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

Txstruck · 11-16-2002, 11:16 AM

As you see in my signature I have a 6.2L diesel. I am wanting to run 3" pipe just behind the cab then up thru the bed like small stacks. Problem is not many people can bend 3" pipe. So i called NAPA and they carry 3" flex pipe @$11.50/ft. Would I be better off just buying what I need in 3" pipe and get some flex pipe and take it to a shop and have them install it or just go to a shop that can actually bend the 3" and let them do the install. The only shop that could bend 3" said I would be lucky to get out of there for $250-300!

I didnt think there is that much work into bending pipe and running it thru a hole I would have already have cut for them. From what i could tell, there will be (1) 90* bend per pipe and then whatever they have to do to attach it to the collector. And the same guy quoted me $75 for a 7' section and Ill need at least 2 sections. What are yalls thought on this? Ill take any ideas/recommendations/gripes/complaints about it. TIA

arveetek · 11-16-2002, 03:36 PM

Steve,

I made my own exhaust system on the '81. I bought mandrel-bent 3" elbows from JC Whitney and 3" pipe from Summit racing. Pretty cheap that way. I can't remember how much, but the 3" elbows were like $15 or something, and I think the pipe isn't much more than that for a 4' stick.

Casey

arveetek · 11-16-2002, 03:46 PM

Steve,

I just checked Summit's website. 3" x 4' pipe is $13.39, part # SUM-640030

3.5" x 4' pipe is $14.99, part # SUM-640035

Txstruck · 11-16-2002, 04:50 PM

That sounds alot better that way. I would still pay a shop to do the welding, but I will go ahead and buy the piping myself. 1 question, to be able to mate the pipe to the collector, did you cut the flange off the old pip and retro fit it to the 3" pipe? Or can I buy a flange? I really appreciate your help Casey!

What are your thoughts on propane injection? I might be able to get a 30gl. propane tank from an S-15 truck and I would like to make a kit for injection on my intake. Any ideas?

SCOTI · 11-16-2002, 08:52 PM

You can get 3-hole flanges & have them welded to the exhaust pipe & then mate the 3" pipe to the collectors. Most of the major manufacturers carry them(Hooker for sure).

70sChevys · 11-16-2002, 09:09 PM

Steve...call Paul (the owner) at Tribe Automotive on Samuell Blvd in Dallas (don't have the number handy) and ask him if he can bend 3" pipe...he has a bender and if he can...tell him I sent you and what you need....he's a good guy that doesn't rape pricewise....he's done work for me before and was very reasonable....

arveetek · 11-17-2002, 12:10 AM

I had adapters machined that allow 2.5" pipes to be bolted directly to the stock manifolds using 2.5" three bolt collector flanges that I also got from JC Whitney. The 2.5" pipes then turn into 3" pipes.

Do your stock pipes come together in a single collector, or do you have duals already?

Propane injection only works with turbo'ed engines. On an n/a, the LP will actually displace diesel fuel. There's not enough air to burn the fuel that's already present. A turbo will force feed enough air to burn all the fuel, and the LP will then make that burn more efficient.

I've heard nitrous works with n/a diesels, but I haven't seen anyone try it, myself.

Txstruck · 11-17-2002, 10:00 AM

Kelly, I think I will wait till closer to spring to do it because of the upcoming holidays and all, but I will give the guy a call. I was frustrated with it yesterday that I instead went to the local 4x4 shop here in Plano by my job and spent some money on a new steering stabilizer shock and some offroad lights.

Casey, I was reading online yesterday at work about the propane injection and there were some places that said theirs will work with Turbo engines or N/A engines, but at a whopping price of $500-600!

You dont happen to have any extra tubos laying around do ya?

arveetek · 11-18-2002, 10:45 AM

Sorry, I got one turbo, and it's going on my '81!

11-16-2002, 11:16 AM	#1
Txstruck Registered User Join Date: Nov 2002 Location: Dallas Posts: 459	Questions about exhaust As you see in my signature I have a 6.2L diesel. I am wanting to run 3" pipe just behind the cab then up thru the bed like small stacks. Problem is not many people can bend 3" pipe. So i called NAPA and they carry 3" flex pipe @$11.50/ft. Would I be better off just buying what I need in 3" pipe and get some flex pipe and take it to a shop and have them install it or just go to a shop that can actually bend the 3" and let them do the install. The only shop that could bend 3" said I would be lucky to get out of there for $250-300! I didnt think there is that much work into bending pipe and running it thru a hole I would have already have cut for them. From what i could tell, there will be (1) 90* bend per pipe and then whatever they have to do to attach it to the collector. And the same guy quoted me $75 for a 7' section and Ill need at least 2 sections. What are yalls thought on this? Ill take any ideas/recommendations/gripes/complaints about it. TIA __________________ Steve 86 K30 4x4 6.2L Diesel\TH400\NP208 - 14bolt FF rear w/detroit locker and Dana60 front w/detroit locker- both with 4.56 gears "Runs on Mud"

11-16-2002, 03:36 PM	#2
arveetek Ultimate Diesel Dude Join Date: Oct 2002 Location: Southwest Missouri Posts: 328	Steve, I made my own exhaust system on the '81. I bought mandrel-bent 3" elbows from JC Whitney and 3" pipe from Summit racing. Pretty cheap that way. I can't remember how much, but the 3" elbows were like $15 or something, and I think the pipe isn't much more than that for a 4' stick. Casey __________________ Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's

11-16-2002, 03:46 PM	#3
arveetek Ultimate Diesel Dude Join Date: Oct 2002 Location: Southwest Missouri Posts: 328	Steve, I just checked Summit's website. 3" x 4' pipe is $13.39, part # SUM-640030 3.5" x 4' pipe is $14.99, part # SUM-640035 __________________ Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's

11-16-2002, 04:50 PM	#4
Txstruck Registered User Join Date: Nov 2002 Location: Dallas Posts: 459	That sounds alot better that way. I would still pay a shop to do the welding, but I will go ahead and buy the piping myself. 1 question, to be able to mate the pipe to the collector, did you cut the flange off the old pip and retro fit it to the 3" pipe? Or can I buy a flange? I really appreciate your help Casey! What are your thoughts on propane injection? I might be able to get a 30gl. propane tank from an S-15 truck and I would like to make a kit for injection on my intake. Any ideas? __________________ Steve 86 K30 4x4 6.2L Diesel\TH400\NP208 - 14bolt FF rear w/detroit locker and Dana60 front w/detroit locker- both with 4.56 gears "Runs on Mud"

11-16-2002, 08:52 PM	#5
SCOTI Registered User Join Date: Apr 2001 Location: DALLAS,TX Posts: 22,064	You can get 3-hole flanges & have them welded to the exhaust pipe & then mate the 3" pipe to the collectors. Most of the major manufacturers carry them(Hooker for sure). __________________ 67SWB-B.B.RetroRod 64SWB-Recycle 89CCDually-Driver/Tow Truck 99CCSWB Driver All Fleetsides @rattlecankustoms in IG Building a small, high rpm engine with the perfect bore, stroke and rod ratio is very impressive. It's like a highly skilled Morrocan sword fighter with a Damascus Steel Scimitar..... *Cubic inches is like Indiana Jones with a cheap pistol.*

11-16-2002, 09:09 PM	#6
70sChevys Registered User Join Date: Sep 2002 Location: Dallas, TX Posts: 69	Steve...call Paul (the owner) at Tribe Automotive on Samuell Blvd in Dallas (don't have the number handy) and ask him if he can bend 3" pipe...he has a bender and if he can...tell him I sent you and what you need....he's a good guy that doesn't rape pricewise....he's done work for me before and was very reasonable.... __________________ Kelly C. Hanna MMCC & Southern Bowties Club Hanna Woodworks Classic Chevy Country Last edited by 70sChevys; 11-16-2002 at 09:12 PM.

11-17-2002, 12:10 AM	#7
arveetek Ultimate Diesel Dude Join Date: Oct 2002 Location: Southwest Missouri Posts: 328	I had adapters machined that allow 2.5" pipes to be bolted directly to the stock manifolds using 2.5" three bolt collector flanges that I also got from JC Whitney. The 2.5" pipes then turn into 3" pipes. Do your stock pipes come together in a single collector, or do you have duals already? Propane injection only works with turbo'ed engines. On an n/a, the LP will actually displace diesel fuel. There's not enough air to burn the fuel that's already present. A turbo will force feed enough air to burn all the fuel, and the LP will then make that burn more efficient. I've heard nitrous works with n/a diesels, but I haven't seen anyone try it, myself. __________________ Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's

11-17-2002, 10:00 AM	#8
Txstruck Registered User Join Date: Nov 2002 Location: Dallas Posts: 459	Kelly, I think I will wait till closer to spring to do it because of the upcoming holidays and all, but I will give the guy a call. I was frustrated with it yesterday that I instead went to the local 4x4 shop here in Plano by my job and spent some money on a new steering stabilizer shock and some offroad lights. Casey, I was reading online yesterday at work about the propane injection and there were some places that said theirs will work with Turbo engines or N/A engines, but at a whopping price of $500-600! You dont happen to have any extra tubos laying around do ya? __________________ Steve 86 K30 4x4 6.2L Diesel\TH400\NP208 - 14bolt FF rear w/detroit locker and Dana60 front w/detroit locker- both with 4.56 gears "Runs on Mud"

11-18-2002, 10:45 AM	#9
arveetek Ultimate Diesel Dude Join Date: Oct 2002 Location: Southwest Missouri Posts: 328	Sorry, I got one turbo, and it's going on my '81! __________________ Project truck: '81 C/20 converted to 6.2L TURBO DIESEL bored .040", gear drive, 6.5L injectors/pump, custom pistons, custom 4" exhaust, 700R4, 4.10's Daily Driver: '95 K1500 Tahoe, 6.5L TURBO DIESEL, NP241, 4L80E, 3.42's



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