Answer: For a kero start engine:

• You do not need to carry gas

• You do not need a restrictor valve

• Your engine will start on cold days - it is difficult to get the gas to flow on cold days

• The tubing is much simpler & neater with kero start - especially for a helicopter

• We have taken a long time to design our kero start burner so that it is gentle - on the helicopter it needs to be gentle or it will scorch the exhaust.

• The kero works perfectly at low or ambient temperatures.

• Kero start works almost automatically - you do not need to handle gas cans & tubing to start your engine.

• Kero start is "the way of the future" - the latest technology. Since Wren Turbines introduced kero start engines in April 2011 we have had NO orders for gas start engines.

• If you still cannot make a decision we can build your engine as gas start & if you change your mind upgrade it to kero start (but we cannot reverse kero start to gas start).

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Question: MW54 - How do I tell what mark engine I have?

Answer: As a general rule:

MW54 MK I & II engines have 5 front blades on the compressor.

MW54 MK III has 6 front blades on the compressor.

MW54 MK IV has 7 front blades on the compressor.

Question: What components do I need for a MANUAL to AUTOSTART upgade?

Answer: • Autostart ECU main unit & HDT
• Solenoid Valves (2) (+ 2 male stud/festo per valve)
• Cable – Battery & Pump
• Cable – Glow Plug & Starter Motor
• Integral cable + plug cap
• FOD screen + starter motor/bendix

AUTOSTART CONVERSIONS ARE NOT SUITABLE FOR SILVER CASED WREN 44 ENGINE

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Question: OIL - What type of oil should I use in my Wren Engine?

Answer: We recommend Mobil DTE Light OR Mobil Jet 2 OR Castrol TT - motorcycle oil (red in colour)

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Question: PROPANE - What is the recommended butane / propane mix for engine start?

Answer: For gas start engines Wren recommend a mix of:

20% to 30% Propane
70% to 80% Butane

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Question: RPM READING - ERRATIC

Answer: The RPM can pick up noise which causes it to run erratically - please check the following 4 points

• Make sure the glow plug cables are twisted/plaited sufficiently

• Does the glow plug wire pass near the RPM – as it can pick up noise from this

• Make sure that the starter motor wire and glow plug wire is well away from the FOD screen

• Have any wires been extended & accidentally reverse connected

• Is the earth for the glow actually on the glow – if it is not it will cause a problem

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Question: How do set the clearance for the STARTER MOTOR clutch?

Answer: Loosen off the 3 screws that hold the starter motor in place (1.5mm allen key)
Remove the black cap on the starter motor
Push starter motor as far forward as possible – GENTLY – towards the engine compressor nut.
Turn starter slowly to make sure it is engaged with the compressor nut
Mark a line on the starter motor with a pen – in line with the FOD screen
Pull back the starter motor by 1 - 1.5mm – use the line you have marked on the starter to judge the distance
Tighten the screws on the FOD screen/starter motor – GENTLY (use 2mm allen key for FOD screen)

Question: STORAGE / COMING OUT OF STORAGE

Answer: The manufacturers' advice is to run your fuel pump on oil ONLY at 1-1.5 volts for a few minutes before you store the engine for winter and repeat this operation when taking your engine out of storage.
This will ensure the pump seal does not harden. Please make sure that you then run your pump on your usual oil/fuel mix (5%/95%) for a further few minutes before you put the pump back in the engine.

Question: SUPERSPORT UPGRADE - Can I upgrade my Supersport to a Wren 100?

Answer: No - even though many parts of the Supersport have been incorporated in the Wren 100 build, the Wren 100 is a DIFFERENT engine.

Question: TAILPIPE - Will adding a Wren Tail Pipe to my model reduce engine thrust?

Answer: NO - In fact it increases thrust by 1/2lb+ (0.23 kgs+)

Question: TAILPIPE - What distance should I leave between engine exhaust and tailpipe?

Answer: We usually recommend a gap of 25 to 30 mm between the efflux tube and the tailpipe.

Question: THERMOCOUPLE Extension Lead

Answer: To extend the Wren thermocouple lead you can use a JR servo lead with gold plated plugs

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Question: WREN POWER PLUG - Which ECU is compatible with the new Wren Power Plug?

Answer: The Wren Power Plug is only compatible with the new Fadec AU-107k (part no: 1165) & the Projet ECU.

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