Lets talk science, Stillen Gen3 Intake

MadChemist · 10-31-2013, 11:02 AM

Disclaimer: Not an engineer, I deal with molecules or smaller.

So can someone explain the physics that is occurring behind the Stillen intake? From my understanding longer tubes cause a reduced pressure within the tube due to increased drag. Reduced pressure typically means less power due to getting less air into the manifold. The only thing that I can account for in the power gain is colder air, reduced turbulence from the smooth surface of the piping, larger air filter. I think I am missing a key factor. Discuss.

H2O_Doc · 10-31-2013, 11:04 AM

Quote:

Originally Posted by MadChemist

Disclaimer: Not an engineer, I deal with molecules or smaller.

So can someone explain the physics that is occurring behind the Stillen intake? From my understanding longer tubes cause a reduced pressure within the tube due to increased drag. Reduced pressure typically means less power due to getting less air into the manifold. The only thing that I can account for in the power gain is colder air, reduced turbulence from the smooth surface of the piping, larger air filter. I think I am missing a key factor. Discuss.

I guess if they sucked it might actually be a good thing : )

Your physics sounds right to me. I think maybe add less resistance through the air filter to the list.

Chuck33079 · 10-31-2013, 11:06 AM

Quote:

Originally Posted by H2O_Doc

I think maybe add less resistance through the air filter to the list.

Yep. You want as little restriction on the intake side as possible.

Leuz · 10-31-2013, 11:11 AM

Cold air takes less space than warm air, therefore in the combustion chamber you can fit more gas. More or less, this should be the idea behind CAIs.

Chuck33079 · 10-31-2013, 11:14 AM

Quote:

Originally Posted by Leuz

Cold air takes less space than warm air, therefore in the combustion chamber you can fit more gas. More or less, this should be the idea behind CAIs.

Do you mean cold air is denser than warm air, so you can add more fuel to match the larger amount of O2 in the cylinder?

Highway · 10-31-2013, 11:15 AM

Overall, I haven't heard that they're much better than a K&N w/ a post MAF silicon tube.

But, they cost more money so they have to be better...right?....right?

Voice59 · 10-31-2013, 11:19 AM

Quote:

Originally Posted by Leuz

Cold air takes less space than warm air, therefore in the combustion chamber you can fit more gas. More or less, this should be the idea behind CAIs.

More my friend...much more. I think this is the funniest semi-accurate way I've ever seen a CAI explained. It's kind of like "Kids say the darndest things."

Chuck33079 · 10-31-2013, 11:21 AM

Quote:

Originally Posted by Voice59

More my friend...much more. I think this is the funniest semi-accurate way I've ever seen a CAI explained. It's kind of like "Kids say the darndest things."

I laughed. He's definitely not wrong.

Voice59 · 10-31-2013, 11:23 AM

Quote:

Originally Posted by Chuck33079

I laughed. He's definitely not wrong.

LoL..Kinda wrong, sorta right. LOL!

6MT · 10-31-2013, 11:43 AM

Quote:

Originally Posted by MadChemist

Disclaimer: Not an engineer, I deal with molecules or smaller.

So can someone explain the physics that is occurring behind the Stillen intake? From my understanding longer tubes cause a reduced pressure within the tube due to increased drag. Reduced pressure typically means less power due to getting less air into the manifold. The only thing that I can account for in the power gain is colder air, reduced turbulence from the smooth surface of the piping, larger air filter. I think I am missing a key factor. Discuss.

Bingo!

jlw2546 · 10-31-2013, 11:44 AM

CAI for the 370 are all way over rated and over priced. Its not needed. Just drop some reusable K&N's in there.

andre12031948 · 10-31-2013, 11:46 AM

Notice how a car when viewed from the side is shaped like a wing. Much more air & pressure is under the car than over the car. Just like a plane's wing. Flat under car vs roof & over the car. One of the places that the car's pressure (under car) goes/escapes is up through that space in front of & toward the the two stock intake openings. I & the second person on the top 25 list(redline06) run with our air cleaners off. That's not on the street, just at the track. I think I & him get lots of cool pressurized air into my stock intakes. Being in the # one spot & him being second, that idea/set up might be working very well.

I use dry K&N filters. On the street & most of the time at the track.

Red__Zed · 10-31-2013, 11:50 AM

The vast majority of the gains come from a higher flow filter.

Leuz · 10-31-2013, 11:51 AM

Quote:

Originally Posted by Chuck33079

Do you mean cold air is denser than warm air, so you can add more fuel to match the larger amount of O2 in the cylinder?

There you go!

kenchan · 10-31-2013, 11:51 AM

science? thought it was just to make the engine bay look like it had a turbo and intercooler piping.

10-31-2013, 11:02 AM	#1 (permalink)
MadChemist Enthusiast Member Join Date: Sep 2012 Location: Florida Posts: 412 Drives: 2010 370ZR Rep Power: 13	Lets talk science, Stillen Gen3 Intake Disclaimer: Not an engineer, I deal with molecules or smaller. So can someone explain the physics that is occurring behind the Stillen intake? From my understanding longer tubes cause a reduced pressure within the tube due to increased drag. Reduced pressure typically means less power due to getting less air into the manifold. The only thing that I can account for in the power gain is colder air, reduced turbulence from the smooth surface of the piping, larger air filter. I think I am missing a key factor. Discuss. luigi90210 likes this.

10-31-2013, 11:11 AM	#4 (permalink)
Leuz Track Member Join Date: Nov 2012 Location: NorCal Posts: 555 Drives: Bunny Rep Power: 14	Cold air takes less space than warm air, therefore in the combustion chamber you can fit more gas. More or less, this should be the idea behind CAIs. __________________ 2013 PW 370Z Touring+Sport, NAV Tint 35% side, 18% back \| RJM clutch pedal \| ZSpeed SS lines \| Stillen Gen3 CAI \| Fast Intentions HFC and TDX 12'' CF CBE \| UpRev

10-31-2013, 11:15 AM	#6 (permalink)
Highway Enthusiast Member Join Date: Mar 2011 Location: Indianapolis Posts: 394 Drives: Offroad Rep Power: 15	Overall, I haven't heard that they're much better than a K&N w/ a post MAF silicon tube. But, they cost more money so they have to be better...right?....right? Streetlife and megalapagas like this.

10-31-2013, 11:44 AM	#11 (permalink)
jlw2546 Base Member Join Date: Aug 2013 Location: Maryland Posts: 157 Drives: 13 370Z GM M6 Rep Power: 12	CAI for the 370 are all way over rated and over priced. Its not needed. Just drop some reusable K&N's in there. __________________ 18% tint - Swifts - SPL - H&R 20mm - F I Carbon Fiber TDX w/12in Res. - F I Hfc - R2C Short Ram Intake and a little Plasti Dip

10-31-2013, 11:46 AM	#12 (permalink)
andre12031948 Banned Join Date: Feb 2011 Location: monticello new york 127 Posts: 1,095 Drives: 08 350z black 6m/t Rep Power: 0	This is how I feel & what I do Notice how a car when viewed from the side is shaped like a wing. Much more air & pressure is under the car than over the car. Just like a plane's wing. Flat under car vs roof & over the car. One of the places that the car's pressure (under car) goes/escapes is up through that space in front of & toward the the two stock intake openings. I & the second person on the top 25 list(redline06) run with our air cleaners off. That's not on the street, just at the track. I think I & him get lots of cool pressurized air into my stock intakes. Being in the # one spot & him being second, that idea/set up might be working very well. I use dry K&N filters. On the street & most of the time at the track. Last edited by andre12031948; 10-31-2013 at 11:54 AM.

10-31-2013, 11:50 AM	#13 (permalink)
Red__Zed A True Z Fanatic Join Date: Jul 2010 Location: window seat Posts: 28,940 Drives: Mostly on two wheels Rep Power: 121	The vast majority of the gains come from a higher flow filter.

10-31-2013, 11:51 AM	#15 (permalink)
kenchan A True Z Fanatic Join Date: Aug 2009 Location: N/A Posts: 76,801 Drives: N/A Rep Power: 141521	science? thought it was just to make the engine bay look like it had a turbo and intercooler piping. shue88, luigi90210, nobdy_#608 and 1 others like this.

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