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John Deere Tractors Discussion Forum
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60 straight pipe??

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jwilli

07-26-2006 10:59:06




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I have a 60 factory lp which has been converted to gasoline. I have been told not to run a straight pipe. Anything to this ir is it ok? The tractor will be used for shows and an occasional pull.




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MLD

07-27-2006 09:27:31




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 Re: 60 straight pipe?? in reply to jwilli, 07-26-2006 10:59:06  
You should be O.K., but the story I've heard is that with a stright pipe after shut down cold air can enter through the exhaust stack & hurt the piston rings because they are still hot. I don't know, I would think the hot exhaust pipe would keep the cold air out until everything cooled down together???? I still use my Deere's in the field so I have mufflers on them. For a show its fun to hear them "pop" loud but in the field, after a couple hours of it, especially under load, you get sick of it!!!

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720Deere

07-27-2006 11:41:55




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 Re: 60 straight pipe?? in reply to MLD, 07-27-2006 09:27:31  
Look down a JD muffler one time and see how much restriction there is to prohibit cold air flow down the exhaust. The regular stack-like mufflers are a straight through design with baffle cuts. These are not an automotive design with seperated inflow and outflow pipes and baffles.



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B-maniac

07-26-2006 18:13:06




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 Re: 60 straight pipe?? in reply to jwilli, 07-26-2006 10:59:06  
The reason you have been told not to is because in the past too many people have opened up the exhaust on their tractors,cars and whatever,only to end up with warped or burned valves.What these people failed to reallize is you have to richen up the fuel to keep that optimum air fuel ratio.Thats where you get the power gain.Not just from opening up the exhaust. A lean mixture burns too hot and will cause problems with valves and pistons.Fuel also acts as a coolant for valves and pistons.Open it up,richen it up and it will sound nice and run nicer.If you want it to even smell nice,try adding a gallon of 110 octane race fuel to 5 gal of gas.It won't make any more power ( you don't have high enough compression to take advantage of the octane) but it sure makes the exhaust smell nice.

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CLW

07-26-2006 11:19:14




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 Re: 60 straight pipe?? in reply to jwilli, 07-26-2006 10:59:06  
Straight pipe won't hurt the tractor. They will your ears if you spend too much time around them.



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Skyhawk Greg

07-26-2006 12:35:57




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 Re: 60 straight pipe?? in reply to CLW, 07-26-2006 11:19:14  
Should be OK. A well designed exhaust will extract as much as possible of the residual gases during the period of overlap between the opening of the inlet valve and the closing of the exhaust valve. This helps to extract more of the hot residual exhaust gas from the cylinder, and results in a lower final charge temperature. Secondly, it lowers the pressure in the cylinder and assists the initial flow of gas through the intake valve which can increase volumetric efficiency. You can design the exhaust any way that you like. Just be sure to adjust the carb for optimal performance with whatever pipe you use.

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