Engines ??????? - Zenith Aircraft Builders and Flyers2024-03-29T09:15:44Zhttps://zenith.aero/forum/topics/engines-1?commentId=2606393%3AComment%3A651922&feed=yes&xn_auth=noUpdate 2: We didn't change th…tag:zenith.aero,2018-11-01:2606393:Comment:6519222018-11-01T13:41:41.639ZTim Croyhttps://zenith.aero/profile/TimothyCroy
<p>Update 2: We didn't change the main jet during the condition inspection. It's been flying great with no vibration up to ~2950 RPM before I get a little stutter in the engine at wide open throttle. I made a thicker, modified oil cooler hose bracket (old one was cracked a little) that keeps the line from hitting the cowling. That may have helped also. I will update after main jet is replaced. Thanks.</p>
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<p>Update 2: We didn't change the main jet during the condition inspection. It's been flying great with no vibration up to ~2950 RPM before I get a little stutter in the engine at wide open throttle. I made a thicker, modified oil cooler hose bracket (old one was cracked a little) that keeps the line from hitting the cowling. That may have helped also. I will update after main jet is replaced. Thanks.</p>
<p></p> As I have been reading this o…tag:zenith.aero,2018-05-09:2606393:Comment:6269182018-05-09T23:09:31.143ZGil DeVaulthttps://zenith.aero/profile/GilDeVault
<p>As I have been reading this on the best engines I can only offer my opinion as I don't know any thing really about any of them. As a cautious person however, I strongly lean to engines purposely designed for flight. Many of these engines have stood the test of time, some from the thirties and forties. They run at lower rpms, and have 2000 hour TBOs and no gear drives. Simple engines that are the utmost in reliability. At one time the auto conversion was a cost saving option, I'm not so sure…</p>
<p>As I have been reading this on the best engines I can only offer my opinion as I don't know any thing really about any of them. As a cautious person however, I strongly lean to engines purposely designed for flight. Many of these engines have stood the test of time, some from the thirties and forties. They run at lower rpms, and have 2000 hour TBOs and no gear drives. Simple engines that are the utmost in reliability. At one time the auto conversion was a cost saving option, I'm not so sure that is the case anymore.</p> Just wanted to provide a quic…tag:zenith.aero,2018-05-03:2606393:Comment:6261892018-05-03T20:18:18.230ZTim Croyhttps://zenith.aero/profile/TimothyCroy
<p>Just wanted to provide a quick update. I have some time now to dedicate to the plane again. Last time I flew about a month ago I discovered at cruise if I increased RPMs over 2950 or so it would vibrate and the EGTs dropped 70-100F so I ordered the 250 and 245 main jets. My condition inspection is due now so we'll probably change the main jet after we see what size it's currently using - it's been changed at least twice so far according to my engine log book. Hopefully, this will help. I…</p>
<p>Just wanted to provide a quick update. I have some time now to dedicate to the plane again. Last time I flew about a month ago I discovered at cruise if I increased RPMs over 2950 or so it would vibrate and the EGTs dropped 70-100F so I ordered the 250 and 245 main jets. My condition inspection is due now so we'll probably change the main jet after we see what size it's currently using - it's been changed at least twice so far according to my engine log book. Hopefully, this will help. I received this tip from Nick at Arion Aircraft in Shelbyville, TN (taking over much of the work Pete Krotje at Jabiru NA used to do, both great, knowledgeable guys), and now I understand better what Darryl was saying.</p>
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<p>Thanks again. I'll let you know how it all turns out.</p>
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<p>Blue skies, Tim</p>
<p></p> thank youtag:zenith.aero,2017-07-20:2606393:Comment:5789842017-07-20T16:49:33.675ZTim Croyhttps://zenith.aero/profile/TimothyCroy
<p>thank you</p>
<p>thank you</p> Hi Tim, have attached a carby…tag:zenith.aero,2017-07-20:2606393:Comment:5788842017-07-20T16:32:10.127ZDarryl Legghttps://zenith.aero/profile/DarrylLegg
<p>Hi Tim, have attached a carby tuning guide, have a good read and then see if that might be your problem. Running rough at that RPM could just be your vibration.</p>
<p>Hi Tim, have attached a carby tuning guide, have a good read and then see if that might be your problem. Running rough at that RPM could just be your vibration.</p> Sorry about that Wayne, it's…tag:zenith.aero,2017-07-20:2606393:Comment:5788622017-07-20T01:05:39.413ZTim Croyhttps://zenith.aero/profile/TimothyCroy
<p>Sorry about that Wayne, it's 'wide open throttle.' Can't shake the acronym thing as a retired military guy.</p>
<p>Sorry about that Wayne, it's 'wide open throttle.' Can't shake the acronym thing as a retired military guy.</p> Hi Darryl,
Yes I do. It's fu…tag:zenith.aero,2017-07-19:2606393:Comment:5791632017-07-19T22:25:11.416ZTim Croyhttps://zenith.aero/profile/TimothyCroy
<p>Hi Darryl,</p>
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<p>Yes I do. It's funny you mention that since during each of the five take-offs I did that evening I would always get an EGT temperature span too great warning from the GRT EIS on my EFIS display. I'm not sure what that might mean at this point.</p>
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<p>Tim</p>
<p>Hi Darryl,</p>
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<p>Yes I do. It's funny you mention that since during each of the five take-offs I did that evening I would always get an EGT temperature span too great warning from the GRT EIS on my EFIS display. I'm not sure what that might mean at this point.</p>
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<p>Tim</p> You know what's WOT, but I do…tag:zenith.aero,2017-07-19:2606393:Comment:5791622017-07-19T20:27:22.655ZWayne Tysonhttps://zenith.aero/profile/WayneTyson482
<p>You know what's WOT, but I don't.</p>
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<p>Wayne</p>
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<p>You know what's WOT, but I don't.</p>
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<p>Wayne</p>
<p></p> Hi Tim,
Sounds to me like you…tag:zenith.aero,2017-07-19:2606393:Comment:5788522017-07-19T17:10:40.388ZDarryl Legghttps://zenith.aero/profile/DarrylLegg
<p>Hi Tim,</p>
<p>Sounds to me like your engine is a bit out of tune, maybe a bit rich. You might have a blocked air filter or might need to drop down 1 size on the main jet. Backing off the throttle a bit then it smooths out is a good indicator. Do you have EGT monitoring?</p>
<p>Hi Tim,</p>
<p>Sounds to me like your engine is a bit out of tune, maybe a bit rich. You might have a blocked air filter or might need to drop down 1 size on the main jet. Backing off the throttle a bit then it smooths out is a good indicator. Do you have EGT monitoring?</p> The knocking sound might have…tag:zenith.aero,2017-07-19:2606393:Comment:5785242017-07-19T03:53:45.461ZJohn Austinhttps://zenith.aero/profile/JohnLAustin
<p>The knocking sound might have been the metallic pin on each blade that nests in the plastic adjuster in the center of the hub - you probably heard a pin hitting the plastic.Make sure the pin is firmly attached to the blade and not loose! If it is loose, it needs to go back to Sensenich for repair.</p>
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<p>Sounds like your torquing sequence is right-on! Torque up all the bolts in two or three stages with the last sequence arriving at the final torque. Yes, Nord-lock washers can make…</p>
<p>The knocking sound might have been the metallic pin on each blade that nests in the plastic adjuster in the center of the hub - you probably heard a pin hitting the plastic.Make sure the pin is firmly attached to the blade and not loose! If it is loose, it needs to go back to Sensenich for repair.</p>
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<p>Sounds like your torquing sequence is right-on! Torque up all the bolts in two or three stages with the last sequence arriving at the final torque. Yes, Nord-lock washers can make some unnerving cracking or popping sounds, but that's normal and they work great!</p>
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<p>John</p>