Engine specs & exhaust designs

[IndyRV6]

Does anyone happen to know the valve lift and duration plus the rocker arm ratio for a lycoming 360?


Here is a good article on exhaust designs from the cycle/automotive world ...

http://www.rbracing-rsr.com/exhausttech.htm

Thanks..
Rick Smith
IndyRV6
Oxnard, CA

[gmcjetpilot]

Those are sexy curves, the exhaust pipes ain't bad either.

Here two great reports/ article on exhaust for aircraft by cafe foundation dot org.:


http://cafefoundation.org/pdf/EPG%20PART%20IV.pdf
http://cafefoundation.org/pdf/epg.pdf

This is what they list for cam (see reports for graph):

Mooney N6057Q Lycoming 10-360 A1 B6 engine firing order: 1324
Valve Timing:
EVO 57 BBC/Lift = .170? @24 BBC.
EVC 26 ATDC/Lift = .060? @ TDC/Lift = .180? @20 BTDC
IVO i8 BTDC/Lift = .050? TDC/Lift = .170? 20 ATDC
(Note: Cams are optimized for reliability and tractability, not optimized for tuned exhaust. Clearly greater durations, lifts and overlap would improve and take advantage of performance potential of tuned exhaust.)

Here are the general engine specs:
360 cu-in,
2700 rpm max
2200-2700 rpm usable
5.125 x 4.375 / bore x stroke
Compression 8.5:1CR (180HP) or 8.7:1CR (200HP)

Ideal primary secondary collector header (4-into-1) for a 4 banger Lyc

-Primary 32-38" long x 1.75" dia (keep lengths equal as best possible)

-Secondary 28"-36" long x 2.25" dia (10"-40" range length usable, 19.5" tested) Shorter lengths such as 19.5" or shorter work, but not optimized; however practical aspects of the installation make a compromise a good trade off for external drag, since the primary is hanging out in the breeze.

My pipes: