|
|
|
Discussion
Electronic Fuel Injection (EFI) for RC engines.
Hello,
I am working on an injection system for small engines, mainly 2T engines. Originally it was thinked for UAV. In my experience it is almost essential for unmanned because customers have no experience with carburation and many times there is no chance to make a test flight and it is absolutely mandatory if you need to reach high altitude from takeoff. In RC does not provide a clear benefit, carburetors works great and are cheap. you donīt need fuel efficency, you donīt need reach high altitude... Even so it is possible that it have some advantages: - maybe an increase in power because you can use a bigger throttle body. - no need needles adjust - don't have choke - no throttle link ... Advantages or not advantages EFI seems the future, all 2 stroke dirtbikes come with EFI this year, Stihl is making its fuel injected chainsaw... Maybe it's time to move on to fuel injection? What do you think are the best to convert to EFI? http://www.loweheiser.com/ |
|
|
|
|
This is my throttle body design, it is 31mm between centers (most popular walbro hole to hole dimension)
|
|
|
|
EFI Controller
And the controller, it is very small.
|
|
|
Joined Aug 2014
343 Posts
|
You're right, not required for RC as the carbs are pretty good. However, most of our engines have points in the rpm range where the mixture is bad enough to cause 4 stroking, stumbling, etc. Being that EFI allows mixture adjustment throughout the rev range that would be the advantage. I think price has to be reasonable for wide spread adoption though...there are a couple viable systems around but they are thousands of dollars.
|
|
|
|
I am all ears, I think the carbs suck (pun intended). I fly in temps from 20F to 100F and would love to never deal with a carb ever again. EFI may not have more PEAK power, but the throttle response, idle quality, mid range and ease of starting are all significantly better when the EFI is correct. This is probably most practical for 60cc and up, I would love to have this for my DA-120!
|
|
||
|
Quote:
|
|
|
|
United States, MO, Fenton
Joined Jan 2015
768 Posts
|
No clue on the cost side of things but I wonder how much better fi could be if they utilized a closed loop system? Kind of figured that Horizon probably gave up on theirs because they couldn't get a good map. Just seems like a closed loop would be easier to map? Of course I have no experience with this sort of thing. Just thinking out loud.
|
|
|
|
great, so I have to search a 120cc engine and start to work!
FGNewbie, I think horizon was working with a company called PCRC Products, they have a nice efi system, very compact, everything is the the same assembly, throttle body, injector, regulator, controller... I talk with the guy, James, he seems not interested in small quantities, he seems tired of small projects, UAV and so on. We did not do anything. I do not know why they canceled that project, but maybe they were another kind of problem besides the technicians. |
|
||
|
Quote:
|
|
|
|
|
Yes, I will start with a DLE 111, this is cheaper to start and it's similar engine. A friend will lend me to do the experience.
The carburator of this engines seems the WJ71, I'm thinking of replacing it with a 22mm throttle body. This will deliver a little more power, I attach a picture that shows why |
|
|
|
I did not see a price list, but the 120cc version seems like it is done.
http://www.ecotrons.com/files/Ecotro...r%20DLE120.pdf |
|
|
|
Gotta get an EGT sensor into the system
|
|
|
|
There could be a big advantage to running something like this for competition (IMAC). I fly at fields from 400' elevation to 4000'. Having to not deal with adjusting the carb to get peak performance would be great.
Pull the idle stop screw and throw it away. Don't include the servo as part of the setup. The analog servo pictured is absolutely useless. Make them to fit a DA 150, 170, 200, and 215. Then you might be onto something. |
Currently Active Users Viewing This Thread: 1 (0 members and 1 guests) | |
Thread Tools | |