PowerFlow is it worth it

[mike20papa]

The thing about the Power Flow exhaust is it looks like a "beat to fit" installation.  One of the additional features of owning an A model..is ...besides the termites..I get to fit the 180 hp with a cross over exhaust system that actually fits the air frame and the carb heat system as originally designed.  Until you've owned one, you never knew how simple the installation could be.  Power Flow compares their performance numbers to a "standard" system.  What does that mean.  Lycoming claims that a cross flow exhaust scavenges better than a "standard" exhaust.  The later model Mooney exhaust with the ribbed single muffler and single pipe is not a cross flow muffler and it is a "beat to fit" compared to the original dual muffler cross flow system.  

Acorn Exhaust Mooney Mark-20_20A.pdf

[rbridges]

17 hours ago, bonal said:

When I see PFM I think of the Italian progressive rock band from the 1970"s

major thread derail, but...

 

when I see PFM, I see porcelain fused to metal crown (I'm a dentist).

[N9201A]

Additional new fact: Spoke to Jim Shafer at OSH. He explained that reduced back pressure should reduce CHT. Thinking it through, the increased CHTs I experienced could have been the result of less cooling airflow because of higher deck angle at the same climb speed.

They collect data so I will share mine with them and perhaps they can publish all of the Mooney owner results they've received, and everyone can judge for themselves.

[BJM61]

We need a new exhuast the orginal 61' can no longer be repaired and are considering the PFE, my only concern is reducing or evening out the CHT's. During summer they can be as much as 75 degrees difference. Will this help? 

[cctsurf]

12 hours ago, BJM61 said:

We need a new exhuast the orginal 61' can no longer be repaired and are considering the PFE, my only concern is reducing or evening out the CHT's. During summer they can be as much as 75 degrees difference. Will this help? 

 

On 7/29/2016 at 7:49 AM, N9201A said:

Additional new fact: Spoke to Jim Shafer at OSH. He explained that reduced back pressure should reduce CHT. Thinking it through, the increased CHTs I experienced could have been the result of less cooling airflow because of higher deck angle at the same climb speed.

"the reduced back pressure should reduce CHT", the more even flow across the engine should even temperatures.  If you're looking at a significant difference across your cylinders, you should also check your baffling...

I say this as one who already has the PFE (apparently not PFM, wanted one of those, though too...), but has not yet had the additional AMUs to purchase an engine analyzer.

[mooniac15u]

12 hours ago, BJM61 said:

We need a new exhuast the orginal 61' can no longer be repaired and are considering the PFE, my only concern is reducing or evening out the CHT's. During summer they can be as much as 75 degrees difference. Will this help? 

Have you contacted Dawley Aviation? http://www.dawleyaviation.com/home.html

You might be surprised with what they can repair.

[BJM61]

Thanks guys I'll look into the repairs since we just spent money on avanioncs upgrade. and put off the new exhaust till next year while we build the funds again.

[carusoam]

Trying to get CHTs balanced is a challenge...

1) it takes Good balanced FF to each cylinder first. Balanced EGTs is important to this.  Tough to do when the carb is in charge of the distribution.  There is a lot to be learned regarding the carb, and it's two jets...  And when is a good time to have one OH'd.

2) uniform distribution of cooling air is next.  The dog house can be in tough shape with leaky holes and cracks or missing parts and seals...

3) achieving these with good, four cylinder, CHT and EGT data is a big challenge.  Doing it without an engine monitor is near impossible...

4) Doing it with MS, at least you can borrow somebody else's experience...

Best regards,

-a-