A new take on snokels

I read numerous posts regarding the de snorkeling, so I did mine last weekend. The sonic characteristics are really much less pronounced if you already have a low restriction air filter in place. As I've had time to think about it, I've decided to replace the snorkel without the #1 end cap on it. My thinking is a more directed cooler stream of air (tip is closer to outside of the vehicle than just a pulled snorkel) would be as important as air volume. However, I also think cutting the snorkel halfway down might be beneficial as the oval would be about an inch larger in diameter, thinking about it like a straw, it would make sense that a larger opening in a shorter length would add air volume. Now, I'm torn between modding the snorkel of leaving it with the end cap off, cool air Vs air volume, I know the difference is minimal but I'd like to read some other thoughts...

PS cutting the snorkel would also remove the lip around the oval which I presume is to direct the air, replacing the tip by enlarging it and blending with glass is possible but it seems like a long way to go for nothing...

[CJ_Boxster]

I already did that mod, I dont have a dyno, but the sound is alittle better than with snorkel and not as loud with the snorkel but your low end acceleration is alittle better than without the snorkel and not as good as with the snorkel in.

http://986forum.com/forums/showthread.php?t=7305
look below for images of how i made the cuts.

[2000SoCalBoxsterS]

Originally Posted by CJ_Boxster

I already did that mod, I dont have a dyno, but the sound is alittle better than with snorkel and not as loud with the snorkel but your low end acceleration is alittle better than without the snorkel and not as good as with the snorkel in.

http://986forum.com/forums/showthread.php?t=7305
look below for images of how i made the cuts.

Huh? You have to reword that better I think you have a double negative in there.

"Your low end acceleration is a little better than without the snorkel" = Your low end acceleration is better with the snorkel in.

"And not as good as with the snorkel in" = Your low end acceleration is better with the snorkel in.

I can't see how having the snorkel in or out would make any difference until you are moving a speed. So I would think that from zero to sixty you won't notice a difference, but from 50 or 60 MPH the air is flowing better through the wider openning. Right?????

The snorkel reminds me of a velocity stack. I bet the lip works the same. I think a mod'd snork that didn't neck down so much with the bell lip would be optimal.


I like CJ's mod...


Hey Bismoto, don't you want to dyno this??

[Allen K. Littlefield]

This snork mod talk has me thinking, (always a bad sign) that what if a trumpet/funnel snork was fashioned and replaced the original. Would that not a certain amount of ram effect (poor mans supercharger) into the intake thus increasing performance, at least a little bit? I notice that the stock snork seems to get larger as it enters the intake manifold which is the opposite of what I am suggesting. Also if the new Boxster/Cayman animals have a larger air vents there must be a valid reason, more cooling air perhaps? Is there a larger or should I say, more open replacement for the vent cover on earlier models? You understand I mean less metal around the opening cover and more sreen area? Any of you engineer types have any thoughts on this, Jim etc.?

AKL

Originally Posted by Allen K. Littlefield

This snork mod talk has me thinking, (always a bad sign) that what if a trumpet/funnel snork was fashioned and replaced the original. Would that not a certain amount of ram effect (poor mans supercharger) into the intake thus increasing performance, at least a little bit? I notice that the stock snork seems to get larger as it enters the intake manifold which is the opposite of what I am suggesting. Also if the new Boxster/Cayman animals have a larger air vents there must be a valid reason, more cooling air perhaps? Is there a larger or should I say, more open replacement for the vent cover on earlier models? You understand I mean less metal around the opening cover and more sreen area? Any of you engineer types have any thoughts on this, Jim etc.?

AKL

I'm not sure the effect is going to be overwhelming, I'm just trying to tweak my intake to match my lower restriction exhaust. The so called "cold air intakes" breathe from under the hood, where's the cold air in that formula? I prefer to keep the outside air sealed from the engine compartment. I may mod the snorkel, if I do I may take a different path than the one posted..

[Allen K. Littlefield]

Originally Posted by DrRoentgen

I'm not sure the effect is going to be overwhelming, I'm just trying to tweak my intake to match my lower restriction exhaust. The so called "cold air intakes" breathe from under the hood, where's the cold air in that formula? I prefer to keep the outside air sealed from the engine compartment. I may mod the snorkel, if I do I may take a different path than the one posted..

Dr. R, the evo intake closes the chamber off so only outside air (cool air) enters the cone filter. I am not so sure if this is good or not because I don't know if the opening around the stock intake area allows for some air flow over the engine and cutting it off may contribute to high engine temps. Again, the more experienced here should chime in. Cooler intake air and a cool engine are both goals that are hard in a mid-engine car. I have also seen air scoops that would tend to ram more air into the intake. I think cooling air comes in the right side vent, over and down and out the bottom so the scoops would work on the right side too. Again, I am new to this and am learning so my info. may not be totally accurate but that gives others with more knowledge to post corrections. What ever the case, have fun with your car.

AKL

Originally Posted by Allen K. Littlefield

Dr. R, the evo intake closes the chamber off so only outside air (cool air) enters the cone filter. I am not so sure if this is good or not because I don't know if the opening around the stock intake area allows for some air flow over the engine and cutting it off may contribute to high engine temps. Again, the more experienced here should chime in. Cooler intake air and a cool engine are both goals that are hard in a mid-engine car. I have also seen air scoops that would tend to ram more air into the intake. I think cooling air comes in the right side vent, over and down and out the bottom so the scoops would work on the right side too. Again, I am new to this and am learning so my info. may not be totally accurate but that gives others with more knowledge to post corrections. What ever the case, have fun with your car.

AKL

AKL,

I'm always learning as well, the sealed evo intake makes much more sense. I had read some corroborating information regarding the engine temps and de snorkeling. I'm hoping someone will post and comment on the following:

Does the snorkel taper accelerate the airflow?

Would shortening the length provide an advantage over just leaving the snorkel out?

If you shorten the length should the outer lip be enlarged and blended into the new end?

I worked on the car as a hobby all winter long in my own shop. I have enjoyed the car since the first day I drove it and improved it each year with whatever it has needed. Fact is I was so effective in my approach to perfecting my Boxster that I was awarded with a ticket this past weekend...

[Bisimoto]

Originally Posted by boxsterz

The snorkel reminds me of a velocity stack. I bet the lip works the same. I think a mod'd snork that didn't neck down so much with the bell lip would be optimal.


I like CJ's mod...


Hey Bismoto, don't you want to dyno this??

Of course. Carlos does reside near me.. would be more than happy to.

Everyone should bare in mind that venturis can also act as a restriction at certain flowrate demands based on design and inside diameter. A pure example is the simple carburator: venturis are present to present a presssure differential to help improve velocity across the smallest cross section of the venturi due to pressure differentials. This allows excellent atomization of fuel and enhances the fuel "pull" from the carb well or "float bowl". At higher RPMs, this also poses as a restriction to flow and power...hence large displacement and/or high revving engines require much larger venturis to allow for high end power production.

I have a few algorithms which I developed with emphasis on rpm & displacement...what is sad id that for 2.7~3.2L engines, the boxster intake is extremely restricted, even with the snorkle off...let alone with it installed. It is painfully obvious that that is why we saw this:



Based on experience with other highend and performance vehicles, by removing/decreasing further restrictions, and keeping the inlet temps the same, or cooler....more power gains are to be had.

[insite]

Originally Posted by Bisimoto

...what is sad id that for 2.7~3.2L engines, the boxster intake is extremely restricted, even with the snorkle off...let alone with it installed.

i bet the air box, filter and snorkel are a compromise to work with the 2.5, 2.7 and 3.2L motors. my guess is that it works best with the 2.5L since that's what the original design was for.

[CJ_Boxster]

Originally Posted by Bisimoto

Of course. Carlos does reside near me.. would be more than happy to.

Ill take you up on that offer soon, maybe in acouple months, I have to find where i up that modded snorkel first, and locate and repair a vacum leak... probably the oil tube between the engine and the firewall.

[aussieboxy]

Hi Guys,

Iv'e read about the desnorkling and the benifits and am ready, but how do I do it. Is there a walkthrough somewhere?

Thanks

[blinkwatt]

Originally Posted by aussieboxy

Hi Guys,

Iv'e read about the desnorkling and the benifits and am ready, but how do I do it. Is there a walkthrough somewhere?

Thanks

http://www.realtime.net/~rentner/Porsche/SideVents/SideVents.html

Now when you get everything taken apart you will see a tube with a cup on the end. Try to remove the cup part and then yank the tube out.

Good Luck!