The 'plug' at the top of the cylinder which adjusts the compression is named the 'contra-piston'. Over-compression will reduce the revs and cause overheating so it is important to start with it sliightly under compressed with it intermittent firing and increase until firing becomes even. Adjust needle valve starting with a slightly rich mixture and lean out gradually. It is advisable not to use an electric starter since it could cause a 'hydraulic lock if the fuel is too rich and the compression is too high. A sharp flick with the index finger is best with the propeller in the 10 minutes past 8 o'clock position. Diesels are great for free flight since they are happy on larger propellors at lower revs.
Yes Exactly I probably explained that poorly as I was half asleep trying to make that video since everyone was bothering me about it haha I used to fly with diesel for about 50 years before the flight near my city was banned
Pity you use the term nitro engine as glow plug engine is the correct term. I have run these engines for years on straight fuel which contains no nitromethane. Some competition classes actually do not allow it. Most diesels are not necessarily r/c as they were originally used in control line,free flight or tether cars. And many have flat top pistons as well with the contra piston having a squish area to promote better fuel burn. Diesel pistons can be made of meehanite a form of cast iron which is very stable. Generally diesel or compression ignition engines have reverse flow scavenging whereas glow engines use Schnuerle porting nowadays.
Yep I completely understand how it works it's just the thing is most younger generation these days do not understand what a glow engine is they are familiar with the term Nitro engine just making it easier for people to understand since I keep getting the same questions over and over again of what's the difference between the two witch is absolutely nothing other than the name the rc car seen and There is no Nitro or glow RC car competition that suggests running 0% that's just something for airplane use or if you feel like experimenting and having fun on the weekend.
Only difference is the rc car glow plug Continues to burn after it started due to the catalytic reaction with the fuel. The Nitro engines are only about 8:1 compression
Between a glow plug engine and an rc diesel engine of the same displacement, does the diesel have significantly higher torque? Between a glow and diesel engine, which has the best engine efficiency ? Thanks.
The Diesel makes less rpm and more torque and as far as fuel efficiency the Diesel wins in that area as well. Sadly no companies are making Diesel rc engines anymore because people couldn't understand how to operate them and you have to make your fuel witch can be difficult depending upon your area to find the chemicals needed
@@thebug4046 Certainly yes. But the stoichiometric combustion ratio of methanol is 6.5:1 and nitromethane 1.7:1 so more fuel can be burned per revolution of the piston i.e. more power obtained, this is why some top dragsters fuel can reach 10,000hp, which limits diesel engines. But for diesel engines, the greater energy density of kerosene means that they can run longer with the same quantity of fuel and the high compression achieved in the engine allows high torque and better fuel efficiency to be achieved. Do you think like that ?
I'm glad you know how the glow plug system works and described the catalysis of the plug with methanol. But please.. I hate the term nitro engine... they are glow engines, not nitro engines. That is a lame term that came into use around the '90's in RC car ads. Airplane folks never used it. Well, anybody that got in to the hobby since then uses the term which is a real giveaway.
Unfortunately not. There was an attempt about 20 years ago but it didn't work out. People didn't understand how to start out tune them and they didn't make as much RPM as the Nitro engines
@@thebug4046 aw that sucks do you know any RC Glow engines that have the sound of a like 302 v8 or 300 L6 instead of that chainsaw/weedwacker sound with a higher pitch if there is any that sound more like a truck?
@@HowardDiesel1yup they use pump Diesel castor oil and MEK mixture and light the fuel only by compression. They are in fact a real Diesel with adjustable compression.
Does most brands of starting fluid work for this? I cant find the jhon deer kind that people say have high ether %. I have a 13 yrs old diesel that was made by some old man who is probably dead now the engine sat in my tool box for yrs, i took everything apart and cleaned it out, piston has rust on it, and when i cleaned and lubed it up i was supprized at how much compression it had, there was so much rust thatbate through the metal on the sides of the piston thatbi thought there would be no compression at all. Anyways there's something fun about trying to bring an old engine back to life again I'm sure the bearings are shot in this but I want to run it until it self destructs at least or cleans itself and polishes back out from running it, Maybe the piston will smooth itself back out. Anyways I mixed up 28% 927 caster oil with 32% kerosene and 40% ether starting fluid and its not working. I know there is plenty of compression in this engine so im guessing itsbthe starter fluid maybe not having enough ether? Please help. Also I did not use any Ignition booster should I use that too?
Hey yes if you can get the jonder starter fluid or anything with at least 50% you're good to go Hey yes if you can get the jonder starter fluid or anything with at least 50% you're good to go! Other brands will work but if the % is to low they will be a nightmare for starting
@@thebug4046 so for the last hour ive been spinning this motor non stop, i used a flywheel, maybe to much weight but even tried a drill spinning th nut, got it to smoke a little but doesnt sound like it wants to keep popping with the drill on it, and its not sucking up fuel into the line when i spin the engine fast both ways so i just pour it in the intake hole, do you buy any chance know how to tell what roatation this is supposed to spin or does it not matter on a 2 stroke?
That screw moves the compression ratio a little but that isn't what is making the power.... that actually advances and retards the timing because the mixture hits that temp sooner. That's what makes the power lol your welcome guys. I know it's easy to compare a gas engine concept to diesel but it's two different engines.
I do have a question tho.typically if you have a diesel and gas engine that are same size then the diesel gets better fuel mileage. These smaller engines crank out 12k rpm... So my question is which is better on fuel consumption at a cruising speed? Nitro, gas, or diesel? I built a mq9 reaper with fpv and uhf long range. Obviously not wasting time on electric on that kind of build lol
Charlie india alpha honestly I have not compared all three at the same time but people tell me that the Diesels are more efficient then Nitro or gas so I'm not sure they're all a two stroke engine which require a lot of fuel then you have to take him to consider fuel densities oil concentrations all that other fun stuff so honestly man I have no idea all I know is I really enjoy playing with these
@@captainsledge7554 with what is available on the market today, I'd ne looking at a spark ignition petrol engine, and depending on the power you need, two stroke the Four stroke petrols are amazingly efficient. Morris mini motors make and sell convertion kits to change all sorts of model glow engines to petrol.
No you can't it's only for airplane engines that require Diesel mix it's also a mixture of chemicals that are sometimes Illegal. For rc cars use the Recommended nitro fuel
You don't have to spend a million to have fun I often buy a complete used rc car for cheap clean it up get it running and giver! My last one was 40$ I'm into it for 20$ for a battery pack and glow plug just gotta keep your eyes peeled on sales pages
@@thebug4046 I will do. I subscribed to the channel for moral reasons. Nitro & Beer is God's way. Spend a lot of time inspecting beer cans for defects and then creating them with my pistol. I will keep watching.
@@cyclicracer I went to drones/quads whatever their called this week. Have a Eachine E58 & Visuo that's a Mavic clone. I got a hell of a lot of exercise learning to fly one. Beginner drones don't exist. But I did learn. :)
Another great video.can you buy Ether in a bottle .what’s the best way to decompress a starter fluid can lmbo. I’m guessing just spray in a empty bottle.yea I live in the woods .you was mixing up ten ounces of fuel ? I heard someone say don’t mix up more than you can use In a day I guess. Ether evaporates pretty quick . I got two of them Diesel engines I’m fixing tinker with.ones a map3 2.5 and the other is a uctkam
Hey Yes that's what I do is usually makes up about 6 oz equal parts ether kerosene and Castor oil and a little bit of diesel cetain booster 30/30/30 mix in a glass jar With a very tight sealing lid preferably a Mason jar And yes it's not really a great idea to mix up more than you really need because it can evaporate even through plastic I have noticed but usually it's fine to keep for about 6 months in a Mason jar make sure it's out of direct sunlight use a good quality Castro oil like klotz And as far as Deacon pressing back the compression adjustment all the way out and then prime the cylinder an attempt to start the explosion will kick the contra piston up as far as it will go and then you can start in small increments check out Velic000 on RU-vid he is the Diesel master! I know him well And just take safety precautions when using ether because it is very explosive make sure you are out in a well ventilated area
@@zahariburgess3660 won't work You need ether Number 2 ethylhexyl nitrate kerosene and Castor oil it the right mixture or it will not work or you will blow the engine this will only work with compression engines will not work with glow engines
