Magnum 4 Stoke Fuel

Magnum 4 Stoke Fuel (Full Version)

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danieldrake -> Magnum 4 Stoke Fuel (9/26/2005 12:58:29 AM)
I have a couple of different four strokes. I have a Saito .72, they say run pure synthetics so I run 20/20 Heli fuel in it and it runs great, smokes great, and stays cool. I also have a Magnum .91; they say NOT to run pure synthetics because it may damage the engine so I run Omega 10% through it (still breaking it in), but it gets a little hotter than my saito and it certainly does not smoke as much, even when running rich. So what is the best fuel to run in a broken in Magnum four stroke engine? Is anybody running pure synthetics, will the Heli blend work without damaging the engine?

Motorboy -> RE: Magnum 4 Stoke Fuel (9/26/2005 12:20:34 PM)
In the Magnum engine are best to run 10-15% nitro and 18-20% castor. I has SC FS 91 AR and it is same engine as Magnum. Both engines come from same factory Sanye Mfg. Jens Eirik

Kema -> RE: Magnum 4 Stoke Fuel (9/27/2005 4:56:15 PM)
Just run pure synth. Running all castor blend just ruins your engine in a long run. If you are castor believer add percent or two to synth fuel mix for your own peace of mind :) 10-15% nitro is mostly used, but using even 20% isn't that harmfull either.

Motorboy -> RE: Magnum 4 Stoke Fuel (9/27/2005 9:48:04 PM)
Kema.. 20% nitro are not to use in Magnum/SC/ASP 4 stroke engine, you will spend more money at higher nitro. quote: Running all castor blend just ruins your engine in a long run. No, can not ruin the engine of castor oil. Castor oil are recommented of Sanye Mfg to theirs model engines. In the extreme 4 stroke as to example Saito or YS need syntetics oil cause carbon build up in valves of high exhaust temperature if pure castor oil used. If you has warranty at the engine, respect the instruction about fuel/oil or the warranty will be void. I live in Norway and we has 2 year warranty at our model engines, therefore better to use fuel recommented of model engine factory. Jens Eirik

Kema -> RE: Magnum 4 Stoke Fuel (9/28/2005 10:15:39 AM)
Well I have seen enough gummed engines runned on castor. Motorboy's words are from the past. Usually just REALLY old flyers stick to damn castor and try to recommend it to everyone else because they use it. Use the synth and welcome to the year 2005 :)

Hobbsy -> RE: Magnum 4 Stoke Fuel (9/28/2005 1:30:00 PM)
KEMA, I have to disagree with you, when I got my first fourstrokes, an Enya .46 MKII, a high compression Saito .80 and a Saito 1.50 I ran them on Fox 15% nitro fuel with 20% castor for 3 years. I have also run them on Fox fuel with 50/50 lube. None of them got gummed up, the exhaust valves became a light golden color and that is all that happened. Running them on castor when new may have been a good thing because all three of these engines hold compression like an ABC engine.

Motorboy -> RE: Magnum 4 Stoke Fuel (9/28/2005 5:17:47 PM)
Kema.. Read here why Castor oil are better: http://modelenginenews.org/faq/index.html#qa5 Jens Eirik

Kema -> RE: Magnum 4 Stoke Fuel (9/28/2005 6:05:33 PM)
quote: ORIGINAL: Motorboy Kema.. Read here why Castor oil are better: http://modelenginenews.org/faq/index.html#qa5 Jens Eirik I guess that you are a member :) Well read the last chapter again... With older engines using castor maybe the only solution because of poor tolerances and years of wearing because of castor. Gumming castor really helps to make these 50's engines to run again. When you clean an engine runned with castor the compression is mostly lost for ever. When ringed engine compression feels like ABC, there is something already wrong. But you can always change bearings, piston, cylinder(or sleeve) and piston ring :) Should you use castor in a brand new modern engine? NO...

Motorboy -> RE: Magnum 4 Stoke Fuel (9/28/2005 7:29:18 PM)
quote: ORIGINAL: Kema Should you use castor in a brand new modern engine? NO... In ABC/ABN engines and other modern engines with crome- or nickelplated in steel cylinder or cylinder of aluminium with crome- or nickelplated surface + cast iron ring are not problem to use fuel with synthetics oil. You forget there are still modern modelengines with steel sleeve and cast iron ring who need castor oil to smear and keep longer.. and there are steel parts who are running togheter to example valve gear/can+lifter in 4 stroke engines.. Some brands of 4 stroke engines har problems with lubricating in valve gear/ cam+lifter in four stroke engines and need some percent to 50 or more percents castor oil added in synthetics oil to bond metal surfaces and make strong oil film. quote: With older engines using castor maybe the only solution because of poor tolerances and years of wearing because of castor. Gumming castor really helps to make these 50's engines to run again. No, these older engines has tight tolerance between piston/sleeve while ABC/ABN are more tighter in TDC and looser in BDC. The aluminium piston with ring are more looser fit in sleeve due temperature in piston calculated of sizes in cylinderbore. I has allways used castor oil in my engines Webra T-4 (1980) and OS FS 40 (1987) and never replaced spareparts. Still good compression. quote: I guess that you are a member I am not member there, but i am model engine builder. Jens Eirik

Hobbsy -> RE: Magnum 4 Stoke Fuel (9/28/2005 7:59:19 PM)
KEMA, I bought those engines in 1991 not 1950, none of them has ever needed bearings, a couple of years ago I bought an MDS 1.48 that had been run exclusively on sythetic lube. There was no vizible lube inside the engine and the bearings were rusty and the ring was rusted to the cylinder. I run 20%nitro with 75/25 syn/castor blend in my YS's also and no harm is done.

mentorman -> RE: Magnum 4 Stoke Fuel (10/23/2005 4:56:33 AM)
I too must agree with hobbsy, typically ringed engines to tend to leak down when turned over by hand. On all my saitos, they hold commpression like an ABC, there is nothing wrong with them, those who dont know saito wont know that. Magnum, SC whatever the make, do leak down. My magnum has horrible compression when turned by hand, but it runs very well, two different motors, diiferent feel, both normal.

Motorboy -> RE: Magnum 4 Stoke Fuel (10/23/2005 5:30:27 AM)
quote: ORIGINAL: mentorman I too must agree with hobbsy, typically ringed engines to tend to leak down when turned over by hand. On all my saitos, they hold commpression like an ABC, there is nothing wrong with them, those who dont know saito wont know that. Magnum, SC whatever the make, do leak down. My magnum has horrible compression when turned by hand, but it runs very well, two different motors, diiferent feel, both normal. This is normal in 4 stroke engines, because we need oil transfered to crankcase through pistonring gap. Jens Eirik

vlizard -> RE: Magnum 4 Stoke Fuel (10/23/2005 4:44:10 PM)
Most engine manufacturers I have seen reccommend at least a little castor. Also, I have read in an other posting that one of the reasons a lot of fuel manufacturers pushing straight syhthetic and or lower oil percentages is that the lube is the most expensive thing in the bottle or can. I agree that engines are tighter now than in the past, that is why I can understand 80/20 syn castor mixes instead of 50/50. Sooner or later we all will have a lean run though. But no matter what lube packages your runnin'. Use after run oil! It will save you a lot of headaches and money. Use more than the few drops mentioned in the instructions too. I'm have gone to the Dextron or Mercon mention by a lot of people in other postings. The Hobbico I bought looks and smells just like it! The atf is a whole lot cheaper.[:D]

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