Ducati 1000 DS custom build

[Darren69]

Shorter exhaust tend to rob torque esp. from a v twin. Which is why Termi full systems have all those spaghetti manifolds to maintain and improve gas flow using negative pressure created by the other cylinder. And it works 10% more torque/power on an S4 with nothing more than the exhaust. You can feel the torque come onto the pipe in a similar way to 2 stroke expansion chambers.

[buzzer]

Originally Posted by Darren69

Shorter exhaust tend to rob torque esp. from a v twin. Which is why Termi full systems have all those spaghetti manifolds to maintain and improve gas flow using negative pressure created by the other cylinder. And it works 10% more torque/power on an S4 with nothing more than the exhaust. You can feel the torque come onto the pipe in a similar way to 2 stroke expansion chambers.

spot on... Lets see how it goes... i do expect to lose some performance... but these days its faster anyway than i can think!


Apart from a polish the exhaust is welded up and finished. I didn’t want to have distortion and burn through when attaching the baffles, so for these I used TIG braze which worked quite well.

The slip joints are held together with springs and to hold these I needed to make some spring hoops. These are actual quite difficult to make to get the bend just right and to a consistent shape. I made a little jig to make these.

[900Rebuilder]

Originally Posted by Darren69

Shorter exhaust tend to rob torque esp. from a v twin. Which is why Termi full systems have all those spaghetti manifolds to maintain and improve gas flow using negative pressure created by the other cylinder. And it works 10% more torque/power on an S4 with nothing more than the exhaust. You can feel the torque come onto the pipe in a similar way to 2 stroke expansion chambers.

I've opted for Silmotor 45mm headers on my 900 as I am hoping for the same or similar results to what you have described coupled with 2/3 length open cans, open top airbox (mwr) and some flatslides.

Not a question on the build quality or skills on show here but those style exhausts are not for me including those which RoadRacing sold back in the day.

Interesting build