bhups matharu Posted May 4, 2020 Share Posted May 4, 2020 Hi Guys... got a new dle55ra in A Yak 54, just wandering how you break in new engines,I.e on the ground on the plane or on a test bench or in the air? Regards Matt Quote Link to comment Share on other sites More sharing options...
flight1 Posted May 4, 2020 Share Posted May 4, 2020 give it a first short run with oil content as instructions on the ground in plane to make sure it works then then go fly making sure you baffling is good and it dosent overheat, just don't ring it out keeping max throttle to short bursts, when its run a bit 1 to 2L then tweak with the hi/low settings. if you run it in on a bench you will have to run it in again in plane as operating temps and prop sizes are different Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted May 4, 2020 Share Posted May 4, 2020 Gas? Do you mean petrol? One is a liquid and the other is ... erm an Americanism. Quote Link to comment Share on other sites More sharing options...
bhups matharu Posted May 4, 2020 Author Share Posted May 4, 2020 Gary.. yes petrol )... been on too many American forums 🤣🤣 Quote Link to comment Share on other sites More sharing options...
flight1 Posted May 4, 2020 Share Posted May 4, 2020 Posted by Gary Manuel on 04/05/2020 21:45:22: Gas? Do you mean petrol? One is a liquid and the other is ... erm an Americanism. EEr ,,,, it is gas when it goes bang in the cylinder/s and before that it was gasoline, it's a liquid obtained by the fractional distillation of petroleum no gas no bang Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted May 5, 2020 Share Posted May 5, 2020 "Gasoline" is actually derived from "Cazeline", a U.S. trade name of the liquid refined petroleum, referred to as "Petrol" in this country. Calling it Gasoline is rather like calling all vacuum cleaners a "Hoover" - another U.S. trade name that's stuck. P.S. No disrespect intended to bhups or flight1. Just having a bit of fun at the expense of our American cousin's (mis)use of the ENGLISH language. Edited By Gary Manuel on 05/05/2020 02:20:10 Quote Link to comment Share on other sites More sharing options...
flight1 Posted May 5, 2020 Share Posted May 5, 2020 language is an involving thing, one can't be offended by it can one and it's still a gas that explodes when ignited Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted May 5, 2020 Share Posted May 5, 2020 Gas also explodes in a glow engine, a diesel engine, a jet engine and in a proper (CO2) gas engine but you don't call them all gas engines. How would you distinguish these types from one of your "gas" (petrol) engines? Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted May 5, 2020 Share Posted May 5, 2020 bhups - I forgot to answer your question - Sorry. Generally as flight1 says. Use mineral oil to start with and plenty of it and maybe slightly rich. Once it's running reliably on the ground, get it up in the air. Don't worry if it pops and burbles a bit due to running rich. After a couple of flights, start leaning it out a bit. After a gallon or two, switch to a good quality fully synthetic racing oil. edit - bin the supplied DLE spark plug in favour of NGK CM6. Change plug once fully run in. Edited By Gary Manuel on 05/05/2020 12:39:57 Quote Link to comment Share on other sites More sharing options...
bhups matharu Posted May 5, 2020 Author Share Posted May 5, 2020 Thank you guys! I was quite enjoying that🤣🤣 Quote Link to comment Share on other sites More sharing options...
Former Member Posted May 5, 2020 Share Posted May 5, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Stephen Smith 14 Posted May 5, 2020 Share Posted May 5, 2020 Posted by Jason Channing on 05/05/2020 15:24:27: Never yet had an engine where the fuel explodes ?????????????, Or me, in mine there all a controlled burn. Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted May 6, 2020 Share Posted May 6, 2020 In my opinion, flight1 is quite correct that all I/C engines use a series of controlled explosions to move the pistons down (and up). Choice of oil to use for running in will always be subjective (like a lot of things are). I think mineral oil helps to speed up the running in process. Quote Link to comment Share on other sites More sharing options...
extra slim Posted May 6, 2020 Share Posted May 6, 2020 I do the same as Gary as break in is a lot quicker, has worked for me perfectly, but each and to their own.. no right or wrong I guess Quote Link to comment Share on other sites More sharing options...
Former Member Posted May 6, 2020 Share Posted May 6, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Cuban8 Posted May 6, 2020 Share Posted May 6, 2020 Posted by flight1 on 05/05/2020 09:24:00: language is an involving thing, one can't be offended by it can one and it's still a gas that explodes when ignited Yes Jason, I always thought that it was petrol vapour that was being ignited......and that it burns and expands rather than explodes (detonation).................... Interesting stuff - saw a programme a while back that compared high explosives and low explosives. Edited By Cuban8 on 06/05/2020 09:49:30 Quote Link to comment Share on other sites More sharing options...
Gary Manuel Posted May 6, 2020 Share Posted May 6, 2020 Yep - changed my opinion. Petrol combusts rather than explodes. Even less reason to call petrol gas then Regarding the use of mineral oil during run in - it's subjective as I said, but HERE's Shell's explanation of why mineral oil should be used (in full size aircraft engines). Read up - there's plenty of (conflicting) info out there. I would never go so far as to say ignore a person that thinks this or says that. Make your own mind up. One thing that's not been made clear, regardless of which type of oil you go for. After the engine has warmed up, it's important to give it several 10 second or so blasts at raised power levels then let it slow / cool down for a few seconds between blasts. I generally do 3 or 4 blasts at half throttle, 3 or 4 blasts at 3/4 throttle, then half a dozen blasts at full throttle. This helps to seat and harden the piston rings / liner throughout it's full movement range (and is the main reason for using mineral oil). Once this is done, try to get a decent tickover and go flying. I'll probably be criticised for suggesting this way, but it's what I've found to work after much reading up. Worst thing you can do in my opinion, is to treat it with kid gloves and not give it full throttle. All my petrol engines have been run in this way and I've never had engine trouble. Quote Link to comment Share on other sites More sharing options...
bhups matharu Posted May 6, 2020 Author Share Posted May 6, 2020 Gary, sounds good! While we're on the subject of gas/petrol, any of you guys use copper or aluminium for your fuel tank tubing? Quote Link to comment Share on other sites More sharing options...
john stones 1 - Moderator Posted May 6, 2020 Share Posted May 6, 2020 No expert on oil myself, not read any insights off whoever, if Stihl market mineral oil, and recommend for their tools, I'm happy to take their advice. I do use Synthetic in my aero ones, again on advice of seller. Engines ? I've never had one break yet and all I've ever done is follow Instructions/Warranty. Run in ? I've done the mineral method and the rich synthetic method, no issues either way, I run on floor till it runs without revs going up n down, then go fly it, reason I don't run in straight away in the sky is, gravity, if it stops in wrong place, model may get broke and the engine. Quote Link to comment Share on other sites More sharing options...
Stephen Smith 14 Posted May 6, 2020 Share Posted May 6, 2020 I would never use mineral oil things have moved on. Back in the dim and distant past (late 70s early 80s) I was involved with racing tz250s and 350s which we ran with mineral oils manly castrol R. Move forward many years and my son followed my lead and went racing, now I know how my perant felt. He raced post classics for 3 years of his racing career this was on a tz350, this was capable of higher reves than the original bikes due to advances in ignition, expansion chambers, porting and combustion chamber. We ran purely synthetic oils in much smaller amounts as little as 50-1 as apposed to 20-1we ran when using minaral but at least doubled ring piston liner and crank life, admitted we ran nicasiled bores as apposed to early hard chrome but the increased life was about the same on all components. Quote Link to comment Share on other sites More sharing options...
Bruce Collinson Posted May 6, 2020 Share Posted May 6, 2020 I thought Castrol R was castor oil? I’m sure it was in 1966 when I bought a pint and mixed 3 pints of diesel fuel. Lovely smell. BTC Quote Link to comment Share on other sites More sharing options...
Former Member Posted May 6, 2020 Share Posted May 6, 2020 [This posting has been removed] Quote Link to comment Share on other sites More sharing options...
Stephen Smith 14 Posted May 7, 2020 Share Posted May 7, 2020 Back in the 70s castrol r was a mineral based oil with castor adatives if you looking at modern castrol r you will see its an entirely different oil. This info came to us via a sponser that was and still is a major oil blending company so I'm sure they know whats what. Quote Link to comment Share on other sites More sharing options...
Stephen Smith 14 Posted May 7, 2020 Share Posted May 7, 2020 Also modern castrol r is only suitable as a 4 stroke oil if your looking for a modern castor 2 stroke oil take a look at castrol 747 Quote Link to comment Share on other sites More sharing options...
Stephen Smith 14 Posted May 7, 2020 Share Posted May 7, 2020 A good low Ash 2 stroke is Millers KR2T Quote Link to comment Share on other sites More sharing options...
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