Fuel mist in airbox intake area

ninjawarrior1244

Location:

Daytona Beach, Fl

Joined: 03/27/11

Posts: 262

Fuel mist in airbox intake area
05/26/12 6:56 AM

Opened up airbox to remove flies and have a light mist of fuel surrounding the butterfly intakes. 1200 miles on bike now. Any reason for this spray, anyone else have this issue when getting ready to pull your flies?

Cause....Cure?

Ninja

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Rook

Joined: 03/28/09

Posts: 20592

RE: Fuel mist in airbox intake area
05/28/12 8:13 AM

Any reason for this spray,

Here's a guess. Your injectors are under under the primaries. If the the secondaries job is to cut flow under heavy throttle at low rpm, stands to reason that there would be fuel misting up onto the secondaries. The restricted air flow is not allowing the fuel spray to be sucked into the intakes as effectively so it fogs up and out around the ducts in the airbox?

anyone else have this issue when getting ready to pull your flies?

I found a a coat of oil under my fly plates on my 08. Have been in there several times since the fly pull and there is always some kind of slight oil residue on the primaries.

Are you sure this is fuel you have? Seems as though that would evaporate pretty quickly and be gone before you got the tank and covers off.

If you are sure this fuel and not an oil mist, how much fuel are we talking?

'08 MIDNIGHT SAPPHIRE BLUE Now Deceased

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ninjawarrior1244

Location:

Daytona Beach, Fl

Joined: 03/27/11

Posts: 262

RE: Fuel mist in airbox intake area
05/28/12 8:50 AM

No it is fuel, not oil....used a white rag to wipe and test for oil...not present.

Now that the flies are out, hoping less pressure in the intake area will reduce or eliminate any more fuel mist/droplets around the intake area.

Seems to me with 1200 miles the bike the rings have seated now, there should be NO oil shooting past the rings into the intake plenum areas.

Any more ideas or thoughts?

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Hub

Joined: 02/05/09

Posts: 13719

RE: Fuel mist in airbox intake area
05/28/12 6:26 PM

Maybe this will explain for ever action of fuel in, there might be a push out. Physicsir, watch the physics. Nothing will help actually.

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Hub

Joined: 02/05/09

Posts: 13719

RE: Fuel mist in airbox intake area
05/28/12 6:27 PM

* Last updated by: Hub on 5/28/2012 @ 6:27 PM *

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hagrid

Location: pittsburgh

Joined: 02/16/12

Posts: 2210

RE: Fuel mist in airbox intake area
05/28/12 8:18 PM

Amazing. In the zoomed out view you can see wisps of atomized fuel escape the engine entirely. At WOT to boot.

Excellent find Hub.

Oh... almost forgot. Ford may have solved this. Their Eco-Boost engines use direct injection. If i understand correctly
the fuel injector sprays into the combustion chamber directly... as is done in Diesel engines. I suppose this exposes the injector
nozzle to combustion temperatures. Longevity?

I also read a research paper that explained the successful employment of lasers as a substitute for spark plugs. The advantages?
The lasers caused ignition of the air/fuel mixture much more quickly. The difference is messured in micro-seconds... but at
18,000 rpm they add up.

* Last updated by: hagrid on 5/28/2012 @ 8:33 PM *

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Rook

Joined: 03/28/09

Posts: 20592

RE: Fuel mist in airbox intake area
05/29/12 7:03 AM

Yeah, that is a great vid Hub. That is almost like what I was envisioning ....not that severe but fuel mist has got to waft all over being sprayed in such a small bore. I'm sure that is why they changed the spray angle on the 08-11, to get as much fuel as possible into the new combustion chamber.

'08 MIDNIGHT SAPPHIRE BLUE Now Deceased

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bigwilliezx

Location: Keller, Texas

Joined: 04/29/11

Posts: 571

RE: Fuel mist in airbox intake area
05/30/12 3:56 AM

Cool vid!

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