Exhaust - "Got a light?"

Note: the above comment refers to the over-fueling tendency of carburetted rotaries on over-run, and the rather large flames they produce.

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The exhaust consists of a standard set of Genie 1 3/4" extractors that run 2/3 of the length of the car before joining just before the rear cross-member into a single 2 1/2" piece.  This then continues backwards under the CV's and up into a Genie turbo (non-reverse flow) muffler before exiting the car.

A couple of things to note:

• The cross-member restricts the size of the pipe leading into the muffler.  You can either rework the cross-member hole (lots of work) or find a 180B cross-member that has a slightly larger hole.
• There is a protective plate welded to the exhaust where it turns backwards after exiting the engine bay.  Without this the pipes would have been flattened long ago.
• There is a spark arrestor clamped to the tail-pipe that is a requirement on several of the "drier" courses. This consists of relatively thick steel mesh (anything else gets burnt away).  The other option here is a reverse flow muffler, however rotaries tend to blow the backs out of these.
• The Genie turbo muffler has been repacked with steel wool (rather than the more common fibreglass).  Due to the exit temperatures of rotary exhausts, the fibreglass would just melt and get thrown out.
• It will be necessary to replace the pipe work of the exhaust every season or sooner.  The hammering that the exhaust receives under the car is quite severe and the crushed pipes restrict engine power and torque.

Note that you can reduce the length of the primaries to increase bottom-end torque, however this is a trade-off with top-end power.  We think that the current primary run to the cross-member may be slightly to long, however as yet we haven't shortened this.

This is a (bad) picture of the exhaust extractor guard.  It's actually a steel plate welded onto the exhaust itself.  Crude, but effective.  It has certainly saved these pipes from an untimely death at the hands of some boulder or unseen ant-hill...