Stock airbox with 29 smoothbores yes /no

[GregZ]

Anyone ever run the stock airbox with smoothbores?? I am not happy with the Emgo or K&N pod filters,plus the side covers do not fit properly. I think the carbs would need low jets maybe 15 pilots and 117.5 mains. Appriecate your advice
Cheers
Gregz

[Padders]

Hi Greg,

I have just bought a full standard airbox for my Z1000A2 which is fitted with 29mm smoothbores. At the moment it has individual air filters which I am not too happy about. I will be taking the bike to the local dyno guy for a full session to sort out the jetting and can let you know the outcome. It will be a couple of weeks though as the airbox is coming from the USA.

padders

[GregZ]

Hi Padders

Please keep me posted with your results. I am going to try the 15 and 117.5 and see whats happens. We still have a few weeks of cold weather only 40 degrees today so I have time to experiment with the jetting.
Cheers
gregz

[RALPHARAMA]

That's about 4-5?C

In the UK we talk about cold weather in Celcius and Hot weather in Farenheight.

Prolly about that here in Zomerzet - Took my beloved Zed up the Chinese in town tonight - only 'bout six or seven miles so not enough for the cold to penetrate the leathers but the blast through the vents in my lid was a tad bracing! Awesome feeling

[ollie]

greg ,i used to run one of my 73 z1's on 29smoothies with std airbox ,she was way better than single filters ,plus ive a feeling that the carbs didn't need as much synching as the singles
ollie

[Rich]

15 or 17.5 pilots, you may find that you need smaller mains than std as sbores flow better depends on the exh.

[debben1]

Hello GregZ, The airbox is a good idea, I grafted the stock airbox onto my Z1325cc which has RFS38 Mikuni carburretors and although no improvement was seen on the dyno quarted mile times improved by a small amount over individual air filters. Regards, Steve

[Jeff Saunders]

The airbox will give far better air quality to the bike at all speeds. The problem on the dyno is it doesn't show you the effects of turbulence around the back of the engine at different speeds.

With velocity stacks on a bike, you can impact the way the bike runs just by moving your legs in and out to deflect air differently.

[debben1]

I agree, You only have to look at bikes without an airbox and you can see fuel stains behind the carburretors where the turbulant air has drawn mixture backwards out of the venturis, with an airbox all the air is going forward and not affect by the air your bike is pushing through. I mentioned the dyno testing to address any doubts regarding air intake being restricted by using an airbox over velocity stacks or individual filters, although we have seen loss of power when cheaper individaul foam filter have been fitted. The larger airducts for the flatslide carbs works just like a velocity stack but into a big volume of still air. If you look at nearly all of the pro stock bikes now (where they can not rely on turbo or nitrous for additional power gains) you wil see that the one piece body work is sealed to create a huge airbox, this provides a large quantity of still air. Regards, Steve