All Things Mk5 > Members Rides
APR/Race Developments Stage 4+ 700hp+ TTRS Build
Andy:
Its welded instead of bent, as bends decrease the diameter of the pipework apparently.
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thought mandrel bendind on the exhaust kept the same diameter :surprised:
beat to it :signLOL:
Poverty:
Wonder if its different for Ti? I was just told the bends where lasercut and then re-welded, instead of mandrel bent, its because mandrel bends reduce the diameter of the piperwork and add extra friction/resistance
More info on the workmanship from what my friend tells me who has some experience in this sort of thing:
A shop bender will crush the pipe to form that kind of elbow on Ti on the backbox.
With laser machines the cuts will roll to a nigh on perfect diameter, then tack them up and the bend will form very well, in the hands of a skilled sheety.
The welds will be done from the outside only, with a purge gas inside the pipe to stop oxidation and keep the weld pool stable. This also means a single pass, almost 'fuse' weld run that minimises distortion and results in a smooth inner joint surface, plus a luvlly jubbly exterior weld pattern.
rich83:
--- Quote from: Poverty on November 14, 2012, 12:05:11 am ---Wonder if its different for Ti? I was just told the bends where lasercut and then re-welded, instead of mandrel bent, its because mandrel bends reduce the diameter of the piperwork and add extra friction/resistance
More info on the workmanship from what my friend tells me who has some experience in this sort of thing:
A shop bender will crush the pipe to form that kind of elbow on Ti on the backbox.
With laser machines the cuts will roll to a nigh on perfect diameter, then tack them up and the bend will form very well, in the hands of a skilled sheety.
The welds will be done from the outside only, with a purge gas inside the pipe to stop oxidation and keep the weld pool stable. This also means a single pass, almost 'fuse' weld run that minimises distortion and results in a smooth inner joint surface, plus a luvlly jubbly exterior weld pattern.
--- End quote ---
Yeah.. thats what you REALLY dont want, as it almost halves the diameter on a 90degree bend.
What you get with mandrel bending is a variation in the wall thickness of the tubing.
Poverty:
Im glad you guys know about this stuff as I sure dont :signLOL:
Learnt so many new things as I go along with this project
Cupra R:
--- Quote from: Poverty on November 13, 2012, 10:18:14 pm ---
--- Quote from: Cupra R on November 13, 2012, 08:17:40 pm ---Jase
What did you do with your std calipers?
You fancy selling them?
--- End quote ---
Sold them a while ago! My mate will have his up for sale not too long from now though, i'll keep you in mind when he does :happy2:
--- End quote ---
Cheers jase.
Tell him he needs to upgrade his sooner rather than later :signLOL:
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