Exhaust/ Building from pre-bent parts, Confusing!!!

[rooster]

I have been looking around for information to help in the selecting the right ID's and OD's of pipes to piece together. I have tryed the net, with no luck.

Does such a place exist?

Very confusing!!!!!!!!!

Is it just me?

[1FATGMC]

I have been looking around for information to help in the selecting the right ID's and OD's of pipes to piece together. I have tryed the net, with no luck.

Does such a place exist?

Very confusing!!!!!!!!!

Is it just me?

Are you talking about what sizes to use or what slides into what?

For the first exhaust on 1FATGMC I bough a dual exhaust system from J.C. Whitney for a Camaro and cut it up and re-welded it and it worked fine for 100,000 miles.  It was 2 1/4 inch pipes.  I didn't get the mufflers from them.

What I have on there now came from Summit.  I ordered pre-bent bends and some straight pipe and made the new exhaust system.  It is all welded together except for the cross-over pipe.  It is held together in the middle with one of those long band clamps and that has worked good.  This way I can remove the sides independently.

I see people spend some pretty big money on exhausts, but I think it is really easy and fast to put your own together unless you want something like polished stainless.

I coat all of the pipes.  Even though the headers have over 125,000 miles on them with no leaks using Eastwood stainless paint I'll have the next ones comercially coated.

c ya, Sum

[rooster]

Are you talking about what sizes to use or what slides into what!

c ya, Sum[/quote]

Yes!

Around here its 300 bucks for openers, you bring the mufflers, duel exhaust!

This complacate things ! We have a existing head pipe 2 1/8"OD we want to join that to a 2 5/8" OD flowmaster from that size to a 2 1/4"OD used tail pipe, its pre-bent to go over the axel.

This will be a price choppers exhaust system! We think!

Was hoping to find a program that might figure this! Havent found anything, I guess I can draw it out.

[enjenjo]

Ok, I think you want to slip one pipe over a smaller pipe, and do that until you get up to 2 1/2 for the muffler. Is that correct?

standard pipe sizes are 1 3/4", 2", 2 1/4", 2 1/2", and 3" None of them fit tightly on the next smaller pipe, you have from 1/16" to 3/32 gap", depending on the gauge of the pipe. Most auto parts stores sell exhaust pipe reducers to adapt one size pipe to another, but I normally don't use them, as they are pretty thin steel.

What I do is roll the end of the larger pipe in, over a trailer hitch ball held in a vise, and the smaller one out with a pipe held in the vise, so I can butt weld them together.

This took less than a minute to do for these pictures.

[enjenjo]

Now lets say you want to go from 2", to 3". You can't roll the pipe enough to get a smooth seam. So what I do in that case is cut a piece of the larger pipe 8" long or so. Then I cut a long V lengthwise in the pipe about 7 1/2" long, no material removed at one end, and enough at the other end,to make the circumference so the part that is left the same as the smaller pipe, you know, Pi2r, and all that.

I then squeeze that end together with a couple worm type hose clamps, so it ends up 2" diameter, it doesn't need to be exactly round yet. Weld up the cut, work it back round on a anvil of some type, square the ends, and weld the other pipes to it.

[rooster]

Very good Enjenjo! Its still sinking in!

[Crosley.In.AZ]

pictured are the pipes I built to run exhaust over the diff under my dodge lancer...... 2.5 inch diameter tubes, mandrel bent