How to get Hemi Sound Exhaust

ok, the general lee tractor that i am building has a 19hp Briggs I/C opposed twin on it, and to make it sound like what it will look like, i need a sutup for an exhaust to make it sound ALMOST like a hemi. any suggestions?

Straight pipes! as long as they are at least 18 inches long and have a good bend or two in them it wont hurt your motor... You should run them out the back under the fenders run a seperate one for each cylinder and for the last 8 inches put big 2 1/2 or 3 inch pipes but from the motor to the end use lik 3/4 inch or 5/8 inch pipe... hope this helps... Nice motor wont be hard to make that beast sound beastly

dylansrockinrigs wrote:

Straight pipes! as long as they are at least 18 inches long and have a good bend or two in them it wont hurt your motor... You should run them out the back under the fenders run a seperate one for each cylinder and for the last 8 inches put big 2 1/2 or 3 inch pipes but from the motor to the end use lik 3/4 inch or 5/8 inch pipe... hope this helps... Nice motor wont be hard to make that beast sound beastly

Yeah i would give this a try.
You should get somw chrome tips to.

Crome would look great... Especially with a fake scoop coming out of the hood

yeah it would, i think i can do that

I did pretty much the same thing when i was 10-11 was a loud tractor

Maybe best to make a resonance box, but this time you want it to echo, like multi cylinders.

Thunderdivine wrote:

Maybe best to make a resonance box, but this time you want it to echo, like multi cylinders.

Yeah you could give this a try.

Its been my experience that twins can only really sound like a twin. but a big resonant empty chamber might help.

A good audio tech could probably design a box that would bounce the sound wave around the can, with out too much volume loss.

Or you could design a system of flappers that shuttle individual exhaust pulses to separate pipes, and run 4 pipes out each side.

Actually, to think about it. A simple 4 vaned rotor in the exhaust flow would probably interrupt it enough to simulate 8 cylinder sound waves. It would take 1 in easch pipe with a crossover tube.

BTW, on the subject of eexhaust, a crossover tube is used to increase lower end torque on dual exhaust systems.

i like all your ideas, im still figuring out how to do this cheap, and i might have some old pipes from a old rat rod down in my scrap pile, would those work?

When i straight piped mine i used pipe from lowes and it was really sheap... you could use old spray paint cans for tips

thats a really cool idea, and i dont have to spend a dime because i have all that stuff in my scrap pile

there ya go

ok, but what will it sound like, will it sound like a loud twin, or a car engine?

My first straight pipe on a 3.5 horse sounded like a little dirtbike... I got it to sound almost like a harley when I was done

Yeah mine sounds like a harely.
All i did was pull of the muffler.

Mine was two feet of 3/4 inch piping and a small can with holes drilled in the sides inside of a large can with a flapper on top

ok... good ideas, im going to run them down to under the running boards, and curve them to have the tips pointed out, maybe put some expanded mesh metal on the end for support and looks, then use high heat spray paint to give it some color, or i could do that can idea, i dont know, whatever sounds cooler

Oh ok so you made a homemade can muffler.

I would try the can idea.

i can build both, because theyre simple, and pick one

i got straight pipes on my 16hp opposed sounds real good. i would stay with a straigh pipe.

ok... ill use the straight pipe, hopefully it sounds cool!

Ya it should goods.

I know how to tune 2 stroke, they're exhaust is like a non mowing supercharger. But not so familiar with tuning on 4 strokes.

Well imagine the engine is a speaker, then to make it sound massive it should help with a box with crossover pipes with no filling off course. Straight pipes are plain noisy and not very healthy for the engine I guess. Not in the long run, if you think about it, the flames it shoots out would be best kept in the cylinder to kick the piston down, and not to leave the cylinder