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Muffler or straight pipe, which?

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Bruce

07-19-2001 17:56:01

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I recently got a straight pipe for my F20, which
had a muffler. It certainly sounds impressive, but
then I got to thinking, would I run the risk of
burning valves with no exhaust restriction. Also,
could you avoid burning valves by readjusting the
carb, or just run it with the straight stack and
don't worry about it. Any advice would be appreciated.

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Bill Smith

07-21-2001 14:41:19

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

The F-20 was released from factory with a 90 degree elbow that came out of the hood and then without hardly any height it shot out to the left. You should be able to set the carb with a straight pipe according to the manual. You shouldn't have any trouble with valve's while running it with straight pipe. If you do however it is most likely from a different cuase. I run a straight pipe on my F-20 and I run mufflers on the H's and M's or any tractor from that series.

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Joel Williams

07-21-2001 13:02:33

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

I don't think the engine really cares but your ears probably do. My grandpa's old C probably never knew what a muffler was. All it had from the time I can remember was the little stub sticking up out of the sheet metal, what there was of that. That tractor set outside for twenty years or more year round. Some times the stack was covered and sometimes not. It never failed to start and I can hear it running to this day dragging the lane and plowing snow. I remember watching them kick snow off of it to crank it and set on the seat. Loss of back pressure must not be too bad on them. Your ears are the important thing here. Any noise above 85 decibels can cause ear damage and 85 is not that loud. I have mufflers on all of mine except for the Super C and the 60. I only play with them though, no seriuous work. Look around at the next tractor pull you go to and see what is there. Bottom line is that it is really personal preference and safety. The muffler may capture the hot sparks under load and keep a field from catching fire too.

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Kendall

07-20-2001 14:47:20

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

My Super-A manual sez: "The exhaust muffler can be supplied for owners who desire quieter operation of their tractors. It reduces the sound of the exhaust to a quiet purr."
Yes it sounds cool with a straight pipe but much more pleasing in the long run with the putt-putt-purr sound of a muffler. With these old engines turning at a whopping 1300rpm wide open, I dont think backpressure is a factor.

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Bama Binder

07-20-2001 11:04:04

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

I run my Cub without muffler and just bought a new one for my Super H.

I'm trying to remember what I learned in Hotrod 101, but if I remember correctly, if you change the backpressure on the exhaust side, your mixture will be leaned out (why I can't recall). I don't know what carb adjustments you have on the F20, but if you can adjust the carb, use the same adjustment procedures you use to adjust the carb at full throttle and you won't have any worries about burned valves, etc.

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Scott

07-20-2001 07:33:53

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

All,
First and foremost, I respect and understand the points of view of all that have replied. However, I have to agree with Bill B. I use a strait pipe on my F-20. True I only use my F-20 for shows and the occational ride around the house. With this infrequent use, I take steps to ensure that my hearing is protected. I buy those 5 cent foam ear plugs.

V/R
Scott

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Bill B

07-20-2001 05:32:14

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

The F20 came from the factory without a muffler. It had a deflector that moved the exhaust left, away from the operator. I ran an F20 when I was a kid, and a day of harrowing was loud. If you only have the tractor for show, and occasional work, then I would use a straight pipe. If you use it all day, a muffler would be easier on your hearing. The repro deflectors from Rice are on back order last time I looked, but I made a pipe for mine by going to the auto parts store and looking in the exhaust pipe pile to find one with the right diameter and a bend, then cut off the extra.

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Zonie

07-20-2001 00:56:29

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

I have pulled my H with and with out the muffler and found that it pulls better with the muffler on.

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swamp yankee

07-20-2001 16:50:09

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Re: Re: Muffler or straight pipe, which? in reply to Zonie, 07-20-2001 00:56:29

Same for me too!

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J in Pa

07-19-2001 18:11:30

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Re: Muffler or straight pipe, which? in reply to Bruce, 07-19-2001 17:56:01

well bruce, you might be right about the valves.but i think it would be more important to keep your hearing. i have run tractors without a muffler and run heavy equipmentfor nearly 40 years.

the quieter it is the better it is for you and your hearing. i would think a muffler is your best bet. give it a try.

just my 2 cents worth.

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Ralph

07-19-2001 19:15:34

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Re: Re: Muffler or straight pipe, which? in reply to J in Pa, 07-19-2001 18:11:30

Jin Pa: Right on. There is no pain detected while your hearing is being damaged(from loud sounds). If there is a buzzing or ringing afterwards, you have recieved some permanent damage. Almost all damage will NOT heal and is permanent even tho the buzzing stops. Its least understood by young people who think their ears are an exception. Not true. Protect them. It is as dumb as not using eye protection when welding. ralph

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Ron

07-19-2001 19:52:42

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Re: Re: Re: Muffler or straight pipe, which? in reply to Ralph, 07-19-2001 19:15:34

I go with you guys, muffler the best for tractor and operator. All engines need a little back pressure and all operators need to hear when they retire.

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