Exhausts

I was thinking about the exhaust and how i could go about making it. I thought that it would work if i could make an all in one unit so have the cat and the muffler in the one cannister. One option would be to find a motorbike exhaust and then weld on the cat to the front of it. Then wrap a perforated heatshield around to make it tidier.

Roughly what id like to have as the heat shield. But with larger holes, and more of a mesh type arrangement. Should keep everything cooler too with more ventilation.

This is an actual Caterham exhaust. It's combined with a cat at the front and the muffler at the rear.

Here's an idea from a guy on the Oz-Clubbies forum. Showing a Yamaha R1 titanium/carbon exhaust. This one has been gutted to just be a hot dog style muffler.

So the theory behind extractors is that they all have to be the same length runner into the collector to ensure that the pulses of exhaust gas helps scavenge the next pulse. So each pulse (as its each cylinder creates a small amount of exhaust per each exhaust cycle) is a high pressure charge. At the beginning and end of this charge is actually a low pressure. This low pressure is what helps the scavenging effect of the exhaust. So each runner must be tuned to ensure that a pulse of exhaust is scavenged by the one in front. I'm not very good at this sort of fabrication, so i may have to send the car out once the engine is mounted correctly in the frame and get someone to do it.