07-14-2021, 09:42 AM
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#1
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Registered User
Join Date: Feb 2017
Location: North Eastern US
Posts: 646
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Boxster right side exhaust vent myth
Not trying to be a jerk or anything but for years I’ve seen posts here, on other forums and on FB (2 posts today alone) that the right side vent on the 986 is an ‘exhaust’ vent. This seems to be a pervasive belief.
Sorry but the ‘right side vent exhaust’ is a Boxster myth except for one specific circumstance. The right side vent does passively release engine compartment heat when the car is at rest but only when the engine compartment cooling fan is *not* running. As designed by Porsche, at speed or when the cooling fan is running, air is taken in through the right hand vent and exhausted around the transaxle housing via pressure differential. Don’t believe it? Take a 2”x12” strip of newspaper, start the engine compartment cooling fan (preferably with your Durametric). Dangle the strip of newspaper broadside from the top of the vent - it will be sucked into the vent 
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Rgds, Fred
#317 550 Spyder Anniversary Edition 2004 Boxster S, 3.8L Flat Six Innovations engine, PSS9s, etc, etc . . .
The contents of my posts are for entertainment only. As confirmed by my many motor sports fails, I am not qualified to give product endorsements or mechanical advice 
Last edited by Oldcarguy; 07-14-2021 at 10:04 AM.
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07-14-2021, 10:33 AM
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#2
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Registered User
Join Date: Aug 2018
Location: Woodland Wa
Posts: 1,300
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Quote:
Originally Posted by Oldcarguy
Not trying to be a jerk or anything but for years I’ve seen posts here, on other forums and on FB (2 posts today alone) that the right side vent on the 986 is an ‘exhaust’ vent. This seems to be a pervasive belief.
Sorry but the ‘right side vent exhaust’ is a Boxster myth except for one specific circumstance. The right side vent does passively release engine compartment heat when the car is at rest but only when the engine compartment cooling fan is *not* running. As designed by Porsche, at speed or when the cooling fan is running, air is taken in through the right hand vent and exhausted around the transaxle housing via pressure differential. Don’t believe it? Take a 2”x12” strip of newspaper, start the engine compartment cooling fan (preferably with your Durametric). Dangle the strip of newspaper broadside from the top of the vent - it will be sucked into the vent |
Fred,
Lots of incorrect beliefs in the Boxster world.
Things like:
Narrow band O2 sensors "adjust fuel".
Narrow bandO2 sensors "read air/fuel ratios".
MAF sensors measure "air volume".
When you press the gas pedal down your giving the engine "gas".
All untrue 
Last edited by blue62; 07-14-2021 at 10:40 AM.
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07-15-2021, 09:38 AM
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#3
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Registered User
Join Date: Feb 2017
Location: North Eastern US
Posts: 646
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Quote:
Originally Posted by blue62
Fred,
Lots of incorrect beliefs in the Boxster world.
Things like:
Narrow band O2 sensors "adjust fuel".
Narrow bandO2 sensors "read air/fuel ratios".
MAF sensors measure "air volume".
When you press the gas pedal down your giving the engine "gas".
All untrue |
Agreed, lots of misinformation around.
rgds, Fred
__________________
Rgds, Fred
#317 550 Spyder Anniversary Edition 2004 Boxster S, 3.8L Flat Six Innovations engine, PSS9s, etc, etc . . .
The contents of my posts are for entertainment only. As confirmed by my many motor sports fails, I am not qualified to give product endorsements or mechanical advice
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07-15-2021, 04:33 AM
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#4
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Registered User
Join Date: Apr 2021
Location: Lansing, MI
Posts: 368
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So... it is intake then? What filter does it take?
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Current rides: 2003 Porsche Boxster MT (me), 2019 Bolt LT (me), 2015 Audi Q5 (wife), 2008 VW Rabbit (2.5 inline 5, MT, well, for kid... but you now, it is the 5 straight)
Previous: 2014 Fiat 500e, 2016 KIA Forte5 SX, 2016 Fiat 500X, and some old days: Trabant, Fiat 126p...
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07-15-2021, 09:43 AM
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#5
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Registered User
Join Date: Feb 2017
Location: North Eastern US
Posts: 646
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Quote:
Originally Posted by PLP
So... it is intake then? What filter does it take?
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Yes, Intake. Filter would be worse than worthless, it would impede the fresh air flow through the engine compartment.
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07-16-2021, 03:28 AM
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#6
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Registered User
Join Date: Apr 2021
Location: Lansing, MI
Posts: 368
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Quote:
Originally Posted by Oldcarguy
Yes, Intake. Filter would be worse than worthless, it would impede the fresh air flow through the engine compartment.
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The old guy did not hear my sarcastic tone and the emoji did not help.
It was meant to be a joke.
Anyone who ever replaced air filter should know what you said.
Funny thing is with the bottom/belly cover removed, the fan does not kick in so often.
__________________
Current rides: 2003 Porsche Boxster MT (me), 2019 Bolt LT (me), 2015 Audi Q5 (wife), 2008 VW Rabbit (2.5 inline 5, MT, well, for kid... but you now, it is the 5 straight)
Previous: 2014 Fiat 500e, 2016 KIA Forte5 SX, 2016 Fiat 500X, and some old days: Trabant, Fiat 126p...
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07-18-2021, 05:49 PM
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#7
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Registered User
Join Date: Oct 2020
Location: KY
Posts: 1,216
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Can we please add "an aftermarket tune have me 25hp" to this list?
Sent from my SM-G970U1 using Tapatalk
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2000 Box Base, Renegade Stage 1 performance mods complete, more to come
When the owners manual says that the laws of physics can't be broken by this car, I took it as a challenge...
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