Shorty vs Full Length Headers

[Mr. Land Yacht]

I just dont want to go thru the hassle of having them modified further.

[cld783]

those are long tubes.

these are mid-legnth

yes i know they are longtubes but they are a good choice because they are shorter than other longtube designs for the 302.

[P72Ford]

I'm pretty sure it applies at least in part, but I think it'd be a bigger deal with stepped-diameter headers and the like, or maybe figuring how the transitions from 1-5/8" primaries (up to 8.3 square inches total cross-section per side) to the 3" collector (about 7 square inches) to the existing 2" mid-pipes (up to 3.14 square inches) will affect flow. Far more interesting theoretical fodder can be derived from applying waveform theory to the individual exhaust pulses, but that requires an awful lot of information such as pulse frequency, order in which the pulses arrive at the collector, nominal speed of the overall airstream (which I think would be analogous to the carrier wave?), and if you want to get fancy, even information about turbulent flow at the bends and also at the collector. But don't worry; I'm sure that fairly soon you'll even be able to give us a full and detailed explanation of the benefits of merge collectors!

I look forward to a better understanding of said things.


BTW, Michael, what do you do for a living? I know you have a "science" degree, but what is your profession? Just curious seeing as you have a useful knowledge (at least to me its useful).

[Mercracer]

Bench racing on general theories will drive you nuts. Just the bloody knuckle factor motivates me to stick to shorties in an application where there is not a direct fit header.

Many NMRA classes require shorty headers. That means that there are some really really really fast cars running shorties. You can get at least up to a 1 3/4 shortie header. A 1 3/4 shortie header will handle all of the air that any engine will be pushing through it which you would be bolting into your car. I son't care how much extra horsepower it makes, I REFUSE to run an equal length header.

[1987cp]

I look forward to a better understanding of said things.


BTW, Michael, what do you do for a living? I know you have a "science" degree, but what is your profession? Just curious seeing as you have a useful knowledge (at least to me its useful).

Profession? Ha! I wish! The best job I've had so far was assembling pipes at a travel-trailer plant with a complete jackass for a supervisor. The working conditions sucked and the constant threats sucked worse, but otherwise I didn't have any serious complaints.

I'm actually perfectly qualified for my wife's job, but her bosses won't touch me because they hired her first.

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