1992 suzuki intruder 1400 air filter mod - Motorcycle Forum
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post #1 of 16 (permalink) Old 04-24-2017, 05:16 PM Thread Starter
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1992 suzuki intruder 1400 air filter mod

I want to fabricate cold air intakes for my bike, but it has 2 carburetors. the only way I can see this happening is fabricate two aluminum pipes to fit from each carburetor to the right of the bike looking at it from the back. my question is, would this be possible? also, should I face the filters to the front of the bike, downward, or to the rear of the bike? plus, what would I do to tune it after this happens?


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post #2 of 16 (permalink) Old 04-24-2017, 05:36 PM
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Originally Posted by DavidSkinner View Post
I want to fabricate cold air intakes for my bike, but it has 2 carburetors. the only way I can see this happening is fabricate two aluminum pipes to fit from each carburetor to the right of the bike looking at it from the back. my question is, would this be possible?
Depends on whether you're good at fabricating or not.

The biggest issues I can see would be to make sure they have adequate support, so they don't vibrate and start to crack, or worse crack your carburetor intake horns. I don't know how much room you have to work with on that bike, but that's a concern too, of course. You want to use as few turns as possible as bends tend to restrict air flow.

It doesn't much matter which way you point the air filters, other than pointing them backwards. Lots of after-market units point forward for a custom, aggressive look, but in reality it doesn't much matter if they face forwards, upwards, out or whatever.

Yes, you may have to re-tune your carburetors, but if you're using the same air filter elements probably not. I would put a fresh set of plugs in after the modifications and see how they read. Probably won't be much of a change, assuming your bike is correctly tuned now.
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post #3 of 16 (permalink) Old 04-24-2017, 05:39 PM Thread Starter
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so from what i'm getting from what you replied with, the modification is basically useless?


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post #4 of 16 (permalink) Old 04-24-2017, 05:41 PM Thread Starter
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or just an idea, get two smaller custom air filters for direct application straight from the carbs and have plastic housings that pull air from the outside to around the filters.


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post #5 of 16 (permalink) Old 04-24-2017, 11:01 PM
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so from what i'm getting from what you replied with, the modification is basically useless?
Not entirely, as it might look really custom and cool. It might also give you a chance to show off your fabrication skills, as well as have some fun modifying your bike and making it your own.

But for performance, it will do nothing for you, and may even be a slight bit detrimental.

If you want to get more "Oomph" the best way is to start with a free flowing air cleaner, a performance exhaust, and a re-tune to make them both work well together. That might get you a few more ponies in your barn.

After that, you might want to think about replacing your cams. But unless you also do some head work that will not give you much real advantage. And about that time it would be good to start planning on increasing your compression too, if you want to take advantage of those new cams. You can spend a lot of money chasing a few extra ponies, and I've seen a lot of fellows wast quite a bit on unrealistic expectations. (I'm one of them. )
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post #6 of 16 (permalink) Old 04-25-2017, 12:02 AM
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The stock air boxes on the 1400 are somewhat restrictive. Many have 'uncorked' the 1400 and, if done properly, you can gain a noticeable amount of performance. Usually it is done by just removing the air boxes and installing pod filters; the properly part involves the re-jet. The engine, like many, is lean from the factory, and increasing air flow requires increasing fuel. Just replacing the main jets isn't enough; the jet needle/needle jet has to be addressed to make sure the mixture is good across the rpm range, and the pilot jet sometimes needs changing, too. It really helps to get it right if you know someone with a dyno that has an exhaust monitor. A fancy-looking CAI system looks cool, but helps little over the pod filters, and, given how little room you have, is a lot of work. I've seen photos of Intruders done this way, though.

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post #7 of 16 (permalink) Old 04-25-2017, 11:55 AM Thread Starter
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Quote:
Originally Posted by WintrSol View Post
The stock air boxes on the 1400 are somewhat restrictive. Many have 'uncorked' the 1400 and, if done properly, you can gain a noticeable amount of performance. Usually it is done by just removing the air boxes and installing pod filters; the properly part involves the re-jet. The engine, like many, is lean from the factory, and increasing air flow requires increasing fuel. Just replacing the main jets isn't enough; the jet needle/needle jet has to be addressed to make sure the mixture is good across the rpm range, and the pilot jet sometimes needs changing, too. It really helps to get it right if you know someone with a dyno that has an exhaust monitor. A fancy-looking CAI system looks cool, but helps little over the pod filters, and, given how little room you have, is a lot of work. I've seen photos of Intruders done this way, though.
what are pod filters? you mean the cold air intake filters but smaller?


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post #8 of 16 (permalink) Old 04-25-2017, 01:30 PM
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Pod filters fit directly on the carbs airhorn.


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post #9 of 16 (permalink) Old 04-25-2017, 05:28 PM Thread Starter
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how would I figure what size I need for my engine/carbs?


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post #10 of 16 (permalink) Old 04-25-2017, 07:58 PM
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Some have used K&N RU-1820’s for front and rear., others K&N F021B4.

Rick
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post #11 of 16 (permalink) Old 04-25-2017, 10:43 PM
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Quote:
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Pod filters fit directly on the carbs airhorn.
Years ago I thought a "pod filter" was some special sort of performance air filter of a secret design that was specifically made for certain types of metric bikes. If you installed one of these secret weapons you would gain significant horsepower increases in the range of 10, maybe even 20% range. The name, "pod," must mean it has some sort of specially designed air box that increased in-flow.

Eventually I realized that a pod filter is just another name for a clamp on, free-flowing, naked air filter.

(And as with the ones for Hogs, the ones that are well designed and well made increase air flow. The cheap crappy poorly made ones often decrease air flow.)
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post #12 of 16 (permalink) Old 04-25-2017, 10:44 PM
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Some have used K&N RU-1820’s for front and rear., others K&N F021B4.
K&N makes good stuff.
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post #13 of 16 (permalink) Old 04-26-2017, 12:54 AM
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I'm thinking space to make mod's for the front air filter under the fuel tank could be a problem.

Have you thought about cutting the top out of the stock air box?
The air inlet on that stock air box is very restrictive. You could cut the side out of the rear air box for the same effect.
You can get a huge gain in airflow with that simple mod.

Just keep in mind if you do it, you'll likely need to go up somewhere around 5~7 main jet sizes. (Maybe More)?
You'll also need adjustable jet needles. The stock air box is that restrictive!

FWIW, That bike will be quite a chore to make such a mod to because of all the cables connecting the front and rear carburetors.
It ain't like you can put the parts in and hit it right the first try.
You'll be in and out, dealing with those cables and setting the high and low speed sync every time you make adjustments.

IMHO If you've never done performance tuning before this ain't the right bike to learn on.
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post #14 of 16 (permalink) Old 04-26-2017, 06:30 AM
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Quote:
Originally Posted by Eye_m_no_angel View Post
Years ago I thought a "pod filter" was some special sort of performance air filter of a secret design that was specifically made for certain types of metric bikes. If you installed one of these secret weapons you would gain significant horsepower increases in the range of 10, maybe even 20% range. The name, "pod," must mean it has some sort of specially designed air box that increased in-flow.

Eventually I realized that a pod filter is just another name for a clamp on, free-flowing, naked air filter.

(And as with the ones for Hogs, the ones that are well designed and well made increase air flow. The cheap crappy poorly made ones often decrease air flow.)
Nonsense! I have four of them and they give me an extra 10hp each! So does the bit of chrome!
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post #15 of 16 (permalink) Old 04-26-2017, 01:25 PM Thread Starter
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awesome thank you all for all the advice and help imma rethink my mod and probably just go with the pod filter I really don't want to go through the trouble of rejetting my carbs.. (again) as I just put stage 1 dynojets on them definitely already feeling an increase of power but it does feel a little laggy because I have not tuned it yet so it has a minor blub blub effect. no worries though again thank you all for the help


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post #16 of 16 (permalink) Old 04-27-2017, 03:56 AM
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You will, or should get a huge gain in airflow with 'pod' filters too. Sooo......
Major tuning Will be Required.

Last edited by SemiFast; 04-27-2017 at 03:59 AM.
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