Castrol or Synthetic Oil  
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All Forums >> Glow Engines, Gas Engines, Fuel & Mfg Support Forums >> RC Fuels >> Castrol or Synthetic Oil
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Castrol or Synthetic Oil - 4/11/2005 5:23:22 PM   
olgoat


 

Posts: 34
Joined: 3/2/2004
From: Round Rock, TX, USA
Status: offline 		I have a GMS 76 that runs great but has always put out alot of black oil. The engine has had at least 10 gal. of fuel thru it. I use 10% nitro with a castrol/synthetic blend. I thought of switching to a full synthetic oil for fear of the castrol not providing enough lubrication. One person at the field I go to told me that castrol lubricates better then synthetic but I always thought the opposite. I would like some more opinions.

Lonnie

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Normal people say "If it ain't broke, don't fix it"
Engineers say "If it ain't broke, needs more options
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RE: Castrol or Synthetic Oil - 4/12/2005 4:40:09 PM   
Jarsu


 

Posts: 33
Joined: 8/4/2003
From: Oulu, FINLAND
Status: offline 		First, Castrol is a name for an oil manufacturer, so it is castor oil we're talking about. If your engine is not gummed up by the castor in the blended oil, there is no risk in moving to an all synthetic fuel, provided there is enough synthetic oil, I'd go with ~20%. Your friend is partially right, castor lubricates better in very high temperatures, where synthetic oil has evaporated or burned away (this might be the case if you have eg. a lean run) but in normal operating temperature, a good synthetic oil is at least as good a lubricant as castor oil, plus it doesn't gum your engine or leave a nasty mess on your plane.

(in reply to olgoat)
       Post #: 2

RE: Castrol or Synthetic Oil - 4/13/2005 3:02:50 AM   
RC-Captain



Posts: 2931
Joined: 11/12/2002
From: RCHill, NJ, USA
Status: offline 		EXcuse my ignorance, but is castor the same stuff my mom used to give when I was young to prevent me from getting sick ?

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RE: Castrol or Synthetic Oil - 4/13/2005 4:45:40 AM   
downunder



Posts: 3015
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		Yep, it's the same stuff except the medicinal castor has been refined just a little more and some say it's got a bit of added sugar.

The Castrol company started about 100 years ago making castor oil and that's where their name came from (CASToROiL).

When a synthetic reaches a certain critical temperature it suddenly breaks down back into all the chemicals that were used to make it. None of these were lubricants and they just burn up. When castor reaches a critical temperature it breaks down too. But it breaks down into another lubricant. Then this lubricant reaches a critical temp and breaks down into yet another lubricant. This is part of the reason it's so much better at protecting the engine if you have a very lean run.

I've never yet seen castor come out black so I'd suspect there's a bit of metal to metal wear going on and the most likely place is the muffler, either where it attaches to the engine or a loose baffle inside.




(in reply to RC-Captain)
       Post #: 4

RE: Castrol or Synthetic Oil - 4/13/2005 5:01:03 AM   
RC-Captain



Posts: 2931
Joined: 11/12/2002
From: RCHill, NJ, USA
Status: offline 		Thanks Downunder for answering my question despite me disagreeing with you experiment

You seem to be very informed about RC engines.

Now for the hard queston, why cant we use a blend of petroleum or gas, with regular motor oil in these little RC engines ?


good luck.

_____________________________

I finally broke bread and bought a real charger , THE TRITON 2............

(in reply to downunder)
       Post #: 5

RE: Castrol or Synthetic Oil - 4/13/2005 5:34:37 AM   
Motorboy



Posts: 1617
Joined: 2/7/2004
From: Bergen, NORWAY
Status: online
quote:

ORIGINAL:
I've never yet seen castor come out black so I'd suspect there's a bit of metal to metal wear going on and the most likely place is the muffler, either where it attaches to the engine or a loose baffle inside.



If it is pure black without metalparticles, so the oil has burned to soot/carbon.

Jens Eirik

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Jens Eirik
All landings are just controlled crashes!

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       Post #: 6

RE: Castrol or Synthetic Oil - 4/13/2005 5:43:13 AM   
olgoat


 

Posts: 34
Joined: 3/2/2004
From: Round Rock, TX, USA
Status: offline 		Thanks Downunder, That sure clears thing up. It runs great so I guess if it aint broke, I shouldn't try to fix it.

Lonnie

_____________________________

Normal people say "If it ain't broke, don't fix it"
Engineers say "If it ain't broke, needs more options

(in reply to RC-Captain)
       Post #: 7

RE: Castrol or Synthetic Oil - 4/13/2005 5:05:48 PM   
downunder



Posts: 3015
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		Just to be sure, what I'd do (if possible) is to give it a run without the muffler and catch the oil coming out on a sheet of white paper. You'll have to open the needle valve maybe another turn or so because there'd obviously be no muffler pressure but it'll run fine on the bench or in the model. It'll be noisy though

RC-FIEND...it's quite possible to mix a small amount of petrol in the fuel and this used to be done on a regular basis for the old glow powered CL team race models, from what I've heard up to about 10% or so. But this was only done to increase the range on the limited tank size and was a tradeoff with the slightly less power. There's no point doing it for sport flying though because the savings in fuel costs would be very small but there's no reason why you can't experiment with it...just don't tell anyone cos you know what happens then.

(in reply to olgoat)
       Post #: 8

RE: Castrol or Synthetic Oil - 4/14/2005 1:08:29 AM   
RC-Captain



Posts: 2931
Joined: 11/12/2002
From: RCHill, NJ, USA
Status: offline 		LOL yea I know what happens, but I wonder how many people would stick by me doing the experiment.

Anyway, way back when I knew my DAD used regular gas to run the CL cox engines. But my main concern is how much hotter does petro burn compared to nitro. it might melt the diecast crankcase.

Maybe one day fellow myth buster.....


< Message edited by RC-FIEND -- 4/14/2005 1:10:25 AM >

_____________________________

I finally broke bread and bought a real charger , THE TRITON 2............

(in reply to downunder)
       Post #: 9

RE: Castrol or Synthetic Oil - 4/14/2005 5:26:46 PM   
sajjad


 

Posts: 17
Joined: 12/12/2004
From: Rowlett, TX, USA
Status: offline 		For the present ABC Engines 18% lubricating oil is sufficient. Older design engines need more.
The 18% consists of 20% of Castor Oil and 80% of Synthetic oil. Pure synthetic oil evaporates quickly at high temperatures so Castor Oil must be added to save the engine and prolong its life span. Never use pure synthetic all alone.

Sajjad

info from Fly RC June 2005

(in reply to RC-Captain)
       Post #: 10

RE: Castrol or Synthetic Oil - 4/14/2005 9:24:57 PM   
Jim Thomerson



Posts: 2724
Joined: 10/9/2002
From: Austin, TX, USA
Status: offline 		I seriously doubt your DAD ran Cox engines on regular gas. Maybe your memory is as tricky as mine is.

Jim

(in reply to sajjad)
       Post #: 11

RE: Castrol or Synthetic Oil - 4/15/2005 4:41:55 AM   
downunder



Posts: 3015
Joined: 10/10/2002
From: Adelaide, AUSTRALIA
Status: offline 		I'm with Jim there, it's either a memory lapse or a misunderstanding from way back when. The thought just came to me that maybe your dad was saying he was going to "gas" up the tank. Now I know you Americans call petrol "gas"....

(in reply to Jim Thomerson)
       Post #: 12

RE: Castrol or Synthetic Oil - 4/18/2005 12:50:13 AM   
jeffk464


 

Posts: 1153
Joined: 10/31/2004
From: cerritos, CA, USA
Status: offline 		Downunder

You mentioned running petrol(gas) in a glow engine. I want to give this a try but dont have any extra glow style oil. Can I safely add say 5% gas to a gallon of off the shelf 10% nitro glow fuel. The fuel I have has 18-20% oil in the mix so I dont think adding 5% gas would lower my oil content that much. Anyways, what do you think, would it be hard on my engines?

(in reply to olgoat)
       Post #: 13

RE: Castrol or Synthetic Oil - 4/18/2005 1:22:16 AM   
RC-Captain



Posts: 2931
Joined: 11/12/2002
From: RCHill, NJ, USA
Status: offline 		Maybe a memory lapse , or maybe a gas engine . but the sense of smell is the the best way to remember things. So thats all I remember.

_____________________________

I finally broke bread and bought a real charger , THE TRITON 2............

(in reply to jeffk464)
       Post #: 14

RE: Castrol or Synthetic Oil - 4/18/2005 8:42:15 AM