Has anybody ever made or seen a header for a boat made in this way?

Great idea. I like it. It makes so much more sense than having to work with 2 headers and 2 pipes. I wonder if it's feasable though.

Physically I believe it is possible to have a good welder make it out of some of the headers already being made for rc boats, mainly so that the exhaust flange cooling units would also be built into the design. Of course I think it would be a good idea to step up the pipe post merger to at least a 1” inner diameter for obvious air flow reasons. I use 1” because it is the same diameter as all the 60cc exhaust pipes and canisters I have seen for sale.

I just haven’t seen anyone with one or using one and I was beginning to wonder if I was the only one to come up with such an idea or if it is because of the exhaust pipes everyone uses are tuned pipes. Cause, the only tuned pipe I have found for 60cc is 28” long and I have about 22” from pull-start coil to where the exhaust will need to exit the boat, without having 8-9” of ugly pipe sticking out the back…LOL

Probably would work i see a problem thou
I'm not an engine guru but i know the idea of a header is to make the distance between the cylinders and where the exhast gasses converge as close as possible...ie the tuned length of the cylinder in front would be longer then the rear one.

if you look at header pipes on v8 engines they twist and turn some pipes so the lengths are the same when they meet or as close as is possible...

i dont know if that would matter on a small scale or if it would be even more important??? maybee can get a mandrel bend into the rear cylinder if you get made out of stainless?? thats what i would do if making the same

food for thought .. i'm sure there are engine gurus out there that would know

Very good point. I have no idea if equal length headers are needed at this scale, but the idea does make good sence.

I wonder how I could have the headers bent to the same length before the header collector and still use the 13" rear dump canister pipe that I found?
hopefully there are some gurus out there reading this that could help me out with a little info or guidence on the subject.

roger

the reason i thought it might make an impact on designing a header is if you read the artical about tuning a pipe you are making changes as little as an eighth of an inch to tune so if one cylinder is longer by a few inches then when one is in tune the other would be out by a substantial percentage.

by the by when building 6 litere v8 headers the tollerances they get to in the headers is less then half an inch

while your designing headers see if you can make one to fit a miniture turbo too lol might'nt improve performance by much but it sure would look good ha ha

well it seems to me that if the motor is angled to the back of the boat at say 15-25 degrees, as is usually the case my idea is only good in theory.

Also in order to use the same length of exhaust pipe, it would stand that they would both have to be bent because air flow would need to be close in both pipes to produce equal turbulence for tuning purposes.
that being said, the pipes would need to be off-set from the header plane as close to 7/8" as possible...see my 3rd grader pc drawing...

That looks more like it...

Just to confuse the issue more...lol ... it may be that you dont have to have them at the same length but wher the " exhaust waves" meet and are " in phase"

I know i know i'm a Bastard lol

Just to clarify, in this instance would "in phase" mean that both pressure waves leave both pipes, or join forces so to speak at the same time? As that would be much easier to do, than to bend to equal length pipes in the small space I have to work with...
Even though, theoretically equal length pipes on this particular 2 cycle 2 cylinder engine would produce pressure waves 180 degrees out of phase… right?
So is the pressure wave in phase or even 180 degrees out of phase better or worse when combining both into a single canister muffler? I don’t have room for a 28” long tuned 60cc muffler…

I surely am approaching the limits of my knowledge and hope someone can shed a bit of engine knowledge on me about exhaust pressure waves and whether a 2 into 1 header should fuse at a point that produces on large pressure wave of a 1,2,1,2,1,2….180 degree out of phase pressure wave? Which would produce better mid high end performance…

I believe that I will just have whoever makes my headers make one of the original idea and one of the equal length bend idea also. But if the difference isnt enough for the eye and ear to see I dont know how I would be able to tell which is performing better!