We have been using 98 only (except when on tour) now for the past 18 months and there have been no issues. Before that I was doing a blend of 25% Avgas and 75% 98 and up till then that would be my choice as it provides enough tetral ethyl lead lead for lubrication.
When leaving an engine for a while I drain tank and run a few litres of avgas with 100;1 two stroke oil just to leave a smear of oil. The positive of 98 is less lead on plugs although I always use 2 washers under each plug on L2000. For the past 250hrs with the L2000 I have not had to adjust the tappets ONCE and to me that is amaizing result. I think it is due to Tech Bul 53 line 4 which states the CHT should never exceed 180degC on full power. It took me a while but I got it down from about 193degC down to 168 to 172degC ON FULL POWER. I now believe if you need to adjust tappets then richen up the engine. Fuel is cheap. I use KSA CHT1DT (digital dual CHT with overtemp light and flashing light for rapid cooling ie exceeding 22degC/min rate) This is used in about 1/2 the Pawnees/tugs in Australia for the past 30+years and the only cracked heads in Lycoming are clubs that do not have good CHT. While on engines I had a LAME friend recently use a dynamic balance on the L2000 - I could only recommend it!!! I am always worried about that crack appearing in the back of engine (usually lower right hand side from base of stud to a welsh plug) I cast plaster in the shave of engine and then had it made into aluminium plug with say 2mm space around. I then "glued " it in with Proseal 120 (10 to 1 fuel or oil tank sealant with 2hr cure time). It takes the temperature no worries as my plug has been in place for 400hrs I have tried Devcon but cracks out and also JB weld a higher temp epoxy but still no good. Proseal does work and stays there and if somebody had a oil leak I would at least try the Proseal On fuel tank I think Dafydd Llwellyd did the paperwork for metal tank for Geoff Edwards the guy that imported the Thai h36s. My experience do everything you can before you visit the aircraft welder. I even "glued" an item together with JB weld. Another thing is build a plaster of paris mould and let him weld in this mould. I made moulds of all engine exhaust pipes and he welded together in my mould and it all worked Thats all for now - I love Limbachs Ian McPhee. . On 12 September 2011 16:22, Nigel Baker <[email protected]> wrote: > BP Ultimate is 98 and that is all I run except when away from home and > I can’t get it so use 100LL. > I prefer the 98 unleaded and have seen heads coked up with that horrible > yellow stuff many times from 100LL and especially on Hi Lead. > Limbach advise me it is better to run unleaded but being an aircraft > engine must also be able to be run on Avgas. > Nige. > > > *From:* Rob Thompson <[email protected]> > *Sent:* Monday, September 12, 2011 8:14 AM > *To:* [email protected] > *Subject:* Re: [DOG mailing list] mogas avgas blends > > Thanks Ian, > Which fuel distributor has 98 octane? I think BP is 97. > How do you find out if it is capital city fuel. > Rob > > PO Box 129, > Lawson, NSW, 2783. > phone 02 47592307 > mobile 0429 493828 > > > > > > > > > > > > > > > > > > > > ............................................. > > --- On *Mon, 12/9/11, Ian Mc Phee <[email protected]>* wrote: > > > From: Ian Mc Phee <[email protected]> > Subject: Re: [DOG mailing list] mogas avgas blends > To: [email protected], "Erich Witstock(gmail)" < > [email protected]> > Received: Monday, 12 September, 2011, 8:19 AM > > We always used Avgas but then 15month ago they stopped letting little > fuel trucks on deliveries of gold coast airport so ever since we are back > to 98 and we have had no problems The L2000 says min 96. if i had my > choice i would run 20% Av gas and 80% 98 as that is all the tetra ethyl > lead you need for lub - rest is not needed > > SOME only 98 especially capital city stuff can be down on octane rating > and if you go up to 5000ft and down again with that fuel it will drop > octane That fuel should never fly and sometimes gets to country > > Ian m > > > > On 11 September 2011 17:21, Rob Thompson < > wlmailhtml:/mc/[email protected]> wrote: > > I am wondering about other experiences with fuel for the limbach > motors.o We have been running almost exclusively on 100LL avgas and > occasionally on a 50/50 blend with 97 mogas when avgas is difficult. > Has anyone been running mostly on high mogas blends and if so how well do > components like exhaust valves last? > Rob (VH-GYT) > > PO Box 129, > Lawson, NSW, 2783. > mobile 0429 493828 > > > > > > > > > > > > > > > > > > > > ............................................. > > --- On *Thu, 8/9/11, Rob Thompson < > wlmailhtml:/mc/[email protected]>* wrote: > > > From: Rob Thompson <wlmailhtml:/mc/[email protected]> > > Subject: Re: [DOG mailing list] Fuel Tank > To: wlmailhtml:/mc/[email protected] > > Received: Thursday, 8 September, 2011, 7:00 PM > > I was thinking about making a cardboard "mock up" tank from the plans > then checking the fit. When all is OK then use the cardboard panels as > templates to guillotine the aluminium sheet. > Our fibreglass tank is a very tight fit in the back compartment. I am a > little concerned that if the aluminium tank is also a tight fit that a very > slight error in measurements and/or construction could be a major problem. > > Rob (GYT) > > > > PO Box 129, > Lawson, NSW, 2783. > phone 02 47592307 > mobile 0429 493828 > > > > > > > > > > > > > > > > > > > > ............................................. > > --- On *Wed, 7/9/11, Nigel Baker < > wlmailhtml:/mc/[email protected]>* wrote: > > > From: Nigel Baker <wlmailhtml:/mc/[email protected]> > > Subject: [DOG mailing list] Fuel Tank > To: "DOGS" <wlmailhtml:/mc/[email protected]> > > Received: Wednesday, 7 September, 2011, 11:20 PM > > Hi All. > This post is for those in Australia with H36 Aircraft. > For those who have the FRP fuel tank which needs inspection every annual > or 100hours note it expires at 3000 hours. > I have a copy of the drawings for the alloy replacement fuel tank. > This will require and OZ E.O. being raised for the production of the same > and welded by a CASA certified welder. > I have spent some time tracing over the drawings as they are old blue > prints and working through the interpretation with German speaking > engineers to get then to the point of being able to be used here. > There are some tooling issues which will need to be addressed in an EO for > an alternative to the fabrication method on the drawings. > Thus before Rob and I go down this this path to produce 2 tanks is there > anyone else on the list interested in cost sharing for an upgrade. > I will happily do the change just to avoid the AD each year. > > Also I have had a quote from Diamond. To put things in perspective the > quote is less than a new set of clear view panels and rails for the canopy. > If there are enough interested I can negotiate a better price. Being > realistic with the way the exchange rate is the price isn’t bad and if we > can get a discount for volume it will be even better. > > From Diamond. > “P/N for the tank is DV2-2811-00-00, sales price € 635,18 for one piece > We do not have them on stock. If you are going to order them the external > supplier has to produce them new for you.” > > Cheers. > Nige. > > > > >
