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#11
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I have a '65 172 and love the O-300. When I first got it I had
problems with plug fowling (despite leaning on the ground, etc.) and had a valve stick HARD. The previous owners had fed it a steady diet of 100LL. I started using mostly auto gas and the problems have gradually gone away. The engine was rebuilt with new Millennium cylinders and to new tolerances in 99 and had 1050 hours when I bought the plane a year ago. One cylinder had been replaced at about 600 hours due to valve problems. I flew a little over 100 hours in the first year and compressions were all in the 70s when I had the annual done last month. They key, like with any engine is to fly it frequently. 1. What kind of fuel burn do you consistently get with an O-300? Is the generally reported 105 KIAS @ 8 GPH true? I plan 9 GPH block to be on the safe side. 2. Does the autogas STC help reduce the problem with valve sticking? ABSOLUTELY -- so does flying frequently and using Marvel's Mystery Oil. 3.In general, has your experience led you to expect to have to do a top overhaul about halfway through the TBO period? What are the ballpark costs of such an operation. 1200 HRS SMOH -- Compressions in the 70s, engine runs great, uses very little oil -- (about 1 Qt per 15-18 hrs.) 4. In your opinion, would it be worth it to pay the premium to buy an new 172 equipped with the O-320E2D? No, but they're great planes too. I bought a 172 with the Continental specifically because they are such good bargains. But you have to be careful to get the right one. The Millennium cylinders and regular use since overhaul were factors I considered in purchasing this one. 5. Besides the valve guide and cylinder problems (often attributed to running on 100 LL), are there any other major problems that would make this an undesireable aircraft? The older 172s have narrower gear, lighter weight and slightly different handling due to cuffed wings on the later models, etc. All this makes them a little more challenging in winds, but still a wonderful airplane. Like others have said, carb ice is a definite issue, be proactive about checking for it and using carb ht when necessary. Remember to apply carb heat right before takeoff if you've been idling a long time; even if you already checked carb heat earlier during your run-up. - Brett |
#13
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"Rosspilot" wrote in message ... 4. In your opinion, would it be worth it to pay the premium to buy an new 172 equipped with the O-320E2D? You're talking apples/oranges. You call a difference of $100,000 a "premium"? I think he just meant a later model. The "NEW" 172's don't have O-320's, they have IO-360's. |
#14
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Jim Weir wrote in message . ..
(Brett Justus) shared these priceless pearls of wisdom: -I have a '65 172 and love the O-300. When I first got it I had -problems with plug fowling How did the chickens get in to the engine in the first place? HEY spell check says that word is just fine! (WoooOOOPS) -ABSOLUTELY -- ... and using Marvel's Mystery -Oil. Somebody else must have used my computer when I was away -- I would never do that. Certainly not in a CERTIFICATED aircraft. Merciful heavens to Betsy {;-) Jim |
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