Carb vs Injection - Zenith Aircraft Builders and Flyers2024-03-29T14:37:51Zhttps://zenith.aero/forum/topics/carb-vs-injection?commentId=2606393%3AComment%3A756472&feed=yes&xn_auth=noI am looking at the fuel inje…tag:zenith.aero,2021-09-19:2606393:Comment:8478522021-09-19T19:16:13.332ZArnie Minearhttps://zenith.aero/profile/ArnieMinear
<p>I am looking at the fuel injection as my best option. The system I am getting doesnt have the hot start problem since it only injects on the cylinder that is getting ready to fire. I believe the recirc line will remove vapor from the hot engine compartment through recirculation by running the pump a little bit before starting. No carb heat, no mix adjustments, improved performance and eff.</p>
<p>I am looking at the fuel injection as my best option. The system I am getting doesnt have the hot start problem since it only injects on the cylinder that is getting ready to fire. I believe the recirc line will remove vapor from the hot engine compartment through recirculation by running the pump a little bit before starting. No carb heat, no mix adjustments, improved performance and eff.</p> The simpler it is the less th…tag:zenith.aero,2021-02-03:2606393:Comment:8117482021-02-03T22:02:26.233ZDavid Krakowskyhttps://zenith.aero/profile/DavidKrakowsky
<p>The simpler it is the less that can go wrong.</p>
<p>The simpler it is the less that can go wrong.</p> If anyone else is interested,…tag:zenith.aero,2020-10-22:2606393:Comment:7562442020-10-22T16:18:55.497ZMark Pensenstadlerhttps://zenith.aero/profile/MarkPensenstadler
<p>If anyone else is interested, I found this short article written by Stein Bruch on the VAF website. <a href="https://vansairforce.net/engines.htm" target="_blank" rel="noopener">Click on the link</a> and scroll about half way down...</p>
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<p>I think I'm sold on the carb.</p>
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<p>If anyone else is interested, I found this short article written by Stein Bruch on the VAF website. <a href="https://vansairforce.net/engines.htm" target="_blank" rel="noopener">Click on the link</a> and scroll about half way down...</p>
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<p>I think I'm sold on the carb.</p>
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<p></p> Thanks for the insight John.…tag:zenith.aero,2020-10-22:2606393:Comment:7564722020-10-22T13:49:33.917ZMark Pensenstadlerhttps://zenith.aero/profile/MarkPensenstadler
<p>Thanks for the insight John. At this point I'm leaning towards the carb. On this airplane I'm after simplicity, lightness, and well, cheapness! It looks like good fuel injection systems are fairly pricy. My Mooney had a carb and I've never had any issues with it. </p>
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<p>I also like the idea of a much simpler fuel system too. </p>
<p>Thanks for the insight John. At this point I'm leaning towards the carb. On this airplane I'm after simplicity, lightness, and well, cheapness! It looks like good fuel injection systems are fairly pricy. My Mooney had a carb and I've never had any issues with it. </p>
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<p>I also like the idea of a much simpler fuel system too. </p> Thanks Clint-simplicity is wh…tag:zenith.aero,2020-10-22:2606393:Comment:7564052020-10-22T13:46:59.124ZMark Pensenstadlerhttps://zenith.aero/profile/MarkPensenstadler
<p>Thanks Clint-simplicity is what I'm after I think. Especially since I could be by myself in the back-country. I like the idea of not having to rely on pumps and batteries to make everything work.</p>
<p>Thanks Clint-simplicity is what I'm after I think. Especially since I could be by myself in the back-country. I like the idea of not having to rely on pumps and batteries to make everything work.</p> I have an AeroInjector carb (…tag:zenith.aero,2020-10-22:2606393:Comment:7563982020-10-22T13:10:16.662ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>I have an AeroInjector carb (confusing name - it is a throttle-body carb and NOT fuel injection!) on my Jab 3300 and love the simplicity. I think for the recreational/experimental flyer, one can never go wrong with the KISS (Keep It Simple, Stupid!) philosophy. (That's also why I like the Jab - air-cooled, direct-drive, put gas and oil in it and it once you start it, it'll keep running even with no battery!) </p>
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<p>I also had years and thousands of hours ownership experience with…</p>
<p>I have an AeroInjector carb (confusing name - it is a throttle-body carb and NOT fuel injection!) on my Jab 3300 and love the simplicity. I think for the recreational/experimental flyer, one can never go wrong with the KISS (Keep It Simple, Stupid!) philosophy. (That's also why I like the Jab - air-cooled, direct-drive, put gas and oil in it and it once you start it, it'll keep running even with no battery!) </p>
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<p>I also had years and thousands of hours ownership experience with a IO-360 Continental in a 172XP and a IO-540 Lycoming in a C206H Stationair. The fuel injection systems were never problematic and hot-starts were easy once you learn how to do it: Crack the throttle slightly open, pull the mixture to idle/cutoff, crank the engine and then advance the mixture until it starts. Worked each and every time! :>)</p>
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<p>All that being said, I like my carb, I understand my carb, and I can actually work on it - which is rarely needed. </p>
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<p>John</p>
<p>N750A</p>
<p></p> Hi Mark,
The Mike Busch crowd…tag:zenith.aero,2020-10-22:2606393:Comment:7560892020-10-22T01:57:47.997ZClint L Goschhttps://zenith.aero/profile/ClintLGosch
<p>Hi Mark,</p>
<p>The Mike Busch crowd likes injection, seems easier to achieve smooth and consistent lean of peak operation when you can get all your fuel/air mixtures balanced by adjusting the injectors. I have a carb on mine and really like the simplicity, I just lean to roughness during cruise and enjoy the view. The mixture distribution on my engine doesn't seem to allow for aggressive leaning. Flying 70 hours/year, I can't imagine I would save very much on fuel anyway. For my type of…</p>
<p>Hi Mark,</p>
<p>The Mike Busch crowd likes injection, seems easier to achieve smooth and consistent lean of peak operation when you can get all your fuel/air mixtures balanced by adjusting the injectors. I have a carb on mine and really like the simplicity, I just lean to roughness during cruise and enjoy the view. The mixture distribution on my engine doesn't seem to allow for aggressive leaning. Flying 70 hours/year, I can't imagine I would save very much on fuel anyway. For my type of flying, I'd choose a carb again.</p> Induction ice (or other block…tag:zenith.aero,2020-10-22:2606393:Comment:7558312020-10-22T00:25:36.775ZDaniel Niendorffhttps://zenith.aero/profile/DanielNiendorff
<p>Induction ice (or other blockage) is still possible, but the absence of a Venturi pressure drop makes it far less likely. Alternate air source is designed exactly like carb heat, but gets used much less often. <br></br><br></br></p>
<p>I have electronically controlled injectors, and for me hot starts are exactly the same as regular starts. They are a non-issue with my setup. But in the more basic systems I think they are an issue that has to be dealt with. I can’t say to much on that,.....…</p>
<p>Induction ice (or other blockage) is still possible, but the absence of a Venturi pressure drop makes it far less likely. Alternate air source is designed exactly like carb heat, but gets used much less often. <br/><br/></p>
<p>I have electronically controlled injectors, and for me hot starts are exactly the same as regular starts. They are a non-issue with my setup. But in the more basic systems I think they are an issue that has to be dealt with. I can’t say to much on that,..... doesn’t happen to me.</p>
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<p>I hope you find a set that meets your needs.</p>
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<p>Dan</p> Thanks Daniel. Injected engin…tag:zenith.aero,2020-10-22:2606393:Comment:7558292020-10-22T00:17:55.381ZMark Pensenstadlerhttps://zenith.aero/profile/MarkPensenstadler
<p>Thanks Daniel. Injected engines can still get induction icing in the intake filters I hear, so they require an alternate air source. I wonder if that's any more complex than adding carb heat?</p>
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<p>Also I was thinking...when I watch videos from Trent Palmer and others who fly the back country, it seems that a lot of the time they land, stay for 10 minutes, and then they are off to someplace else. I could see me doing that type of exploring and flying (that's why I'm building the…</p>
<p>Thanks Daniel. Injected engines can still get induction icing in the intake filters I hear, so they require an alternate air source. I wonder if that's any more complex than adding carb heat?</p>
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<p>Also I was thinking...when I watch videos from Trent Palmer and others who fly the back country, it seems that a lot of the time they land, stay for 10 minutes, and then they are off to someplace else. I could see me doing that type of exploring and flying (that's why I'm building the SD!) and with multiple (hot) starts, I'm thinking the carb might be the better option?</p>
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<p>I'm interested in hearing what everyone says...</p> I went with fuel injection ma…tag:zenith.aero,2020-10-22:2606393:Comment:7558262020-10-22T00:13:34.369ZDaniel Niendorffhttps://zenith.aero/profile/DanielNiendorff
<p>I went with fuel injection mainly because of the lack of carb icing potential. Lower risk, and you can skip all carb heat procedures. Most, but not all injection systems require return lines. Mine did not, so easy choice for me. The basic system described is one option, but it’s experimental so you can also use the more advanced systems that meter the injectors electronically. Just depends how far you want to take it. </p>
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<p>I went with fuel injection mainly because of the lack of carb icing potential. Lower risk, and you can skip all carb heat procedures. Most, but not all injection systems require return lines. Mine did not, so easy choice for me. The basic system described is one option, but it’s experimental so you can also use the more advanced systems that meter the injectors electronically. Just depends how far you want to take it. </p>
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