As Bobby stated –  I used the stock manifold cut at about 45 deg. down into a 4 inch horizontal swirl  pipe.   I was able to use a Hush Power muffler attached to the swirl pipe inside the cowl.   Real quiet exhaust – even after the muffler lost all inside material.

The system was planed to be a first attempt at an exhaust.  After about 4-500 hours it started developing cracks.

At about 650 hours, I built a complete new exhaust using an after market manifold flange and stainless tubing from Burns.  Now I have a muffler hanging under the floor and slightly louder exhaust.  This design used tuned lengths of SS tubing for each exhaust port all exiting toward the rear and merged into a 3 to 1 collector.

Dennis Haverlah

Sent from Mail for Windows 10

Neil,

This was my first system using a cut down renesis manifold. Dennis used a tangential swirl can instead of a bend to turn the pipe back towards the firewall.

Bobby

-----Original Message-----

From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]

Sent: Friday, January 04, 2019 4:22 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] exhaust manifold

Havbe the stock manifold in my hot hands and Steve Izett may well be

right.  Just hacksaw the cast flange off ,reverse it and re-weld it. 

How did you blokes do it??  Neil.

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