
Old - gearing has NOTHING to do with increasing horsepower. Gearing only changes how that horsepower is applied. If you put a 9N engine on an 8N transmission - you still would have a lower horsepower tractor than if an 8N engine was on there.

As Sounder says - the horsepower increase was due to a higher compression (6.1 on a 9N/2N and very early 8Ns, and 6.5 on later 8Ns)- I am fairly sure it was from a redesigned head to allow better flow with less piston clearance. Sherman made a high compression aluminum head that got it up to 7.5 compression on the 9N/2N/ and front mount 8Ns!

HTH,
Dan

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old

10-18-2006 13:52:33




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 Re: More info in reply to Dan, 10-18-2006 11:40:55  
Dan, I have to agree and also disagree on the HP thing. Yes with the high compression it the 8N engine will have a little more HP but also the tanny makes a differance also. For instance, an Allis B and Allis C both have the very same engine but, not the same rear end/tranny and the C has more HP then the B because of the tranny. Or should I say it this way the C puts more pwoer to the ground even with the same HP engine as the B. It all depends on where you are takeing the HP reading from and how your doing it.

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85_Ranger4x4

10-23-2006 11:05:05




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 Re: More info in reply to old, 10-18-2006 13:52:33  
The allis C has a higher RPM than a B. If there is a difference trannys gearing it isn't enough to really make note of. Our C and B are about the same speedwise.



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old

10-12-2006 14:47:16




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 Re: 8N HP vs 9N in reply to Indiana Jones, 10-12-2006 13:38:10  
I think the added HP for the 8N over the 9N or 2N comes from a better intake and vlaves more then it does from any thing else. I know the pistons from one to the other will swap out but some have 4 rings and some 3 rings.



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