How To Tell Exhaust Pipe Diameter??? - CorvetteForum

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Notices C3 Tech/Performance V8 Technical Info, Internal Engine, External Engine, Basic Tech and Maintenance for the C3 Corvette Sponsored by: Community Links Pictures & Albums Members List Search Forums Show Threads Show Posts Tag Search Click for Advanced Search Find All Liked Posts Go to Page... how to tell exhaust pipe diameter??? Reply Subscribe Thread Tools Search this Thread Apr 15, 2014 | 01:09 PM Share Share Options #1 Sully1882 Thread Starter Melting Slicks Joined: Feb 2006 Posts: 2,092 Likes: 5 From: Fayetteville Arkansas how to tell exhaust pipe diameter??? how do you find out if your exhaust pipe is 2", 2.25" , or 2.5". Do you just measure the circumference and divide by 3.14? If I remember correctly C=3.14(D) C= circumference, 3.14 = Pi, D= diameter. So if the pipe has a circumference of 6 and divide that by 3.14 my pipes diameter should be roughly 2"? I need to go to 2.5" ..... Sully Reply 0 0 Sully1882 View Public Profile Send a private message to Sully1882 Visit Sully1882's homepage! Find More Posts by Sully1882 Apr 15, 2014 | 01:32 PM Share Share Options #2 jim-81 Drifting Joined: Dec 2011 Posts: 1,741 Likes: 286 From: Chardon Ohio Yeah that would work. C=pi*D, or D = C/pi. Or use dial caliper or even a C clamp to measure directly. Reply 0 0 jim-81 View Public Profile Send a private message to jim-81 Find More Posts by jim-81 Apr 16, 2014 | 10:30 AM Share Share Options #3 scottyp99 Le Mans Master Joined: Mar 2008 Posts: 5,948 Likes: 70 From: Oxford MA-----You just lost the game!!!! Circumference equals 3.14 times diameter, so diameter should equal circumference divided by 3.14. Scott Reply 0 0 scottyp99 View Public Profile Send a private message to scottyp99 Find More Posts by scottyp99 Dec 6, 2014 | 02:16 PM Share Share Options #4 QIK59 Melting Slicks Joined: Aug 2011 Posts: 2,875 Likes: 212 Quote: Originally Posted by Sully1882 how do you find out if your exhaust pipe is 2", 2.25" , or 2.5". Do you just measure the circumference and divide by 3.14? If I remember correctly C=3.14(D) C= circumference, 3.14 = Pi, D= diameter. So if the pipe has a circumference of 6 and divide that by 3.14 my pipes diameter should be roughly 2"? I need to go to 2.5" ..... Sully Surest way is to cut the pipe and measure right across the cut. Reply 0 0 QIK59 View Public Profile Send a private message to QIK59 Find More Posts by QIK59 Dec 6, 2014 | 03:04 PM Share Share Options #5 7T1vette Team Owner Joined: Jan 2006 Posts: 37,637 Likes: 3,101 From: Crossville TN ...or put a ruler (or tape measure) behind the pipe and 'eyeball' it... Reply 0 0 7T1vette View Public Profile Send a private message to 7T1vette Find More Posts by 7T1vette Dec 6, 2014 | 03:45 PM Share Share Options #6 Ironcross Race Director Joined: Nov 2002 Posts: 12,142 Likes: 54 From: Taylor Michigan 90% are 2 inch for most years.... only the high performance are larger......and not since the 454`s on any Reply 0 0 Ironcross View Public Profile Send a private message to Ironcross Visit Ironcross's homepage! Find More Posts by Ironcross Dec 7, 2014 | 03:23 AM Share Share Options #7 Gale Banks 80' Safety Car Joined: Nov 2008 Posts: 3,646 Likes: 528 From: Seattle Washington None of the above is correct. Unless You work with this stuff all the time the best way is to just google the size You want and get its diameter. Keep in mind that You are working with Tubing and not Pipe. They are different. If you think it is 2", it should have a diameter of 2.125 for Tubing, and if it was Pipe it would be 2.375. Just to make things interesting, there are also a couple of different Tubing classes. If you were to have a Stainless 2" Tube for Hydraulic Oil, it would not have the same diameter as a 2" Cooper one for Water Use. Use google when You need it. Reply 0 0 Gale Banks 80' View Public Profile Send a private message to Gale Banks 80' Find More Posts by Gale Banks 80' Dec 7, 2014 | 07:22 AM Share Share Options #8 76Rat Racer Joined: Jun 2013 Posts: 484 Likes: 42 From: NJ Quote: Originally Posted by Sully1882 how to tell exhaust pipe diameter??? Is this a trick question? Reply 0 0 76Rat View Public Profile Send a private message to 76Rat Find More Posts by 76Rat Dec 8, 2014 | 02:21 AM Share Share Options #9 7T1vette Team Owner Joined: Jan 2006 Posts: 37,637 Likes: 3,101 From: Crossville TN Only if you want to make an easy question ridiculously hard.... Reply 0 0 7T1vette View Public Profile Send a private message to 7T1vette Find More Posts by 7T1vette Dec 8, 2014 | 01:07 PM Share Share Options #10 69427 Tech Contributor Joined: Jun 2004 Posts: 20,296 Likes: 941 From: I tend to be leery of any guy who doesn't own a chainsaw or a handgun. Quote: Originally Posted by 7T1vette Only if you want to make an easy question ridiculously hard.... Reply 0 0 69427 View Public Profile Send a private message to 69427 Find More Posts by 69427 Dec 11, 2014 | 09:22 PM Share Share Options #11 QIK59 Melting Slicks Joined: Aug 2011 Posts: 2,875 Likes: 212 Quote: Originally Posted by 69427 Quote: Originally Posted by Gale Banks 80' None of the above is correct. Unless You work with this stuff all the time the best way is to just google the size You want and get its diameter. Keep in mind that You are working with Tubing and not Pipe. They are different. If you think it is 2", it should have a diameter of 2.125 for Tubing, and if it was Pipe it would be 2.375. Just to make things interesting, there are also a couple of different Tubing classes. If you were to have a Stainless 2" Tube for Hydraulic Oil, it would not have the same diameter as a 2" Cooper one for Water Use. Use google when You need it. OP asked about exhaust pipe mat'l (tube) not water pipe. I think the 303 SS exhaust system I built from scratch must have been 2 3/8" tubing because it measures 2 1/2" This is why I usually stay off the forum (too many trick Q & A's being taken seriously ) Can't believe just noticed in "similar threads" below same question asked 10 years ago about how to convert 7 7/8" circumference to diameter - unbelievable ?? I gotta go and drink some liquid "intelligence" - to help me deal with this stuff LOL Last edited by QIK59; Dec 11, 2014 at 09:32 PM. Reply 0 0 QIK59 View Public Profile Send a private message to QIK59 Find More Posts by QIK59 Dec 12, 2014 | 12:39 AM Share Share Options #12 Ironcross Race Director Joined: Nov 2002 Posts: 12,142 Likes: 54 From: Taylor Michigan Quote: Originally Posted by Gale Banks 80' None of the above is correct. Unless You work with this stuff all the time the best way is to just google the size You want and get its diameter. Keep in mind that You are working with Tubing and not Pipe. They are different. If you think it is 2", it should have a diameter of 2.125 for Tubing, and if it was Pipe it would be 2.375. Just to make things interesting, there are also a couple of different Tubing classes. If you were to have a Stainless 2" Tube for Hydraulic Oil, it would not have the same diameter as a 2" Cooper one for Water Use. Use google when You need it. This is a automotive site not a hardware store....Pipe or tubing which goes by both names depending on the site..We can use tubing if it makes you happy, I personally prefer to call it pipe, ......We custom bend jobs in our service bays or sell complete systems for the do it yourselfer in our parts department.....Our shopp uses a Ben Pearson pipe bender and bend all sizes up to and including 3 inch....the pipe comes in sizes from 1 1/2 to 5 that we use and is measured as outside diameter and the mufflers slide over the pipe...Most systems are 2 inch....And yes we can just by looking at the pipe identify the diameters....Exhaust pipe or tubing is the same size if its stainless or steel Reply 0 0

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