REFLECTOR:Exhuast systems

[John Dibble]

Do the prop stains indicate inadequate mixture leaning?

John

Jim Agnew wrote:

> Scott,
>
> Without slip joints you will almost always get cracking
> because each cylinder is expanding at a different rate due
> to uneven heating.  As far as no stains on the prop, I have
> two to one on my IO-360 rear facing except that the rear
> end of the pipe has a 90 degree elbow which has been milled
> off flush with the bottom of the pipe leaving a large oval
> hole with a tip down end.  This mixes the exhaust with the
> air passing around the fairing and turns it down slightly.
> At most after several hours I get a slight haze on the prop
> that just wipes off.  I can send you a picture directly if
> you like.
>
> Jim
>