Thanks guys for your input but I am still not quite sure on the risk/reward ratio but the velocity stacks certainly add a unique look to the intake side of the motor.
Here is the link to the ebay item that got me started on this inquiry.
cgi.ebay.com/ebaymotors/VELOCITY-STACK-K...QQrdZ1QQcmdZViewItem
I understand the ram air/supercharged or turbo effect of increasing the velocity and volume of air into the carb. My very first car was a 1970 Chevelle SS big block with the factory Cowl Induction hood. Under hard acceleration vacuum from a carb line opened a solenoid which activated a flap on the back or cowl side of the hood. There was a rubber, cold air gasket that sealed the air breather assembly to the underside of the hood.
The belief was that the cooler air from outside of the hood was better for making power than the hot air from under the engine compartment. If I/m not mistaken, the cowl inducted air bypassed the air filter thanks to the bulge in the hood which funneled the outside air down and over the carb intake area. My point in referring to this hood style that GM had designed this system knowing that some air was bypassing the filter. (This set-up wasn't ideal for hammering it down old dirt roads while following another car kicking up dust!)
Now, the velocity stacks I am considering have a mesh filter to avoid sucking in small cats or Kleenex tissue fragments from my sniffling Honda 750 Interceptor friends I plan on beating
and while the primitive filtration of the velocity stacks are not up to snuff compared to the modern oiled media type filters, they will at least offer some degree of large particle protection.
My main concern is plugging up the carb circuits or jets with tiny dirt particles which would likely end up in the float bowl bases before making their way into the heads. Maybe I am wrong on this point.
As I mentioned in the initial posting, the bike is to be used for short adrenaline rushes, city roads only when there is not chance of rain.
Any other input or comments would be appreciated.
Cheers-Colin Firth
'77 Kz 650 with 700 Wiseco kit, ported heads, MAC Pipe, Pods, 14 tooth sprocket. 14K miles, totally rebuilt from frame up. Moving forward with 750 jugs, 750 cams and 810 Kit with 34Mikunis