Nigel R Posted October 28, 2018 Share Posted October 28, 2018 I succumbed to temptation and picked up one of the irvine 39 motors that were recently turned out for the wot4 pro.It's a beautiful bit of metal. Irvine production values really were right up there. Anyway. That aside.The engine is brand spanking new and had the most ABC pinch I have ever felt. I'm almost scared to turn it over - and so far i haven't.I don't want to damage anything so what's the deal with the first start, should I try and warm it up somehow or just make sure there is plenty of lubrication and get it going as usual? Quote Link to comment Share on other sites More sharing options...
Ron Gray Posted October 28, 2018 Share Posted October 28, 2018 I had the same dilemma with a West 52, it needed ‘two hands’ to turn it over, it was so strange I contacted West who said not to worry about it, just run it. So for the first start I used an electric wrist but for all subsequent starts I backflip it. It got better after a few (20) flights but still is tight. Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted October 28, 2018 Share Posted October 28, 2018 Warming it up won't hurt & may well help a bit.....use a hot air gun to get the cylinder nice & hot then start as usual. Short fast runs just slightly rich with a cooling off period in between are the best way. Don't run it rich & slow.....it needs to get up to temp as fast as possible.... Quote Link to comment Share on other sites More sharing options...
Don Fry Posted October 28, 2018 Share Posted October 28, 2018 Last November I bought an ASP 52. It was tight to stupidity. It was a Hobby King job, cheap as chips, so I just ran it. Pinch had tamed to tight good conpteesion after about 2 hours, and fully nice after the first 5 litres. Destroyed recently when the airframe disintegrated at 100 meters during frisky manoeuvres , and the engine hit the crushed/rolled stone patch we use as a runway. I've just replaced it with a new secondhand ASP 60. Just the same. The similarity to its smaller cousin gets me thinking that how they do it now. Edited By Don Fry on 28/10/2018 14:16:47 Quote Link to comment Share on other sites More sharing options...
John Duncker Posted October 28, 2018 Share Posted October 28, 2018 A hot air gun on the cylinder will make it easier to hand start. As others have said it is really important to get them up to running temp ASAP. short bursts of full throttle and a few seconds of slow running. It is important to use a smaller than normal prop. Quote Link to comment Share on other sites More sharing options...
Don Fry Posted October 28, 2018 Share Posted October 28, 2018 I just flew it. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted October 28, 2018 Author Share Posted October 28, 2018 Great stuff thank you chaps. I shall just get on with running it in the usual way. With some warming if I can arrange it. I had a 36 many moons ago, I don't recall that having a pinch like this. Doesn't mean it wasn't. Memory being fallible and all that... Quote Link to comment Share on other sites More sharing options...
Former Member Posted October 28, 2018 Share Posted October 28, 2018 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
onetenor Posted November 1, 2018 Share Posted November 1, 2018 I've a used O,S. 40 with the same problem. Not too tight with the plug out. Quote Link to comment Share on other sites More sharing options...
Bruce Collinson Posted November 2, 2018 Share Posted November 2, 2018 One of my club mates turned up last Wednesday with a new OS AX, I think a 75, ostensibly to run and tune it in an airframe. It was just short of two hands to get over TDC. To cut a short story even shorter, it started with a reverse flick after about 6 odd tries, ran 2 tanks perfectly happily and flew a full tank an hour later. I believe the protocol is to get them hot ASAP then run rich for a tank, gradually leaning out. Whatever, it was very tight and it runs very well. Hope this gives you some comfort. Is it about tapered cylinders in ABC engines? BTC Quote Link to comment Share on other sites More sharing options...
Don Fry Posted November 2, 2018 Share Posted November 2, 2018 I though the protocol is open it up, tune it to max, but if it starts to sag, cut and allow to cool off to cold, and start again. As soon as it hold power for 10 seconds, get it in the air, but don't let it sag, and don't do unlimited verticals, and keep moving the throttle. Quote Link to comment Share on other sites More sharing options...
Nigel R Posted November 3, 2018 Author Share Posted November 3, 2018 My understanding also. Correct mix but short bursts of load. Getting longer over first hour of runtime. All on One prop size down from normal. Quote Link to comment Share on other sites More sharing options...
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