Question on split pipe exhaust

[sixbanger]

I'm working on a '50 dodge coronet lead sled it still has the original 230 flathead. I don't have enough money yet to split the manifold however some one has offered to split the pipes behind the stock manifold, would that sound any good or should I just wait to split a manifold.

Edited December 24, 2010 by sixbanger

[greg g]

Eye candy,just extra plumbing without the manifold. Unless it can be easily modified if/when you split your manifold or get headers.

Check member moose website for some home made alternative exhaust solutions.

[claybill]

wait.

[BobT-47P15]

If you just split the pipes, and use the right pair of mufflers, it can give

some of the split manifold sound. One local muffler shop guy says he can

make a good tone using certain mufflers he likes, but I've not heard a car

he did that to.

If you do split the pipes, then when you get to the manifold you will

already have the second pipe in place and only need to re-do the part

going to the manifold. A good muffler shop can make about anything

needed. I believe the longer size muffler would be desirable.

[Frank Elder]

Short muffler=hi-pitched rapping sound

inbetween=mellow growl

long muffler=quiet

[Robert Horne]

Rather than split my exhaust manifold, I have ask around this area if anyone could add on another flange to my manifold, so I can add another pipe. I have seen many V8 dual exhaust have a cross over pipe near the front of the exhaust to equalize backpressure. I believe adding another flange to my manifold rather than spit the manifold would have the equal backpressure effect.

[claybill]

pipes...

smaller diameter pipe..= high pitch

higher compression = high pitch

larger diameter pipe = lower pitch

short muffler-18-20in, = louder sound

longer (glaspak) 24in+ = more mellow

i have heard...smaller pipe manifold to muffler promotes tork...bigger pipe muffler to bumper has better flow...and after muffler doesnt interface with performance..a thought..a combiniation maybe.?

bill

[claybill]

correct robert..but it amounts to the same thing. costs the same etc etc.

[Andydodge]

There are at least 3 different exhaust manifolds used on the 23" Plymouth engine, each has the exhaust outlet in a different spot........this might not be an "exhaustive" list but.......there is one with the outlet between # 1 & # 2 exhaust ports, then another with the outlet between # 5 & # 6 exhaust ports and a third manifold that has the exhaust outlet after # 6 exhaust port.......My 41 Plymouth uses the second variant, with the exhaust dump between # 5 & # 6, so I got another of these manifolds & a front outlet manifold and cut both exhaust heat risors off, and had the locl blacksmith weld up the open ends.......I now have a pair of split manifolds.......lack of funds at present means I haven't mounted them onto the car but they should work quite well........andyd

[48mirage]

I did just as you suggest. I had a second outlet welded to my exhaust manifold just in front of the heat riser section. Works well.

[Don Coatney]

I did just as you suggest. I had a second outlet welded to my exhaust manifold just in front of the heat riser section. Works well.

Did you also weld the heat riser flapper in the closed position for a true split manifold?

[Young Ed]

What's the benifit of having a true split? As both my intakes I intend to use have a provision for the heat riser I was planning on leaving it intact. The best plan is probably what someone had on here with the heat riser intact but the manifold closed off after that and then the other one turned into a second manifold.

[blucarsdn]

I worked in a muffler/Hot Rod shop in the early '50's, all of the "factory made" Douglas and/or Belond split manifolds we used had the heat riser spot welded in place with a 1/2" hole burnt through the center of the H.R. plate. I would imagine the purpose being was to equalize the pressure within the manifold.

We spit a lot of manifolds in the shop for the non-mainstream cars, e.g. Buick, Packard. etc. The straight 8's were usually split 5 & 3 with larger mufflers used on the three side to balance the sound.

I liked the earlier comment about comparing twice pipes and dual carps to be like.... "peeing in a wet suit... nobody knows you did it, but it gives you a warm feeling"....Bill

[Don Coatney]

I worked in a muffler/Hot Rod shop in the early '50's, all of the "factory made" Douglas and/or Belond split manifolds we used had the heat riser spot welded in place with a 1/2" hole burnt through the center of the H.R. plate. I would imagine the purpose being was to equalize the pressure within the manifold.

We spit a lot of manifolds in the shop for the non-mainstream cars, e.g. Buick, Packard. etc. The straight 8's were usually split 5 & 3 with larger mufflers used on the three side to balance the sound.

I liked the earlier comment about comparing twice pipes and dual carps to be like.... "peeing in a wet suit... nobody knows you did it, but it gives you a warm feeling"....Bill

I sure would like to hear the sound of one of those Buicks with the 5/3 split. I have always had a soft spot for the Fireball engines.

PS; You can get the warm feeling and share it with everyone without the expense of a wet suit:D

[Don Coatney]

What's the benifit of having a true split?

I do not know the benefit on a Mopar flathead but I do like the sound.

On a SBC and possibly other V-8 applications I believe there is a dyno proven slight HP gain. But I dont think anyone has taken the time and expense to do this dyno study on a Mopar flathead.

[Plymouthy Adams]

I can only relate this on the subject of speed of light...this you can apply about you daily I am sure...

Light travels faster than sound. This is why some people appear bright until you hear them speak.

[BobT-47P15]

As I recall, some fellow a while back said they used to do a

2 and 4 split, instead of 3/3 on the six cylinder engines.

[Frank Elder]

Wasn't that chevy overhead valve sixes Bob?

[Don Coatney]

I can only relate this on the subject of speed of light...this you can apply about you daily I am sure...

Light travels faster than sound. This is why some people appear bright until you hear them speak.

So what is the speed of dark?

[Frank Elder]

So what is the speed of dark?

The same as a slow turtle on a fast day.:)If you consider the earth's rotation to be the turtle...........