• Required reading for all forum users!!!

    Welcome!
    Register to access the full functionality of the GSResources forum. Until you register and activate your account you will not have full forum access, nor will you be able to post or reply to messages.

    A note to new registrants...
    All new forum registrations must be activated via email before you have full access to the forum.

    A Special Note about Email accounts!
    DO NOT SIGN UP USING hotmail, outlook, gmx, sbcglobal, att, bellsouth or email.com. They delete our forum signup emails.

    A note to old forum members...
    I receive numerous requests from people who can no longer log in because their accounts were deleted. As mentioned in the forum FAQ, user accounts are deleted if you haven't logged in for the past 6 months. If you can't log in, then create a new forum account. If you don't get an error message, then check your email account for an activation message. If you get a message stating that the email address is already in use, then your account still exists so follow the instructions in the forum FAQ for resetting your password.

    Have you forgotten your password or have a new email address? Then read the forum FAQ for details on how to reset it.

    Any email requests for "can't log in anymore" problems or "lost my password" problems will be deleted. Read the forum FAQ and follow the instructions there - that's what we have one for...

  • Returning Visitors

    If you are a returning visitor who never received your confirmation email, then odds are your email provider is blockinig emails from our server. The only thing that can be done to get around this is you will have to try creating another forum account using an email address from another domain.

    If you are a returning visitor to the forum and can't log in using your old forum name and password but used to be able to then chances are your account is deleted. Purges of the databases are done regularly. You will have to create a new forum account and you should be all set.

Views of these pod filters? ****e?

  • Thread starter Thread starter Sexysuzi
  • Start date Start date
They're rubbish.

Are you in the UK by the way? Fill out your location and pop your bike in your signature - people will find it easier to help that way.
 
Last edited:
I just dont get it. How can they not filter and not have air flow?I have K&N's on my 850 right now cause they look neato and I got a dang good deal on em. Had the cheap emgo's on it at one point. I can not tell a difference in the way the bike runs with with either ones. I'm just saying..
 
Octain said:
I just dont get it. How can they not filter and not have air flow?I have K&N's on my 850 right now cause they look neato and I got a dang good deal on em. Had the cheap emgo's on it at one point. I can not tell a difference in the way the bike runs with with either ones. I'm just saying..
Click to expand...

Cut a cheapo pod in half - there's no bellmouth in there.
 
Octain said:
Ok, got that but how can a filter not filter air and not flow air at the same time?

If it's not filtering then it must flow better, correct?
Click to expand...

No. I don't pretend to understand it - the maths is way beyond my 2 plus 2 - but it's all to do with resonance, pressures and what happens when inlet vapour hits a closed valve.

All way to complicated.

And that's the point. All the major bike manufacturers employ very clever people with post-doctorates in maths to work all the equations out and design the optimum airbox. And yet thousands of guys working from a shed think they can do better.
 
Octain said:
Ok, got that but how can a filter not filter air and not flow air at the same time?

If it's not filtering then it must flow better, correct?
Click to expand...
No.

IF you look at the inside of one of them, they choke down. This can cause turbulence at the intake manifold, retarding air flow. As far as filtering anything, they'll filter about as well as your screen door.
 
TheCafeKid said:
No.

IF you look at the inside of one of them, they choke down. This can cause turbulence at the intake manifold, retarding air flow. As far as filtering anything, they'll filter about as well as your screen door.
Click to expand...

Now I get it!So no filter at all wont filter anything but would only stand to reason to flow better. This is kinda what I was thinkin.
 
They filter about as well as a sifter for flour, it's just a wire mesh. If you fill one with sand and shake it, the sand gets through. As for the airflow they are poorly shaped, just rough edges, square corners. Aerodynamics is very weird science, but basically air likes smooth round corners to go around.
K&Ns have sort of a velocity stack formed inside, and smooth round edges everywhere.
I have several sets of these Emgos that were on different bikes I bought, I keep them to use on non running bikes to keep bugs and leaves out of the carburetors. For that they are fine.
 
Hi,

I like my airbox. ;)


Thank you for your indulgence,

BassCliff
 
It's the "vena contracta" effect. Here's a google image search from here that depicts it in duct intake design. F_d is the "hood entry loss coefficient." How much that effects the flow is too much thought for me right now, but the important thing to see is less loss as you move down the chart;)

fig03.gif


Now as to the cheap pods themselves. I think they're fine for what they are if you get them at the 4 for ~ $35 price. Great if you're on a tight budget and just want to filter out the leaves and bugs on a cheap flogging bike. I ran them unoiled... I think that's where some people have a hard time with weird behavior from these pods when they try to oil them like K&N's. If you want the best thing for your engine's longevity, avoid pods all together.

Even with the 90 degree edge(like Figure 3 (b)), they flow better than the stock bell-mouths sans the airbox on the older 750's with VM carbs. I had to go out to the garage and measure the difference actually:

I.D. of tightest point on cheap pods: ~39mm
I.D. of '79 750's air box bell-mouths: ~33mm
I.D. of the carb mouth: ~40mm, then it necks down at the slide.
 
Last edited:
Something else to think about too. The full foam uni's(without the chrome end cap) flow really well and are decently priced.
 
verde said:
Something else to think about too. The full foam uni's(without the chrome end cap) flow really well and are decently priced.
Click to expand...

That is true.

As to the Emgos. If you're looking just to tart it up, do something worth while and slap some bell-mouths on it, strap some panty hose to em for filters and call it a day ;)
 
Octain said:
Now I get it!So no filter at all wont filter anything but would only stand to reason to flow better. This is kinda what I was thinkin.
Click to expand...

Jetted correctly for open intake, your carbs will work just as well if not better with NO filter. KNs or their ApE counterparts just keep us knucklehead speed merchants from sand blasting our cylinder walls :D
 
TheCafeKid said:
As to the Emgos. If you're looking just to tart it up, do something worth while and slap some bell-mouths on it, strap some panty hose to em for filters and call it a day ;)
Click to expand...

Haha, yeah. Got to agree with that. Here's the sheet of universal filter foam cut and zip tied to bare carbs option that replaced my emgos:p Been thinking I'll make some bell-mouths when I get some excess tinker time(after a dozen other projects get finished first).

6044637019_50c79afae3-1.jpg


TheCafeKid said:
Jetted correctly for open intake, your carbs will work just as well if not better with NO filter. KNs or their ApE counterparts just keep us knucklehead speed merchants from sand blasting our cylinder walls :D
Click to expand...

It should be pointed out that some CV carbs behave like crap with turbulent air. Just want to spare someone from driving themselves batty trying to jet a bad situation;)
 
Last edited:
I'm a Technology Teacher and MY head hurts from this thread lol.
 
verde said:
Haha, yeah. Got to agree with that. Here's the sheet of universal filter foam cut and zip tied to bare carbs option that replaced my emgos:p Been thinking I'll make some bell-mouths when I get some excess tinker time(after a dozen other projects get finished first).

6044637019_50c79afae3-1.jpg




It should be pointed out that some CV carbs behave like crap with turbulent air. Just want to spare someone from driving themselves batty trying to jet a bad situation;)
Click to expand...
Well, if ya make up a set of bell mouths for VMs, I'll be interested in purchasing a set ;)

And as far as the last bit, I'll have to disagree with ya on that from my own experiences but won't say you're wrong as even with filters a nasty cross wind has made mine stumble a time or two.
 
You must log in or register to reply here.
Back
Top