Paul De Tourtoulon Posted October 20, 2021 Share Posted October 20, 2021 I am waiting for it to arrive, any suggestions whether its worth modifying to petrol ?. I have a spare recel ignition and a few magnets with a spare walbro carb somewhere, but no glow size plug. Quote Link to comment Share on other sites More sharing options...
FlyinBrian Posted October 20, 2021 Share Posted October 20, 2021 I am sure more knowledgeable people than me will answer shortly but I do not think it is a particularly easy thing to do and get good results. It may be worthwhile contacting Morris Mini Motors who does these conversions to various makes of engine. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 20, 2021 Author Share Posted October 20, 2021 Thanks, but those conversions cost an arm and a leg, as I don't have a plane to put it in 'yet' and with nothing much to do at the moment,,,,? It's only for the fun,,,, Quote Link to comment Share on other sites More sharing options...
Dale Bradly Posted October 20, 2021 Share Posted October 20, 2021 What are you trying to achieve? I've had great success converting glows to spark ignition with the rcxel and they run a treat. For Mei found Idle better, throttle better and run a leaner mix. But staying with methanol fuel. Note however, those ignitions tap out at about 10k rpm, so if your engine would previously Rev higher, it won't on one of them. Petrol, you're on your own. Ask Jon when he pops along with his thoughts on that. Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 20, 2021 Author Share Posted October 20, 2021 Achieve nothing really, except at 8€ the litre of Methanol against 2€ for petrol and of course what a methanol engine uses against petrol,,, I get through around 60/80 litres of petrol a year on my models. Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted October 20, 2021 Share Posted October 20, 2021 (edited) My current Enya 120 does throw its prop and no lock nut available due to short thread on shaft. You might be able to set timing to tame the prop throwing thing but will also need to lower compression ratio a little with a head shim as petrol engines usually run at lower comp . The shim also tames the glow version and it is a docile engine once a shim is fitted at the cost of a few rpm. The twin needle carb might be easier to tune for petrol but a walbro carb, if you can make an induction tube adaptor would be better. It may benefit from a carb reducer fitted in the carb barrel if using the standard carb but again will reduce performance considerably compared to glow version. All in all a lot of work to achieve lower power, but you will save fuel cost if it works. Keep us informed of progress ? Edited October 20, 2021 by Engine Doctor Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 20, 2021 Author Share Posted October 20, 2021 Thanks, my Enya 90c threw props till I made a bronze flywheel and put it in the cone in front of the prop,,, Quote Link to comment Share on other sites More sharing options...
Jon H Posted October 20, 2021 Share Posted October 20, 2021 I wouldnt bother with it. I have never seen a petrol conversion work well enough for me to be satisfied with it. Maybe my standards are higher but still. I have two of the large enya engines. One 120 (up bored 90) and one 155. Neither are thirsty beasts and they run well on low nitro fuel which is cheap to buy/make. 1 Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 20, 2021 Author Share Posted October 20, 2021 Yes probably right, but if I don't spend my time on it I will have to buy myself another plane to keep myself busy,,,? 1 Quote Link to comment Share on other sites More sharing options...
David Ovenden Posted October 20, 2021 Share Posted October 20, 2021 Paul, You can always finish off one of my planes if you don't have anything on! Tomtit, Tiger Moth, Condor re-build??? ? Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 20, 2021 Author Share Posted October 20, 2021 I was looking for another bigger Spitfire or Hurricane, both of mine only have 15cc four strokes in them,,,? Quote Link to comment Share on other sites More sharing options...
Mike T Posted October 20, 2021 Share Posted October 20, 2021 (edited) You might want to try an O.S. G5 plug. I've removed the ign. unit (and battery) from my Moki 210 (2S) conversion and replaced the park plug with one of these. All the simplicity of glow combined with the (relative) cheapness of petrol. It runs a bit lumpier at the bottom, but I haven't spent any time dialling it in. Edited October 20, 2021 by Mike T brevity... Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 20, 2021 Author Share Posted October 20, 2021 Yes maybe worth a try if I can't find a small spark plug to go into the glow plug hole,,, Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 20, 2021 Author Share Posted October 20, 2021 Rimfire and rcexl both make a 1/4" 32 unf threaded plugs,,,, all on eboot,,,,, Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 22, 2021 Author Share Posted October 22, 2021 I ran it up today, it was a bit shaky now I am looking for the threaded adapter for the exhaust it's around 15mmod fine thread, here is the nut ( not me ) any idea whether it's a 15 x 100 mm thread or what ?. thanks Paul. Quote Link to comment Share on other sites More sharing options...
Jon H Posted October 22, 2021 Share Posted October 22, 2021 DO you have the 120R or the 120-4c? they have very different exhausts Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 22, 2021 Author Share Posted October 22, 2021 A good question,,, it has a 9mm carburettor, and this exhaust in the picture, bolted on, not screwed in like my .90,,,so I guess it is the R. someone forgot to adjust the valves, no play at all,,, Quote Link to comment Share on other sites More sharing options...
Denis Watkins Posted October 22, 2021 Share Posted October 22, 2021 (edited) 11 x 0.75mm thread Edited October 22, 2021 by Denis Watkins Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 22, 2021 Author Share Posted October 22, 2021 Thanks but it is not 11mm, its over 14mm measured on the inside of the thread. I just ran it after adjusting the tappets, an Apc 14 x 7 prop on 10% nitro and 17% oil gave me 10.075 rpm and the fuel consumption is around the same as my V 8 in the garage,,,?,,, Quote Link to comment Share on other sites More sharing options...
Jon H Posted October 22, 2021 Share Posted October 22, 2021 (edited) if you have a photo of the engine it would help with identification but i suspect its the 4c version as a 14x7 is way too small for the R. I used 15x8 on my 4c and saw around 7500-8000 if i recall If you use 5% nitro and 15% oil fuel consumption will drop significantly. Mine was in a hangar 9 pulse 60 and i think they came with 14oz tanks? anyway this was good for more than half an hour if i was gentle. Edited October 22, 2021 by Jon - Laser Engines Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 22, 2021 Author Share Posted October 22, 2021 It has '52' on the left mounting lug, before I did the Tappets it turned a 16 x 6 Master Airscrew at 8050 rpm with a lot of vibration, it was new and unbalanced. Quote Link to comment Share on other sites More sharing options...
Jon H Posted October 22, 2021 Share Posted October 22, 2021 Thats an R. Savage brute of an engine with loads of grunt. I would use a 15x8 prop and expect to see around 8000-8500rpm depending on the brand. The 120 4c is not as powerful as its a bored out 90. More compact, but not with as much oomph. A friend has an escale seafire fitted with one of the R versions and its a complete animal. I have a model fitted with a 155R (a bored 120R) and it too is a beast. They do tend to rattle and shake so that is normal. He also found it ran better on 5/15 nitro/oil than 10/15. These are great engines and the only things that hold them back are their slightly weak valve gear (valve spring and rocker failures arent unknown), their out of date air bleed carbs, and their donkey exhausts which do nothing to reduce noise. What i suggest you do is make a new flanged header to fit the head/retaining plate and thread the other end for something suited to an aftermarket exhaust. Be careful though, my 155 eats exhausts for breakfast especially if they are heavy. The 120 and 155 also run really hot on the exhaust gas temperature and my 155 melted an aluminium baffle i installed in the exhaust..and by melted i mean melted, there where splatters of molten ali burned into the wing leading edge. I love these enya engines, but they are savage animals. I currently operate a 155 and a 53 on 5/15 fuel and in the past operated the 120-4c on the same. I also have a super yummy VT240 which is complete animal and laps up the 5/15 fuel. Economy is good and it nearly matches a laser 300 for power bu has a totally different character. Its a shame Enya engines are gone as they were the best of the japanese brands in my view even though their designs are very 1980's Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 22, 2021 Author Share Posted October 22, 2021 Thanks Jon, I don't want to change my fuel mix as I use it on anything and everything, all my 4 strokes, Os .61 open rocker Enya 90c HP 21vt Saitos and even my Laser,,,, and of course 2 strokes including my Raptor 50 with it's OS .50 hyper, Rossi 90 RV, os .45 etc etc etc,,,,, I with balance my 16 x 6 and see what it runs like, and see what plane to modify and try it out in,, Quote Link to comment Share on other sites More sharing options...
David Ovenden Posted October 22, 2021 Share Posted October 22, 2021 Paul, your engine's exhaust looks modified. I found these pics of a new engine and exhaust. Or perhaps yours R120 is a newer (or older) version? Quote Link to comment Share on other sites More sharing options...
Paul De Tourtoulon Posted October 23, 2021 Author Share Posted October 23, 2021 Thanks David, it's the one you have in the picture, I have taken the ring off to free the nut,,, I will be running it up again in the garden today with the 16 x 6, if you can hear it at your place just tell me,,,? It's doesn't idle for long, so I might modify my Perry carburettor and fit it to see what that does, but first a new glow plug, I have no idea what it is but it isn't an Enya 3/4 or OS F, which a few forum recommend. Quote Link to comment Share on other sites More sharing options...
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