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Model Forum / Radio Controlled / Air Models / July 2008Super tigre G51not firing up
I have a G51 that feels like it has almost no compression (it was given to me as a freebie by a friend). It is fairly new and on disassembling the piston/liner look fine with no scratches or other obvious signs of wear. I have tried getting it to run (using 10% coolpower) and an APC 12*6, but have had no success so far it will barley even fire up let alone stay revving to allow some kind of tuning. I've never had a ringed engine before so I'd like to know should I give up on it or is there something I can try to get it running? All help/advise gratefully appreciated. PS I have installed a new Enya no.3 plug but no change. Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge: > I have a G51 that feels like it has almost no compression (it was given to > me as a freebie by a friend). It is fairly new and on disassembling the [quoted text clipped - 8 lines] > > PS I have installed a new Enya no.3 plug but no change. It is a ringed engine. Ringed engines have less STARTING compression than non-ringed engines. Make sure that the rings are free in the piston grooves. I have also found that the ringed engines I have require what "seems to be" an excessive amount of fuel to get started (you almost think you are flooding the engine) so as to help "seal the ring". Ringed engines REQUIRE a LOOOOOONG break in period to get the ring seated properly. Once broken in you should have no problem hand starting a ringed engine. Until they are broken in I suggest using an electric started. > Ringed engines REQUIRE a LOOOOOONG break in period to get the ring > seated properly. Once broken in you should have no problem hand > starting a ringed engine. Until they are broken in I suggest using an > electric started. If it's a G51, it's probably been run to hell and back, and the ring is worn out. Replace the worn piston ring with a new one, and start the breakin process from the beginning. Check the ring. I had a brand new G51 with no compression and I couldn't start it. All the 'experts' at the club told me it was because it was a ringed engine and they are much looser than ABC types. I rang Thunder Tigre support and they told me all sorts - it's meant to be like that. I was using the wrong fuel. I was using the wrong plugs. I need to change the angle of the spraybar etc. All to no avail. They eventually rather grudgingly agreed to have a look at it. I sent it back and it was with them for weeks before they even looked at it. They found that the ring was 'missing'. When they returned it they had lost my box and packed it in a tatty 60 engine box instead. So they had wasted loads of my time, expense (different plugs, fuel, postage) and they didn't even grace me with an apology. It's never been a great engine. Still got it but have never managed to get a nice low tick-over so put up with a fast idle. Needless to say, it was the first and last Super Tigre that I ever bought. Cheers, Nigel Ring is definitely there! I'll try starting with a starter having flooded the engine with fuel as suggested by Ted. I'll keep you all posted on the results. Thanks everyone for you input so far. Gerry > Check the ring. > [quoted text clipped - 23 lines] > > Nigel > Ring is definitely there! I'll try starting with a starter having flooded > the engine with fuel as suggested by Ted. I'll keep you all posted on the [quoted text clipped - 31 lines] > > > Nigel ...and as has been stated many times before on this forum, if you are using the stock ST plug, throw it away and put in an OS8. The difference is night and day. You will also need to run about a gallon of fuel through it before it really starts to purr. Be patient and you'll end up with a fine running engine that will give you years of trouble free service. --Mark > Ring is definitely there! I'll try starting with a starter having flooded > the engine with fuel as suggested by Ted. I'll keep you all posted on the [quoted text clipped - 32 lines] >> >> Nigel No, don't "flood" the engine. In modeling terms flooding means that the engine is too rich to start. That will put you right back where you started from, which means that the engine won't start. Gasoline engines require gasoline drips from the carb. Glow engines will be flooded if you use the same strategy and will not start. You can even bend or break the connecting rod if you insist on trying to start a glow engine when it is flooded. What the other fellow was saying is that it wouldn't hurt to prime the engine a little more than you would a ringless engine. Jack Ted shuffled out of his cave and grunted these great (and sometimes not so great) words of knowledge: > Ring is definitely there! I'll try starting with a starter having flooded > the engine with fuel as suggested by Ted. I'll keep you all posted on the [quoted text clipped - 3 lines] > > Gerry Gerry, I didn't say flood the engine. What I said was: "I have also found that the ringed engines I have require what "seems to be" an excessive amount of fuel to get started (you almost think you are flooding the engine) so as to help "seal the ring"." >> Check the ring. >> [quoted text clipped - 23 lines] >> >> Nigel > Ted shuffled out of his cave and grunted these great (and sometimes not so > great) words of knowledge: [quoted text clipped - 15 lines] > be" an excessive amount of fuel to get started (you almost think you are > flooding the engine) so as to help "seal the ring"." ------------ Just for the record, I was not implying that you were saying to flood the engine either. Nigel was using the term incorrectly, which I was trying to point out. Ed Cregger > Check the ring. > [quoted text clipped - 23 lines] > > Nigel That isn't typical behavior for a Super Tigre engine. What is your idea of a tick over idle? About 2k to 2.3k rpm is nominal. Some four-strokes will idle a bit lower as will some really big two-strokes (all glow engines). Prop size and weight does matter when it comes to idle speed too. You can buy whatever you please. That's fine with me. But you will be cheating yourself by not experiencing more Super Tigre engines. Jack Could never get mine below 2.7K-3K. I'm not a novice either I've run 10 or more engines in my time and not had any problem with any of them. Don't get me wrong, I still use my ST, it's in a Big Stik 40 at the moment and performs very nicely at the mid and top ends. Just have to get used to faster than normal landings. And I've given up looking for leaks in the engine, piping, carb. Cheers, Nigel > Could never get mine below 2.7K-3K. > [quoted text clipped - 10 lines] > > Nigel ____________ You have an air leak somewhere, Nigel. Loose cylinder head, loose backplate, leak at the carb junction or possibly an out of spec (too large) crankcase bore of the crankcase. That is not a typical Super Tigre difficulty. Fortunately, even if it is the crankcase, that will be inexpensive to repair. Ed Cregger |
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