Ram Air

[DukeRed]

I am mulling naked sports600 cat d/c write off project and was wondering how sports bikes with ram air run without the fairing and just the holes in the frame i.e. thundercat and loads of others.

Im guessing it might run too lean and maybe a jetting will sort it out but that is just a guess.

Thanks in advance.
____________________
Enjoy Life There's Plenty of Time to be Dead
https://www.janoner.com

[Silver]

I wouldn't have thought it would make any difference. If the RAM Air was needed for the bike to run correctly then it'd be screwed at low speeds, around town etc where there wouldn't be enough air flow.

[mchaggis]

How many sports bikes with ram air are carburetted? I thought ram air was a fairly recent thing, and that injection always achieved the right mixture. As usual, I could be wrong of course.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[DukeRed]

I would be looking at a carbed model.

Got me thinking because the thundercat has bladder style things in the front fairing between inlet and frame.
____________________
Enjoy Life There's Plenty of Time to be Dead
https://www.janoner.com

[Kickstart]

Hi

Doubt it is actually ram air. Probably just pushed cold air towards the airbox.

Ram air needs the carb float bowls to be vented to the airbox so that they are pressurised by the same amount as the inlet air. As such if the airbox isn't pressurised it should not matter too much.

All the best

Keith
____________________
Traxpics, track day and racing photographs - Bimota Forum - Bike performance / thrust graphs for choosing gearing

[dibbster]

It is an interesting question, as an owner of a 97 carbed SRAD i have never seen a naked version of it to find out. I would guess there would be some reduction in performance as you are relying on the fairing to create the low pressure area to force air into the duct. Without the fairing there is no low pressure and no rammed air, what effect this has im not sure?
____________________
Suzuki RF 600 - The two wheeled Testarossa (Deceased)
Suzuki GSXR - Now stops on a sixpence; SBK3's
www.bikepics.com/members/dibbster

[tatters]

have heard that people have tryed to streetfighter ZZR600,s (E model) and with out the ram air tubes leading to the airbox they run shit at 60mph+
____________________
Past:NRG50,AF1125(x2),NSR125RR,ZZR250,CX500,VFR400,KR1S,ZZR600(x2),CB400N,YZF1000(x2),KH125,Z200,FX400R,CBR954RR(x2)GPZ500S,GT550,VFR750F(x2),RD350N,XR650R,CBR600F,CB250,KDX250,YZF750R,CRM250,400EXC,KLR650,TTR600RE,DR350S,R100GSPD,RGV250,VMAX1200,DL650,KZ750 Present:G650XC,C12,CRF450X,1190ADV

[mchaggis]

The scoops for the ram air normally extend all the way to the outside of the fairing I think, so removing the fairing and leaving the scoops/ ducts might not make much difference to the direct airflow into the ducts.

Assuming that they put the ducts at the stagnation point (where the air comes to a halt and splits to go over and under the vehicle, normally where the radiator is situated), then removing the fairing would surely move the stagnation point? I know it's not the same as the relatively solid frontal body of a car, but the principle must be the same?

Looking at pictures of the Kwaks anyway, they seem to have the ducting for the ram air all the way to the outside of the fairing and on appearances anyway, there doesn't look to be much funnelling of the flow by the fairing. Just my . Needless to say they know far more about it than I do.

Keep the ducting and I doubt it'd make much difference. Take it away and the flow would only decrease so if anything I reckon it'd run rich.
____________________
I must not be a troll...
Mmmm, Guinness
Discovering the delights of Hammerite and a 3/4" brush.

[paulyzf600]

I was under the impression that the cat was ram air? seems alot of work to put air tubes through the frame etc just to get a little cool air to the box and it not being ram air, still it sounds great when you open it up can really hear the carbs sucking away!

Funny story about ram air, my mate sold his Blade last year to a guy who obviuosly was'nt up to scratch with the way bikes worked, anyway he phoned my mate up about a month after buying it from him and told him that he had modded the air box to match what his mates had done with his NOVA! air box (he had drilled holes in the thing!) thinking it would improve performance, why he needed more from a blade I don't know, anyway my mate proceeded to inform him he needs a new air box as it's got a ram air induction system and he would have killed the performance( apparently it felt guttless with out).
____________________
Yamaha YZF600 Thundercat

[DukeRed]

Cheers all.

I guess this means I can't just block the holes up then?
____________________
Enjoy Life There's Plenty of Time to be Dead
https://www.janoner.com

[Kickstart]