goodall
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| posted on 7/3/07 at 04:33 PM |
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Ram air effect??
does it give any more power?
if so how much?
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Bob C
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| posted on 7/3/07 at 04:35 PM |
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1) yes
2) about a watt!
Bob
edited to be less tongue in cheek -
power gains due to RAM effect are marginal/zero - much more gain from getting cold air in there. Superbikes up at 180 - 200mph might start to pickup a
percent or 2 (they have teams of specialist aerodynamicists to help...)
[Edited on 7/3/07 by Bob C]
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Rob Palin
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| posted on 7/3/07 at 04:40 PM |
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I remember calculating once that 160mph was roughly the equivalent of a 10 degree reduction in intake air temperature. The increase in pressure at a
more car-relevant 100mph is about 1200Pa, which is only 1% increase over the standard atmospheric.
You're better off just making sure you get a supply of cool, fresh air to the intake than worrying about ram effect.
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Hellfire
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| posted on 7/3/07 at 04:41 PM |
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IIRC Ramair is only beneficial at speeds greater than 180mph. Therefore, no you are not going to benefit in your BEC.
Steve
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Confused but excited.
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| posted on 7/3/07 at 04:56 PM |
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Unless you ram it in with a supercharger! 
Tell them about the bent treacle edges!
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goodall
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| posted on 7/3/07 at 08:24 PM |
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ah so a bonnet scoop doesnt give any positive effect besides looks a wee bit nice but it increases drag ie haveing an adverse effect,
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smart51
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| posted on 7/3/07 at 09:02 PM |
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yamaha quote 180 BHP for their 2007 R1 or 189 with ram air. That's a 5% increase. It has a top speed of 178 MPH and you might have to get
quite close to this to get the extra power.
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Rob Palin
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| posted on 8/3/07 at 09:22 AM |
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quote:
Originally posted by goodall
ah so a bonnet scoop doesnt give any positive effect besides looks a wee bit nice but it increases drag ie haveing an adverse effect,
Yes and no. As a source of low turbulence, ambient temperature air, yes. As a ram effect device, no.
The drag penalty has another adverse consequence in that it adds a nose-up pitching moment which will further increase the already mighty front end
lift on a 7-alike. Taking in engine and cooling air from as low down as possible is the better aerodynamic route, but then it's harder to
ensure it's cool air as you route ducts or whatever around the engine.
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