tuning admission kit

https://www.unlimited-power.net/honda/cb500/changing_admission_cb500/parts_shop/4125/1567



https://www.youtube.com/watch?v=stux1E-fuPk
https://www.youtube.com/watch?v=SAth9NvlojE

The original air intake is also still open, so the filter receives air intake from both sides.

Don’t get me wrong, this looks nice but is there only a 5hp net gain by doing this? Can’t read the graphic it’s a bit small.

If verified 5hp is a 10% gain, tuning a 500cc twin is neither cheap or easy. I have a 36% increase in power and a great increase in torque but it took a lot of development time and money. My latest engine should produce more power and torque as it has a larger capacity of 540cc with more porting work. This will also benefit from a pressurised airbox and cold air system, as I agree that the standard intake setup is not up to the job. But the side opening is not going to be a definitive solution as air passed over it at speed will still create a negative pressure which defeats the object in my opinion. 

The engine that the dyno sheet relates to managed to punch well above its weight and get pole position at Brands hatch in the hands of an accomplished rider, not me I hasten to add. It is a naked model too!

It really took the commentators by surprise, not to mention the embarrassed other riders

augmented graphical image of curves

ANDYC wrote:If verified 5hp is a 10% gain, tuning a 500cc twin is neither cheap or easy. I have a 36% increase in power and a great increase in torque but it took a lot of development time and money. My latest engine should produce more power and torque as it has a larger capacity of 540cc with more porting work. This will also benefit from a pressurised airbox and cold air system, as I agree that the standard intake setup is not up to the job. But the side opening is not going to be a definitive solution as air passed over it at speed will still create a negative pressure which defeats the object in my opinion. 

Man that’s really impressive and you must have put a lot of time and effort into this project. Wish I could just send you my engine and let you change/upgrade it haha - any idea how much it would cost to have this all done ?

Cheers man!

it could even be that the cylinders generate a slipstream behind favorable to the intake ........... like rear cylinder cooling in harley

^{Call it order, call it chaos, it´s all in the brain.   Aljihit Naskar.}

The air takes the heat with it as it passes over the cylinder and leaves it.

Moving air does not like to change directions easily, this is why the inlet ports on modern bikes are made as straight as possible to be efficient.