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assassin
Joined: 27 Jun 2004
Posts: 1105
Location: SunshineCoast
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I learnt CAD designing that bot. With that shell and similar designs, I break it down into multiple pieces and then create an assembly. The angle of the edges of the the pieces are not chamfered, there @ right angles(square, 90 degress, normal). Then the corrected edge is mated. Yes, this leaves a gap. But in real life, this is where a have filled the gap with a weld. Also if this mate is to be bent(not welded), the mate is also the correct place to bend the part.
Make sense? Sorry I've been drinking. hehe
But wait I guess theres more... um
To make the correct shapes/dimensions in the first place. Start by creating one part and maybe start measurements/sketches from that part in place for the next. Make sense? View from the top and the side/front, and get the shape correct. Theres lots of ways, which I think is cool and I haven't done enough to get down the best/easiest procedures.
Carve away _________________ Imagination is more important than knowledge. Knowledge is limited. Imagination encircles the world.
Albert Einstein.
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Fri May 22, 2009 7:10 pm |
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Spockie-Tech
Site Admin
Joined: 31 May 2004
Posts: 3160
Location: Melbourne, Australia
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Equal length extractors are supposedly old hat these days.. The trick is getting equal *flow*.
If a front pipe is smooth, but the rear pipe has 4 bends in it to make it equal length, chances are the gas flow speeds will put the pulses out of sync.
plus, afaik, equal length pipes only work effectively over a narrow rpm range where the pulses all arrive at the collector at the right time to create a (relative) vacuum in the next pipe/cylinder to exhaust.
Supposedly for a wider, less peaky power band more suited to wide rpm street use, the Tri-Y design is better than equal length. Equal length is a Nascar thing where the RPM's stay fairly constant for most of the time.
Of course if you're going to hang a muffler on the back anyway, most of the tuned effect is lost in the restriction, but every little bit helps, and pipes look funky
Nice Cad though _________________ Great minds discuss ideas. Average minds discuss events. Small minds discuss people
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Thu Aug 13, 2009 2:24 am |
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