Post by 190mech on Jun 20, 2011 20:59:21 GMT -5
Thought I'd show y'all a bit on building one of my 90+ pipes.It all started when I could not find a good pipe on the market for a "Big Block"air cooled Mina.I tried a lot of designs(even a "slipper pipe" to adjust length while riding).This is my latest and seems to work pretty well on the few machines its run on.
The pipe cone layouts are transfered to DXF files and cut on our CNC plasma cutter;
All of the parts are cleaned ,rolled ,and welded;
Then they are checked for roundness and welded as sub assemblies;
A pipe flange and mount bracket are CNC cut and fitted to a core engine for jigging of the new pipe;
All of the sub assembly parts are carefully tack welded together,checking for proper fit;
The stinger is fitted and tacked,then the long task of modifying a production muffler can.The inner core diameters are waaay too small for a good pipe,so a new one must be fabricated(about 4mm larger than the stinger),the can ends must be machined for the larger diameter also.As many of you know,I hate muffler can mods and dream to find the proper part ready made one day..Can is fitted to the pipe and CNC adapter flange is tacked into place.
If it all looks good the whole pipe is welded up.
Its real ugly after that!I use Permatex Rust Dissolver Gel,a scotchbrite pad and hot water to get it clean,then dry and heat up the pipe and apply 2 coats of Mop-N-Glo floor polish(No Kidding!) and this is what it looks like;
Then its mounted on my "Testbed 103"to check fit and power output;
It takes 20+ hours to complete a pipe,but its well worth it when the throttle is twisted!
The pipe cone layouts are transfered to DXF files and cut on our CNC plasma cutter;
All of the parts are cleaned ,rolled ,and welded;
Then they are checked for roundness and welded as sub assemblies;
A pipe flange and mount bracket are CNC cut and fitted to a core engine for jigging of the new pipe;
All of the sub assembly parts are carefully tack welded together,checking for proper fit;
The stinger is fitted and tacked,then the long task of modifying a production muffler can.The inner core diameters are waaay too small for a good pipe,so a new one must be fabricated(about 4mm larger than the stinger),the can ends must be machined for the larger diameter also.As many of you know,I hate muffler can mods and dream to find the proper part ready made one day..Can is fitted to the pipe and CNC adapter flange is tacked into place.
If it all looks good the whole pipe is welded up.
Its real ugly after that!I use Permatex Rust Dissolver Gel,a scotchbrite pad and hot water to get it clean,then dry and heat up the pipe and apply 2 coats of Mop-N-Glo floor polish(No Kidding!) and this is what it looks like;
Then its mounted on my "Testbed 103"to check fit and power output;
It takes 20+ hours to complete a pipe,but its well worth it when the throttle is twisted!
