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Enya SS40.....fuel

What fuel?

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Doc Marten28/09/2020 22:50:34
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I've just bought a used plain bearing Enya, I've always hankered for one but never got around to owning one, now I know these have a steel liner and iron piston which required 20% castor when they were new but do I really still need a castor based fuel to run it or have modern synthetics made castor obsolete in this case?

paul d29/09/2020 07:19:06
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I had one of those years ago, no ball of fire but ultra reliable, never wore mine out despite hours of use. If it was mine I would stick to 20% castor fuel with 5% nitro.

brokenenglish29/09/2020 07:31:21
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Posted by paul d on 29/09/2020 07:19:06:

I had one of those years ago, no ball of fire but ultra reliable, never wore mine out despite hours of use. If it was mine I would stick to 20% castor fuel with 5% nitro.

I agree. The real question is, do you want to be sure, or do you want to take a risk, knowing that, if you're wrong, you'll only find out when it's too late...

You've got a nice old engine... so run it like a nice old engine.

Graham Davies 329/09/2020 08:47:05
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I've had one of these for 30+ years! I was an impoverished 'yoof' when it came into my possession in a secondhand pitts special that lasted approximately 20ft from first take off! Following that, the Enya graced the pointy end of many, many models. It was and still is a great engine.

Point is, I ran it on all sorts of nonsense when I didn't know better, and it still runs fine today! I seem to recall running it on 5% nitro (because that was my defacto choice..) and either straight 20% caster as has been mentioned, or 18% 50/50 caster ML70, if I recall.

Or a mixture of aftershave and chip fat. Times were hard you know...

Graham

edgar29/09/2020 08:52:31
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I had one from Steve Webb's, they recommended fully synthetic when I bought it, the manual Here says castor or synthetic. I hope it helps.

J D 829/09/2020 09:26:40
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I stopped using mainly castor based fuels years ago apart form some that have a small percent of castor in them.

All my engines run on the same fuel, from Enya 90 four strokes down to old OS max 15's [ plain bearing's ] and including an SS40 with no problems.sam_1477.jpg This old Cox thimble drome rescued from a box of junk was happy running on synthetic oil 5%nitro .

Robin Colbourne29/09/2020 10:28:25
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I had an Enya SS30 on which I put many hours in a trainer I used for instruction. I used Southern Modelcraft's '5% Double Lube High' fuel, which had 9% castor and 9% synthetic oil in addition to the methanol and 5% nitromethane. It was a while back, but I don't recall any problems with it.

kc29/09/2020 14:00:09
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I dont agree about the comment " they were no ball of fire" I found my 2 Enya 40SS plain bearing were up around the same power as OS40 ball bearing engines. That is to say much more powerful than OS 40 FP. The Enya 30SS plain bearing was as powerful as the average 40 too. And the plain bearing Enyas last forever!

I always used straight castor - no nitro. Still running OK last time I used them before I switched to electric. I won't sell them but would sell the OS though.

Graham Davies 329/09/2020 14:08:07
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I agree kc; my ss40 had plenty of power. I have a 40FP too and completely agree. The 40FP is a very pleasant engine, but the Enya had mojo...

wingcoax29/09/2020 15:53:43
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I am currently re-furbing my ss40 after a 15 year layup. It is approx 40 years old and has only had one new bearing over that time. I ran it on SMC 5%. It used to be in a ROBBE PUMA, not a light model but did very well.

Doc Marten29/09/2020 19:02:49
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Do you all still use castor because that's what you always have?

Enya always stated that good quality synth can also be used back in the 80's-90's when these were new, with the huge advances in oil technology I'm interested in why you still use Castor?

I get the "run it as it was intended" train of thought but if there is better available then why not use it? A restored car from the 40's would've run on monograde mineral oil, why run it on that now when there is superior available?

BTW, the SS40, like most Enyas' have a reputation for the power they deliver over and above other like for like plain bearing engines in the same bracket including OS,with the bonus of lasting longer than a Galapagos tortoise.

paul d29/09/2020 21:04:02
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A car from the fortys would soon go bang if lubricated with a modern 0w10 synthetic oil, I honestly think brokenenglish gave the best advice but at the end of the day it's yours to do with as you please, one thing I do remember from my ownership is that it took a age to run in.

Doc Marten29/09/2020 23:21:59
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Posted by paul d on 29/09/2020 21:04:02:

A car from the fortys would soon go bang if lubricated with a modern 0w10 synthetic oil, I honestly think brokenenglish gave the best advice but at the end of the day it's yours to do with as you please, one thing I do remember from my ownership is that it took a age to run in.

0-10 is an extreme unless you have a race engine, most modern road cars would suffer on that. I'm sure you really knew I meant a suitably graded synthetic?

Enya have always said good synth is fine, I'm curious as to why everyone is reluctant to use it even now.

 

 

Edited By Doc Marten on 29/09/2020 23:25:55

Maurice Dyer30/09/2020 10:14:06
106 forum posts

Used Enya for years. Whoever said no ball of fire is wrong. Plenty of power and bullet proof tough.

SMC 5%. Gallons of it. Forget castor.

Maurice

Doc Marten30/09/2020 10:44:07
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At the moment I plan use the SMC Laser mix unless there is a convincing debate not to Maurice but because of the comments advising Castor I'm now interested as to why Enya users are shy of synthetic.

Engine Doctor30/09/2020 11:00:26
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Posted by Doc Marten on 29/09/2020 23:21:59

0-10 is an extreme unless you have a race engine, most modern road cars would suffer on that. I'm sure you really knew I meant a suitably graded synthetic?

Enya have always said good synth is fine, I'm curious as to why everyone is reluctant to use it even now.

Hi Doc . This is my take on it . I don't intend to upset any fellow modelers or start ANOTHER Castor /Synthetic oil war of words, .smiley

You will always meet modelers who have grown up using castor and wont change or try synthetic based fuels due to various old wives tales and myths .Most of the flyers I know who use castor use it because its cheaper and will make up all sorts of reasons not to use synthetic oil based fuels in their modern engines .

Reasons NOT to use Castor based fuel : Technology has moved on and modern engines produce more power and hence more heat. By heat I don't mean touching the casing to test it , I mean internally during combustion etc . Castor oil when burnt produces carbon and when overheated coats moving parts in a sort of varnish that in turn causes more friction and more heat and ultimately engine failure . Looking at older engines internals that were made when the technology was changing fast back in the seventies and eighties the results of overheating and castor oil were all too often plain to see. It resulted in Pistons coated in a black carbon coating , or a thick brown varnish . other engine parts were also affected. Ducted fan engines of the day were short lived due to the revs and heat build up often causing piston failure . When this coating was visible the damage was done and parts needed replacing. Castor in four-stroke engines was just as bad causing thick build up of carbon on the valves and in the ports . Castor oil would set like gel in the cam gear causing cam or cam follower failure . It also baked on the outside of the engines making them look like a well used chip pan , remember them ? Even fuel with 2 or 3% castor added will cause carbon build up and a messy engine

Synthetic oil back in those days were a bit hit and miss but again technology has improved and engines run better and last longer on the modern synthetic oils . Look at the posts by John from Laser engines . He has been testing engines on fuel with 5% oil ! and they run perfectly well .Allso strip a modern engine down after hours of running on a modern synthetic based fuel and the piston crown will usually be spotless. That would of been unheard of forty years ago. Engines run on synthetic fuel are also easier to keep clean externally as the oil resists heat and doesn't set to a varnish or burn on like castor oil.

Even when synthetic oil does burn its generally low ash and leaves virtually no carbon build up hence why modern engines and car engines don't need regular de-cokes and run for incredible mileages

Reasons to use castor based fuel. Castor oil has its place in old engines that were designed for it and generally didn't have the tighter tolerances of modern engines with ABC piston liner set up .Also use Castor based fuel for engines with iron piston liner technology that have been run for some time on castor based fuels . On these engines the piston will likely be coated with a glaze of castor that permeates into the pores of the iron , creating a seal to give a good compression. Run an engine like this on modern synthetic based fuel and the fuel will quickly clean away the varnish and the engine will lose compression

 

Edited By Engine Doctor on 30/09/2020 11:12:09

paul d30/09/2020 11:36:24
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Very well explained, so in Doc's case he should run his enya on castor ( unless it's new of course)...

Jonathan M30/09/2020 12:07:27
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Agreed - excellent post Engine Doctor - I've learnt hugely from this.

GONZO30/09/2020 14:26:49
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Another personal plus for castor is it gives you soft handswinklaugh

Doc Marten30/09/2020 14:47:59
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Thank you ED, that's exactly the kind of reply I was waiting for, factual backed by engineering and science, positives and minus, so it looks like I may be adding some castor oil to my Laser mix. There's still a niggling question though, if castor is needed with an Iron/Steel combo then why would Enya recommend synth for all these years?

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