REV Engines REV 55 User manual

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Copyrights ©2010 Precision Aerobatics. All rights reserved
Congratulations on your purchase of REV Gasoline Engine
Safety Precautions
This engine is for experienced flyers only and could cause serious harm if used incorrectly. Always use care when running
large gas engines.
• Read this manual in its entirety before commencing use of this engine.
• This engine is specifically designed for use on a radio controlled model plane. If it is used for any other purpose, we cannot be
held responsible for its reliability or safety.
• Check the propeller prior to each use and replace if damaged.
• Always mix fuel in a well entilated space.
• Ne er operate this motor or fly alone
• Keep clear of the prop while motor is running.
• Engine can draw any loose items into propeller. Do not run engine near loose debris, dust, loose clothing or long hair
• Any one in the immediate area should wear safety specs while motor is running
• Ne er stand in front or to the side of propeller while motor is running. Always stand behind
• Always install ignition kill switch for emergency use
• Check propeller is secure before each start
• Ensure idle stop screw is adjusted to allow engine to stop when carburetor is fully closed
• Ensure spinner cone does not touch the propeller
• Ne er operate engine indoors or in a confined space
• Keep immediate area clear of spectators
• Gasoline is extremely flammable. Always allow engine to cool before refueling and keep fuel away from other ignition sources
• Always perform Radio range check before flying with engine running. If glitches are noticed, do not fly. Check spark plug lead
for holes or nicks and check there is no ibrating metal to metal connections
ounting the engine
• Make certain the engine is mounted on aircraft grade plywood firewall with a thickness of at least 6mm and is firmly bolted
using all four mounts. Large flat washers are recommended on the back side to pre ent crushing of plywood.
• We recommend blue Loctite on all bolt connections to pre ent any bolts coming loose during flight. Regularly check all
connections to insure their integrity.
• Be careful using shims or spacers behind mounting brackets and always make sure the firewall connections are flat so as to
not put a twisting load on the crankcase.
• Ensure the carburetor has plenty of clearance, allowing plenty of airflow to achie e good aspiration
• This carburetor is spring loaded to idle/cut off in case of throttle linkage or ser o failure. As a personal preference this can
be disengaged if desired but it is not recommended for safety reasons
• Soft mounts may be used but beware that excessi e mo ement can cause problems with throttle linkages and cowl
penetrations
• The throttle arm should be fitted with a ball link to pushrod to pre ent any ibration. Do not use any metal to metal
connections that may ibrate and cause radio interference (RF noises).
• The choke can be operated manually or by mini ser o.
• As this engine has a pumped carburetor the position and height of the fuel tank can be freely selected. The tank will
need to be ented but no back pressure is required from the exhaust system.
• Make sure engine and firewall are secured.
• ake sure you measure, align and drill the firewall with the correct bolt pattern. Misalignment of the bolt pattern will
put undue stress on the mounting tabs which may cause them to crack during normal operation.
Setting up ignition
• When setting up the ignition system, do not use light gauge wire for supply to ignition module.
• The ignition runs on a standard 4.8-6V battery pack. We recommend using a 900mah pack as a minimum. Higher
oltage packs (such as 7.4V LiPo) can be used ONLY with a reliable oltage regulator of 6V or lower.
• We recommend using a high quality hea y duty radio switch for ignition.

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• The ignition unit should be mounted away from excessi e heat and firmly held with cable ties or Velcro straps.
Be sure to use foam between the airframe and ignition box to pre ent ibration damage.
• Do not let the shielded plug wires rub against sharp objects or edges as this could damage the wire and allow radio
noise out causing interference.
• Make sure the spark plug cap is fitted properly and firmly to the spark plug before flying the model.
• Isolate all ignition components as far as possible from all other electrical components.
• Always perform radio range check before flying with the engine running.
Starting and operating
1. Fill the fuel tank and turn on ignition.
2. Close the choke and open the throttle to the full open position.
3. Quickly flip the propeller in the counterclockwise direction. When flipped se eral times, the engine will momentarily fire
and a popping sound of initial ignition is heard. We recommend using a leather glo e.
4. Open the choke and set the throttle at the idle position and flip the propeller. This should start the engine.
5. Let the motor warm up for a few seconds before ad ancing the throttle.
WARNING: THE ENGINE AY START ON ANY FLIP OF THE PROPELLEOR WHETHER IGNITION IS ON OR OFF!
Be sure to lower throttle to idle position once choke is removed to avoid hard kickback when starting.
Always have aircraft restrained adequately during this process.
Breaking in the engine
Be sure to use only high quality petroleum-based oil (32:1 mix ratio) for break-in.
1. Use a 32:1 ratio Pennzoil or Lawnboy Ashless petroleum-based air cooled oil.
2. Start engine and allow it to idle (2000-2500rpm).
3. The engine will run rough during break-in.
4. Allow engine to run like this for 30 minutes refilling fuel if required.
5. After 30 minutes switch off engine and allow it to cool right down by itself.
6. Repeat until you ha e run 4-5 gallons of fuel through the engine. This assures success with your REV engine.
Carburetor adjustment
• The needle farthest from the cylinder is the “high end” needle while the closest to the cylinder is the “low end” needle
(see the L and H letters engra ed on the carburetor). Winding the needle clockwise will lean the engine and anti clockwise
will richen the engine.
• The setting will ary with altitude, temperature, humidity etc. A general starting point is 1.5 turns open on the low end
and 1.5-2 turns open on the high end.
• Adjusting either needle may ha e some effect on the other, so some re-adjustment may be necessary when tuning.
• Adjust high end needle at full throttle to peak RPM, then richen slightly to ensure engine is not running too lean in flight
which may cause the engine to quit in flight.
• Adjust low end needle to achie e a smooth idle and reliable transition to high throttle.
• Set the high end needle slightly rich during break-in period.
• Further adjusting may be necessary once cowl is placed as this often changes air pressure around carburetor intake
aintenance
•Use 87-91 Octane unleaded gasoline/petrol mixed with high quality 2 stroke synthetic oil. We recommend the Amsoil Sabre
synthetic oil at a mix ratio of 50:1.
•Ne er use alcohol or similar based fuels.
•A oid running engine at low speeds for long periods as spark plug may become carbonized.
•Regularly check fuel tubing to make sure there are no leaks.
•The carburetor fuel screen should be cleaned periodically. Carefully remo e the pump co er, gasket and pump membrane.
The screen will be isible and can be cleaned after careful remo al.
•Use a fuel filter between your fuel container and the plane’s fuel tank while refueling. We also strongly recommend using a
high quality fuel filter between the plane’s tank and carburetor.
•Verify the balance of your propeller and check for any damage or chipped tip. Damaged propeller must be replaced!

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Trouble shooting
Engine won’t start:
•Engine could be flooded (the REV engine only needs to use choke for the first start of the day).
•Low battery oltage.
•Check tank enting, clunk position, fuel flow.
•Check fuel lines for kinks, holes or damage.
•Check fuel flow while flipping.
•Check throttle is open.
•Ensure prop is flipped o er with authority.
•Verify ignition switch is ON.
otor runs poorly:
•Engine could be too rich. Ensure both needles are adjusted correctly.
•Ensure carburetor has not become loose, causing air leakage.
•Check all ignition connections and switches.
•Ensure fuel is freshly mixed and is free of humidity and water.
•Ensure spark plug is tightened firmly
Warranty
•Your REV engine is co ered with a two year warranty from the initial date of purchase for defects in workmanship or materials.
•Ignition unit warranty - please refer to our website www.Re Engines.com
•Any modifications to, or disassembly of engine or ignition will oid warranty of that item
•Replacement items will not be shipped until defecti e items are recei ed by Precision Aerobatics and confirmed to be defecti e.
This warranty does not co er:
• Shipping damage incurred from shipping to and from Precision Aerobatics.
• Shipping charges, for warranty ser ice, to and from Precision Aerobatics.
• Damage caused by improper handling, operation, maintenance, modifications, fuel, oil, fuel additi es or crash.
• Disassembly and/or modifications of the engine or ignition unit will oid warranty!
Specifications
Specifications REV 55 REV 28
Capacity: 55CC 28CC
Configuration: 2 stroke single cylinder air cooled 2 stroke single cylinder air cooled
Carburettor: Walbro acuum pump Walbro acuum pump
Ignition: RCEXL ignition system (CDI) RCEXL ignition system (CDI)
Power supply: 4.8V – 6V battery pack 4.8V – 6V battery pack
Weight: 1,406g engine, 120g ignition, 92g muffler 907g engine, 120g ignition, 62g muffler
Maximum rpm: 9,000 RPM 9,000 RPM
Idle rpm: Approx 1200-1300 RPM Approx 1200-1300 RPM
Gasoline/Petrol: Pre-mixed 87-91 Octane unleaded mixed with
high quality 2 stroke synthetic oil
Pre-mixed 87-91 Octane unleaded mixed with
high quality 2 stroke synthetic oil
Propeller selection: Break-in: Vox 22x8 laminated wood
After break-in: Vox 22x8, 22x10, 23x8, 23x10,
24x8 laminated wood or Carbon
Break-in: Vox 18x6 laminated wood
After break-in: Vox 18x6, 18x8, 18x10, 19x6,
19x8 laminated wood or Carbon

4
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Copyrights ©2010 Precision Aerobatics. All rights reserved
Optional accessories available from PrecisionAerobatics.com
High quality fuel line
Item code: AC-1619
Available in two inside diameters 1/8” and 3/16”. 1/8” is suitable for u to 100cc. 3/16” is for larger engines. Made in the
USA. S ecially formulated it is su erior to Tygon. Su er flexible, it is suitable for Gasoline, Kerosene and Smoke Oils. Buy
any length you need (sold er foot).
Top quality CNC machined fuel filler (fuel dot)
item code: AC-1632
This is a beautiful su er lightweight, affordable scale looking filler. Bolts, O ring and CNC machined back late are
included. Sim ly drill a hole in your fuselage to com lete the installation on any giant scale air lane.
Precision CNC machined fuel filter
item code: AC-1868
This beautifully CNC machined, fuel/smoke filter is smartly designed to rotect your large engine. Made for high volume
the filter is suitable for both gas and glow fuels as well as smoke oils. Using O ring it rovides erfect seal to revent any
kind of leeks. Can be easily o ened and cleaned. Made for PA in Germany
Vox gas propellers
Made of laminated hardwood for added stability and strength. Designed for gas engines o eration they feature heat and
distortion resistance, low air friction (meaning they are relatively quiet) and greater thrust. Their accurate machining
guarantees accurate flight erformance - making them a erfect choice for IMAC and recision aerobatics.
See www.Vox ro s.com for more information.
Vox Gas Prop quiver ag
item code: AC-2159
Vox ro ellers offer a high quality double added ro eller quiver bag, made of strong durable
canvas on the outside and smooth fabric on the inside. The Vox quiver bag is closed from all sides
so the ro ellers cannot sli out by mistake, yet you can easily insert and remove them. The bag
holds 4 ro ellers u to 33” in length.
Propeller protection ag
item code: AC-2153 & AC-2152
Double foam and thick canvas rotect your carbon or wooden ro eller (and rotect you and the surrounding from the
ro ).
Available in two sizes
27" - 34" ro ellers item code: AC-2153
22-26" ro ellers item code: AC-2152
30-35% feather-weight helmet pilot
item code: AC-1843
Com lete your air lane with PA realistic helmet ilot figure. Made of fiberglass and re- ainted with high glossy finish, it is
incredibly lightweight.
Installation is extremely sim le and you can choose to have the ilot removable using the rovided hardware or fixed to your
cock it. Can be used in 30% air lanes with a little cut to the shoulders or in a 35% as it is.