When each cylinder of a multi-cylinder gets it's own runner and there are no cross connections (like everything TJB Customs sells) I call them zoomies because that's what drag racers call them. I get the advantages, they flow better than a stock system and make a bike louder. I'm all for louder because loud pipes are a safety feature in that they cause helmet laws and I really love that. But back to zoomies! In the book Scientific Design of Exhaust and Intake Systems by Philip H. Smith, it is revealed that joining cylinders in the exhaust system, for instance a 2 into 1 system for the VLX 600 or an actual header with a collector on the Honda CB 750, the engine will make far more torque in the mid-range except in supercharged engines. On the street, more mid-range torque means the bike is more fun to drive. This is why some older stock Sporsters had a cross over pipe connecting the front to the rear cylinders. It certinly wasn't to make a Sportster quieter, it was to make it more driveable. It is true that at wide open throttle at the peak of the horsepower curve, you might make a few percent more power, but this is peaky horsepower that's mostly a factor on the dragstrip. The other thing is that zoomies are cheaper to manufacture. So why the zoomies? Am I missing something?
Search
Forum statistics
- Page views (24h):
- 841
- Page views (30d):
- 18,226
- Topics:
- 673
- Posts:
- 2,019
- Members:
- 1,186
