OK Mathmaticians, Q?
I've got a 45* (that's degree) mandrel bend that I need to cut to bring the horizontal leg level with the exhaust pipe on the other side.
How much do I cut off the vertical leg in order to raise the horizontal leg 2 3/4"?
I'm gonna' lean on y'all 'cause I don't know what to call this math formula in order to look it up on the innerwebs.
How much do I cut off the vertical leg in order to raise the horizontal leg 2 3/4"?
I'm gonna' lean on y'all 'cause I don't know what to call this math formula in order to look it up on the innerwebs.
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[:0] is my reply....I'm good at money math but this is above me [:D]. Good luck on this one, I'll bump it up for you though [;)] 0 -
I'm a math teacher but honestly don't understand the question.....
If you're cutting the vertical leg, wouldn't you lower the horizontal? (unless its upside down I guess)
If so, if you cut 2 3/4 off the vertical, wouldn't it raise the horizontal that much?0 -
I am pretty sure it depends on the diameter of the pipe. 0 -
assume the other end will have a 45* bend also ....just draw it out on graph paper..each square = 1/4" or what ever increment suits 0 -
quote:Originally posted by US Military Guy
I am pretty sure it depends on the diameter of the pipe.
I'm positive that it does0 -
Too many unknowns. Draw to scale the pipe and sketch in the end result your after and you should be able to figure it out. 0 -
I'm with rob on this one. You have a 45 degree bent pipe. If you are saying vertical I assume there are straight sections after the bend. If so, I don't see your problem. You just cut 2 3/4" off. Now if there are no straight sections you have a problem. You would need to miter cut your existing pierce and then do the same with the downstream pipe. This would be an ugly joint (but doable) and not the best plan for an exhaust system. Give us some more info Scott, we can help. 0 -
The crux of the biscuit is the apostrophe. 0 -
I had to find an image online. NOT showin' y'all my scabby welds.
I'm welding new 1 1/2" pipe onto a section of the factory head pipe. What I needed to do is cut leg A in order to move leg B up where it would be level with the pipe on the other side of my ride.
When cutting a 90* bend it's a simple matter of cutting off the required length, say two inches. Cutting a 45* bend requires a different length cut off. Simply cutting off two inches won't bring leg B high enough, but cutting off four inches would raise it too high. At least that's how I understand it.
At any rate, I solved the problem by trial and error erring on the cautious side. It's still an 1/8" low, but nobody but a nitpicker with a tape measure will notice that difference.
I thought to ask you'lls because it would save me some time, which I'm kinda' pressed for right now. Buuuuuut, I got impatient and started whacking away with the hacksaw a 1/2 inch at a time.[:I]0 -
22-1/2 0 -
You need to remove 3 57/64" off your 45 degree leg to raise the horizontal 2 3/4" 0 -
I'd just buy some $5 flex pipe if it was me and be done with it, I'm the King of "improvising" [:D], it's always worked well for me [}:)] 0 -
quote:Originally posted by Junkballer
I'd just buy some $5 flex pipe if it was me and be done with it, I'm the King of "improvising" [:D], it's always worked well for me [}:)]
Actually, the 5' of stainless flex pipe I have for the outer (pseudo heatshield) pipe was, IIRC, $74. I've had this stuff on hand for so long I've forgotten what I paid for it. This project should have been completed back in summer of '08.0 -
Is this exhaust system for something special ? 0 -
quote:Originally posted by Junkballer
Is this exhaust system for something special ?
Yeah, Baby.
https://i.imgur.com/HCJre0ql.jpg[/img]
I had to do the down and dirty duals just to get her back on the road and just wasn't enthused with the way the left pipe pulled back and then down. Angling down and then back not only looks better, IMHO, but also it gets the pipe further from the passenger peg.
Plus, I'm getting rid of the HD mufflers. I like'em and all, but when I install the hard bags I'd have to move them back 4"-5" and that would look funky also. Haven't decided yet If I'll stay with straight pipes or add fishtail slip ons.0 -
quote:Originally posted by asphalt cowboy
I had to find an image online. NOT showin' y'all my scabby welds.
I'm welding new 1 1/2" pipe onto a section of the factory head pipe. What I needed to do is cut leg A in order to move leg B up where it would be level with the pipe on the other side of my ride.
When cutting a 90* bend it's a simple matter of cutting off the required length, say two inches. Cutting a 45* bend requires a different length cut off. Simply cutting off two inches won't bring leg B high enough, but cutting off four inches would raise it too high. At least that's how I understand it.
At any rate, I solved the problem by trial and error erring on the cautious side. It's still an 1/8" low, but nobody but a nitpicker with a tape measure will notice that difference.
I thought to ask you'lls because it would save me some time, which I'm kinda' pressed for right now. Buuuuuut, I got impatient and started whacking away with the hacksaw a 1/2 inch at a time.[:I]
Ahhh, a TRIG problem. The image makes your 'problem' much clearer.
Neat 'thing' about a 45 degree right triangle is the legs are '1' and the hypotenuse is the square root of 2.
And one can use those 'constants' to figure out any size 45 degree right triangle.
The 'fly in the ointment' was when you used 'vertical leg' when (correct me if I'm wrong) you meant 'how much do I have to cut from the 'angled leg' to raise ........
Dimensions will definitely help in this case.
Edit: (too little, too late) my SWAG is 3.9 inches off the angled pipe.
How much did you end up cutting off?0 -
quote:Originally posted by asphalt cowboy
quote:Originally posted by Junkballer
Is this exhaust system for something special ?
Yeah, Baby.
Now I see it is, agree that's special...[;)]0 -
quote:Originally posted by iceracerx
[Dimensions will definitely help in this case.
Edit: (too little, too late) my SWAG is 3.9 inches off the angled pipe.
How much did you end up cutting off?
I don't recall how much I initially needed to raise it. Plus, before I posted this I had already cut 3" off. What was originally a 12" leg is now 5 1/2" give or take so I cut roughly 7 1/2" off. Fortunately, the factory head pipe is a Very snug fit inside the mandrel bend so I did have a bit of fudge factor.
There were more than a few vulgarities uttered, but the left inner pipe and baffle are now done.0 -
Here's an illustration that you and others may find handy in the future.
Initially you asked how much material needed to be removed from a exhaust tube with a 45 degree bend, in order to raise the horizontal part of the pipe 2.75 inches.
As I posted, a 45 degree right triangle has sides of '1' and a hypotenuse of 'the square root of 2' and these 'constants' can be used to solve some simple Trigonometry.
Thus: You want to raise point A to point A'
The distance from A to A' would be 2.75 inches.
Removing the 'material' from AC would give you the result you want.
AB = 2.75"
AA' = 2.75"
Remember learning about the Pythagorean Theorem way, way, back when?
A^2 + B^2 = C^2 ring a bell? ( ^2 is the symbol for 'squared')
In this case AB^2 + BC^2 = AC^2
If AB = AA' = BC = 2.75"
Then 2 x 2.75^2 = AC^2 (the Hypotenuse)
2 x 7.5625 = 15.125 = AC^2
The square root of 15.125 = AC
AC = 3.8890 inches (I'm pretty sure that 9 thousandths won't matter much is this case and rounded to the nearest 'tenth' (100 thousandths where I come from)
I'll try to be quicker next time
As ever, Dr Pedantic0
![https://i.imgur.com/HCJre0ql.jpg[/img]](https://i.imgur.com/HCJre0ql.jpg[/img]){kind=link}
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