Exhaust Systems

Whitby delivered most of the boats with a standpipe exhaust system but most boats have since replaced these with a waterlift muffler. Here's a piping arrangement for the Atomic 4 with the waterlift muffler in the port sail locker.

(Full-size pdf also available.)

Note: Since drawing this, I've made a mixing pipe using a Groco hose barb (1-1/4" thread to 1-1/2" hose). I drilled an angled hole which I tapped for a 3/8" pipe nipple. This avoided brazing.

Also, I put everything together with pipe dope to avoid leaks.

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