I over heard a couple of guy talking about header as they were looking at the lastest issue of SCC at Barnes & Nobles in West Covina. One dude was saying that the 4-1 was for high-end and 4-2-1 is much better for low-end and everyday uses. Then his friend said that there will be 4-3-1 coming out soon. It will be strong from low to high end. The smart one argued that such is not possible but his misinformed friend insisted that 4-3-1 will come out for sure; he saw it on the net. I think they are in high school or starting college. On the way home I told my wife about the conversation and she replied that it is not possible. No! she said what will you do with 1 extra exhaust port? I told her I have no idea but my car has (2) 3-1 header.
Will there be 4-3-1?

he he he

Mack

 

NOPE
probably just an idiot talking.

 

The kid was on Shrooms or something... Seeing double

 

sure... 4-3-1.. is that for a new inline 3 + 1 configuration???

 

4-3-1 would be a stupid configuration because 2 of the primaries would merge and 1 wouldn't. This would make the flow characteristics different between the cylinders.

 

What about a 4-8-5-3-1-2-1? What kind of gains could i see with this configuration?

 

Yeah, the flow would be crazy. I am sure it was someone that is talking out their ***.

 

3 cylinder turbo Sprint (Geo) manifold with the 4th tube for the dump pipe!!!

 

i'm waiting for my 4-4 header which leads to 4 separate exhausts and don't call it rice

 

hey, that B@N bookstore is close to where i live.

Jaysmy, you live in the area?

 

Yeah, lol

 

Sorry about the thread bump... Interestingly, the 2011-present Ford Mustang does use a 4-3-1 header. In particular the use of a 4-3-1 header gives the Shelby GT350 it's unique offbeat sound, even though it has a flatplane crankshaft like a Honda or Ferrari. [Of course the regular Mustang GT sounds offbeat and uneven anyway, so the header doesn't make much difference there.]

The 4-3-1 header design seems to used for packaging reason, yet it doesn't seem to reduce performance all that much. A 4-3-1 header is quite an elegant way of making an unequal length header for inline-four (or V8) engines, and I'm surprised that no aftermarket companies sell them for Honda engines for owners who want a unique sound (albeit perhaps not the most optimal performance)!

Shelby GT350 4-3-1 header design:

Shelby GT350 4-3-1 header