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 >>>>>>>>>>>> >>>>>>>>>>>> >>>>>>>>>>>>
