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Need some advice - 10/28/2003 4:50:33 AM   
yard-dart



Posts: 927
Joined: 3/6/2002
From: West Monroe, LA, USA
Status: offline 		Maybe you fuel Gurus can help me out, since I can't get much info out of the post that I left on the glow engines forum.

I have five little Enya .15 engines. I've only run two of them. The problem is that they run extremely hot. I kept blowing glow plug after glow plug. They would get so hot they would sizzle. I thought that the 10% nitro fuel was too much, so I went to 5%. Same problem, if not worse. I was just about to give up when someone asked what fuel I was running. They said that 5% was not enough, to go to at least 15%. I tried some 15% and things seemed to get better. The engines seemed to not run as hot and the RPM's seemed to pick up a bit more. Also, I've been running a medium heat plug.

My question.... Is it true that more nitro will actually make an engine run cooler? I've heard that before and from what I experienced, it may be true. My engine went from running hot on 5 and 10% nitro to not running as hot on 15%. I'm thinking about buying some 20% and giving it a try but I would like a bit more insight before making my purchase.

Any advice or info would be greatly appreciated,

John
       Post #: 1

RE: Need some advice - 10/28/2003 11:25:10 AM   
Hobbsy



Posts: 10683
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline 		John, I had an experience like that with my MDS 2.18, it had always run nice and cool. I ran out of Fox 5%-50/50 and dragged out an old jug of 5%-20% castor and the engine ran real hot, to make a long story short, the old jug had moisture in it. I ordered some new fuel and instantly had my cool running 2.18 back. You couldn't actually see moisture in the fuel or in the jug but I pulled the backplate and there were lots of water droplets in the crankcase and it was 70 degrees that day. Now no moisture accumulates in the crankcase. If those little engines have fairly high compression, and I think they do, more nitro will make them run hot.

< Message edited by hobbsy -- 10/28/2003 11:28:44 AM >

_____________________________

"I have gone faster backwards, upside down and on fire than most people have gone at all" Don Garlits

(in reply to yard-dart)
       Post #: 2

RE: Need some advice - 10/28/2003 2:07:20 PM   
Jim Thomerson



Posts: 2824
Joined: 10/9/2002
From: Austin, TX, USA
Status: offline 		Your Enyas are iron piston engines and thus like more oil than the usual ABC. 20% or more by volume, half or all castor. Also Enyas are notorious for taking a lot of break-in and then last forever. I suspect that your engines are not yet broken in and that you are not running enough oil to suit them. With more nitro you run a richer needle and therefore run more oil through the engine. This may be part of why nitro runs cooler.

Jim

(in reply to yard-dart)
       Post #: 3

RE: Need some advice - 10/28/2003 2:57:12 PM   
yard-dart



Posts: 927
Joined: 3/6/2002
From: West Monroe, LA, USA
Status: offline 		Jim,

Your reply makes perfect sense. These engines do, in fact, have steel pistons. I never really thought about them running hotter because of this. I am indeed going to start running 20% in them. I run only Cooper's fuel. The fuel I plan on using is 20% nitro with 20% lube(16%syn.4%castor). Now, you stated that the engine will run better on half, or all, castor. The only way I can even get close to that is to add some castor to the fuel. From the way the engine ran on the 15%, which has the same oil content as the 20% I plan on buying, I really don't think that much castor needs to be added. How much castor needs to be added to the fuel I've selected in order to help cool down the engine and be able to get peak performance out of the engines? I'm not trying to be tight, I just don't want to add any more than what is really needed. The castor I'm speaking of adding is the clear castor that can be bought at nearly any drug store. Is this kind OK to use?If so, how much do I need to add to a gallon of fuel?

Thanks for the help!

John

(in reply to Jim Thomerson)
       Post #: 4

RE: Need some advice - 10/29/2003 3:06:00 AM   
downunder



Posts: 3198
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		yard-dart....cast iron pistons need castor. IMO that 4% castor you're thinking of using is nowhere near enough. Just as an example, I once accidentally ran an old OS Max 35 on 20% all castor. Luckily I happened to be checking head temps at the time and shut it down when the temp soared past 195C (about 380F!!!). I switched to the usual 25% all castor and head temp dropped to about 125C. Your Enya may be able to handle less oil than that but I'd play it safe and start off with lots of castor then slowly reduce it as you get used to the engine. Drug store castor isn't suitable, you need either Klotz or Sig (or if you lived in the lucky country you could try some of my Castrol M ).

(in reply to yard-dart)
       Post #: 5

RE: Need some advice - 10/29/2003 2:42:51 PM   
yard-dart



Posts: 927
Joined: 3/6/2002
From: West Monroe, LA, USA
Status: offline 		Thanks for the advice downunder. As I stated before, I'll be using a fuel that is 20% oil(16%syn. 4% castor). How much castor do I need to add to this fuel to achieve a safe percentage? Do I need to lower the fuel level in the jug before adding extra oil? I'm new to mixing fuel or adding oil to already mixed fuel, so I don't know exactly how much to add. I know that there is 128.oz to a gallon, and I know how to get the percentages and ounces from a ready mixed gallon of fuel, but I don't know what kind of percetages I would have if I started adding to it. If you don't mind, help a fella out.

Thanks,

John

(in reply to downunder)
       Post #: 6

RE: Need some advice - 11/9/2003 9:23:19 PM   
Chinooker


 

Posts: 38
Joined: 11/4/2003
From: Gleneagle, CO,
Status: offline 		Contrary to popular belief, high nitro fuel do not make your engine run cooler. It can't be done without violating basic laws of physics and thermodynamics. All nitro does is provide a liquid that contains 50% oxygen content by weight. This allows more fuel to be burned through the engine. More fuel means more power. Heat and power output are directdly related. If your engine runs cooler on higher nitro it is probably the fact that the higher nitro fuel has a better oil package.

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Fly SPADS, because real airplanes aren't made of balsa either!

(in reply to yard-dart)
       Post #: 7

RE: Need some advice - 11/10/2003 7:59:19 PM   
yard-dart



Posts: 927
Joined: 3/6/2002
From: West Monroe, LA, USA
Status: offline 		UPDATE....

I have found the right fuel! I am now running Formula 15, which is made by FOX. It contains 18% all castor oil, 15% nitro, and 67% meth. The engine runs great now. It's pretty evident that the engine needed all castor. Thanks Jim and Downunder.

John

(in reply to Chinooker)
       Post #: 8

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