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8n Pistons and cam for more power?

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05-30-2007 18:49:31

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Would like to rebuild my 8n. But with more power than stock. Maybe with after market pistons and camshaft. Does any one know if parts like this are out there? If so who?

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Duner Wi

05-31-2007 05:28:22

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
The 1941 -42 Ford PU had a 4 cyl. option which was
the N tractor engine. HP 40 @ 3200RPM and 84 lbs. torque at 1600 RPM . 119.5 cu. in. and 6.10 CR.
I don't know if the cam was differentv grind or not but I suspect so.It would have a fuel pump drive on it.

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05-31-2007 03:50:41

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  

As the others have said, there is little to be gained for normal (non competition) tractor usage by modifying the 8N engine.

That said, you should try to maximize compression by using the correct parts. Replacement pistons are available both flat-topped and slightly domed. The domed ones are good for nearly 3HP and cause no interference with the stock cylinder head.

You may also wish to deck the block slightly and clean up the head surface. Do not take much material off of either or you will have interference problems.

Compression translates closely into torque, and this is what you need for a tractor engine.


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05-30-2007 22:31:57

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
Turbo Charge it using a 4 cylinder cars turbo and you will get more power with out the problems caused by grinding a special cam and higher compression to get more HP thru higher RPMs. Mark H.

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05-30-2007 20:13:36

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
How about doing this: A guy in India has been cutting a groove in cylinder heads (flat and ohv) and been getting good gains in torque and fuel economy. Torque is more important for a tractor than horsepower. Horsepower is a function of engine speed, you need rpms to make horsepower. Torque works at lower engine speeds.
Or look at it this way. To get your car up a steep hill, you downshift and rev the engine, and it makes lots of horsepower to get up the hill. But a high torque engine allows you to carry on up the hill in high gear without losing speed.
His groove works by acting like a high velocity nozzle on the compression stroke, to really mix and vaporize the fuel/air mix, and then on ignition, it acts as a passage to carry the flame out to the very edge of the cylinder and get that part burning earlier. So all the fuel mix burns sooner while the piston is up and makes for a stronger push on the piston, more torque.
Some drag racers are using it and reporting success. Read about it here:

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06-01-2007 10:29:04

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 Re: 8n Pistons and cam for more power? in reply to Randyr, 05-30-2007 20:13:36  
Very interesting! I wish I would have known this when I rebuilt my son's 318 pu engine.

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dan hill

05-31-2007 03:41:43

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 Re: 8n Pistons and cam for more power? in reply to K.LaRue-VA, 05-30-2007 20:08:21  
Big problem is that most tractor work is done at 1000 to 1200 rpm.I find my 600 plows, bales hay and runs the cordwood saw in this range.I cant understand why anyone gets taken in by this dual exhaust idea.The 6 cy and v8 conversions are not practical.The V8 60 HP has the same cubic inches as the 4 cy engine.The 60 v8 makes more sense but the engines are scarce.One fellow who used a 6 cy conversion said that every time the plow hooked on a root a transmission gear busted.Another problem with more horsepower is wheel spin.The tractor needs more weight as hp increases.Fellows who have put on the dual exhaust always claim an increase in power.After spending over 400.00 they have to think they have an increase in hp.I would like to see the sellers of the dual exhaust system provide a before and after Dyno test and noise figures.My Ford charts show the the 100 HP v8 generates 35 to 40 hp in the 1000 to 1500 rpm range.This would be quite a strain on a trans mission designed for 24 hp.

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Dell (WA)

05-30-2007 19:55:17

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
Chris.........most "hot-rod" hop-ups gain power thru more RPM's, which demand BREATHING. Yer 26hp 6.5:1 low compression flathead does NOT do high-compression well either. You can "mill" yer flathead for 1/16" before the pistons start pounding aginst the flathead. You might have increased the compression from 6.5 to 6.7, notta big gain there is it? Other hot-roding tricks like dual-carbs support high rpms. What about a "cam"??? Again, cams are used for hi-rpms improvements. Yeah, you can pull the sleeves and use flathead Mercury pistons for about 5-hp increase due to increased displacement and works with low-rpms.

The "ungoverned" 119cu/in flathead was used in 1940 & 41 for intown delivery sedans and pickups and rated for 43hp? Then along came WW2 and Willys Jeep could NOT make enuff engines fast'enuff so some of the very early WW2 Jeeps also used the ungoverned N-Ford flathead engine.

OK, iff'n yer really interested in more POWER, consider using a BIG Chevy 454-V8 SMOG-PUMP as a belt driven SUPERCHARGER. Use a carb for the NAA so the mouth of carb faces the smog-pump. Brackets are on your own shadetree cleverness. Also check hot-rodding books about supercharging.

You doubt about SMOG-PUMP??? Do a "google" search for "Dirt Cheap Supercharger" by Steven A Richmond.........Dell

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john hunt

05-30-2007 19:44:52

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
what are going do with it after you do it super it up.

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05-30-2007 19:30:40

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
I agree with sound. If you want more power out of an N the best way is to put in a V-8 or a 6cylinder engine by way of the funk thing. Very hard to get much if any more out of that flat head 4 cylinder and if you do it cost you more then it would to buy a bigger tractor

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05-30-2007 19:01:54

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
Technically, yes.. you could get domed pistons.. or drop the liners and run mercury pistons in the bare bore.. and perhaps relieve your head a little to allow for valve clearance then shave it for comp ratio... however.. the gains are very small.

There has been negligible discusion on mini-superchargers.. etc.. but again.. the gains are diminishing compaired to the cash outlay.

I believe someone here on the list has used the following phrases:

" nothing better than cubic inches at souping up an engine than cubic cash"

and my favorite:

" How fast is your wallet "

In the end, you can sink enough money into an 8n engine to get it up perhaps 6 or so HP.. and nearly double the cost of the thing... Better bet if ya want 33 hp is to sell the 8n and then get a naa or 600 series tractor that has an OHV 134ci engine vs that flatty l head of 119ci that don't breathe good.

You could also move up to an 800 with a 172ci engine in the same package size as the 134.

Or.. if ya like the 8n look.. you can get v6 and v8 conversions and repower it.

All are spendy ways to get hp.. except for just buying a tractor with the HP you want.. etc..


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05-30-2007 18:56:21

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 Re: 8n Pistons and cam for more power? in reply to ChrisNC1, 05-30-2007 18:49:31  
Well - Some have used old Mercury pistons straight in the bores without sleeves, and I "guess" you could still find someone who can engineer more lift on your camshaft and build you a custom shaft. Heck - some have even hooked bath air cleaner, and put a dual exhaust system in place. You will still face the age old problem though - even with a 20% increase in power, you are still only talking about spending several hundred dollars for a few horsepower increase. As they say, there is no replacement for displacement...

Do a search for Dell's smog pump "blower" suggestion - sounds like the best idea for the money if you are really looking for some gains at a reasonable cost.


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