Bonanza Cooling Baffles

D'Shannon Aviation's custom Baffle Cooling Kits are designed to improve cowling air flow to properly cool your engine. D'Shannon Baffle Cooling Kits help avoid cylinder replacement and overall engine wear, saving you money.

  • Improved cooling supports reduced cylinder wear.
  • Our cooling kits are durable reducing yearly maintenance expense.
  • Multiple color combinations.

Your engine may be running extremely hot and you may not even know it. D'Shannon Aviation's custom Baffle Cooling Kits are designed to channel air flow through the cowling to properly cool your engine. D'Shannon Baffle Cooling Kits help avoid cylinder replacement by reducing valve, valve guide and overall engine wear. You'll improve engine safety while saving money and avoiding down time.

Cylinder replacement is one of the first topics to come up when pilots and mechanics talk about engine operation. Many pilots say they can't get all the horsepower out of their engines because of engine temperature issues.

Early cylinder failure and excessive operating temperatures are both symptoms of a mistreated engine.

Your airplane's engine requires adequate cooling to run properly.

Those little “waves” and wrinkles often found along the length of the seal strips on improperly maintained baffles are escape paths for air your engine needs for cooling. D'Shannon cooling baffles will force that air where it's needed most - around your cylinders.

Bryan Lewis, then President of Teledyne Continental Motors wrote in ABS Magazine: “The cooling baffles and seals of your engine compartment are responsible for removing a heat load that is equivalent to the horsepower supplied to your propeller. Any disruption of designed cooling airflow can be a problem for cylinder life and should be corrected."

What makes the D'Shannon Aviation Baffle Cooling Kit superior?

  • Our baffle cooling kit is complete. It replaces the entire Beech baffle installation, both the metal and rubber seals, along with the mounting brackets and hardware. Everything you need to protect your engine.
  • We went beyond FAA requirements and conducted flight-testing in actual 100-degree ambient temperatures. Using the worst possible conditions defined by FAR standards, we have obtained unquestionably the most accurate possible cooling test results and they prove the effectiveness of D'Shannon engine baffles.
  • D’ Shannon Products’ baffle cooling kits are flying on thousands of Beech Bonanzas. Owners report remarkable improvements in the temperature of their engines.
  • Our baffle kit is custom fit, so that every bit of air entering the engine compartment is used to its fullest potential to cool your engine.

Engine cooling takes place by routing air through the cylinder fins and around accessories and the oil cooler. Take a peek at your current baffles. Leaking baffles show up as gray streaks along the upper cowl doors and the lower cowl. How many ‘holes’ do you see, where air is escaping without cooling your engine?

Another test is to check the CHTs for all six cylinders. Don’t be misled by a single cylinder head temperature reading. You may be redlining one or more of your other cylinders. Our cooling baffle kits give results that can lead to longer cylinder life, reduced maintenance costs and the ability to climb quickly to a cooler altitude without overheating your engine or running excessively rich fuel mixtures to compensate for inadequate cooling in climb.

Excessive engine temperatures are the enemy of engine life and full-power operation. Cool your engine for safety, performance and reduced maintenance cost with D'Shannon Aviation Baffle Cooling Kit.

Canted IO-520, or IO-550: C33A, E33A, E33C, F33A, F33C, G33, S35, V35, V35A, V35B, V35TC, 36, A36, A36TC, B36TC, G36

Straight Mount IO-470C, IO-470N, IO-520 or IO-550: 33, A33, B33, C33, E33, F33, A35, B35, C35, D35, E35, F35, G35, H35, J35, K35, M35, N35, P35

Dear Scott:

I now have my aircraft back from Hampton Roads Helicopters with the D’Shannon Baffle Kit installed. I flew it back from Virginia today to my home airport, Easton, Maryland (ESN).

Nate Steigenga and his folks at HRH did a FABULOUS job. Apart from the attention to detail shown during the project, the performance of the kit vis-à-vis my engine/cylinder temps exceeded my wildest expectations. My number 6 would regularly bump above 400F on climb-out, even in relatively modest temperatures such as we had here today (roughly 55F).

During climb-out today, I could not get the number 6 cylinder to go above 315 – at full throttle! During cruise, I saw an across the board 70-80 degree drop in my normal cruise cylinder temps.

In short, I could not be more pleased.

Thanks for the great product and the equally great installer recommendation.

Robert Schulte
Schulte Booth, P.C.
3001 Elliott Street
Baltimore, Maryland 21224
Voice (410) 732-1315
Facsimile (410) 732-1316

Hi Scott,
Yesterday we took delivery of our E33 Bonanza after its engine upgrade to an IO-470-N using your STC. We are very pleased with the result, both the quality of the installation, and the performance. So far we have only flown it for two hours,however it is very pleasing not to have to worry about high cylinder head temps. With our original engine it was a struggle to keep them under 390 degrees, and now they are all in a flat line across our EDM-700 engine moniter at 330 degrees even with a tight new engine and a high power setting, so when the engine is broken in I am sure that we will be able to expect a long and trouble free life from it due to the vast improvement in engine cooling due to your baffle kit.Thank you and I will take some photos of the installation and send them to you.
David Headlam VH-DXH Australia

I recently had my engine rebuilt by Bill Cunningham @ Powermasters where a new D’Shannon baffle kit was installed during the rebuild.
just wanted to take a moment to let you know how happy we are with your system.
Our CHT temperatures have never been lower, even on hot day climb outs. In cruise we rarely see CHTs in excess of 300 F.
Also, your prompt attention to a very, very minor cosmetic detail after the installation, demonstrated your sincere commitment to customer service after the sale.
The product does exactly what you say it does and we could not be happier, not to mention the fact that it greatly enhances the appearance of the engine compartment.
I look forward to returning for tip tanks in the near future!
Best Regards
Ralph Smith
Utility Savings Solutions

The engine of an airplane is of the most complex, and expensive parts of our
aircraft. One of the biggest killers in small aircraft engines is excessive heat especially
cylinder head temperatures. Proper baffling is a great way to achieve proper engine
temperature. Every owner would love to see their engines make it to TBO or even
further. When I bought my Bonanza in 2011 one of the first things I noticed my CHTs
were not acceptable. If I wanted any chance of making it to TBO I knew I had to do

I met a guy at Oshkosh 2012 who as enthusiastic about Bonanzas as I was.
Fortunately, he happen to own a company that specialized in Bonanza and Baron
modifications. His name is Scott Erickson, owner of D’Shannon Aviation. After talking
with him and seeing his baffles I knew this was what I was looking for. Within a couple
of months after Oshkosh I had a set of baffles on its way.

Upon opening the huge box I looked at all the pieces and realized this wasn’t
your one size fits all baffle kits. I was going to install the baffles myself using my IAs
supervision. The quality of the parts is second to none. All of the piece have a beautiful
coating that really makes the engine compartment pop. My biggest surprise was that
every hole lined up and every piece fit. The entire kit goes together like a puzzle. The
install only took me about 25 hours and I was ready to test it out.

The difference between my old baffles and the D’Shannon baffles were night and
day. I had about a 35 degree F drop in CHTs across the board. I can now climb with no
worries of excessive CHTs. This is one modification that every Bonanza or Baron
should have.

~Shawn Botts~

              BEFORE                             AFTER

"We finally got the baffles installed and a couple of good test flights in yesterday. Climbout on an 80 deg. day resulted in a peak cylinder temp of 350 deg. at Vy (96 kts). With the old baffles I would have to transition to cruise climb (115kts) immediately after clearing the runway to keep temps below 400 deg. Cruise conditions resulted in 275-300 deg. on all cylinders. This represents an average improvement of between 25 and 50 deg. - Exactly what I was hoping to see." - Chris Nichols

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