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[1moretoy]

Originally Posted by Dave Box

1moretoy, the amount of air passing across the filter will largely depend on the demand from the engine. Changing the type of filter will make little difference to the air/fuel ratio. If it did then K&N would soon be out of business.
As soon as things warm up here in Virginia I shall ditch the 1986 EZGO canister and install a direct K&N filter.
Dave

Dave,
this is the thread I was talking about. Seems there are split opinions on the air filter topic. Now I am not sure which side I want to go with.
http://www.buggiesgonewild.com/gas-y...r-cleaner.html

[littlecarguy]

I'm with Dave on this one. It's simple physics. Think of your air stream as a funnel. The air filter is the top of the funnel. The carb. is the bottom of the funnel. No matter how large you make the top of the funnel The flow through it will not change unless you increase the size of the opening at the bottom of the funnel as well.

[Dave Box]

I read the thread and I have to respectfully dissagree with GMB74. Littlecarguy has said it all but imagine a new clean and unrestricted air filter, now as it gets clogged with the dust that it is supposed to filter out, the air flow will be restricted and eventually the engine will run rich. However the reverse is not true. With a clean filter the engine will not run lean. It therefore matters not one jot what type of air filter you have as long as you have an effective, clean filter.
Dave

[steveb05]

Sorry guys, gotta disagree here. A carburetor ‘s function is based on pressure differential. The venturi of a carburetor is designed to create a low pressure zone (compared to atmospheric) at the location of the fuel nozzle. It does this by restricting the flow in that area. If you create a restriction ahead of that, you will change the effectiveness of that venturi and therefore the amount of fuel drawn into the air stream. There is even an effect on the ability of an intake system to absorb the fluctuations of intake pressure. This is why K&N makes so much money, the put more science into intake systems than OEM. I have some experience here, in a previous life, I built performance engines and have modified a few motorcycle engines along the way as well. I’ve known people to burn up engines after opening up the intake (nice free flowing filters) and exhaust (low backpressure) which caused the carb to run the engine too lean.

[Dave Box]

But Steve, no one is talking about opening the intake or making any changes to the carburetor. My stand is that changing the air filter will make no difference to the mixture setting. With that I rest my case
Dave

[steveb05]

Dave, I'm not disagreeing with you. What I am saying is it depends on where you started. If the OE setup had some built-in restriction that an aftermarket removes, you may lean your engine out. I totally agree that as long as you have atmospheric pressure at the carb horn, it matters not what happens ahead of it. Ok, well it kinda does 'cause of turbulence but we aren't talking about 2000 HP engines here.

Oh and none of this makes any difference on closed-loop fuel injection systems. They measure the exhaust gases and adjust the fuel delivery accordingly.

[DOOmsman]

atmospheric pressure at the carb horn, in almost
all filter apps you will not have full atmospheric pressure at the carb horn
therefor the main jet is responding to a greater differential than an open
carb.

[steveb05]

Originally Posted by DOOmsman

atmospheric pressure at the carb horn, in almost
all filter apps you will not have full atmospheric pressure at the carb horn
therefor the main jet is responding to a greater differential than an open
carb.

I almost said "near atmospheric" but decided not to.