cymaz Posted January 17, 2014 Share Posted January 17, 2014 I suppose you could bolt THIS on then fix foam to it Or HERE Edited By cymaz on 17/01/2014 13:48:04 Quote Link to comment Share on other sites More sharing options...
Doug Ireland Posted January 17, 2014 Share Posted January 17, 2014 Hi guys, I noticed (page 2) the video of the Evo engine running with a pressure feed to the tank. I was under the impression that this was a no-no with petrol engines. I certainly don't do it with mine. Quote Link to comment Share on other sites More sharing options...
Lee Damms Posted January 17, 2014 Share Posted January 17, 2014 Hi Doug, The 10, 15 and 20cc evolution engines do not have a standard walbro carb and do indeed use muffler pressure according to the manuals. Having said that I've seen some people on youtube running the 10cc without the feed to the silencer. Regards Lee Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted May 17, 2014 Share Posted May 17, 2014 Well I finally got to fly the Evo 10 with the ASP 52 muffler & wow what a difference......it runs as well as ever, throttles beautifully & sounds like a quiet glow engine....the muffler really takes the bark out of the exhaust note. I'm running a 12x6 prop & getting 10,200 rpm which tugs my HK Soar 40 around very nicely. I did try an 11x7 thinking its got similar power to a 46 so lets try a 46 sized prop & it was no where near a good....the revs increased slightly but the performance of the model was worse......I wonder if the silencer might hold it back a bit at high rpm or (more likely in my opinion) its in a fairly "soft" state of tune & works better at lower rpm to keep the noise down..... I flew the engine flat out for pretty much the entire 10 minute flight & there was no sign of overheating......a very worthwhile "modification" to the GX10 IMHO.....I commend it to you. ASP52 Muffler here.... Quote Link to comment Share on other sites More sharing options...
Lee Damms Posted May 17, 2014 Share Posted May 17, 2014 Hi Steve, Am I right in assuming that the ASP muffler has a baffle just prior to the centre section? this could be the reason for the reduced noise level. My Evo 10 doesn't have a baffle. Regards Lee Quote Link to comment Share on other sites More sharing options...
Steve Hargreaves - Moderator Posted May 17, 2014 Share Posted May 17, 2014 It does indeed Lee.....a simple plate with a few 'oles punched in it. It sits either just before or just after the shiny section, I can't remember. I'm sure you could make one to fit the Evo silencer but given the cheap price of the ASP muffler I'm not sure its worth the hassle..... Quote Link to comment Share on other sites More sharing options...
cymaz Posted May 17, 2014 Share Posted May 17, 2014 My Evo 33gx past the noise test inthe end. I used the largest size prop recommended and had to block off on of the exhaust tubes. By the way, the exhaust is muffled or has baffles. The exhaust tubes sit right up into the exhaust chamber and have about 12 holes drilled into them. Closing off one of the exhaust tubes has not effected the power or caused any overheating. Quote Link to comment Share on other sites More sharing options...
Lee Damms Posted May 17, 2014 Share Posted May 17, 2014 Hi Steve, the muffler looks just like the ones on the Irvine 53's I may nick a baffle out of a spare and try it. Regards Lee Quote Link to comment Share on other sites More sharing options...
Sigh Posted July 2, 2014 Share Posted July 2, 2014 I bought the evo10cc and now I am trying to install it to a seagull texan (harward). Today I worked a little on the fuel tank. I used the supplied viton tubing and the clunk. But the clunk is not heavy as it should be because it stays in the air. The tubing is so stiff. I tried with tygon tubing too it is better but still very stiff how did you do the tank installation Quote Link to comment Share on other sites More sharing options...
cymaz Posted July 2, 2014 Share Posted July 2, 2014 The proper Tygon has the name and product number all the way down the outside of the tubing. If it just plain yellow it is not the proper stuff. I fitted proper Tygon tube with a heavy stainless Steel clunk and all is well. Edited By cymaz on 02/07/2014 20:20:56 Quote Link to comment Share on other sites More sharing options...
Sigh Posted July 3, 2014 Share Posted July 3, 2014 So you didn't use the supplied clunk. Since 10cc needs a smaller tank and the smaller tank needs a shorter pickup tube with the not so heavy clunk the result is not good. I guess I need to replace the clunk. I'll post a picture too. Quote Link to comment Share on other sites More sharing options...
Sigh Posted July 3, 2014 Share Posted July 3, 2014 Quote Link to comment Share on other sites More sharing options...
Sigh Posted July 3, 2014 Share Posted July 3, 2014 Don't know why the photo is upside down. Quote Link to comment Share on other sites More sharing options...
cymaz Posted July 3, 2014 Share Posted July 3, 2014 That's not good, thin walled Tygon should do the trick. Edited By cymaz on 03/07/2014 06:49:52 Quote Link to comment Share on other sites More sharing options...
Clive Hall Posted July 16, 2014 Share Posted July 16, 2014 I had similar troubles with short Tygon tubes supporting a clunk, and not reaching the bottom of the tank. Then I left the fuel in a tank for a few days and the Tygon softened. Now it flops around the tank as it needs to. I now use this as standard practice. Only a small amount of petrol is needed to keep the clunk tube flexible. However if it dries out it becomes very stiff again. Quote Link to comment Share on other sites More sharing options...
Sigh Posted July 17, 2014 Share Posted July 17, 2014 I'll use a heavier clunk. It is not filtered but there is filter on the way. Quote Link to comment Share on other sites More sharing options...
Sigh Posted July 17, 2014 Share Posted July 17, 2014 There's another think occupies my mind. I am installing the 10cc engine to 46 size plane. The 10cc evo is converted from a 60 size engine. So it is like installing a 60 size engine+ignition module+ignition battery+heavy cables. Is it an overkill. Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted July 17, 2014 Share Posted July 17, 2014 The 60 is a 'small-block' engine, not what we think of as 60 size these days - pretty much the size of a modern 40-55 glow. I'm using around half of an 8oz tank for an easy 10 minutes flying so tank size is really only restricted in how small you go by getting the short clunk line to flex enough. Weight saved in tank and fuel (and the bulk) make up for the ignition unit which just leaves the battery and a rather awkward ignition lead. An 1100mAHr LiFe pack doesn't take up much space or room. Now how many models end up nose heavy? Very few. Not so bad really, Quote Link to comment Share on other sites More sharing options...
Sigh Posted July 17, 2014 Share Posted July 17, 2014 Your post really comforted me. Thank you Quote Link to comment Share on other sites More sharing options...
Bob Cotsford Posted July 17, 2014 Share Posted July 17, 2014 68" 7lbs and plenty of power on a 13*6 APC for conventional aerobatics. The ignition is under the blue foam, an 8 oz tank goes in above it. That's quite a slim nose! Quote Link to comment Share on other sites More sharing options...
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