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