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What is ADI?


In the early 90's Petersen Aviation Inc. certified ADI Systems on Cessna 188s, 210s and Barons, which allowed operation of these aircraft using 91 octane autofuel when the anti-detonation injection system is installed.

The ADI System (anti-detonant Injection) was developed to allow high compression engines to run on low octane (91 octane minimum) fuel safely.

A Supplemental Type Certificate (STC) will enable the installation of the system components on the aircraft and allow the operator to run the engine with more flexibility (fuel availability and price savings).

Anti-Detonant injection, also know as Water injection, is not a new technology. It has been used in aircraft prior to WWII to provide an extra boost power for take-off to prevent engine knocking.

Utilizing automotive gasoline, MOGAS,  will provide greater flexibility on your flying. Many countries where aviation fuel is not widely available will also benefit with this system. Since the price of aviation fuel is on the rise, operators will benefit from substantial savings. Currently ADI can provide savings up to $18 dollars per hour which translates to $30,000 dollars during your engine life-time.  Auto Fuel is lead free and meets the regulations in many countries. Automotive fuel is safe for use in approved aircraft. Many years of use have demonstrated the suitability of this fuel for general aviation aircraft.



In the "ON" position  the ADI system is controlled by sensors (Manifold Pressure and Cylinder Head Temperature) that will turn on the methanol injection pumps at a pre-determined setting automatically. The ADI fluid is stored in a separate 5.5 gallon tank on the Cessna 210. ADI utilizes a mixture of 60% Methanol, 39% demineralized Water and 1% soluble Oil.

The system is pre-flighted after the normal magneto, carb heat and propeller checks by momentarily pushing a spring-loaded switch which causes fluid to spray out through the dual nozzles. This richens the mixture and turns on a fluid flow light in the panel mounted control unit. An rpm drop indicates the system is working. After the test the system control switch is moved to "ON" activating the normal sense circuitry.

Whenever the system is active a "green" ADI light will indicate that the system is running and the fluid is being injected in the induction system. An "amber" light will illuminate when the ADI fluid level is bellow 2.5 gallons (Approximately 25 minutes of operation remaining). Also, the system incorporates a backup pump override that can be selected manually by the pilot in case of failure of the automatic system.

In addition to the ADI system components, the aircraft is also fitted with a electric fuel pump and a modification on the fuel system.

On the Cessna 210 the additional weight of the system is estimated at 45 pounds (5.5 Gallon tank).

Methanol can be purshased in 5 gallon of 55 gallon drum from your local distributor. Approximate price of one gallon of ADI fluid mixture is US $2.11/gal.

Approved Aircraft

FAA Approved models:

Cessna 210 210,A,B,C, G, H, J, K, L, M, N thru Serial 21064535
Cessna 188 A188, A188A, A188B
Beech Baron 95-B55, 95-B55A S/N TC-502 and ON, 95-B55B (T42A), D55, D55A, E55, E55A, 95-C55, 95-C55A, 58, 58A thru S/N TH-1395 except TH1389

If your aicraft is not approved in the list above we are currently compiling a list of airfames and and engines for future development. Please give your feedback here.


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