Hopefuly a newish topic!! Ram Air.

[northwind]

Question is, with flow raising and lowering, how do you intend to jet? Ram air might be effective at 130mph, maybe, but it sure won't be effective at 9000rpm in 2nd, so do you want to be rich all the rest of the time or lean when it starts to work?

(brilliant, that sounds like I know what I'm talking about)

[Viney]

Seen it try and fail.

[timwilky]

Originally Posted by yorkie_chris

Well from bernoullis equation for a perfect fluid, if the intake was a stagnation point, i.e at the front of the bike where air is at the same speed as the bike then the actual pressure would only be 0.00424377bar (gauge), as you can see quite insignificant. (at 60mph)

It's all about the design of the scoop and duct, which someone I know is doing a thesis on, they're using some pretty hardcore CFD models to actually predict how these will behave.
From what I understand the main complication is actually decellerating the incoming fluid without massive frictional losses.
And remember the actual bhp gain needs to overcome the extra pressure and parasitic drag caused by the scoop, remembering that top speed with respect to power is a cube relationship (double speed = 8x power)
And that a ram air system is going to be a pain to set up as you cant reproduce 120mph airflow on a dyno.

Not as simple as it looks to get any meaningful gain, though an SRAD curvy would be cool

God you remind me of when I was doing thermodynamics and fluids so many years ago. wonderful stuff on gas analysis, looking for perfect combustion. But then we would simply say to blow or not to blow. OH sod it. pass be a blower Mr Garrett if it goes bang we simply get another engine

Originally Posted by Jester666

What do people think the possible gains would be?

Well I'd certainly buy you a pint. Does that count?

[yorkie_chris]

Originally Posted by timwilky

God you remind me of when I was doing thermodynamics and fluids so many years ago. wonderful stuff on gas analysis, looking for perfect combustion. But then we would simply say to blow or not to blow. OH sod it. pass be a blower Mr Garrett if it goes bang we simply get another engine

Muahaha supercharged curvy, now that would be worth a go!

[chris8886]

[yorkie_chris]

Originally Posted by chris8886

Always nice to see people asking well phrased and relevant questions

[chris8886]

ofc just reading that made me think of how little you really learn at school!! pretty much everything written there was complete and utter gobbeldy goock!! are there any simpler terms that it could be written in for the likes of me?

Tubes....connect intake to airbox....pressurised.....more air in air/fuel mix.....more power!

HTH!

[chris8886]

Originally Posted by Jester666

Tubes....connect intake to airbox....pressurised.....more air in air/fuel mix.....more power!

HTH!

see everyone?! someone more on my level of thinking, thats what i like although i think i could take a little more than that. especialy as from what i can understand from this is that that that concept doesn't really do very much?!