REFLECTOR:TUNE, STRAIGHT EXHAUST PIPES

[Pat Shea]

Jim,

What you would NEVER do is exactly what most, if not
all, of the XL drivers are doing. Virtually all of the
pipes (factory stacks, 3-into-1 Y stacks, 6 separate
pipes...) for the for the lyc or cont 6 cylinders exit
down out the bottom cowl. No vibrations reported. As
has been previously discussed, the guy who had the two
3-into-1 stacks running out the back couldn't get them
to work w/ 6 cyl lyc and a three blade prop - heat
damage to the prop. 

Pat
 
--- Jim Sower <canarder@frontiernet.net> wrote:
> Tom,
> By straight "tuned" exhaust pipes do you mean
> sticking straight
> out the cowl?  I saw pictures of a Velocity with
> what appeared
> to be a pipe from a 3-into-1 header sticking
> straight out of the
> cowl.  I would NEVER do that.  Exhaust exiting the
> airplane that
> way creates "rooster tail" drag that is the rough
> equivalent of
> having the pipe sticking out a foot or two from the
> airplane.
> That's a LOT of drag.  I would be inclined to find
> out if the
> guy who made the 3-into-1 pipes that went out the
> back still had
> his jigs and get some of those.  Shirl Dickey went
> NUTS for over
> a year trying to track down some hideous vibration
> in his
> E-Racer and found out it was exhaust pulses from the
> stub pipes
> from his V-8 routed straight through the cowl going
> through the
> prop.




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