Started by British Victory, December 01, 2017, 21:45:39 pm
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Quote from: Redbaronn on December 06, 2017, 08:29:03 amDefinitely too rich, the black oil deposits will now probably never go completely, the oil is doing what it is supposed to do stick to metal, no harm done better too rich than too lean
Quote from: Marcol on February 05, 2018, 16:23:21 pmI've had this on quite a few of my petrol engines. The worst culprit was a Zenoah 80 twin in a 1/3 scale Cub. I ran this engine on the very best Bel-ray synthetic oil and the amount of black gunk underneath the model after a flight was horrendous. So after trying all the usual carb adjustments I threw caution to the wind and drained the tank and refilled with the petroil mix that I use in my strimmer , hedge-cutter , masonry cutter etc. What a revelation , no more gunk and a perfectly clean model. I think , and this is my reasoning only, the top quality synthetic was too good. It lubricated the engine brilliantly but it then came out of the exhaust much the same as it went in. The oil that replaced it in the premix was Halfords Garden machinery oil. A mineral oil that cost about £6 a litre. Now before anyone throws a fit. My Stihl cutter is nearly 20 years old and my Makita strimmer is 13 years old and they perform like new and they have only ever been run on a cheap mineral oil. There's no model engine made that gets a harder life than a petrol cutter , flat out in concrete and brick dust. The oil lubricates the engine but is burnt in the combustion chamber and comes out as smoke. Just my 2 pence worth.
Quote from: discus.fly on February 17, 2018, 17:40:55 pmTrader easily found for aspen fuels and a gallon was purchased for £18.50, so will be interested to see how the engine performs on this fuel.
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