Non Genuine means means a part which does not come from Limbach with a *release form*. Yes many limbach parts are just off the shelf parts re branded "Limbach". Some parts are made in special production runs by companies like Mahle and Bosche. In Australia, to drill extra spark plug holes we would require an engineering approval. regards Rob
Rob Thompson 0429 493 828 On Mon, Jan 11, 2021 at 5:37 AM Jarek Steliga <[email protected]> wrote: > > > Rob, > > What does 'non genuine heads' mean to you? > From the very beginning, Limbach has been using only VW and Porsche serial > products. > > The Limbach cylinder head is part of the series production of plants that > continue the production of spare parts. > > Limbach has never produced cylinder heads in-house !! > I think there are mechanics who have already repaired such an engine and > know all the technical data of the Limbach L2000 engine. > > Ps. If I take off my certified cylinder head and drill holes for the > second magneto set, then what would you say to that, Rob? > > Do you also think that the Limbach plant produces its own valves? Or maybe > nuts and bolts ???, they are also certified for these parts? > > Regards > Jarek > > > > > > ---------- Forwarded message --------- > From: Jarek Steliga <[email protected]> > Date: Sat, 9 Jan 2021 at 08:34 > Subject: Re: [DOG mailing list] Backup electronic ignition on Limbach 2000 > / Dimona > To: Laurie Hoffman via dog <[email protected]> > > > Thank you > > On Thu, 7 Jan 2021 at 23:58, Rob Thompson <[email protected]> wrote: > >> Limbach previously used TRW valves which are very common in VW rebuilds >> but I think (but not sure) genuine VW uses Mahle. >> >> Limbach changed to a new type a few years ago which are not branded. The >> stems are magnetic and the heads hardly magnetic at all. So the valve heads >> must be a mostly stainless alloy. >> >> Problem with all stainless valves is that the stems have a habit of work >> hardening and breaking. Particularly when used in combination with hard >> seats. Many valve seats are stellite hard faced to cope with unleaded fuels. >> >> Sodium valves would be interesting to try but it still comes back to the >> certified / non-certified engine issue. >> >> regards >> Rob >> >> Rob Thompson >> 0429 493 828 >> >> >> >> On Fri, Jan 8, 2021 at 9:35 AM Michael Stockhill <[email protected]> >> wrote: >> >>> Does anyone have an opinion on stainless steel valves or other >>> aftermarket stuff. Sodium cooled valves would certainly appeal to me. I had >>> a 1972 VW camper with a later generation air cooled engine. It swallowed a >>> valve at 40,000 miles. VW had a recall that changed out the solid valves >>> for sodium...seemed to be a good fix at the time. >>> >>> Can we verify that the current Limbach valves are stock VW? >>> >>> Michael Stockhill >>> >>> On Thu, Jan 7, 2021, 1:44 PM Rob Thompson <[email protected]> >>> wrote: >>> >>>> Hi Jarek, >>>> *Before you change to non genuine heads please make sure you are fully >>>> aware of the legal and insurance implications!* >>>> >>>> - You need to remove the old heads and measure the combustion chamber >>>> volume. >>>> See https://www.youtube.com/watch?v=yqAr4DUqEt4 >>>> >>>> - Measure the OD of the cylinder top flange. Sorry I can't remember the >>>> figure. >>>> >>>> - Give those measurements to whoever is machining the heads. >>>> >>>> - Limbach heads have standard VW size valves and guides. They >>>> previously used TRW valves but the current ones do not have any identifying >>>> marks. >>>> >>>> - I do not have any idea which are good brands. You would think that >>>> Great Plains should be of reasonable quality. Check out the homebulders' >>>> forums like this one >>>> http://eaaforums.org/showthread.php?9071-VW-Aircraft-engines-Tell-me-about-your-experiences >>>> >>>> regards >>>> Rob >>>> >>>> Rob Thompson >>>> 0429 493 828 >>>> >>>> >>>> >>>> On Fri, Jan 8, 2021 at 7:44 AM Jarek Steliga <[email protected]> >>>> wrote: >>>> >>>>> >>>>> Hello again, >>>>> >>>>> I'm just wondering if Great Plains will be able to make exactly the >>>>> same copies of the Limbach's head on the four points of the spark plug. >>>>> I have already contacted the Limbach company and in response I >>>>> received these words: "We do not provide any technical data and parameters >>>>> regarding the construction of Limbach L2000 heads" >>>>> In this case, making a copy of the heads is problematic. >>>>> Does anyone know the technical data of the Limbach head. >>>>> 1. Head bore for 90mm MAHLE 90ZN4 cylinder. >>>>> 2.Combustion chamber size. >>>>> 3. inlet valves diameter. >>>>> 4. diameter of exhaust valves. >>>>> 5. type of valves, what is the diameter of the stem. >>>>> 6.Type of valve guides. >>>>> 7. What manufacturer of heads to use to copy the Limbach head. There >>>>> are Brazilian, Mexican and even Chinese heads ..., the latter apparently >>>>> turn out to be very solid in the opinions of car mechanics, but I guess >>>>> what matters to us is the opinion of aviation mechanics. >>>>> >>>>> Regards >>>>> Jarek >>>>> >>>>> >>>>> >>>>> >>>>> . >>>>> >>>>> ---------- Forwarded message --------- >>>>> From: Jarek Steliga <[email protected]> >>>>> Date: Tue, 5 Jan 2021 at 20:47 >>>>> Subject: Re: [DOG mailing list] Backup electronic ignition on Limbach >>>>> 2000 / Dimona >>>>> To: Laurie Hoffman via dog <[email protected]> >>>>> >>>>> >>>>> Rob, Ian, >>>>> >>>>> Thank you. I live in Poland and have my Dimona registered here. We >>>>> have been governed by EASA for quite some time. >>>>> >>>>> Regards >>>>> Jarek >>>>> >>>>> >>>>> >>>>> On Tue, 5 Jan 2021 at 09:05, Ian Mc Phee <[email protected]> wrote: >>>>> >>>>>> The great planes heads may need machining to match the Limbach. Also >>>>>> there is, a, Limbach SB re matching heads to cylinders. About 20 years, >>>>>> ago Limbach introduced marks on cylinders, and heads and you need to look >>>>>> at char to check what goes, with what. >>>>>> >>>>>> Personally I would give sr no of engine to Limbach and they will make >>>>>> up a dual port head and more recently they have improved the underside of >>>>>> thrir heads and a little more metal. Yes will cost more. The coils are >>>>>> as >>>>>> used on Honda, Gull Wing motorbike from guess 80s. >>>>>> >>>>>> I do know of a, L2400 engine that got Sauer to make special heads for >>>>>> the Limbach as Sauer had much more finning on heads, than Lim ach were >>>>>> using. The engine ran for 10 to 12years, perfectly but then they were >>>>>> "discovered" and owner was grounded for think 18 months. . The owner >>>>>> got >>>>>> Mike Byrne's to to the EO to fit the heads and is all legal. >>>>>> >>>>>> Ian McPhee >>>>>> +61 428847642 >>>>>> Box 657 Byron Bay NSW 2481 Australia >>>>>> >>>>>> On Tue, 5 Jan. 2021, 10:06 Rob Thompson, <[email protected]> >>>>>> wrote: >>>>>> >>>>>>> If you buy the Great Plains cylinder heads, they will machine them >>>>>>> to the right cylinder size but you will have to adjust the size of the >>>>>>> combustion chamber to get the correct compression ratio. >>>>>>> *Please Note: I have not used these Great Plains heads and in most >>>>>>> countries you will have to get "Experimental" registration approval to >>>>>>> legally use them. * >>>>>>> regards >>>>>>> Rob >>>>>>> >>>>>>> Rob Thompson >>>>>>> 0429 493 828 >>>>>>> >>>>>>> >>>>>>> >>>>>>> On Tue, Jan 5, 2021 at 7:11 AM Jarek Steliga <[email protected]> >>>>>>> wrote: >>>>>>> >>>>>>>> Rob, >>>>>>>> >>>>>>>> Thank you. >>>>>>>> >>>>>>>> Regards >>>>>>>> Jarek >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> On Sun, 3 Jan 2021 at 22:46, Rob Thompson <[email protected]> >>>>>>>> wrote: >>>>>>>> >>>>>>>>> Hi Jarek, >>>>>>>>> The rules and regulations are supposed to stop people doing stupid >>>>>>>>> things but they also stop people doing sensible things. >>>>>>>>> >>>>>>>>> Great Plains Aircraft sell dual ignition heads.... >>>>>>>>> http://www.greatplainsas.com/sccylheads.html >>>>>>>>> >>>>>>>>> If you buy these you can always put your Limbach heads back on if >>>>>>>>> you want to turn it back into a "certified" motor. >>>>>>>>> >>>>>>>>> >>>>>>>>> regards >>>>>>>>> Rob >>>>>>>>> >>>>>>>>> Rob Thompson >>>>>>>>> 0429 493 828 >>>>>>>>> >>>>>>>>> >>>>>>>>> On Mon, Jan 4, 2021 at 7:18 AM Jarek Steliga < >>>>>>>>> [email protected]> wrote: >>>>>>>>> >>>>>>>>>> Rob, >>>>>>>>>> >>>>>>>>>> Question is, is it better to have a certified Limbach engine >>>>>>>>>> (which has not been modernized for 50 years), or to introduce a >>>>>>>>>> second >>>>>>>>>> ignition system and be 99% sure that in a critical situation it will >>>>>>>>>> save >>>>>>>>>> your life. >>>>>>>>>> It is strange that such an engine was certified at the time. >>>>>>>>>> There is no problem with drilling, as you can see. There are >>>>>>>>>> already plants that do it on request, but only in the US. >>>>>>>>>> It is strange that Peter Limbach himself or his successors have >>>>>>>>>> not introduced this system to their product so far. >>>>>>>>>> >>>>>>>>>> Generally, SLICK has a mandatory service of 250h / 2 years, but >>>>>>>>>> mine was about 40h / 2 years old and the rotor had to be replaced, >>>>>>>>>> the >>>>>>>>>> engine had already been working badly, so having a secondary ignition >>>>>>>>>> system you can feel more confident by 99%. >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Regards >>>>>>>>>> Jarek >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> >>>>>>>>>> On Sun, 3 Jan 2021 at 18:11, Jarek Steliga < >>>>>>>>>> [email protected]> wrote: >>>>>>>>>> >>>>>>>>>>> Thank you. Looks like none of these has ever been tried by >>>>>>>>>>> members of this mailing list. >>>>>>>>>>> >>>>>>>>>>> Regards >>>>>>>>>>> Jarek >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> On Sun, 3 Jan 2021 at 04:19, Michael Stockhill <[email protected]> >>>>>>>>>>> wrote: >>>>>>>>>>> >>>>>>>>>>>> Thanks, Rob, >>>>>>>>>>>> >>>>>>>>>>>> I knew that once. Sod old age. >>>>>>>>>>>> >>>>>>>>>>>> M >>>>>>>>>>>> >>>>>>>>>>>> On Sat, Jan 2, 2021, 5:27 PM Rob Thompson < >>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>> >>>>>>>>>>>>> Limbach requires a 250 hour magneto inspection on >>>>>>>>>>>>> single ignition motors. >>>>>>>>>>>>> >>>>>>>>>>>>> https://limflug.de/en/support/downloads.php?type=technicalBulletins&id=905.700.020.305.pdf&action=download >>>>>>>>>>>>> >>>>>>>>>>>>> regards >>>>>>>>>>>>> Rob >>>>>>>>>>>>> >>>>>>>>>>>>> Rob Thompson >>>>>>>>>>>>> 0429 493 828 >>>>>>>>>>>>> (Please note that my new email address is >>>>>>>>>>>>> [email protected]) >>>>>>>>>>>>> >>>>>>>>>>>>> >>>>>>>>>>>>> On Sun, Jan 3, 2021 at 12:05 PM Michael Stockhill < >>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>> >>>>>>>>>>>>>> While most mags have a 500 hour inspection interval, with the >>>>>>>>>>>>>> Limbach mag being direct drive, and firing with wasted spark, I >>>>>>>>>>>>>> believe it >>>>>>>>>>>>>> has some interesting environmental issues. It turns much faster >>>>>>>>>>>>>> than other >>>>>>>>>>>>>> applications and fires more frequently. After seeing my last mag >>>>>>>>>>>>>> at 250 >>>>>>>>>>>>>> hours, internally it looked more like a 500 hour mag to me. >>>>>>>>>>>>>> Hence, I have >>>>>>>>>>>>>> decided on that inspection/overhaul interval. Having only one is >>>>>>>>>>>>>> a good >>>>>>>>>>>>>> incentive. >>>>>>>>>>>>>> >>>>>>>>>>>>>> Does anyone else have any observations or thoughts on this? >>>>>>>>>>>>>> >>>>>>>>>>>>>> Michael Stockhill >>>>>>>>>>>>>> Polson, MT >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> >>>>>>>>>>>>>> On Sat, Jan 2, 2021, 4:31 PM Rob Thompson < >>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>> >>>>>>>>>>>>>>> There are a number of secondary ignition systems designed >>>>>>>>>>>>>>> for Aero VW motors. See >>>>>>>>>>>>>>> http://www.greatplainsas.com/scsecign.html >>>>>>>>>>>>>>> The electronics are easy and cheap. >>>>>>>>>>>>>>> The difficult bit is that you have to drill the bottom spark >>>>>>>>>>>>>>> plug holes precisely so that you can get a wrench between the >>>>>>>>>>>>>>> pushrod >>>>>>>>>>>>>>> tubes. If you go ahead, get your engineering company to >>>>>>>>>>>>>>> practice on an old >>>>>>>>>>>>>>> set of heads. >>>>>>>>>>>>>>> This modification will turn your Limbach L2000 into an >>>>>>>>>>>>>>> uncertified motor unless you can get a suitable engineering >>>>>>>>>>>>>>> approval. >>>>>>>>>>>>>>> regards >>>>>>>>>>>>>>> Rob >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> Rob Thompson >>>>>>>>>>>>>>> 0429 493 828 >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> >>>>>>>>>>>>>>> On Sat, Jan 2, 2021 at 11:36 PM Jarek Steliga < >>>>>>>>>>>>>>> [email protected]> wrote: >>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Hello and all the best in 2021! >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Dimona with the Limbach L2000 engine does not have a second >>>>>>>>>>>>>>>> ignition system, because the manufacturer of these engines for >>>>>>>>>>>>>>>> unknown >>>>>>>>>>>>>>>> reasons did not introduce such a safety system into production. >>>>>>>>>>>>>>>> Do you believe a modification now is possible? Or maybe >>>>>>>>>>>>>>>> some of you have already made such a modification with a >>>>>>>>>>>>>>>> Limbach L2000 >>>>>>>>>>>>>>>> engine equipped with one SLICK 4330 type magneto in your bird. >>>>>>>>>>>>>>>> In the US it is a popular solution and even all companies >>>>>>>>>>>>>>>> offer ready-made kits for such modification, which is >>>>>>>>>>>>>>>> definitely additional >>>>>>>>>>>>>>>> safety during the flight. >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> https://www.kitplanes.com/electronic-ignitions-2/ >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> Best regards >>>>>>>>>>>>>>>> Jarek >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>> >>>>>>>>>>>>>>>>
