exhaust question - The 1947 - Present Chevrolet & GMC Truck Message Board Network

76bonanza · 05-27-2004, 06:55 PM

When they say 2 1/4 and 2 1/2 inch are they say outside diameter? Trying to measure mine one the truck with big tips so can not get to the ends. But atempting to measure with t square looks like it is 2 1/4 outside diameter or close to it.

Does that I have 2 1/4 inch?

Thanks

76bonanza · 05-28-2004, 07:27 AM

Anyone????

jimfulco · 05-28-2004, 11:53 AM

Outside diameter. Tie a string around it, then cut it off & measure the string. Divide by 3.14, & you have the diameter.

PHOENIX · 05-28-2004, 12:06 PM

- Incorrect Information -

76bonanza · 05-29-2004, 12:01 PM

Eddie are you backwards on that summit and jegs sells all there tubing by outside diameter?

Just trying to make sure I have mine right.

PHOENIX · 06-01-2004, 06:24 PM

I called Summit a few minutes ago and asked if they measure their exhuast tubing by I.D. or O.D. and the sales guy said I.D.
On Jegs website they say O.D.
So I dont know which is right.

Did you figure out which you have yet?

76bonanza · 06-01-2004, 06:29 PM

Well my o.d. is 2.25.

PHOENIX · 06-01-2004, 06:31 PM

I edited my last post cause I wasnt sure where I ordered the pipe from.
I am going to measure the stuff I have at home and post what I find out.
I know when I ordered all the exhuast stuff I had the same question.
Dont remember what the says people told me back then.

EricS76 · 06-01-2004, 06:57 PM

Exhaust tubing is measured in O.D. Accessories such as mufflers, cats, tips are measured in I.D. Most likely, they'll both just be called 2.5 or 3 or 2.25 or whatever, with no o.d. or i.d. listed. But most mufflers and cats and tips are expanded to I.D. to allow the tubeing to slide into them. Some companies such as JC Whitney have 45, 90, and 180 degree bends that have an I.D. end and an O.D. end. They call it swaged or expanded. But for the most part, straight tubing is measured in O.D.

PHOENIX · 06-01-2004, 07:28 PM

Yeah I had it mixed up. Sorry for the mistake.
The pipe is measured O.D., the 3" pipe I have is slightly bigger then 3" O.D. though.
The 3" pipe I have (purchased from Jegs) is 3" from center of wall to center of wall. I.D. is slightly less then 3" and O.D. is slightly larger then 3".
The accessories are measured by I.D. and are also slightly over sized too.
The O.D. of the pipe is closer to the actual measurement then the I.D. of the accessories.

EricS76 · 06-01-2004, 07:38 PM

Yeah it gets confusing. The first exhaust I did, we didn't have a tubing bender or expander. I had to order a few adapters to make it work, and I got the ID and OD confused, and only one of them ended up working out of 4. Wasn't too good.

SanitysBane · 06-01-2004, 10:23 PM

on my good old jaming the pipes to gether worked, ugly but it works!

05-27-2004, 06:55 PM	#1
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	exhaust question When they say 2 1/4 and 2 1/2 inch are they say outside diameter? Trying to measure mine one the truck with big tips so can not get to the ends. But atempting to measure with t square looks like it is 2 1/4 outside diameter or close to it. Does that I have 2 1/4 inch? Thanks __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-28-2004, 07:27 AM	#2
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Anyone???? __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

05-28-2004, 12:06 PM	#4
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	- Incorrect Information - __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * Last edited by PHOENIX; 06-01-2004 at 07:29 PM.

05-29-2004, 12:01 PM	#5
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Eddie are you backwards on that summit and jegs sells all there tubing by outside diameter? Just trying to make sure I have mine right. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

06-01-2004, 06:24 PM	#6
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	I called Summit a few minutes ago and asked if they measure their exhuast tubing by I.D. or O.D. and the sales guy said I.D. On Jegs website they say O.D. So I dont know which is right. Did you figure out which you have yet? __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * Last edited by PHOENIX; 06-01-2004 at 07:37 PM.

05-28-2004, 11:53 AM	#3
jimfulco Registered User Join Date: May 2003 Location: Shreveport LA Posts: 3,170	Outside diameter. Tie a string around it, then cut it off & measure the string. Divide by 3.14, & you have the diameter.

06-01-2004, 06:29 PM	#7
76bonanza Senior Member Join Date: Mar 2003 Location: St robert Mo Posts: 2,001	Well my o.d. is 2.25. __________________ 1968 c10 lowered 3" 4" 355/Th400 built by Hatfield racing in joplin MO

06-01-2004, 06:31 PM	#8
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	I edited my last post cause I wasnt sure where I ordered the pipe from. I am going to measure the stuff I have at home and post what I find out. I know when I ordered all the exhuast stuff I had the same question. Dont remember what the says people told me back then. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION *

06-01-2004, 06:57 PM	#9
EricS76 Registered User Join Date: May 2004 Location: Llano,TX Posts: 113	Exhaust tubing is measured in O.D. Accessories such as mufflers, cats, tips are measured in I.D. Most likely, they'll both just be called 2.5 or 3 or 2.25 or whatever, with no o.d. or i.d. listed. But most mufflers and cats and tips are expanded to I.D. to allow the tubeing to slide into them. Some companies such as JC Whitney have 45, 90, and 180 degree bends that have an I.D. end and an O.D. end. They call it swaged or expanded. But for the most part, straight tubing is measured in O.D. __________________ ‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop. '77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed. '80 jeep CJ-5. ‘14 Chevy 1500 Z71… Last edited by EricS76; 06-01-2004 at 07:29 PM.

06-01-2004, 07:28 PM	#10
PHOENIX Registered User Join Date: Oct 2002 Location: Phoenix, Arizona Posts: 4,703	Yeah I had it mixed up. Sorry for the mistake. The pipe is measured O.D., the 3" pipe I have is slightly bigger then 3" O.D. though. The 3" pipe I have (purchased from Jegs) is 3" from center of wall to center of wall. I.D. is slightly less then 3" and O.D. is slightly larger then 3". The accessories are measured by I.D. and are also slightly over sized too. The O.D. of the pipe is closer to the actual measurement then the I.D. of the accessories. __________________ * AVOID: LOPER'S PERMORANCE / LOPERSPEED.COM OF PHOENIX, AZ & COTTMAN TRANSMISSION * Last edited by PHOENIX; 06-01-2004 at 07:35 PM.

06-01-2004, 07:38 PM	#11
EricS76 Registered User Join Date: May 2004 Location: Llano,TX Posts: 113	Yeah it gets confusing. The first exhaust I did, we didn't have a tubing bender or expander. I had to order a few adapters to make it work, and I got the ID and OD confused, and only one of them ended up working out of 4. Wasn't too good. __________________ ‘66 Chevy C-10, long bed fleetside, 350, 3 on the tree, 4-7 drop. '77 chevy C-10 Custom Deluxe, 350, SM465 4 speed, flatbed. '80 jeep CJ-5. ‘14 Chevy 1500 Z71…

06-01-2004, 10:23 PM	#12
SanitysBane Registered User Join Date: May 2004 Location: Lubbock, Texas Posts: 2,121	on my good old jaming the pipes to gether worked, ugly but it works! __________________ '96 Nissan Pathfinder '02 Firebird Trans Am. '88 K5 Blazer



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