QT430 Powerplant 
Cessna 172 V8
Travel Air 2000
Developing Programs

Mounted QT400
Mounted QT430

Detroit Engineering
Detroit Engineering

Slow Rev Paddle Prop
Slow Rev Paddle Prop

QT430 Powerplant

If you have a need for a proven engine, you have to study the "QT430" package, it uses all of the components on and around the GM all aluminum 6.2 LS3 V8 engine.  It is the perfect engine at an exceptional price for any airplane and really performs for the bigger aircraft.  This is the same engine that will have an FAA Type Certificate as used in the STC for the Cessna 172 conversion.  If you need economy of operation and service plus safety, it shines.  The 172 shown in the side bar is our experimental test aircraft which we use to demonstrate the merits of the installation.

One must realize that using Detroit technology will always satisfy our Planet’s commitment to noise suppression, alternative fuels, global warming, while providing the best operating economics and convenience.  They give you a dependable engine, and keep you on the leading edge.  It's an accepted fact that the crank/connecting rod engine is here to stay. There may be a better design, but the production is too broad and extensive to change. This LS Series of engines do deliver as they are Performance Engines.  QA gives you a universal package that has many more features than others and yet gives you a much better price. 

This "QT430" package  includes everything firewall forward and aft  except your mount and cooling system that are unique to your plane.  If you would rather use your own propeller rather than the ground adjustable that is in the package, there will be a $2,000 discount.  For the cowling fit, this engine will have a profile 12” above the trust line and 8” to either side starting 13” behind the prop flange face.  And there must be 40” from the flange face to the firewall.

Look at these outstanding details and capabilities:

Crate Engine
Crate Engine















CAD Drawings of LS3/7 Installations (Click to enlarge, with Acrobat 8.0 or better, then click to activate viewing)

1. CONVENIENCE & COST – Detroit does assure you of using the most practical, most economical propulsion available, FOR SURE.  Parts and service are always local and reasonable.  A new and complete crate engine for a few thousand dollars can replace the old engine with 2 technicians in 4 or 5 hours, making an overhaul quick and cheap.  You use all of the auto sensors and controls to always operate at peak efficiency where you can have real single power control.   One prop rotation for each start, every time. 

The "QT430" package is sold with how-to instructions for $24,500 FOB Orlando.

Here is what you get:

  1. GM Crate Engine w/ ignition, injection and most sensors, already checked on test stand.
  2. 2:1 helical gear box with fluid and Lycoming hub.
  3. Soft rubber drive coupling and fasteners.
  4. Flexplate starter ring.
  5. Composite prop blades closest to your application.
  6. Ground adjustable 2-blade propeller hub (3 and 4 blade are options).
  7. Hi-torque GM starter.
  8. 2.5” exhaust swivels, flanges, and gaskets.
  9. 45 amp alternator, pulley, bracket, and belt. 75, 120, 140 and 160 amp alternators are also available along with a dual setup.
  10. Air filter box, filter, and adapter to the throttle body.
  11. MAF sensor and connector.
  12. ALDL connectors (diagnostic).
  13. Serpentine belt, tensioner, and idler.
  14. Exhaust manifold oxygen sensors.
  15. Electronic throttle lever (accelerator pedal) or vernier throttle w/ electronics.
  16. Front engine stand-off mounts and isolated shock mounts (like lord) for the gear box and stand-offs.
  17. 2ea 75 psi continuous flow fuel pumps, regulators, regulator AN fittings, check valves, pressure gauge, and in-line filter (GM submersible pump, regulator, and fuel level sender can be substituted for one or both).
  18. 6.5” screen, 4 push button, LCD daylite monitor with basic engine parameter display and menu for operating options that will have backup manual throttle.  8.5” screen, other operating options, and a custom display or your options are available.
  19. Complete auto electrical harness, needed connector pins, power and ground connectors, and the electrical circuitry/tables needed to rewire the engine.
  20. 2 computers (ECU’s).
  21. CAD drawings of the LS3/7, gear box, prop and accesories. These are instep/ stp for your design application, and will be forwarded as an Alibre output to your email request.
  22. And suggestions covering many aspects of the installation and its use.

Options for higher (or lower) hp engines and for an electric hub or special props are available.  MT Propellers, headquartered in Deland FL, is an excellent source for higher hp props having a selection from more than 100 to suit your mission.  On the other hand, Sensenich in Plant City FL has a broad choice of small aircraft wood and aluminum or carbon fiber airboat props.

Dyno Curves
LS2 Dyno Curves

2. FLEXIBILITY –With the choice of propeller or propeller pitch, you can de-rate your engine to the hp output you desire (displayed on the monitor), slowing its speed and gaining fuel economy plus adding to your TBO.  Continuous hp are shown on the engine monitor. You don't need the POH to set prop and power, you jockey prop pitch and MP to get the power output you desire.  An electric controllable prop makes this easy and the potential fascinating.  You don’t sacrifice weight as this package will be near that of the Cessna 172 Continental setup.  You will see 5 gph and could expect 3,000 hours between overhaul or replacement.  Similar to the auto, you have the option to run on 4 and 6 cylinders as you choose.  Engine options in the same engine block are available ranging from 430 hp in steps to 650 hp.  By de-rating your engine, you leave extra hp that increases your service ceiling and can be used for high altitude boost, air conditioning, more muffling, and you can maintain a constant climb rate to much higher altitudes.  In our Cessna 172 test aircraft, the engine is de-rated to 180 hp to conform to the structural limits and is licensed in the Experimental Category.  Since the engine and associated equipment must be FAA licensed in the Experimental Category, they are not sold as direct replacements for any FAA certified production aircraft including Cessnas, Pipers, etc.

Cooling Intake
Cooling Intake

3. PERFORMANCE – You are liquid cooled and this has its many merits.  Reducing cooling considerations and cowling drag without shock.  With a radiator fan, you can forget about cowl flaps.  The engine design and operation naturally give you better efficiencies and effectiveness.  With this GM LS Series, 4th Generation Engine, you are all aluminum with better heat transfer and reduced weight, still a small block with big block outputs.  The cooling system is very efficient with its departure from the conventional layout.  Here you see in our test aircraft, the cooling intake used the original carburetor air scoop. The engine was designed for marine and sport applications running near full continuous power so it is ideal for aircraft. 

Db Sound Chart
Db Sound Chart

4. ENVIRONMENT – With the package you receive resonators that are embedded in the exhaust pipes reducing the noise level considerably inside and out.  We believe that the engine installation in the 172 is among the quietest -- if not THE QUIETEST aircraft in the general aviation fleet. You operate with 87 octane mogas but your engine can evolve to the better alternative fuels along with the industry, like the E-gases.  A change in the computer logic and the fuel injectors converts to pure ethanol.

Helical Gearbox
Helical Gearbox

5. SPEED REDUCTION UNIT – A very durable, 55 lb 2:1 helical gear box is used that is part of our FAA certification package. The gear box has been used in abusive airboat operations for over 25 years, handling over 1,000 hp. It is a reversed rotation, maintenance free, self contained, Almag and Chromalloy unit with a soft coupling to smooth the engine impulses and avoiding system harmonics.  It separates the crank and prop shaft by 4” and uses a conventional 6 bolt Lycoming hub.  An alternate gear box is available that is a little noisier running on spur gears but it will give you 5 3/8” shaft separation, lowering the engine another 1 3/8”.  This gear box is still a left rotation but does offer a choice of reduction ratios from 1.5 to better than 3.

MT Propeller
MT Propeller

6. PROPELLERS – A modified MT Propeller electric hub interfaces well with the engine package and provides both C/S and variable pitch operation.  We used it effectively for experimentation and performance enhancement.  We have computer and professional assistance to design your own custom blades or you can call on the prop manufacturers and their inventory for help.  We have flown a ground adjustable, paddle blade with great success, and at extreme blade pitches.  So your options are great.  We are investigating a revolutionary prop blade for even better operating efficiency and noise reduction at low prop and high aircraft speeds. 

Engine Monitor Display
Engine Monitor

7. COCKPIT DISPLAY – A daylight, liquid crystal monitor similar to that shown is provided in the package so that you can choose from the many engine functions to view in a format of your own choice.  Here you have access to the complete diagnostic scan used by auto technicians to trouble shoot or tune performance even in flight.  A commercial automotive diagnostic tailored to this package is available.  Button and menu choices bring options for safety overrides, your 4 or 6 cylinder ops, constant hp or MP operation, constant prop speed, an altitude hold, and more of your making.

Redundant Fuel Pump
Redundant Fuel Pump

8. SAFETY – Redundancy in this "QT430" package surpasses all other power plants.  These LS engines meet strict Quality Control standards because they are assembled by selected technicians of the Performance Build Center.  The engine and sensors are untouched.  External, dual, dry fuel pumps replace the auto submersed one for space, simplicity, duplication, and for other reasons.  You can use the GM submerged pumps but they require a tank depth of at least 12”.  You have excess power with most applications to increase its robustness and carry on after losing one or two cylinders. You can have single or dual alternators with outputs from 45 amps to 160 amps, add a cooling fan, include an oil cooler all for safeties sake.  Our Odyssey, sealed battery gives well over 1 hour of engine operation by itself.

Open Cowl of TravelAir with QT400 Installed
Open Cowl of V8 TravelAir


This package has been a decade in evolutionary development.  A built up engine was first flown in an antique classic with good success.  It was then flown in a Travel Air 2000 biplane which has logged some 300 hours of safe operation.  An update then was placed in the Cessna 172 with some 50 hours before being replaced with the LS2. 

Come and fly this Cessna to observe the advantages.

Again, the price is a very reasonable $24,500 FOB Orlando for a piece of mind and bunches of extras, or $22,500 without the propeller.

Please "Contact Us" for further information, questions, or to arrange an appointment to discuss your QT Powerplant needs.

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