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9-N EXHAUST MANIFOLD

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BRUCE THOMPSON

05-07-2003 13:14:02




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Hope someone can give me the reason my 9-N exhaust
manifold gets cherry red along with an extended part of the exhaust pipe during my mowing operation with a 5 foot finish mower..the gas tank vent is ok...the manifold gaskets are new..
I have not changed the timing or points ..and the carb seems to be adjusted correctly . The governor works ok under load .. This seems to be a recent problem after minor disassembly of the tractor for painting...I have done about everything I know to do..ANY SUGGESTIONS WELCOME.

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Bob

05-07-2003 23:47:54




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 Re: 9-N EXHAUST MANIFOLD in reply to BRUCE THOMPSON, 05-07-2003 13:14:02  
Centrifugal advance in distributor stuck or failed? (Or don't 9N's have an advance?)



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Hobo,NC

05-07-2003 15:00:42




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 Re: 9-N EXHAUST MANIFOLD in reply to BRUCE THOMPSON, 05-07-2003 13:14:02  
To lean will make it run hot. Dell is on the right track, read them plugs. If they are on the white side or very light tan richen the main jet a 1/8 turn out and check the plugs again after some use. The extra fuel will help cool the combuston chamber, and to much fuel will foul the plugs. You would like to see a light tan to dark tan color when looking at the plugs. Don't won't to start a debate but you should find #1 and 4 to look leaner than 2 and 3 . Because 1 and 4 intake runners are longer than 2 and 3. the middle two runners get most of the fuel. So I would look at 2 and 3 and when they were about right leave it their.

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Dell (WA)

05-07-2003 13:51:35




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 Re: 9-N EXHAUST MANIFOLD in reply to BRUCE THOMPSON, 05-07-2003 13:14:02  
Bruce..... ...they ALL glow red in the darkness after ya been plowin' all day. Infact, your daily driver would also glow red if'n ya could see it at nite. Problem is, you N-Tractor manifold and exhaust are out in the open for you to see it and not under the car body floorboards.

While there is a slight possiblility that your carb is mainjet too rich. Eazy Check: pull a sparkie and "read the insulator color" if white your sparkie is too hot, if sooty black, your carb mainjet is too rich, should be a light gray to light golden tan, if oily black yer burnin' oil..... ...Dell

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Ummm....

05-07-2003 14:02:21




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 Re: Re: 9-N EXHAUST MANIFOLD in reply to Dell (WA), 05-07-2003 13:51:35  
I thought that 'overheating' can be caused by too lean a mix...Not too rich...

Am I wrong?

Salmoneye



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uh . . . Dell (WA)

05-07-2003 14:29:49




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 Re: Re: Re: 9-N EXHAUST MANIFOLD in reply to Ummm...., 05-07-2003 14:02:21  
lean mixture overheats inside the engine, exhaust manifold gets hotter from rich mixture. at least that how I remembers it..... ...Dell, who has been wrong before and will be wrong again sometime



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Hmm Again...

05-07-2003 17:01:16




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 Re: Re: Re: Re: 9-N EXHAUST MANIFOLD in reply to uh . . . Dell (WA), 05-07-2003 14:29:49  
Never heard that there was a difference...Hot is hot...

Not disagreeing...But wouldn't you have to have a seriously excessive amount of unburnt fuel exiting the cylinders into the manifold and then 'burning' to make it appreciably hotter than the block/head? (yes I know that thee is water in there)..Wouldn't a 'condition' such as that NOT be as Bruce alludes to and running OK...Just seems too hot to him?...I am very familiar with the manifold glowing after a hard few hours of hogging right at dark...

It has always been a rule of thumb in outboards that if you are running hot then you are running too lean...That is the air cooled power-head as well as the exhaust...

Like I said...Not argueing...Trying to learn and understand...

Sincerely,

Salmoneye

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You are correct, Dell is wrong...............dave#1

05-07-2003 18:09:48




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 Re: Re: Re: Re: Re: 9-N EXHAUST MANIFOLD in reply to Hmm Again..., 05-07-2003 17:01:16  
Lean makes an engine run hotter, fuel is a coolant. On my High preformance snowmoblies I use ETG's in each tuned pipe, you use these to read "TEMP" of the exhaust gas, to hot?, too lean !

later, dave



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Les, TN

05-08-2003 12:13:02




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 Re: Re: Re: Re: Re: Re: 9-N EXHAUST MANIFOLD in reply to You are correct, Dell is wrong...............dave#1, 05-07-2003 18:09:48  
Yep, that's the way I read it. EGT (exhaust gas temp) is also often measured in light aircraft where you have the option of adjusting your mixture in flight. Too lean's too hot. It would take a bit of afterburner effect (and probably too far retarded timing which allows stuff to burn late in the cycle) to appreciably heat the exhaust manifold greater than what you get at the port. Those dudes are hot enyhows.

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