REFLECTOR:exhaust system, my solution

Jim Agnew reflector@tvbf.org
Sat, 12 Jul 2003 14:54:29 -0700 (PDT)


Actually Don #2 is wrong, 

2) 6 individual pipes minimize exhaust back pressure to
give best breathing for each cylinder. 

Properly designed headers actually lower back pressure
since each exhaust pulse helps to scavenge the next
cylinder by creating a vacuum in the pipe.

Jim

--- Don19dw@aol.com wrote:
>  See photos at "photos.yahoo.com/n19dw", click on
> "Velocity" folder, then on 
> each picture to enlarge. 
> System is 3 individual pipes on each side that direct
> exhaust down, then bend 
> 45degrees up to exit cowl in an aft direction. Each pipe
> is one piece rigid 
> with no slip joints, springs or supports, but each has a
> safety cable. Pipe 
> lengths are from 10 inches long to maximum 20 inches,
> minimizing heat expelled 
> inside cowling. 
> Advantages:
> 1) No hot pipes in fwd section of cowl and therefore no
> possible breaking 
> pipes and fire in fwd cowl.
> 2) 6 individual pipes minimize exhaust back pressure to
> give best breathing 
> for each cylinder. 
> 3) Closest pipe exit to MT prop blade is 15 1/2 inches
> which produces almost 
> no deposit on cowl and very slight glaze on prop.(See
> photo 6) Note: crankcase 
> breather exit tube clamped to right fwd exhaust pipe.
> Don't have to worry 
> about that tube freezing. 
> So far 43 hrs on this system with no problems or cracks. 
> Don White   N19DW   XL/RG 
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=====
James F. Agnew
Jim_Agnew_2@Yahoo.Com
Tampa, FL
Velocity 173 Elite Aircraft Completed