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1950 8N Power loss under load

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Rwacho

04-23-2006 15:51:36




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Hi All! Well, I thought things were going good and then I ran into something that"s got me stumped.

I"ve got an 1950 8N that"s sat for at least 8-9 years. 1. First thing I did was drain the tyranny, (3 Plugs), oil, and change oil filter. 2. I only changed the oil in the air filter. I replaced the dry rotted rubber connections on tube between air filter and carb.
3. Then I changed the spark plugs, the spark plug wires, replaced the coil with a 12V Accel coil.
4. Installed a ballast resistor because the coil measured 1.5 ohms. 5. Installed an alternator, Pertronix ignition system, and distributor cap. 6. Installed a new 12V battery and replaced the amp gauge with a voltmeter.
7. The dust cover that was in the distributor didn"t fit with the Pertronix, so I left that out. 8. Replaced all wiring and installed 12V headlamps.
9. I drained the gas and replaced the sediment bulb assembly and fuel line with new.
10. I rebuilt the carburetor with the lowest cost set (from TSC) (some gaskets and air shutter shaft). 11. I cleaned with solvent and blew out all passages in carburetor when it was apart. 12. I changed the manifold gasket and discovered when I removed the bolts, to drain the radiator.

It starts right up. I’ve got the idle set to a little under 500 RPM. Full throttle is ~2000 RPM with ignition timing at 17-18 degrees.

Here’s the problem, during a road test (no load just driving up a small incline) in third or forth gear, it starts to sputter, miss, and pop. I can stop on the incline with the clutch in and it runs fine. I can shift into 2nd, and it seems much better, but appears to be lacking power. I notice that there is condensate on the carb (outside) between the air shutter shaft and manifold (where it is obviously much warmer). If I choke it, it will stall

Anyone have some ideas or need any more info?

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Jason Simmerman

04-24-2006 12:03:05




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 15:51:36  
Sounds to me like a fuel problem Eithor you have junk in the tank or the carb jets are all gunked up.



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Jerry/MT

04-23-2006 20:10:57




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 15:51:36  
If you saw condensate on the side of the carb, a normal occurance, you could have it in spades in the carb venturi. In fact if the air temperature is less than about 45-50F and the humidity is high, you can form ice/frost. This is due to the evaporative cooling effect caused by the gasoline changing phase from liquid to vapor.
As old advises, try enrching your mixture slightly and see if that improves the situation. Also, make sure the your ignition advance is appropriate. 17-18o sounds a little small to me but I don't have much experience on the N series Fords.

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old

04-23-2006 16:52:56




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 15:51:36  
Spitting and pop most of the time means its running to lean. I'd try opening up the main jet just a little at a time and see if that helps. Could also be from sitting all those years and it still has stuck rings. Have you checked the compresion??



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Rwacho

04-23-2006 17:00:47




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 Re: 1950 8N Power loss under load in reply to old, 04-23-2006 16:52:56  
Haven’t check compression. What’s the thread pitch on the spark plugs? I almost picked up a compression gauge, but wasn’t sure about the right adapter. Do you have any suggestions on where to pick up a tester?



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old

04-23-2006 17:07:33




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 17:00:47  
Any good auto parts store. I got mine at O'riellys. Plug treads are standard sizes and every compression gauge I have ever had would fit all but the most uncommon size plug holes.



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Hobo,NC

04-23-2006 16:21:29




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 15:51:36  
there is condensate on the carb (outside) between the air shutter shaft and manifold, thats normal most just never see it. If you are a non beliver then start yer N up and fell the manifold were the carb bolts up it will be cold their and feel like a cold'n ready to drink and a few in" up you will feel the heat of the manifold, the fuel absorbs the heat.



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Bruce (VA)

04-23-2006 16:05:38




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 15:51:36  
Hmmmmm..... lets see: "10. I rebuilt the carburetor with the lowest cost set (from TSC)" followed by : "there is condensate on the carb (outside) between the air shutter shaft and manifold ". I'd suspect a direct correlation between the two. And, I'd also consider the advance wieghts in the distributor.



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Rwacho

04-23-2006 16:25:06




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 Re: 1950 8N Power loss under load in reply to Bruce (VA), 04-23-2006 16:05:38  
I guess the lowest cost set from TSC looks identical to the 8N-9590 from Dennis Carpenter which is called the basic repair kit. I bought some stuff from Dennis Carpenter, Yesterdays Tractors, and TSC. The packaging looks really similar! Yes, I didn't really "feel" much difference between the new and old shaft. Is the condensate normal?

When I monitored the ignition timing at full RPM and at idle. This corresponds to 17 degrees (full RPM) and 10 degrees (idle). Is this correct? I shorted the screws from the ignition kit so they wouldn't hit the weights.

Thanks! Ron

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Dell (WA)

04-23-2006 23:27:59




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 16:25:06  
Ron..... ..timing specs for 8N side-mount distributor (5-nipple cap) is 4*BTDC at IDLE. Centrifical advance is 17deg at 2000rpms. Too much advance, eather static or dynamic will cause hard starting and powerloss under load is probably pinging which can burn hole thru yer piston top. Re-set yer idle = 4*BTDC and then check yer dynamic advance at full rpms (17*BTDC)..... ....Dell, yer self-appointed sparkie-meister

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dave guest

04-25-2006 21:55:17




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 Re: 1950 8N Power loss under load in reply to Dell (WA), 04-23-2006 23:27:59  
Rwacho they sure do. Maybe they are rusted or stuck. Take a peek.



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Rwacho

04-24-2006 07:44:49




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 Re: 1950 8N Power loss under load in reply to Dell (WA), 04-23-2006 23:27:59  
I only get a span of 9 degrees change when I set the timing. I had checked with points and the new electronic ignition. From what the forum says, it should be a span of 13-14 degrees. I"m positive that the distributor weights are hitting any screws. They are the original as far as I know. Do distributor weights advance the ignition?



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Hobo,NC

04-23-2006 17:19:29




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 Re: 1950 8N Power loss under load in reply to Rwacho, 04-23-2006 16:25:06  
Timing izz close enoufh



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