Replies

  • This is how we took compression on our Viking 130 aircraft engine. Necessary tools will also include a reliable automotive compression tester with 10mm thread adapter, spark plug socket w/magnet built-in to lift plug from deep well, and inch/lb torque wrench.

    1. Allow engine to reach operating temperature.
    2. Disconnect the electrical connector to each ignition coil, and remove the coils.
    3. Remove the four spark plugs. Ensure debris does not fall into the cylinders. Note: lay out spark plugs and analyze condition.
    4. Attach the compression gauge to the first spark plug hole.
    5. Remove the air filter and ensure the throttle is fully open.
    6. Crank the engine with the starter motor as many as ten revolutions, and measure compression.
    7. Remove compression gauge.
    8. Repeat steps 6 & 7 on the other three cylinders.
    9. Reinstall spark plugs and ignition coils. Note: use aluminum anti seize on the plug threads.
    10. Reconnect the ignition coil electrical connectors.
    11. Log engine hours and findings in maintenance records.

    Compression Pressure should be above 981 kPa (10.00 kgf/cm2, 142.2 psi)



    Maximum Variation between cylinders should be within 196 kPa (2.00 kgf/cm2, 28.4 psi)


    If the compression is not within proper specifications, perform a cylinder leak down test to determine the problem area. Consider the following items:

    Incorrect Valve clearance
    Confirmation of Cam timing
    Damaged or worn Cam Lobes
    Damaged or worn Valves and Seats
    Damaged Cylinder Head gasket
    Damaged or worn Piston Rings
    Damaged or worn Piston and Cylinder bore



  • Well done Loren
  • Loren, thank you very much. This is very helpful.
  • What kind of compression gauge are you using? Mine doesn't reach into the spark plug hole. I need to find an adapter, or fabricate an extension. I have the 180hp engine, so it may be deeper than the 130hp engine.
    • Eric, I have an old compression tester kit that has a 12" hose attached which fits different plug threads. Added a 10mm thread attachment, and it works great.
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Activity

Viking Aircraft Engines replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"The modern engines do not care what altitude they are at. The engines do not “know” what altitude they are at. They do not need this information.

The engine “Know” what the temperature and manifold pressure is. From this, the correct amount of…"
Sunday
William Batten replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"Thanks. How about the Turbo 195 - does it lean with altitude like the 130?

Bill"
Sunday
Viking Aircraft Engines replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"Only if you would like to do so. The engine will start and warm up on its own."
Saturday
William Batten replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"Thanks! I have another newbie question. Since the Viking engine is built to automotive tolerances regarding piston to cylinder clearance - is preheating required in cold weather?"
Saturday
Jose P M Almeida replied to bob noffs's discussion fuel for 110
"Hi Bob. Yes you are right. The manual says maximum of 15% but all auto gas here in Brazil has 25% or 27% ethanol. Since I am monitoring closely and I had no issues with 90 hours of flight and it is a very clean fuel, the only concern would be the…"
Jan 7
bob noffs replied to bob noffs's discussion fuel for 110
"thanks jose. isn't 25% a little high for this engine?"
Jan 7
Jose P M Almeida replied to bob noffs's discussion fuel for 110
"Hi Bob. My 110 engine has 90hs. I use auto gasoline here in Brazil with 25% ethanol. It has 95 octane. I used 100 LL only once just to test. Saw no noticable difference."
Jan 6
Bill Encke is now a member of Viking Aircraft Engine Forum
Dec 21, 2020
Eric Johnson left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Chane, sorry, I misread your name.
I did some experiments with the coil spring, compressed it with a hydraulic press on a scale until I didn't dare compress any more.
Viking steel bungee spring compression rate

spring length  
  force total  
 …"
Dec 14, 2020
Chane Burk left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Thanks Eric,
I started my 801 in 2008. I’m getting close to finishing it now and my original bungee is sagging. I would rather change it for a spring than buy a bungee that I’ll have to change every year.  I just wanted to make sure the Viking…"
Dec 13, 2020
Eric Johnson left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Hi Chuck. Yes, I put a steel bungee on my 801. Haven't flown it yet, but did a lot of taxiing and it seemed to work fine. Compresses about an inch, and has another 3 inches of travel.
The inner diameter of the tube seemed to be a little tight and…"
Dec 13, 2020
Chane Burk left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Is anyone flying an 801 with the steel bungee? "
Dec 8, 2020
Viking Aircraft Engines replied to William Batten's discussion Altitude Compensation - Fuel Mixture
"Yes, it does that and there is no altitude limit for this"
Dec 6, 2020
William Batten posted a discussion
I'm new to this forum and new to Viking Engines. I'm early in my research. My question is: Does a Viking 130 engine reduce the fuel rate automatically through the ECU as altitude increases - to lean out the mixture? If so, is there an altitude limit…
Dec 6, 2020
Viking Aircraft Engines left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Has been done on similar aircraft like tyhe Hawk and Rans S-12"
Dec 1, 2020
Dave Hallier left a comment on Recent Activity - Add Comments, Videos and Pictures Below
"Curious, has anyone put a Viking 90 install ona Challenger II type aircraft?  Would seem far less costly than the ROTAX 582 system."
Dec 1, 2020
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