Multi Cyl into one exp chamber

[Powerabout]

Ok I know you can have 2 cyl into a single chamber as per seadoo's and ski doo's
but can you put 4 or 6 cylinders?

[OUTBOARDER]

4 into 1 makin 200hp http://www.youtube.com/watch?v=Ceeyrmn2Pj4

[Powerabout]

Thanks for the find.
but 2 1000cc sled engines joined is almost double that ( with pipes that is and emission compliant)

[Fastjeff57]

Pretty sure you have to have pairs and multiples of pairs. In this case, 3 into 6 would work.

Jeff

[Powerabout]

Pretty sure you have to have pairs and multiples of pairs. In this case, 3 into 6 would work.

Jeff

there are plenty of seadoo things with 3 into 1.
I found a couple of bike threads with people looking for data to build 3 into 1 for the old Kawa's and Suzuki's. All they said was less peak power than 3 singles
Maybe 4 into 1 only works with a megaphone as OMC set a world record with?
I guess 77 140's have a 4 into one megaphone.
I guess there is very little data on 4 cyl as there are not many ( less GP 500 bikes with 4 pipes and tons of HP)

[Revengable]

Due to the increased size of the common header(for volume) the pulses at the exhaust port are weaker....But with enough time and $$$ (testing) they will work.

[Fastjeff57]

.."there are plenty of seadoo things with 3 into 1."

Correct. I shouldn't have used the word "pairs". But the pulses must be in a proper sequence, and 6 into 4 chambers is not.

Not

[Powerabout]

.."there are plenty of seadoo things with 3 into 1."

Correct. I shouldn't have used the word "pairs". But the pulses must be in a proper sequence, and 6 into 4 chambers is not.

Not

Would you run 4 pipes into one then into the divergent cone or 4 pipes into the cone so look like a 4 stroke header collector?

[Fastjeff57]

Absolutely. A zillion V-8 race car engines use that setup.

Jeff

[Powerabout]

Absolutely. A zillion V-8 race car engines use that setup.

Jeff

If it was a zillion v8 two stroke race cars I would have some data to work with hence the question.