Air box cover - Wrist Twisters
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post #1 of 3 Old 10-25-2008, 07:23 AM Thread Starter
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Air box cover

I'm thinking about taking off my air box cover because I like the look. I'm afraid of the filter getting wet if I'm ever caught in the rain. Some V-twins I've seen have external air filters that can obviously get wet, does anyone know of an "all weather" air filter for the 919. Are there any other mechanical reasons I should keep the cover on the air box? Thanks for the help.

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post #2 of 3 Old 10-25-2008, 08:41 AM
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If by cover you mean that snorkle inlet thing that holds the filter in I modified mine and ran It for years with out problems. I cut the rear facing scoup off and reshaped the remaining piece with sand paper to resemble a bell mouth velocity stack. I have a K&N filter and had no water problems. I found through dynamic testing (riding around and feeling for airflow with my hand) that a low pressure area was by the modded inlet. This had to be worse with the unmodded piece trying to suck air from behind the side cover through those little holes. I thing it was and improvement but I have no good numbers to back up my statement. I have since made a ram air scoup and have found my acceration over 70mph is significantly better (seat of pants dyno). I did drop 3tenths off my 1/4 mile times but I don't think that can all be attributed to the ram air.

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post #3 of 3 Old 10-25-2008, 11:41 AM
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i think 1 prop with da ram air is that it is hard to dyno tune. fasa u go da more air you get, making it run a little leaner.dont think it would be easy to dupicate on a dyno. unless u used a air compressor and shot shop air in there.

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