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 This is page 1 of 2

To see Fuel, Oil, Coolant and Air diagrams, go to (Page 2 of 2)

To see the SENSORS we are monitoring in our testing.

DeltaHawk V-4 Turbo Diesel

Engine Monitoring - If you are considering installation of a diesel engine, the engine parameters we suggest you monitor are:

 Required Engine Sensors:

These engine sensors must be installed on the engine and monitored whenever the engine is running to ensure safe and reliable operation of the engine. 

Tachometer - This should be a hall effect or magnetic pickup type. There is no magneto impulse to pick up, and no mechanical drive           

Fuel Flow – A minus B type fuel flow.  30 gal/hr max. total fuel circulation

Fuel Pressure - Normal pressure between 40 and 80 psig.  Located between engine 5 micron fuel filter  and the high-pressure injector pump housing.

Fuel Temperature – Location as per fuel flow diagram provided in installation manual.

Coolant Temperature - Normal 220o F. Minimum 150o F. for take-off. Maximum 240o F

Oil Pressure – Standard 0-100 psi.  Located in accessory block as per oil diagram provided in installation manual. 40 psig min. normal operating,  50-70 psig normal operating range.

Oil Temperature - Standard.  Normal 180-200 deg F. Minimum (cruise) 140 deg F. Maximum 215 deg F.  (Out of cooler to the engine)

Inter Blower Temperature (IBT) – Only needed if intending to use engine above 18,000 ft pressure altitude.  Provides first indication of impending Turbocharger failure.

Cylinder Head Temperature (CHT) - One probe for engine.  Used to monitor engine temperature in event of coolant system failure.  Range is 270-300 degrees F. Peak allowed ~350 deg F.  Max allowable 500F without coolant.

Manifold Pressure - Turbocharger maximum pressure should be no more than 80" Hg above ambient, approximately 110" Hg total.  Unlike spark ignition engines, does not indicate engine power output of DeltaHawk engines.

Other Engine Sensors:

These sensors are optional and are not required for the safe and efficient operation of the engine, but would provide additional information about the condition of the engine.

Coolant Pressure - Use gauge capable of 25 psi maximum. Not mandatory. May give early indication of coolant leak.  Located on the coolant reservoir.

EGT – Not necessary, but will be good tool for diagnosis of engine condition and cool-down of turbocharger.  Measured at turbocharger turbine inlet. Standard EGT thermocouple probe. This is not mandatory since inlet temperature never exceeds turbo limits. There is no mixture to adjust so EGT is not needed for that purpose. Expected peak is 1150 deg F

Cylinder Head Temperature – One probe for EACH cylinder.  Used to assess condition of engine.  If a fuel injector becomes inoperable, that cylinder head temperature probe may indicate a lower temperature that the other cylinders. Also provides guidance on max power available with loss of coolant event.


We recommend a boost pump for starting and backup.

Velocity Installation Work-Arounds - If you are considering using the V-4 diesel engine in your Velocity project, the following things should not be done until final engine selection.

1. Do not install the oil cooler in the nose. For the diesel, this would be mounted along with the radiator on the belly scoop that will be part of the firewall forward package. If you have already done the installation, that is O.K. You can use it for cabin heat using the engine coolant.  For Radiator sizes and requirements, go to Velocity Installations page.
2. Do not install the engine cowling to wing flanges or the "armpit" air scoops. These will both be replaced with molded parts that will re-configure the cowling for the diesel engine.
3. A frequently-asked question is system voltage. The starter is 28 volts, as is the alternator. (Note that the alternator is now part of the engine package, not an option.)  Please see the 14 vs. 28 volt question on the Q&A pages under "Starting/Air Supply" and our answer.  Both voltages can coexist with the addition of a converter or relay.
4. The fuel caps supplied have a 2" opening. You will probably want to replace them with larger ones since jet nozzles are larger than avgas nozzles. A minimum 3" opening is required. Alternatively, you can use a funnel.
Suggested Fuel Cap:
Aircraft Spruce #416-51AB (800) 824-1930

Delaying these tasks until your final engine decision will save you the time and trouble of doing things over. This should help you prioritize your construction plan. Good luck with your project.

Notes to all builders.

1. We recommend that main fuel tanks have flow through air venting as a safety measure with Jet A or diesel fuel use. In the Velocity it's a simple retrofit by adding a T to an existing vent line. Other aircraft types might require more advance planning with the kit manufacturer.
2. A report from a Van's RV-8 builder notes that the high air holes between the fuel tank baffles are small and may limit the rate of fuel fill, especially with the high flow rate of Jet A fuel nozzles.

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