piping bend threw cut and weld?

[poshatch]

hey everybody

so ive been trying to wrap my brain around how to cut little sections out of straight piping to get it to do a gradual bend but everything i try does not turn out like it does on paper

anybody on here have suggestions for what they did?

basically trying to make a downpipe and turbo elbow but i dont want to take it to an exhaust shop cause i dont want crush bends



if you dont know what im talking about ^ is it

i appreciate any help i can get

[Chaluska]

hey everybody

so ive been trying to wrap my brain around how to cut little sections out of straight piping to get it to do a gradual bend but everything i try does not turn out like it does on paper

anybody on here have suggestions for what they did?

basically trying to make a downpipe and turbo elbow but i dont want to take it to an exhaust shop cause i dont want crush bends



if you dont know what im talking about ^ is it

i appreciate any help i can get

its all in the angles you cut.

drawing it out on paper, with a straight edge, to EXACT sizing should yield identical results

[donandal]

Those " bends " are actually best made from sections of mandrel bent tubing that
you would cut on an angle (pie cut) and then welded to change the axis of the pipe's bend
to accomplish a change in direction.... the mandrel bent tubing can be found
online in mild or stainless steel and are not crush bent

[poshatch]

yeah i saw this



from one of my fav places to visit online =]

so yea i think if i trace it out on paper and cut it it would work

would you tape it on the pipe though? wouldnt the curvature of the paper warp the overall result, i guess ill just have to try it to see if it does real quick

thanks for the tip, ive tried doing it with just math and i keep leaving something unaccounted for

and i just did a mock up of this i just made just now, the pipe seems to go where i want it well away from everything, but would this be the right way to cut it?

[terry_240sx]

i always wanted to know how to make bends like that.
i wanted to make a downpipe like the pbm one for my ka-t
let us know how what your making turns out!

[poshatch]

i always wanted to know how to make bends like that.
i wanted to make a downpipe like the pbm one for my ka-t
let us know how what your making turns out!

you got it im making it for my ka-t

[terry_240sx]

you got it im making it for my ka-t

nice!
i ended up having to get a crush bent angle made for my downpipe.
it looks like it flows like crap
but it works! lol

[donandal]

hi terry_240sx and poshatch,
for future reference, i used mandrel bends (not crushed) from
Columbia River Mandrel Bending... can order online and prices are
good.....the quality of bends is perfect...the bend radius selection
is pretty good too... if you need tight bends...
they have thick wall stuff too...I used some of that also for a header
409 series stainless may slightly rust..304 stainless won't
takes a lot of work out of building pipes

[poshatch]

yeah i ended up going to tognottis and buying u bends and cutting them in half and forming them that way ill show you my dp and dump tube

pretty good if i say so...





id like to of had the cut and welds but that was way way way too much cutting for me i needed this done asap lol

[terry_240sx]

Downpipe and dumptube both look great!
Good idea having that flex section, that's what i did also.

[poshatch]

thanks thanks! took awhile but it did turn out pretty good

20 bucks for the 2.5 and 10 bucks for the 1 3/8 dump and like 25 bucks for the flex section