Air to the Airbox

RQ · Post by RQ » Thu Nov 04, 2004 4:27 pm

Ok, here's a thought........ what if there was a way to route a flat (ish) tube directly from the snorkel on the airbox to the fairing just under the headlight, kind of like the big Kwacker has (or had) it.
Would it make any difference to the upper end speeds, or would it just screw it all up

Pete.L · Post by **Pete.L** » Thu Nov 04, 2004 4:34 pm

Sorry RQ
It would screw it up Royaly.
you would probably need a flow controller valve tied into electronic fuel injection and a sh1t load of time in a wind tunnel to make it work.

Keep thinking though

a good un will come alone eventually

Pete.l

iggy1966 · Post by **iggy1966** » Thu Nov 04, 2004 4:37 pm

I theory it should act like the old "ram air" system that has been used a few times on bikes and give better performance, as your speed increases the air pressure increases there fore it should work in a similar vien as a supercharger ( although not as pronounced).

Ian

RQ · Post by RQ » Thu Nov 04, 2004 4:47 pm

Mmmm, Iggy hit it on the head there, that's what I was thinking of (In theory!!) If the air pressure going in increases, then the voulme of air being forced into the cylinder should increase too. That in turn increases the amount of oxygen in the burn cycle, giving it an extra thump.

Pete has a good point though. If you left the mix as standard as for the "un - rammed" air, would it need adjustment for the mix at the higher speed to avoid lean / rich issues?

Stormin Ben · Post by **Stormin Ben** » Fri Nov 05, 2004 1:30 am

I seem to recall that bikes with ram air systems have a pipe connecting the airbox to the float chambers in the carbs.
The idea being that the increased air pressure in the airbox pressurises the cars so they feed more fuel -or sommat like that.

Best person to ask is Roger at Revolution racing. He ran a couple of VTR's in BSB a few years back. They had full Moriwaki ram air systems

Ben

Johnny Wishbone · Post by **Johnny Wishbone** » Fri Nov 05, 2004 7:32 am

Yeah Ben, that's the idea alright. You can't just start forcing in extra air into the cylinders and hope for the best - the fuel/air mixture would need to be kept at roughly the same ratio, or improved to it's optimum value meaning all sorts of gadgets & jiggery pokery to measure air/fuel ratios

The jets would have to be increased in size to handle the extra fuel flow etc etc etc... not as simple as gluing a hollowed out megaphone onto the front of the bike then.

Max · Post by **Max** » Fri Nov 05, 2004 8:44 am

Confession time.....

Many years ago when I was but a child me and my mate Simon converted my X7 ( 250 2 stroke for those of a younger disposition ) to Ram air. 2 lengths of 4" drian pipe were taped to the tank and an old inner tube and jubilee clips connected it to the carbs. It worked to a degree at low speeds the inner tube would not open up and the bike would run horribly rich then as the speed increased the inner tubes would open up untill the bike ran so weak it would over heat. It did eventually blow up in a very big way a little while later after the pipe work was removed.
On another note on the old NC30 web site a guy from Holland I think, did a lot of work to try and get his NC to work with the front of the air box ducted. I think he had to change the carbs as the std ones werent suitable for some reason to do with the air box being presurised.

RQ · Post by RQ » Fri Nov 05, 2004 10:07 am

Blew up?!?!? Fu(k, I'll leave that idea on the back burner so. Off to the drawing board again........

EggShellBlond · Post by **EggShellBlond** » Fri Nov 05, 2004 12:52 pm

Stormin Ben wrote: Best person to ask is Roger at Revolution racing. He ran a couple of VTR's in BSB a few years back. They had full Moriwaki ram air systems

Ben

B E A U tiful

robin1000 · Post by **robin1000** » Fri Nov 05, 2004 7:25 pm

If I'm not mistaken that's the bike that Gus Scott rode in BSB as a guest rider. He was very impressed with it!
I had my engine rebuilt at Revolution in July (It'll be for sale very soon, more later) and spoke at length about the bike. The ram air was a special part from Moriwaki, as was most of the bike. The "ram air" took continual reworking and depended entirely on the modified (Moriwaki) air box.
I asked about putting it onto mine and Roger said that a huge amount of work would have to be done to the air box and carbs.
Theory dictates that more air means more fuel means more power, but can also mean overfuelling, running lean and maybe a popped engine!

My engine. Rebuilt by Roger. 2 meetings since rebuild. Comes with the carbs and airbox. I have a dyno sheet for 108bhp, and a receipt showing Â£2k. If you want it it's Â£500, that's half the cost of the parts that went into it. This is a genuine engine and an absolute bargain. You'd pay more than this for an unknown engine from a breakers without the anciliary equipment.
PM if yer interested.