Exhaust Science

[mully95]

Ran across this in another forum:

Auto Exhaust Science

I have not read it all word for word but will. Talks on automotive engines rather than motorcycle engines but both do relate to one another.

I like the part found in "Header Primary Pipe Diameters"

" In practice though it is better, especially for a street-driven machine, to have pipes a little too small rather than a little too big. If the pipes are too large a fair chunk of torque can be lost without actually gaining much in the way of top-end power."

Now to me my bike doesn't have aftermarket cams, head work, pistons... so I don't think I need a 2" primary piped header. So my Viking exhaust 1 5/8" header should work perfect for my engine. Another words if I installed a 2" header on my bike I will most likely be upset... and my leg would be on fire...lol

 

[IMFASTTOO]

Ran across this in another forum:

Auto Exhaust Science

I have not read it all word for word but will. Talks on automotive engines rather than motorcycle engines but both do relate to one another.

I like the part found in "Header Primary Pipe Diameters"

" In practice though it is better, especially for a street-driven machine, to have pipes a little too small rather than a little too big. If the pipes are too large a fair chunk of torque can be lost without actually gaining much in the way of top-end power."

Now to me my bike doesn't have aftermarket cams, head work, pistons... so I don't think I need a 2" primary piped header. So my Viking exhaust 1 5/8" header should work perfect for my engine. Another words if I installed a 2" header on my bike I will most likely be upset... and my leg would be on fire...lol

NO you would make more HP as the 2 inch pipes have been designed using a DYNO to make max HP

 

[Paul Bryant]

Ran across this in another forum:

Auto Exhaust Science

I have not read it all word for word but will. Talks on automotive engines rather than motorcycle engines but both do relate to one another.

I like the part found in "Header Primary Pipe Diameters"

" In practice though it is better, especially for a street-driven machine, to have pipes a little too small rather than a little too big. If the pipes are too large a fair chunk of torque can be lost without actually gaining much in the way of top-end power."

Now to me my bike doesn't have aftermarket cams, head work, pistons... so I don't think I need a 2" primary piped header. So my Viking exhaust 1 5/8" header should work perfect for my engine. Another words if I installed a 2" header on my bike I will most likely be upset... and my leg would be on fire...lol

This is exactly why I build these pipes as I do Mully.
Sure other systems may make more outright HP, but at what RPM ? 9K, how often would you use it, on a street bike.
I've been riding Big Bikes all my life, usually fast (it's no small miracle that I am still alive!) I've had all sorts of pretty good Engines.
I like the way my Bike runs, with this same header but with two mufflers.

 

[Paul Bryant]

NO you would make more HP as the 2 inch pipes have been designed using a DYNO to make max HP

This is correct Art, but do you use MAX HP at cruising speeds ?

 

[warp9.9]

 

[mully95]

This is correct Art, but do you use MAX HP at cruising speeds ?

Exactly what I was trying to say but in better form of words.

The guy that wrote the article is by David Vizard (Ex-aerospace engineer David Vizard is one of the world's most widely published automotive writers)

In which I don't who he is but being a ex aerospace engineer ... should hold some knowledge.

 

[Idaho Red Rocket 3]

As long as David Vizard is NOT the guy who said it was OK to fly the Challenger on that freezing morning in January.

 

[IMFASTTOO]

This is correct Art, but do you use MAX HP at cruising speeds ?

AT Cruising speeds the stock exhaust works fine .

 

[Joesmoe]

@mully95 didn't, but that's why I purchased a Touring. Even so, I'm expectantly waiting on @Paul Bryant 's completion of my exhaust system, for that "Goldilocks" performance on my bike.

 

[Paul Bryant]

AT Cruising speeds the stock exhaust works fine .

Indeed it does, but it sounds like, .......... well I was going say shiet, but truth is it doesn't sound much at all. Which does suit many people.