Straight Pipe Verses Muffler

[Anonymous-0]

Any advantage to straight pipe? Muffler? H.P. gain? Loss? Dyno difference? Your thoughts...

 

[Anonymous-0]

A larger diameter straight pipe would flow better, not much more noise. Then a fuel mixture adjustment may be in order, then you would see a slight power gain. If noise is an issue then go with a free flowing muffler design. I can't say what gain for what engine and the pipes need to be the correct length. Someone once said install a straight pipe a little long and run a bead of color crayon down it's length, the part that does not melt then gets cut off of the length. That is optimum for power.

 

[Dblair]

I have seen an SMTA gain a couple with the muffler.

 

[fixerupper]

Well, here's the answer I have to the guys who claim a huge horsepower gain with a straightpipe. "If you were an engine manufacturer who just spent thousands of hours and millions of dollars developing an engine, would you choke it with a fifty dollar muffler"?. Jim

 

[Gary from Va]

I pull a Massey Harris 44. She'll pull stronger with a muffler. But, it's stock, too. I think stock engines do better with mufflers, they need the backpressure.

 

[300farmall]

No difference on a dyno, tried lots of combinations and they were all the same

 

[Anonymous-0]

On a Farmall C with 133cid engine we saw a 3hp gain from a muffler to a straight pipe.
It was on the dyno loaded with the muffler and it was backed down to let things cool down a little and the pipe was put on and it was loaded again.
And there was a 3hp jump!

 

[Hoss In ME]

They aint 2strokes so they do not need backpressure. do what the other post said with the crayon.Headers work best of all.When warmed up they help suck the exhaust out,no backpressure. Hoss