Ask an Engineer

[Ocean1]

The B stands for British. This probably goes a long way to explaining the tolerances and why some bits have to be matched to selected other bits. Its part of the standard and part of the licencing agreement, which is incidentally why the Germans didn't get accredited and begrudgingly had to follow the French lead which as you can imagine caused much grumbling and probably lead to the first and second world war.

Give 'em credit for more or less inventing "standards" though.

I recall an old tutor waxing lyrical on the topic of Mr Whitworth's invaluable system, whereby a cylinder made in Manchester, (maybe) could be fitted with a piston made in Leeds such that one could barely fit one's hand between them.

May have been some poetic licence involved but you get the drift.

[husaberg]

Give 'em credit for more or less inventing "standards" though.

I recall an old tutor waxing lyrical on the topic of Mr Whitworth's invaluable system, whereby a cylinder made in Manchester, (maybe) could be fitted with a piston made in Leeds such that one could barely fit one's hand between them.

May have been some poetic licence involved but you get the drift.

Pretty sure the poms invented the Poetic licence and the waxing lyrical as it helped sell more shoddy rust overnight Morris's and Austin's with MG and Woolsey badges.

[bogan]

The B stands for British. This probably goes a long way to explaining the tolerances and why some bits have to be matched to selected other bits. Its part of the standard and part of the licencing agreement, which is incidentally why the Germans didn't get accredited and begrudgingly had to follow the French lead which as you can imagine caused much grumbling and probably lead to the first and second world war.

True, and I guess the P is for what some operators must be on to achieve said tolerances while doing such a simple task.

Dear Bogan, now I understand.
Your questions aren't really questions are they? It's just a thinly veiled whinge.
Next time try a. Friday night rant thread b. Expressing yourself clearly
Here's a clue: starting by asking ' what the fuck...?' Is never going to open the door wide to positive and proactive communication.
But then, that was never the point anyway as per my initial observation.

Yet, I received quality answers from the other respondents, as was the point. So perhaps you can fuck off and get a clue (veil thin enough, and expression clear enough for you?) before being so quick to whinge about how I choose to phrase my question.

[Brian d marge]

Give 'em credit for more or less inventing "standards" though.

I recall an old tutor waxing lyrical on the topic of Mr Whitworth's invaluable system, whereby a cylinder made in Manchester, (maybe) could be fitted with a piston made in Leeds such that one could barely fit one's hand between them.

May have been some poetic licence involved but you get the drift.

and its a damn good thread form too!

[schrodingers cat]

Yet, I received quality answers from the other respondents, as was the point. So perhaps you can fuck off and get a clue (veil thin enough, and expression clear enough for you?) before being so quick to whinge about how I choose to phrase my question.

Jolly good.
I think my fuck off has more class than yours but it's only ever opinion and it is the Internet after all.

[bogan]

The B stands for British. This probably goes a long way to explaining the tolerances and why some bits have to be matched to selected other bits. Its part of the standard and part of the licencing agreement, which is incidentally why the Germans didn't get accredited and begrudgingly had to follow the French lead which as you can imagine caused much grumbling and probably lead to the first and second world war.

Anyone know a good source for exhaust parts? off the shelf tube bends, weld flanges/fittings, mufflers (complete or as parts); one to do for the bike, one for the car.

[nzspokes]

Segidins auto parts. Spelt wrong but they have a lot of that stuff.

http://www.segedins.com/

[husaberg]

Anyone know a good source for exhaust parts? off the shelf tube bends, weld flanges/fittings, mufflers (complete or as parts); one to do for the bike, one for the car.

I have always had good luck with the local muffler shop they are happy to sell off the shelf preformed mandrel bends.
If you want something a little more exotic maybe try Wobbly he has a program to spit out rather nice pipes that are made in sections and are able to be directly laser cut.
Pretty sure its compatible with solid works.

http://www.kiwibiker.co.nz/forums/at...9&d=1413021847
They end up like this, Although he is a two stroke guy, he designed the Britten pipes




Failing that maybe consider hydroforming them. (Bike not the car)
http://www.kiwibiker.co.nz/forums/sh...-exhaust-pipes
That's what Pete Gibson used to do for the SOS racers in the nineties

[Ocean1]

I have always had good luck with the local muffler shop they are happy to sell off the shelf preformed mandrel bends.

That's it. I used to go burgle the local pit stop scrap bin, and anything I needed that wasn't there I'd simply buy off their rack. Their discounts with suppliers are so good they can make good beer money from me at prices I can't match going straight to S&T or any other principal.

Except donuts, a guy in Lower Hutt makes them, I buy them straight from him but places like TWL stock them at almost reasonable prices.

Having said that it's been a couple of years since I made anything out of zorst choob. I'm so used to using stainless if I had to make a pipe for a bike or a car I think I'd just use 304...

[husaberg]

That's it. I used to go burgle the local pit stop scrap bin, and anything I needed that wasn't there I'd simply buy off their rack. Their discounts with suppliers are so good they can make good beer money from me at prices I can't match going straight to S&T or any other principal.

Except donuts, a guy in Lower Hutt makes them, I buy them straight from him but places like TWL stock them at almost reasonable prices.

Having said that it's been a couple of years since I made anything out of zorst choob. I'm so used to using stainless if I had to make a pipe for a bike or a car I think I'd just use 304...

I think one of the few places I found that had the donuts was in Welly. Likely the same guy.
There was a thread me and Grumph posted in about them but I can't recall where it was (it might even have been this one)
I think the thread was someone looking for stainless bends and MS donuts
Stainless is for pussies, my Berg pipe is made of Inconel and Ti and CF hangers. I would hate to think what it cost.

[Ocean1]

I think one of the few places I found that had the donuts was in Welly. Likely the same guy.
There was a thread me and Grumph posted in about them but I can't recall where it was (it might even have been this one)
I think the thread was someone looking for stainless bends and MS donuts

Interesting story behind those donuts. The guy worked for Southwards, developed the procedure for making donuts there and tried to get them interested in making them commercially. They weren't interested, and several years later he started a business making them at home. He eventually progressed to a small workshop in Naenae, he's still there but while I think he's done OK out of them he's cartainly not there full time nowadays.

Don't think I've ever really needed stainless donuts, you can get pretty tight 90* and 180* bends off the shelf, made out Porirua way.

[husaberg]

Interesting story behind those donuts. The guy worked for Southwards, developed the procedure for making donuts there and tried to get them interested in making them commercially. They weren't interested, and several years later he started a business making them at home. He eventually progressed to a small workshop in Naenae, he's still there but while I think he's done OK out of them he's cartainly not there full time nowadays.

Don't think I've ever really needed stainless donuts, you can get pretty tight 90* and 180* bends off the shelf, made out Porirua way.

The dairy shed dudes have tight bends in SS in suitable sizes not sure of the grade though. I think it might be a bit brittle.
Pretty much the same thing happened with the guy that did the BSL (Bill Buckley)he used to work for a small government offshoot of the DSIR the government wasn't interested he brought them out and makes robots that make silicon chips and other precision stuff ands sends them all around the world.
Makes millions and spends it locally.

[Ocean1]

Stainless is for pussies, my Berg pipe is made of Inconel and Ti and CF hangers. I would hate to think what it cost.

So's the SDR. The 525 is stainless though. And I didn't make either, but if I was making one I'd uses stainless simply 'cause it's what I can get and it's what I've got experience with.

[Ocean1]

The dairy shed dudes have tight bends in SS in suitable sizes not sure of the grade though. I think it might be a bit brittle.

316. Most food grade process tube is, but you can get 304 in the same range of sizes/radii.

304 is less prone to work hardening, but you've still got to be a bit sensible with changes in cross section and with support.

[Madness]

Anyone know a good source for exhaust parts? off the shelf tube bends, weld flanges/fittings, mufflers (complete or as parts); one to do for the bike, one for the car.

http://www.chase.co.nz/