Powerflow Tuned Exaust

Powerflow Tuned Exaust

Has anyone had any experience with the Powerflow tuned exaust.
Does it really deliver?  If it really does deliver 20 more horsepower to the 0-320 engine shouldn't the gross weight limit increase?

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Re: Powerflow Tuned Exaust

I installed a powerflow system on my 1968 172 (0320E2D) 150 hp about 150 hours ago.  It does everything they say it does!  My ground roll is shorter, climbs much better and pulls about 100rpm more on the static runup.  I have no complaints and much praise in general for this product.  As for the weight, they may not have chosen to bother changing that in order to make the STC approval easier...I don't know.
   Sound level is about the same, although the tone is different (lower).  I  can now pull redline in cruise and could not before. 
   On the early lycoming models (like mine) the hole at the bottom of the cowl is large and the support rod clears directly to the muffler.  On later models a 1" hole must be cut in the lower edge of the cowl for the support rod.  Otherwise the install is easy bolt on.  Besides my gps this is the best money i have spent on my airplane.

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Re: Powerflow Tuned Exaust

Randy,

Steve is not the only one who swears by Powerflow.  There is a lot of controversy on this forum regarding the modification.  Do a search on Powerflow and see all the old posts.

Based on Steve's experience and the information below the increase is about 10 hp (if his propeller is anything like the one in the information below).

In estimating the increased horsepower by adding a Powerflow exhaust  without going through a science project.  Here’s some additional information regarding a “gross” approximation of power increase.  I wrote an e-mail to McCauley’s technical department to ask how to correlate develop horsepower increase to an increase in RPM on a static run-up.  Here’s what I told them and their response.  The answer would be sensitive to density altitude so I would suggest they gave the information based on a standard day at sea-level.  Understand that the information is very rough..

“I have a C172M 150 hp engine with a 75" McCauley Prop and 53" pitch. I contacted McCauley to get some technical information regarding developed Horsepower versus RPM. They responded with the usual proprietary information jazz and too many variables to consider. So I tried again explaining what we are trying to do. The response is below:


'Barry,

There are way to many variables to put the kind of information you are looking for into a chart. However, as a rough estimate you can use 10rpm=1hp. So if you saw the rpm go from 2500 to 2575, a difference of 75rpm, hp increased by approximately 7.5.

Sincerely,
Dale W. Snyder
Service Engineer
McCauley Propeller Systems
3535 McCauley Drive
Vandalia, Ohio 45377
Phone: 937.264.2594
Fax: 316.206.9916'”

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Re: Powerflow Tuned Exaust

Randy,

I love my powerflow.  I combined it with the PennYan 180hp upgrade on my 1979 172.  It runs great and I cannot say enough.

Rich

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Re: Powerflow Tuned Exaust

I ran air tours in a Superhawk with the powerflow and the plane performed great, even full! 

I'm not sure you get much extra power but we definitely got over 100 static rpm which allowed the prop to spin up quicker...  thats where we got shorter ground roll and better rate of climb.  We also burned less fuel...

I liked it so much i recommended it to my friends who put it on a Penn Yann 180 skyhawk and a Grumman Tiger... both had great results and swear by it.


-Kurt

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Re: Powerflow Tuned Exaust

I tried to buy one but they don't make them for the 0300D sad

Tony
C-GICE

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Re: Powerflow Tuned Exaust

The Powerflow system is excellent. I've writen pages in these forums, it is quieter and directs the sound back - If you fly out of anywhere that is sound sensative this makes a big difference. Regardless of how you calc it there are not many products that give you a good increase in HP or static RPM at the propeller - the measure of the real available power.
It's on my 172K.

Ken

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Re: Powerflow Tuned Exaust

I too have heard (and experienced) good things with the powerflow.  However, caveat emptor!  I attempted to install one on my 1964 c172 which as an avcon conversion.  Not a good experience.  Though listed on the website, the conversion didn't fit.  they offered to do some custom engineering for me at $200 per hour to get the FAA to allow substituting some of the parts from the cherokee kit (the muffler needed to be lowered about 3 inches to clear the bottom of the gascolator on my aircraft and the muffler pipe from a cherokee did the trick) so it would work on my aircraft.  The manager of the company was pretty clear that he believed it was up to the aircraft owner to make things fit, and that though the website advertised it as fitting, it might not necessarily be so.  I declined the offer to pay for product development and certification, and regretfully returned the kit.

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Re: Powerflow Tuned Exaust

I have a PowerFlow exhaust on my 1977 C172N.  I bought it with the exhaust already installed, but it seems to work as advertised.  During the pre-purchase "test drive", I loaded the plane to gross on a hot day (density altitude was 2700' at a 531' airport elevation).  The plane climbed out at 1000-1200 fpm.  After I bought the plane, I added another 2" of prop pitch and still get 1000-1200 fpm at full gross.

I have installed an E.I. 16 channel digital engine monitor and I can say that CHT never exceeds 379 on the hottest cylinder, and oil temp stays below 194.  The exhaust is noticeably quieter and the exhaust pulses are "smoother".  Following PowerFlow's advice, I always run the throttle fully open, and lean out the mixture until I get 2400 rpm.

Alameda Aeroclub out in San Francisco has years of experience with the PowerFlow. Every one of their seven Cessnas has the PowerFlow exhaust and they highly recommend the mod.

A note about the gross weight "increase".  There is an STC for 172N's that allows for an increase of 100 lbs., but it's related to engine oil cooling, not the exhaust. Apparently, in the C172, the limiting factor to gross weight is oil cooling.  I have the STC and purchased it from PowerFlow.

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Re: Powerflow Tuned Exaust

I had spoken to the Powerflow people regarding the concern around "cooling".  The explanation I got was as follows. I am paraphrasing and adding some conclusions.  There is a reduction in cooling air flow through the cowling when the plane is in a climb attitude.  This is caused by the installation of the powerflow exhaust.  The installation results in leaving a wider annular gap around the narrower exhaust pipe exiting the cowling.  The reduced cooling results from the outside air getting into underside and behind the engine.  The air inflow causes an increasing backpressure thereby reducing airflow around the cylinders and apparently, based on Mark's post, reduces the flow through the the oil cooler.  My contention is that the increased oil temperature is due to an increased engine operating temperature in a climb.  The increased temperature is due to a reduction in cooling flow and increased power.  During a climb, you run with the mixture rich.  The benefit of the tuned exhaust is to improve power.  Increasing power with a rich mixture will result in higher operating temperatures.  This is exascerbated by the reduced air flow.  The oil increased oil temperature is a result of the decreased engine cooling.

Never fear, though, they will sell you an "option" for a few hundred dollars that closes the gap that the exhaust caused! This "option" improves the appearance of the cowling and more importantly, improves the cooling of the engine in a climb.

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Re: Powerflow Tuned Exaust

I think I mis-spoke.  The option really blocks the air from going into the anular gap by diverting /shielding it, rather then closing the gap.

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Re: Powerflow Tuned Exaust

has anyone noticed  a reduction of fuelburn with Powerflow Exhaust?

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Re: Powerflow Tuned Exaust

I have a 1976 FG Cardinal with 180 hp and constant speed prop.
I only have about 4 hours since installation of the Powerflow, but at 75 degrees rich of peak, my new fuell burn in about 11.3 gph.  Previously, it was 10.2gph.  This is at 6,000'.

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Re: Powerflow Tuned Exaust

I am very impressed with the performance of my 172M since the installation of the Powerflow exhaust, but since it was done at the same time as a major OH w/ Millennium cylinders I can't give any specific credit to just the exhaust.

My fuel burn seems to be the same as before, 8- 8.3 GPH at 75% power (2550 RPM).

One Sunday afternoon I was flying at reduced power for a couple hours as I was in no hurry to get anywhere, and my fuel burn was less than 5 GPH!

I let a friend fly my plane from his strip so I could listen from the ground and I believe it is a lot noisier from the ground, especially from behind the aircraft. Another time I met a friend for dinner and he said when I left and flew over the town it sounded like a dragster "on the pipes" overhead.

Yeah, some think the exhaust is ugly. But to me it looks like the exhaust on a Caravan, the single engine Cessna of my dreams that  I'll buy when I win the Lotto.

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Re: Powerflow Tuned Exaust

You mean you burn more fuel now with the Powerflow installed
then before (ie 11.3 gal vs 10.2 before???)

Pls clarify.
thanks

Werner

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Re: Powerflow Tuned Exaust

I am looking at a 1977 172XP. I think it has a 210 horse continetal. Does anyone know if there is a powerflow for this airplane? If so does it help?

Thanks,

Charles

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Re: Powerflow Tuned Exaust

Randy:
I put a power flow uniot on my 1979 Skyhawk II C172N with the H engine. Been very satisfied with the performance. I rate it equal to the 172 S

I asked about the an gross weight increase, and Power flow did sell an STC to increase gross weight by 100 lbs. It does not come with the power flow automatically.

Dave

Dave Horner
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Re: Powerflow Tuned Exaust

I HAVE HEARD THAT THE POWERFLOW DOES'NT WORK AS WELL ON THE 0360 AS ON THE 0320. ANY ONE KNOW ABOUT THIS.

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Re: Powerflow Tuned Exaust

I have a C-172 M-Model and am thinking about upgrading my engine to Penn Yan Aero O360-A4M.  I currently have powerflow on my cessna and was wondering if anyone had done the same type of upgrade and if you had to do any modifications on the powerflow?  Any info will help? 
Thanks
Matthias from Santa Barbara

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Re: Powerflow Tuned Exaust

I have heard that the new short model of the powerflow isn't as good as the older longer version. Also not as quiet. I havebeen considering putting it on my 172M 150MP 0320E. I am doing the 160HP STC at TBO this month.

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Re: Powerflow Tuned Exaust

HaS ANYONE HAD A EXPERIENCE WIHT POWER FLOW WITH A CESSNA 177 ?
I' fly in Italy a Cessna 177 RG with a engine IO 360  rebuild and with 165 ours since new
The plane flies very well but the oil temperature is always  high very near the red line during the climb with full trottle and rich
Can the powerflow help to solve the problem or it will make worst ?
can someone give me a answer because in Italy none knows about this kit
Carlo

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Re: Powerflow Tuned Exaust

In Power Flow's experiences with the over 60 Cardinal RG’s currently flying we have not experienced any complaints about higher temperatures.  In fact, in most cases, the Cylinder head temperatures go down, in effect leading to cooler oil temperatures.  If you currently have an issue with excessive temperatures on climb out, the Power Flow may help that slightly, but it will not be a drastic change. 

Do you currently have an exhaust fairing around your tailpipe?  If not, you may want to consider an exhaust fairing made by Maple Leaf Aviation in Canada.  As stated on their website, the fairing helps reduce engine temperatures and decrease the turbulence around the exhaust pipe.  The main reason this occurs is because during steep climb out, hot air is forced to stay inside the engine compartment due to the pressure from the steep climb angle.  The fairing deflects the air away from the exhaust opening in the cowl allowing for more hot air to exit the cowl, thus providing better cooling.

All Power Flow products come with a 60 Day Money Back Guarantee, so if for some reason you did see a rise in temperatures, you can always send it back for a refund less the cost of shipping/installation.  Further to that, Power Flow has RISK FREE DEALERS, who have an agreement with the company to cover labor and shipping charges if a return is necessary.

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