Clamp on air filters

[petejw1966]

with the foam uni filters i was able
to slide the rubber velocity stax from the airbox inside
the uni filter, to take advantage of the benefit of having
the v stax to me this made a small but noticable difference
i had to use plastic pvc piping at the end of the rubber stax
to prevent them from collapsing under acceleration.

[Fred]

AHHA!!!!!!!!!!!!!!

Another Penny drops

[petejw1966]

Ok Pete, now I'm with you.

The Vents as everone calls them are the hoses that go to the top of the airbox 

I always read it as that there were holes in the inlet throat of the carbs that were blocked off if you put pods over them

Well all I do is put rubber boots over the outlets to block them off and as you say the erformance loss at the low end is negligable if at all noticeable.

Nice to be on the same channel as everone else

also fred, its only those cheap 'emgo' filters that have a lip around the rubber flange
that restricts the holes in the carb bell,  k&n and uni filters dont have this lip.

[Fred]

Ok Pete, now I'm with you.

The Vents as everone calls them are the hoses that go to the top of the airbox 

I always read it as that there were holes in the inlet throat of the carbs that were blocked off if you put pods over them

Well all I do is put rubber boots over the outlets to block them off and as you say the erformance loss at the low end is negligable if at all noticeable.

Nice to be on the same channel as everone else

[petejw1966]

ive never run the k@n filters so yeah if u say that fred
im not going to argue with that,
ive only run the foam uni pod filters, so when the water does hit
it, it tends to soak into the foam, with the mesh i guess it could just
suck the water straight thru.

i also ran the keihins with uni pods, they had the vent tubes exposed,
if u do a search on u tube regarding tuning theres a few videos discussing
carb tune with vent tubes with out the air box.
i cant remember exactly, i think the air box causes a very slight vaccuum
for the vent tubes which affects the fuel in the float bowls or something like that

i just found it affected the low end a little, not enuff not to worry about not
running the pods tho, and u have to luv the sound of the induction roar when that mains kick in  :-). 

[BrettS]

Nice to hear members running pod filters with little trouble. I noticed a article on the K&N type filters and the test the ran showed no performance gains except on highly modified engines and they where much less efficient at handling the dirt dust. I think I will stick with the foam filters in the future.

[Fred]

I've heard that from a few people Pete that rain won't effect them but my own experience says otherwise.

I don't have any foam in my pods just fine and then very fine stainless wire mesh and I went chasing HT leads and Coils for ages to explain cylinder shutdowns in a downpour.

Stop the bike and let it dry out for a while or just get out of the wet and run it on the two or three pots still going for a few minutes and away you go again on all four.

I run the early model carbs on my '78E and I've never understood what they're talking about when they mention either the "Vent Holes" or "Vent Tubes" as you now put it on the intake side of the carbs. I just know that they work very well in the dry and sound awesome when I wring its neck.

I don't run them now in the wet and I've now got no issues with cylinder shutdown no matter how hard it rains.

[petejw1966]

hey fred,
ive ridden in many a downpour and the water never affected
the filters, the only time is when washing the bike then all u need to
do with the foam ones is give em a bit of a squeeze, and any amount of
water left wont cause any troubles at all.

                              -                -                    -

the carbs best suited for pods are the later 81 model where there
is no vent tubes coming out of the top of the carbs, the 81 carbs have
the vents at the back of the carb bell, u can still use pods on the early model
carbs but they wont run as well.

[Fred]

don't run the pods on rainy days, they don't like breathing in H2O.

I've got a set that I use on sunny days for bike shows and such just to customize the look a little more. It's only about a 20 minute job to change over once you do it a few times.

Even though I run a 4 - 1 system on my 1179 Wisco Kit I've never had to change the jetting from standard. Keep it well tuned and the performance you get from the motor will be more than adequate for the capabilities of the rest of the bike.

If your bike is a daily commute and you don't have an alternative but to ride it stay with the air box.

This setup is tried and proven with several million dollars of research and developement spent on it.

[petejw1966]

i ran that set up for years without any problems
just bump up ur mains from 110 to 115 to be
on the safe side, other than that there should be nothing
else to do.

[Lumberjack]

Hey, just on a similar idea, I was wondering what impact a 4 into 1 exhaust and pod filters might have.  I don't have an oil cooler on the front, so there shouldn't be too many dramas fitting the exhaust.  Obviously I'd need to get someone to do the rejetting.

I've done as much research as I can and people on other threads and similar sites have suggested that there is really only benefit when you do both pods and exhaust.  What are other people's thoughts?  Would it be worth it? Are there any other considerations to take into account?

[petejw1966]

if u do decide to go with pods,
dont go with those very cheap ones, they have a lip
around them that cause restrictions to the holes in the back of the carb bell,
u can also get unifilters that are cheaper than k@n filters,
if u run the 81 carbs u wont have any problems with pods, just bump
the mains up by 2 sizes and u should be sweet.

[Jonesy]

Short answer. ditch the tap and retain the air box, These things dont run as well with pod filters without some rejetting and tweaking

[tykwy]

With one of my fuel taps mounted goofy on the tank it's sitting on the air intake manifold, which got me thinking (when I saw an XS on Ebay with them) of removing the whole intake box and using clamp on filters like:

These ones

Or better yet

These Ones

Has anyone had any experience with them?