REFLECTOR: Exhaust systems

Mike Pollock reflector@tvbf.org
Thu, 10 Jul 2003 19:45:38 -0500


We are using the standard exhaust headers that velocity supplied with the
173RG back in 1993.  We cut off about 4" of the pipes at the rear to make
them flush with our header exits.

Mike

-----Original Message-----
From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
Behalf Of Scott Derrick
Sent: Thursday, July 10, 2003 8:29 AM
To: reflector@tvbf.org
Subject: Re: REFLECTOR: Exhaust systems


Mike,

How far from your exhaust exit and the prop.  Also how wide(far apart)
are the stacks?  I would think keeping both theses distances at a
maximum would minimize the heat problem.

Scott


Mike Pollock wrote:
> The best way not to cook your prop is to get it further away from the
> exhaust.  This can be done with a longer extension or changing where the
> exhaust is dumped out.  We chose the longer 8" extension and we have never
> burned a prop.  We do have a little soot, but no burns in 620 hours with
an
> IO-360 with 3-blade Performance propeller.
>
> I guess some are lucky and some are not.
>
> Mike
>
> -----Original Message-----
> From: reflector-admin@tvbf.org [mailto:reflector-admin@tvbf.org]On
> Behalf Of Ronnie Brown
> Sent: Wednesday, July 09, 2003 7:12 PM
> To: reflector@tvbf.org
> Subject: Re: REFLECTOR: Exhaust systems
>
>
> Not only true with the M/T but also any three bladed prop.  No way to
clock
> it such that it misses the exhaust, even for 4 cylinder IO 360's.  No
> pictures but I saw with my two beady little eyes a Velocity and a Cozy,
both
> with 360's, both with Performance props, both had charred spots on one
blade
> of the prop, looked like a wooden match that had burned, then
extinguished.
> Not pretty.  The Velocity prop was returned to Clark, he pronounced it
dead
> and unusable.  A two blade can be turned such that it misses, but as
someone
> mentioned, there are only two positions that a three blade can be
installed,
> both incur the wrath of the 1400 degree exhaust.
>
> I have a three blade Catto and forward exit exhausts.  No soot on the prop
> but some on the cowl.
>
> Ronnie Brown
> 173 Elite RG 55 hours
>
>
> ----- Original Message -----
> From: "Tom Martino" <tmartino@troubleshooter.com>
> To: <reflector@tvbf.org>
> Sent: Wednesday, July 09, 2003 4:01 PM
> Subject: RE: REFLECTOR: Exhaust systems
>
>
> | So is the conclusion truly that we cannot have a dual rear exiting
exhaust
> system with an MT prop because it will damage the blades?  That is a major
> disappointment.
> |
> | -----Original Message-----
> | From: Pat Shea [mailto:xl340hp@yahoo.com]
> | Sent: Wed 7/9/2003 1:45 PM
> | To: reflector@tvbf.org
> | Cc:
> | Subject: Re: REFLECTOR: Exhaust systems
> |
> |
> |
> | --- Jim Agnew <jim_agnew_2@yahoo.com> wrote:
> | > All of this talk about cooking props yet I have not
> | > seen any pictures of a charred or burning prop.
> | This
> | > sounds a lot like an urban legend.  Does anyone have
> | > some pictures?
> | >
> | > Jim
> |
> | No pics but...
> |
> | Rodney Brim and the late Steve Drybread made a
> | serious attempt at a rear exiting exhaust for Rodney's
> | XL (IO-540 w/ 3 blade MT and I think one EI). They
> | tried many different configurations (pipes exiting out
> | the existing cowl openings, pipes exiting back thru
> | lower & outboard openings, pipe tips turned out...)
> | but were unable to prevent the exhaust from damaging
> | the blades. Steve did have success getting a similar
> | engine/exhaust combination to work on the Berkut, but
> | since they run a 2 blade fixed pitch prop there are
> | multiple clocking positions. There are only two
> | positions for clocking the MT on this motor.
> | Also, Scott Swing briefly tried a Berkut style rear
> | exiting exhaust on the XL prototype (IO-540 w/ 3 blade
> | MT) and blistered the prop.
> |
> | Pat
> |
> |
> |
> |
> |
> |
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>
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