Smallest Fuel Injector

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Heather Mitchell

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Aug 3, 2024, 2:33:03 PM8/3/24

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Last week, a partnership between Lweheiser xtech startup and the pioneer UAV manufacturer Quaternium was announced, which led to the achievement of a new world record of multirotor endurance with an outstanding flight of 10h and 14 min. The EFI company has developed a state-of-the-art fuel injection system and, combined with a world-leading drone-like HYBRiX, they were able to get the most advanced power system in the industry.

Before UAVs were adopted, many of these small engines have been used in radio-controlled aircraft. In general, they used carburetor engines for low cost and simplicity. Compared to hobbyist purposes, UAV performance has higher standards and demands. Nowadays, drones are exposed to harsh weather conditions and high altitudes while carrying heavy equipment for more than 2 hours. All these engines, no matter brand or displacement, have something in common to answer those claims: they require a high reliable EFI system.

Lweheiser is a company that focuses on electronic fuel injection conversion kits for UAV engines. The startup said they develop the smallest and most reliable fuel injection system in the market. This EFI ensures optimum engine performance, lower consumption and capability of adapting to a wider range of altitudes for 2 stroke, 4 stroke and wankel engines.

Lweheiser specializes in developing individual settings and solutions to suit client needs, based on their specific requirements. If you are interested in knowing more, contact Lweheiser expert team at www.loweheiser.com

Currawong has designed a range of fuel injectors to suit small fuel injected engines. These fuel injectors offer the benefits of high reliability as well as highly atomised fuel to improve engine efficiency.

In 2019, Currawong released the CE1494 fuel injector, offering similar versatility in a more compact package. It is used on the Corvid-50 engine and can also be used on larger engines. The CE1494 is secured with a retaining cap which also integrates the barbed 4mm fuel line connector. Flowrates are also customisable to suit a wide range of engine capacities.

This weld-on fuel injector bung is used mainly in forced induction applications, welded to the charge pipe before throttle body in most cases.
With more vehicles using Methanol and E-85 fuels, these have become a popular way to get more fuel in your engine without the cost of huge primaries. It also allows you to spray near or at the turbo compressor.

Fuel injector seal small for GTV/6, Milano, and Spider with Bosch fuel injection 1982-94. This small injector seal fits around the tip of the injector. See part number FI129 for the larger injector seal used to locate the injector.

Photographs are intended as illustrations only and actual product may differ from photograph, and may change without notice. Alfa Romeo part numbers are listed for reference only and do not indicate parts are original equipment. Prices are subject to change without notice, and some items do not qualify for discounts or special offers. Inventory levels may change quickly and products listed as In Stock may be out of stock or backordered. Individual components of a discounted "kit", all books, manuals, and wiring diagrams, and all electrical components (including ignition and fuel injection components) are non-returnable. Special Order items may not be cancelled or returned for any reason. For more information please refer to our Store Policies page.

Here is a really important concept to consider - A few years very few tuners in the standalone tuning market knew what a 'short pulse width adder' was. About 15 years ago few people knew what injector deadtime was and some ECUs didn't even compensate for it (some sadly still don't).

Now we have an ever increasing amount of data all aiming to increase the accuracy of our tunes. Each additional parameter makes increasingly smaller gains in this accuracy. Don't get me wrong, it's all great data and it does improve the situation but we also managed to tune cars and get quite acceptable results when we didn't know this stuff existed or couldn't utilise it even if we had it.

So in short what I'm saying is if you have the data then use it. If you can find the data then hunt it out and use it. If however you don't have short pulse data, set this table to zero and be happy in the fact that your engine will probably still run quite happily. You will end up tuning around the non linear area of injector flow with the numbers in your fuel / VE table and it may end up looking a little funky as a result.

If you're reflashing a factory ECU that includes a short pulsewidth adder table then this does present a larger problem as you usually aren't tuning a fuel table or VE table as such and hence can't fudge these tables to account for the injector linearity. In this case the ECU is relying on the input from the MAF sensor and the target AFR table primarily. The result of not having the correct short pulse width adder data is that the closed loop system may end up working slightly harder at low pulse widths to achieve target. Unless you've got a really terrible set of injectors though, this shouldn't present a large issue though. Also remember that the non linear area of flow typically only extends to 2-3 ms so you are only going to be in this area at idle and very low rpm / light load.

My advice would be try it and test the results to see how the car performs. If you can't get an adequate result explain this to the customer and what the implications will be. It can then be their decision as to whether they source the right data/better injectors or accept the results.

Man that is great info! I have just installed these same injectors durring a fuel system overhaul and am not so patiently waitng to get the rest of my parts installed and finally get to hear my new to me Chief make some noise!

I am very sorry to revive a very very very very very very very very very dead thread, I just wanted to see if everyone thinks these injectors are the best for my Renix 4.0 or if there is a better alternative.

Probably would have been just as informative to start a new thread and get comments from people who have done this in the last couple of years. Not bashing you at all, just a suggestion. That said, Bosch 746 injectors IMO seem to be the most widely used injector upgrade on the Renix 4.0 and I have yet to read a negative comment across many forums. Affordable, readily available, properly spec'd for flow rate etc.........best upgrade I've done. Instant improvement in smoothness of idle and acceleration. I believe I gained some mpg but I have not measured it in great detail, just getting more miles per tank.

Did this swap a couple of years ago. Noticeable improvement in idle and smoother and better acceleration. Nothing mind boggling but noticeable. Can't speak to mileage as I didn't do a before and after.

No problemo. Gotta do something with this day and I can't go outside, smokes too thick. I'm not too far from the now largest wildfire in CO history. Cameron Peak. Gotta wear my P100 mask just to go outside. Nasty.

The key to getting a set is to make sure the seller has not just cleaned them up with new orings and filters, but has tested and flow-matched them for consistent pressure across all 6 injectors. There is a guy on either NAXJA or CherokeeForum that has been rebuilding them for years, Cruiser knows the guy I believe and can refer you to him but not sure if he is still doing them. Otherwise I would recommend ebay so you can see better feedback and a more detailed description to make sure they are flow matched. For me, Amazon doesn't give me as much confidence as ebay on things like this. Another option that will cost you a bit more but you're getting a known product with proper rebuild and flow matched is KSuspension. I've heard they are good to deal with and very fair if you have any problems also.