A bit of physics involved

A bit of physics involved - Saab Performance Bulletin Board - Saabnet.com

The banner above is an advertisment - if it asks you to download software, please ignore.
Site News - 7/1: Members: Log In to See Fewer Ads! | 5/28: SAAB Evolutions/TSN T-Shirts $14

Performance Bulletin Board
[Subscribe to Daily Digest]

(Search Author's Posts: e.g. Keyword:username) *Members Only

[Main Performance Bulletin Board | BBFAQ | Prev by Date | Next by Date | Post Followup ] Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
A bit of physics involved Posted by turbocon86 (more from turbocon86) on Thu, 1 Feb 2007 13:31:54

In Reply to: Re: Agreed..., John Williams

[Profile/Gallery] , Wed, 31 Jan 2007 12:23:24 Members do not see ads below this line. - Help Keep This Site Online - Signup

Pretend our four cylinder engines are actually a four storey building. On each floor is a fireplace (the cylinder). They are all tied into the same chimney (the exhaust). The fireplace on the first floor will have the longest flue and if properly sized will draw the most air into the firebox as the hot air is drawn up to the lower atmospheric pressure of the outside cooler air at great speed creating a vacuum. The fireplace on the fourth floor will not draw as well because of the shorter flue. If all the flues were the same length they would all draw the same. If the chimney stack
were shortened all the fires would be negatively impacted.

Also If there is a condition inside the building where the atmospheric temperature or pressure are equal to the outside of the building the chimney won't draw at all. The burn is insufficient to create convection. Open the door to the outside (open the intake particularly to cooler air)and suddenly you have a properly drafting flue and a nice little fire.

Any HVAC guy knows how to size a flue properly, both length and diameter, for the most efficient burn. I wish it were that simple to calculate the same for an exhaust system on a car.

posted by 169.226.135...

Posts in this Thread:

Performance with muffler/ without!!!!!!!, Aerohead , Tue, 30 Jan 2007 14:34:02
- Re: Performance with muffler/ without revealed..., matsuda, Thu, 8 Feb 2007 17:08:15
- Re: Performance with muffler/ without!!!!!!!, SWEDISH DYNAMICS, Tue, 30 Jan 2007 15:37:32
  - Velocity and Scavenging...myth?, Chad, Wed, 31 Jan 2007 06:41:03
    - Scavenging is for increasing the VE of N/A engines..., Jonathan Scupin , Thu, 1 Feb 2007 20:02:39
      - Re: Scavenging is for increasing the VE of N/A engines..., Aerohead , Fri, 2 Feb 2007 16:00:05
      - Yea, but the engines are na until the turbo spools!, John Williams , Fri, 2 Feb 2007 12:00:27
        they're really not, TML , Sun, 4 Feb 2007 13:50:18
        Re: Yea, but the engines are na until the turbo spools!, Chad, Fri, 2 Feb 2007 12:27:43
        good point, John!, Jonathan Scupin , Fri, 2 Feb 2007 12:18:40
      - Re: Scavenging is for increasing the VE of N/A engines..., Chad, Fri, 2 Feb 2007 07:23:52
        Re: Scavenging is for increasing the VE of N/A engines., Jonathan Scupin , Fri, 2 Feb 2007 07:44:17
        Re: Scavenging is for increasing the VE of N/A engines., Chad, Fri, 2 Feb 2007 08:43:44
    - Heady stuff, turbocon86, Wed, 31 Jan 2007 08:41:45
      - I cannot fathom how exhaust flow can cause vacuum..., Chaz, Wed, 31 Jan 2007 10:49:52
        Re: I cannot fathom how exhaust flow can cause vacuum..., John Williams , Wed, 31 Jan 2007 11:46:12
        Agreed..., Chad, Wed, 31 Jan 2007 11:53:56
        Re: Agreed..., Aerohead , Wed, 31 Jan 2007 12:36:21
        Re: Agreed..., John Williams , Wed, 31 Jan 2007 12:23:24
        A bit of physics involved, turbocon86, Thu, 1 Feb 2007 13:31:54 <-- Viewing This Message
        2 Strokes are radically different..., Chaz, Wed, 31 Jan 2007 16:32:21
        Re: 2 Strokes are radically different..., John Williams , Wed, 31 Jan 2007 17:23:55
        Re: 2 Strokes are radically different..., lms, Wed, 31 Jan 2007 16:59:41
        2-stoke tuning, paul o., Wed, 31 Jan 2007 18:35:12
        Re: 2-stoke tuning, John Williams , Wed, 31 Jan 2007 19:47:44
        2-stroke tuning compared to my SPG, dannyboy, Wed, 31 Jan 2007 23:00:40
        Re: 2-stroke tuning, paul o., Thu, 1 Feb 2007 11:19:28
        That is a great diagram!!!, John Williams , Thu, 1 Feb 2007 13:01:29
        Re: 2-stroke tuning compared to my SPG, Chad, Thu, 1 Feb 2007 09:34:54
        Re: 2-stroke tuning compared to my SPG, John Williams , Thu, 1 Feb 2007 10:08:02
        Re: 2-stroke tuning compared to my SPG, John Williams , Thu, 1 Feb 2007 08:53:29

Members do not see ads below this line. - Help Keep This Site Online - Signup

Post a Followup

No Site Registration is Required to Post - Site Membership is optional (Member Features List), but helps to keep the site online
for all Saabers. If the site helps you, please consider helping the site by becoming a member.

Name: Member Login / Signup - Members see fewer ads. - Latest Member Gallery Photos
E-Mail: (Optional)
Re-Enter E-Mail: (Confidential & Secure - Not revealed to other users!)
Note: Please check your spam folder for BB responses.

Subject:

Posting rules are simple - No for sale/wanted ads may be posted here - use the site classifieds.
You may not cross-post your message to multiple BBs.
Not permitted: political/religious topics and being disrespectful (personal attacks, insults, etc...).
Site Members do not see any red text, inline ad links, bottom of page anchor ads, box ads, or anti-spam check.

Message: (please no for sale/wanted classifieds - post those in the Saabnet.com Classifieds)
Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).

Links are now automatically made active, no need for any special code (or use the Option Link field below) - don't put links in () or end with a '.'
To add inline images to your post above, use [img]http://www.domain.com/img.jpg[endimg] (or use the Optional Image Link field below).
Optional Link: (e.g. http://www.saabnet.com/)
Link Title: (Optional)
Optional Photo/Image Link: (e.g. http://www.saabnet.com/img.jpg)
Photo/Image to Upload: (Please be patient while file uploads)

Prev by Date: Re: Radar Detectors effective against Good Humor Salesm, turbocon86, Thu, 1 Feb 2007 13:03:25
Next by Date: it's a debatible topic, JordanP, Thu, 1 Feb 2007 15:43:53
Main Performance Bulletin Board

StateOfNine.com

SaabClub.com

Jak Stoll Performance

M Car Covers

Ad Available

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

Random Saabnet.com Member Gallery Photos (Click Image)

This is a moderated bulletin board - Posting is a privilege, not a right. Unsolicited commercial postings are not allowed (no spam). Please, no For Sale or Wanted postings, SERIOUSLY. Classifieds are to be listed in The Saab Network Classifieds pages. This is a problem solving forum for over 250,000 Saab owners, so expect to see problems discussed here even though our cars are generally very reliable. This is not an anything goes type of forum. Saabnet.com has been a moderated forum since 1988. For usage guidelines, see the Saabnet.com Mission and Purpose Page. Please remember that you are not anonymous. Site Contact | Site Donations | Other Sites by SP - Poverty2Prosperity.org | Run Club Menlo Park | ScreenBot

Site Members do not see red text instructions, bottom of the page anchor ads, or box ads.
Click here to see all the Site Membership Benefits!

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com. For usage guidelines, see the Mission & Privacy Notice. [Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]

The content on this site may not be republished without permission. Copyright © 1988-2024 - The Saab Network - saabnet.com.
For usage guidelines, see the Mission & Privacy Notice.
[Contact | Site Map | Saabnet.com on Facebook | Saabnet.com on Twitter | Shop Amazon via TSN | Site Donations]