Ram air question?

[Pol Anorl]

soo.. newb to ram air sounds cool lol.

Is it really "so much better" than a standard air intake system?
Can it be fitted to pretty much any bike?


Is it worth it to fit?
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[jjdugen]

Bit of a marketing ploy. Almost impossible to do with carburettors without a ton of plumbing and air tight tank and float chambers. A few have tried it but its far more trouble than its worth.
On F.I. equipted engines, it might add a few bar of pressure into the inlet but to get a really good charge of air would need a scoop the size of a bus at the front of the bike. You would expend as much power pushing the the air in as you would gain from the extra pressure.
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[Teflon-Mike]

[Pete.]

[pepperami]

Hmmm? an interesting thread
What have I learnt today?
1. Forcing air into your airbox/carbs is a lot more complicated than it appears, and will require more knowledge and competence than I have
2. Well the "Ram-Air" finning/cowl on my old Suzuki GT 250 worked, as I never had it sieze or "nip up".
Maybe that was down to the fact that I always ran all of my GT`s very slightly rich?
I`d rather de-coke than do a top end rebuild, but thats just me.

3. Also if & when I finally get another project bike in the 250cc to 400cc range, putting whopping great air-scoops on the front is`nt going to help a lot
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[0ddball]

[G]

Used to be a pretty common mod on a lot of race bikes - not massively complicated to do.
But no, won't gain you a massive amount of power and was never intended to - as above, if you could get the effect of a 'chager with it at high speed we would have some really ridiculously fast superbikes flying around.

[temeluchus]

[Pol Anorl]

[Slacker24seve...]

I feel attempting to add ram air air to a BROS is a little optimistic

Though having said that, there were a few issues of Bike recently about extracting as much speed as possible, on a budget, from an old Divvy. Might be worth you reading [/b]
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[jjdugen]

I give the Daily Star version, Mike gives the Times Literary Supplement. But a good read non the less.
Carbs delight in two things:- still air and cold air. Give them that mixture and they will meter fuel and air very accurately. Start putting swirling turbulence into them and they get very upset. I can see the benifit of introducing the cooler air from the front of the engine into the airbox, but it had better be very well baffled.
I have two salient examples sitting in my garage as we 'speak'.

One is a ZZR600 'E' complete with a truly monumental ram air system. It has large twin plenum chambers fed from two ducts at the front of the fairing, leading into the airbox. Concentric with the airbox ducting are two smaller pipes leading to the carb floats, intended to equalise the float pressure. If it works at all I doubt that it made much difference. I junked it all and found I had to lean out my jetting to get good mixture (improving fuel economy by a very notcable amount). Performance is absolutely the same.
The other is a Firestorm that was fine at low speeds but ran very erratically above 60mph. There is a plastic baffle that sits above the front cylinder within the fram V at the headstock. I had left this out whilst trying to tune the carbs. Its pretty vital as without it turbulent air gets straight into the airbox and completley upsets the fuelling. Very negative results from 'ram air'.
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The CBR900RR has been sold. Aprilia Falco worms its way into my heart.
Try Soi 23 on Amazon for a good read.... Self promotion? Moi?

[Teflon-Mike]

[stevo as b4]

I remember that there was some tests done once with a ZZR1100, it might have been by JR for Performance bikes. they used a sensor to measure pressure in the airbox, and i think at the 150-160mph speeds they were seeing about 0.4-.05psi. So yes at 170mph, you could quite possibly add 5bhp to a 150bhp bike.

[Teflon-Mike]

[Pol Anorl]

Does anyone else here think that might actualy be teflon mike in his avatar?
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20:30:37 Pyro.: I don't sort of like men, I take every advantage to choke on dick.
Jewlio Iglesias: You live in Liverpool - Chances are, the front door has already been kicked off the hinges

[G]

I would have thought half a bar would give the possibility of pretty decent hp gains?

Google comes up with this.
So 1 psi gives 16hp boost when we're talking around 250hp.
So things being the same, .5 psi seems reasonable.
Half a bar seems rather a lot of pressure generally to me - we're then talking a factory turbo on various cars I believe?

[Pete.]

[Teflon-Mike]

[temeluchus]

teflon-mike:

I must admit I never managed to get lab strumpet to strip off but I did figure out how to turn esbit tablets into RDX!
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[stevo as b4]

It's a small but not insignificant amount of positive pressure that is worth having, if your going to be travelling in the 150-170mph+ region.

There are some further benefits too!
1, The small say +0.5psi of pressure can cancel out any restriction to airflow that the airbox, inlet tracts, and the filter element might have, so it's effectively like running an open carb mouth, but with a small positive pressure to feed it.

2, The other main benefit of Ram air, is that your always sucking in the coolest possible air, as the wind chill factor and the extreme distance from the exhausts, and engine heat of the intake scoops means you get the most cool dense air entering the engine, which you don't get if the airbox entry is under the set or under the fuel tank etc.

[Pete.]

All that except for the wind chill comment.
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