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Post subject: Cooling vs aerodynamism
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KX3  Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1383 Location: Québec |
My F2 is converted to N2. Drag resistance is already important on a naked bike. I'm wondering what would be the best choice: should I fit the plastic air guide to force the air into the rad or should I leave it to get a better C factor? Any signifiant change?
I guess that high speed driving wouldn't need air guide for cooling but I want to have the best of both world: cooling efficiency and high top speed.
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Posted: Fri May 02, 2008 6:02 am
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Billy One-handed Stoppie! Joined: 12 Oct 2007 Total posts: 2490 Location: Sweden arise! |
Road bike or a race bike? If you'll have it on the road then go for better cooling. A bit safer, it wouldn't be very nice having an engine lockup at high velocity would it!
If it is a race bike then go for aerodynamics, if you crash because of a siezed engine then you will most likely not get hurt would you? There's no steel fences or trees to smash into on a track is it?
Aint it possible to build new plastic of fibre glass? You might be able to squeze in a air guide then? 
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Posted: Fri May 02, 2008 8:58 am
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fzrman Powerband Master Joined: 14 Feb 2004 Total posts: 591 Location: Hants |
does it make that much difference? Id have thought the jacket youre wearing spoils the aerodynamics more than a small air dam?
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Posted: Fri May 02, 2008 1:08 pm
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Drewski RD/RZ Jedi Master Location: The Bunker,Cambridge, UK |
| fzrman wrote: |
| does it make that much difference? Id have thought the jacket youre wearing spoils the aerodynamics more than a small air dam? |
That's what I was going to say, you're the biggest drag factor, (I mean that in the nicest possible sense), and the fairing is/was there for you to get behind 
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Posted: Fri May 02, 2008 4:27 pm
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TygerTung Daily Burner Joined: 21 Sep 2005 Total posts: 198 Location: Christchurch, New Zealand |
You're gonna be going pretty good to get your bike hot riding it on the street.
It's pretty much impossible to ride with as much wide open throttle on the street as the track, and as a result your bike gets much hotter on the track.
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Posted: Fri May 02, 2008 10:33 pm
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jonwall05 Regular Racer Joined: 25 Jul 2005 Total posts: 454 |
and for what u gonna gain from it i wouldnt bother if flat out straight line speed u after gear it up drop 1 or 2 teeth on the back sprocket or go up 1 on the front if it will pull it
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Posted: Fri May 02, 2008 10:55 pm
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jante350RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5373 Location: Bergen, Norway |
I agree on that. My 500 misses the heat shield under the seat, and you can very much feel the heat building up under your ass just by one small 120mph trash, or just overtaking a couple of cars in one go, the engine doesnt produce much excess heat when it poodles along, but when you are on full tap its a freaking furnice down there...
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Posted: Sat May 03, 2008 10:48 am
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| xen-uno Joined: 27 Jul 2005 Total posts: 845 |
I'm surprised I can hit 120 mph relatively easy on mine (in a tuck position). I've removed all the aero body work which was pretty minimalistic in the first place. A decent car with the same power to weight ratio could hit 150 or so. It's impossible to make a bike truly aerodynamic and be able to ride the thing (comfortably). The newer street bikes have dropped frontal area a bit but have also increased the fugly factor, but I would would wager that the total CoD is only slightly better than a naked bike (like mine).
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Posted: Sat May 03, 2008 12:14 pm
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KX3Mmm, Fully Synthetic! Joined: 02 Oct 2006 Total posts: 1383 Location: Québec |
Aerodynamic is VERY important on a low-powered/low-weighted bike such as F2 because inertia is quite low too.
While in 6th gear at 160 kmh, I use my body to brake and found it very effective!
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Posted: Sat May 03, 2008 4:59 pm
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jante350RD/RZ Jedi Master Joined: 05 Aug 2003 Total posts: 5373 Location: Bergen, Norway |
I believe the F2 will struggle real hard to 120mph without the fairing.. they key in hitting hit speeds is torque.. and those old two-strokes gots surprisingly high nm or ft/lbs numbers compared to similar big bore bikes.. did you know the FJ1200 only got a measly 10nm more torque than the RD500?
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Posted: Sat May 03, 2008 8:28 pm
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