Olly P Posted June 10, 2009 Share Posted June 10, 2009 All, I have been trying to get my SC 46 running in the Hornet. I have managed to get her to run for a short period of time if I partially cover the exhast vent (presumably increasing pressure in the fuel tank), but as soon as this is released she revs up, coughs and dies. I have therefore stripped out the fuel tanks and checked it over, cleaned all the lines and carb with meths, and had a good look at the clunk. When I inspected the clunk and tried the 'blow' test it seemed blocked, I have now cleaned it with the meths and it will allow a flow, but it is very limited - when I look closely into the fuel line end of the clunk there appears to be a seperate brassy piece attached to the main body with some small holes in it, I think these are restricting the fuel flow. I haven't tried to turn the engine over since cleaning the clunk, but will do so when i get a 12V supply to power my starter. Any ideas why the original problem and if the second piece inside the clunk is 'normal' I will try and get a photo and post it later. Edited By Olly P on 10/06/2009 11:38:25 Quote Link to comment Share on other sites More sharing options...
Stephen Grigg Posted June 10, 2009 Share Posted June 10, 2009 Could it be a fiter that may be blocked Quote Link to comment Share on other sites More sharing options...
Olly P Posted June 10, 2009 Author Share Posted June 10, 2009 Thought that but doesn't look like a filter, more like a little brass block with some very small holes in it, very peculiar. Quote Link to comment Share on other sites More sharing options...
Delta Whiskey Posted June 10, 2009 Share Posted June 10, 2009 Use a chicken stick and try and fire it up to see if you have managed to clear it? Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted June 10, 2009 Share Posted June 10, 2009 sounds like a bronze style fuel filter. Quote Link to comment Share on other sites More sharing options...
Olly P Posted June 10, 2009 Author Share Posted June 10, 2009 DW, Will try when i get back to the mess tonight. Timbo - could be, is the meths method the way to clean it? Is there a better way? Quote Link to comment Share on other sites More sharing options...
Olly P Posted June 10, 2009 Author Share Posted June 10, 2009 To the mess, tea and toast, mount engine and test out. will report back later! Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted June 10, 2009 Share Posted June 10, 2009 I just flush em out with clean fuel TBH - having siad that I filter my fuel 4 times BEFORE it gets to the tank, and use no inline filters on the model at all - more PPOF IMO Quote Link to comment Share on other sites More sharing options...
Olly P Posted June 11, 2009 Author Share Posted June 11, 2009 Thanks Timbo, I'll bear that in mind. This is the fuel system that came with the model and I think may be why it has never flown (from the look of it) I have tried to start it with a now cleaned fuel feed system, and it doesn't ignite. I will try a different fuel feed tonight (I'll rig something up that'll work) The clunk appears to be clear but still seems to be the slow point in the fuel feed. I tried to get a decent photo of the brassy bit but it is too shadowed by the clunk outer. here are a couple of photo's of the system anyway. I am strongly tempted to get a different clunk. All help appreciated! Olly Quote Link to comment Share on other sites More sharing options...
Klippy Posted June 11, 2009 Share Posted June 11, 2009 Hi Olly, remember that the fuel flow through the filter isn't all that much. It sounds as though you have a 'sintered bronze' filter, (I may have the name wrong) try pumping fuel backwards through it, about an eggcup full, discard that fuel and then try again. Quote Link to comment Share on other sites More sharing options...
Tim Mackey Posted June 11, 2009 Share Posted June 11, 2009 Sintered bronze is indeed the correct term Tony. However the item pictured by Olly is not such a beast. It is a regular metal clunk and should not be a problem. I suggest replacing all fuel lines with new silicon tube, ensuring no air leaks in the system, and checking that the needle valve is correctly set ( SCs tend to have them set around 1.5 turns out ). I have now just 1 x IC engine left in my fleet, but its an SC and runs sweet as a nut, every time. I just think you need to check EVERYTHING carefully, put a nice shiny new glowplug in, clean fuel etc and all should be fine. Edited By Timbo - Moderator on 11/06/2009 12:42:42Edited By Timbo - Moderator on 11/06/2009 12:46:40 Quote Link to comment Share on other sites More sharing options...
Olly P Posted June 11, 2009 Author Share Posted June 11, 2009 I'll try it with the irvine 40 I've got and see if she'll spin up... Quote Link to comment Share on other sites More sharing options...
Olly P Posted June 12, 2009 Author Share Posted June 12, 2009 Irvine spun up, dead easy. think it must be something with the engine. Joy. Quote Link to comment Share on other sites More sharing options...
Martin Harris - Moderator Posted June 12, 2009 Share Posted June 12, 2009 I can't see the brass bit you referred to earlier but if the other engine works OK you can discount this anyway. Have you checked that the idle needle hasn't been screwed in too far? Forcing fuel in by pressurising the tank would temporarily richen the idle mixture giving your symptoms. Quote Link to comment Share on other sites More sharing options...
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