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old fart

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About old fart

  • Birthday July 14

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  1. The Gen 4 heads are effectively one piece thermally with the barrel and the barrel is now alloy and a far better conductor than steel, this would assist in the head at the sensor point being held cooler by the barrel than previous Generations. A fair bit of the barrel is within the duct. The barrel now has larger fin area. Someone may have a figure on surface areas of the gen 4 vs earlier. There is also the relativity of a rough surface of a casting vs a shiny CNC surface of barrel and heads. As an aside is there an advantage in black heat dispersant coating vs silver alloy finish. Such coatings are commonly used on air cooled motorcycles. OF
  2. old fart

    old fart

  3. O F.  Thanks mate for that report,  Those figure you have supplied are a bit confusing to me. Could you elaborate there.  Our CHT is J or K  ( cant remember but it is correct) and are all in C.  Pistons  1 and 3 well over 200 C in climb. They just below 200 c in cruise.  I think that the ram air ducts need more deflectors as your has.  Paul R.

    1. old fart

      old fart

      Hi,  All figures are C.  I had high figures with wrong probe types.   Suggest you check probe is reading near 100 in just boiled water.  

      One other thing is the air getting out Ok.  Have you got the lip on the lower cowl to create the low pressure area?  Is there a good seal round the oil cooler so no waste air entering the engine bay?  All air in should be either in through the two nostrils or via the cooler.  


  4. I have a 160C with a 120 hr Gen 4. Dynon probes and a TC3 gauge. W100 +. When first added the indicated temps were high round 180C and correct at room temp. The correct probe type J or K type needs to be programmed. I do not go over 150 on takeoff and cruise round 120 at 12C OAT. With the standard ducts I did have hotter front cylinders but added two deflectors about 70x12 mm about 45 deg to the top underside of the duct. They are near the rear of the front cylinders and about the same relative distance as the rear of the duct is behind the rear cylinders. The spread is now fairly tight Example Max figures after 1.8 hr flight at 24 C. 709 742 693 721 - 140 136 139 137 cruise CHT 123. O F
  5. First time post. I'm a shy Jabiru J160 owner, looking forward to accessing site.
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