Sorry Nige, it was my imaginary lower limit to the range of revs that a bad harmonic was present, Not the lower limit of operational revs. though i guess why does the lower rev range of a bad harmonic matter if you are to avoid prolonged operation below 2300. This being the case what is the official standpoint of limbach on thermalling with the engine ticking over below this 2300 limit? Cheers Ric
From: dog@lists.riverland.net.au [mailto:dog@lists.riverland.net.au] On Behalf Of Nigel Baker Sent: Monday, 22 October 2018 2:54 PM To: dog@lists.riverland.net.au Subject: RE: [DOG mailing list] Zenith 150 CD 3 - oil You have seen it Rick and not at the pub over a beer.. Look in brackets below. 2300RPM Nige. 9 Hoffmann 2 H 36 DIMONA Limitations 2.4 Engine Limitations Engine Type: Limbach L 2000 EB 1C RPM Limitations (Indicator Markings) Maximum take off RPM (maximum 5 minutes) 59 KW (So hp.) 3,400 RPM Maximum ambient atmospheric temperature + 380 C (+100 F) Maximum RPM (METO) 53 KW (72 hp.) 3,000 RPM Red Line 3,400 RPM Caution Range - Yellow Arc 3,000 – 3,400 RPM Operating RPM - Green Arc 700 – 3,000 RPM CAUTION Avoid RPM during cruise below 2300 min –1! 2.5 Oil Pressure: Maximum Oil Pressure (red line) 4 bar (55.8 psi) Minimum Oil Pressure (red line) 1 bar (13.9 psi) Operating Range (green arc) 1 - 4 bar (13.9 — 55.8 psi) 2.6 Oil Temperature: Maximum Oil Temperature (red line) 120 C (248 F) Operating Range (green arc) 50 - 120 C (122 — 248 F) Minimum Temperature (red line) 50 C (122 F) 2.7 Cylinder Head Temperature: Maximum Cylinder head temperature (red line) 250 C. (482 F) 2.8 Voltmeter: Maximum voltage with engine running: (red line) 14 VDC 2—3 From: dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au> <dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au>> On Behalf Of Ric Sutton Sent: Monday, October 22, 2018 4:39 PM To: dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au> Subject: RE: [DOG mailing list] Zenith 150 CD 3 - oil Hi Jarek I’m sorry but i have had a look and can’t seem to find a reference to my second imaginary number. I don’t know whether it was obtained through conversations with Hoffman people or limbach people or dimona people or people from a random encounter at a pub. It may have been obtained from what felt about right ie. the bottle of beer in my cup holder didn’t froth over or go prematurely flat below those revs( just kidding, though if anybody here has a clever idea on where and how to mount a cup holder that would be great). All jokes aside i do recall a conversation with a propeller service agent that told me of an aluminium based air frame that was financially written off after cracks were found due to the bad harmonics of an “alternate” propeller so from that i took it as being a serious thing. i also found some you tube videos of propeller blades self destructing.( propeller resonance<https://www.google.com/url?sa=t&rct=j&q=&esrc=s&source=video&cd=1&cad=rja&uact=8&ved=0ahUKEwiLtIzSsJneAhVLMI8KHY8YAUEQtwIIJzAA&url=https%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3DPQjmDmcWJn8&usg=AOvVaw048W5y_0kGNdO0WaB0eUdi>) What you have done now though is inspired me to finish my home made accelerometer/balancer and gather some actual real data to see if i can establish some numbers for my own curiosity ☺ Welcome aboard and may you enjoy your dimona as much as many of us do Cheers Ric From: dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au> [mailto:dog@lists.riverland.net.au] On Behalf Of Jarek Steliga Sent: Friday, 19 October 2018 3:31 AM To: dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au> Subject: Re: [DOG mailing list] Zenith 150 CD 3 - oil Michael, Ric thank you. Ric, where did you find the "range" of unrecommended RPMs as opposed to just a lower limit of 2300? I leafed through both attached documents and didn't come accross the second number. I also tried to google "Limbach L 2000 harmonics" and got nothing. If it isn't harmonics (wchich I hope it isn't) then the RPMs lower limit would suggest excessive load torque with prop in just the cruise position. Regards Jarek Regards Jarek czw., 18 paź 2018 o 15:53 Michael Stockhill <sto...@gmail.com<mailto:sto...@gmail.com>> napisał(a): In the States, dashpot oil is readily available from vintage British car parts suppliers such as Moss Motors for $10-12 for a squeeze bottle. Claimed to have appropriate preservatives and conditioners. As little as is consumed, I have found no incentive to look for alternatives. On Thu, Oct 18, 2018, 5:09 AM Ric Sutton <ricinthel...@outlook.com<mailto:ricinthel...@outlook.com>> wrote: Hi Jarek Here’s my two cents worth- i use automatic transmission/power steering fluid in my cd150’s. seems to work fine and haven’t had any compatibility issues with rubber diaphragms etc as yet. The oil and plunger act as a damper for the piston to which the needle that alters your fuel air mixture is attached. Over the years i have heard various stories from people that use these carbies n race cars that actually snip the damper off(similarly people that don’t put any oil in there), to stories from people that use them in multi carb set ups (ie 12 cylinder jaguar engines) that can’t get them to tune properly without the correct oil (though after some discussion i believe that spindle wear was more their issue). In an automotive situation there will be some minor noticeable throttle response differences but in the dimona application i suspect the differences will be minimal particularly as instantaneous dramatic throttle changes should be rare. The rev issue The reason the book states that prolonged operation in that rev range is to be avoided during cruise is indeed because of a bad harmonic (potential for cracked crankshafts etc) Thus, i believe that it is a problem whether the blades are in fine or course pitch it is just operating in that rev range with a moderate load on. In saying that, these are a reasonably robust little engine, don’t be scared. Note the emphasis on the word prolonged. Please someone jump in if they have info to the contrary this is just what i have learnt over the years and am always willing to learn something new. From: dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au> [mailto:dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au>] On Behalf Of Jarek Steliga Sent: Thursday, 18 October 2018 5:47 PM To: dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au> Subject: Re: [DOG mailing list] Zenith 150 CD 3 - oil Hello again, If my oil "mixture" is too thick (or too thin) what are the symptoms? Does the carburator respond with a delay or too fast to the throttle inputs? Is that dangerous or just annoying and easily noticed? Regards Jarek czw., 18 paź 2018 o 08:43 Jarek Steliga <jarekstel...@gmail.com<mailto:jarekstel...@gmail.com>> napisał(a): Thank you śr., 17 paź 2018 o 23:28 Rob Thompson <amessageto...@gmail.com<mailto:amessageto...@gmail.com>> napisał(a): Part number 10 on the diagram. regards Rob Rob Thompson 0429 493 828 (Please note that my new email address is amessageto...@gmail.com<mailto:amessageto...@gmail.com>) On Thu, Oct 18, 2018 at 7:50 AM Jarek Steliga <jarekstel...@gmail.com<mailto:jarekstel...@gmail.com>> wrote: Hello Rob, The oil seems to disappear too fast as you say. Could you help me to identify which particular o-ring on the attached drawing needs to be replaced? When you mention 5/xx multigrade, do you mean 5W/xx? Best regards Jarek ---------- Forwarded message --------- From: Rob Thompson <amessageto...@gmail.com<mailto:amessageto...@gmail.com>> Date: wt., 16 paź 2018 o 22:23 Subject: Re: [DOG mailing list] Zenith 150 CD 3 - oil To: <dog@lists.riverland.net.au<mailto:dog@lists.riverland.net.au>> Hi again Jarek, You can use straight engine oil but even a 5/xx multigrade is a bit thick and tends to dampen the piston too much. We mix 50/50 light machine oil and engine oil. If it keeps disappearing it means that the rubber O-ring which seals the needle inside the piston is perished. regards Rob Rob Thompson 0429 493 828 (Please note that my new email address is amessageto...@gmail.com<mailto:amessageto...@gmail.com>) Hello, As per Limbach Maintenance Instruction, only a specific oil p / n: 170.210.005 can be used to fill up the carburator. Since this seems to me pretty pricey, can other, readily available oils be used in its place? What is its recommended viscosity? Best regards Jarek --------------------------------------------------------------------- You are subscribed to the Dimona Owners Group mailing list. To unsubscribe, send email to: dog-unsubscr...@lists.riverland.net.au<mailto:dog-unsubscr...@lists.riverland.net.au>
