I stand a real good chance of being 100% correct ... As is stated by many in this thread and many others like it ... this is a bunch of snake oil and there is no scientific data to support it. Been turning wrenches ( ASE Certified Master ) and racing for more years than I care to remember and this "crap" surfaces every so often. You can "theorize" all you want but it's just conjecture, plain and simple.

 

Amen...save your money for beer, wild women, and chrome.

 

What happens to that smooth flowing air right after it passes the throttle plate? It turns a corner which will induce some turbulence. Then it goes through the intake port, either polished or factory casting and slams into the intake valve. What happens to that smooth flow when is forced around a more or less flat plate and squeezed between the edge of the valve and the valve seat? Rest assured that full turbulence has been restored. If the goal is complete combustion a little turbulence should help mix up the burning and unburned mixture for more rapid and complete burning. How many racing vehicles, 2 wheeled, 4 wheeled or even reciprocating engine airplanes use these gadgets where thousands of dollars of prize money is on the line? Does NASCAR have a rule against using them as unfair competitive advantage? I doubt it. Especially in a machine with significant vibration, will the extra mass on the throttle shaft increase the rate of wear in the throttle shaft support and lead to unfiltered air leaks? At least with fuel injection a throttle shaft air leak won't throw off the mixture until the leak becomes severe.

 

I had a Boysen on my "12 RGU for 12000 mi. I keep track of fuel mileage at each fill up. I noticed no noticeable power increase and no difference in fuel mileage on my bike. On a different bike under different situations there may be some improvement but not for me. When I traded the RGU in the Boysen was still on it. I will not spend money on another.

 

Maybe all we need to do is to install a set of the Pulstar spark plugs along with the X-wing. Surely that's bound to work and give us all at least 15 more usable horsepower and torque! It says so on the Internet. Really!

 

Growing up in the north country, Boyesen was well known for making two stroke snowmobiles run a lot better. I read a review in the free mag that is given out at Harley dealers, about their X wing made for Harleys.

The most noticeable difference, a difference that I detected immediately as soon as I started the bike after installation, is that it gave me instant throttle response when "blipping" the throttle. Other than that, I detected no other difference in the "seat of the pants" dyno.

However, Boyesen also makes intakes, that were checked out in American Iron, with pretty good gains. The X wing is an integral part of their intake.

http://www.aimag.com/2014/10/hi-po-t...ower-x-intake/

 

I have used the wing on my 2011 RGU with Andrews cams, noticed that it removed the basterdising intake noise from the overlap of cams, performance was improved. Snake oil? Open for interpitation.

 

Boyesen products are legit. Anyone who calls them snake oil is mistaken.

 

When I used to run 2 stroke dirt bikes the Boyesen reed valves were very popular.

They kept pressure from backing up in the intake system. It would only flow one way, towards the engine.

Biggest difference noticed what the more instantaneous reaction to opening the throttle. Climbing a hill, at lower revs make more power than without the reeds.

This is a different system, but the theory is solid that it should make a quicker responding bike.

It was not about the additional horsepower, but the elimination of bogging when opening the throttle at lower revs.

 

you are incorrect sir. it does work. i have raced for most of my life also and at one point on a pro level. does it produce fire beathing hp? no. does it claim to do what the engineer Eyvind Boyesen says it does? yes. Dyno dosnt lie. Plus. Every product ive used by this company over the years has worked and i never for a second thought his products were snake oil. He is the inventor of the reed valve. Are you saying a reed valve is snake oil also? But hey to each his own. Drop 3 grand on a stage 2 for 10 hp. its your deal.