rednekk58

Hi All,

Wondering what other people are using. Plan on buying one of these in the next week or two. Run Cool Power 15% nitro in my 2 strokes. This will be my first 4 stroke. Question is can I add castor oil to my synthectic oil based fuel? Magnum requires 18% castor. If so how much castor? Should I try to find 4 stroke fuel?
Thanks
Al

Iflyglow

My Feedback: (79)

Rednekk58,
You can run coolpower (17 % oil), but I would definately add 2 OZ of castor. I run WC 20/20 with 1-1/2 OZ of castor oil. The engine will really wake up on 20%. I personally prefer WC extra premium (18% oil 80/20) over Cool Power any day of the week. If you have it available try it, and you will never run Cool Power again. Cool Power did not earn the name "Cruel Power " for no reason (17% oil). It has under the recommended oil % right off the bat.[X(]

Gizmo-RCU

My Feedback: (27)

I usually use Byrons 15% or similar with Castor/Syn. , all of your engines will like this mix. Unless you are really flying hard there is no advantage in the 20% stuff as it only hastens worn out engines. The Magnum 91 takes a while to really break-in, about 2 gallons for them to be really working, fly after several tanks (a little rich) and complete break-in flying.
Good luck

BTerry

My Feedback: (8)

This is the exception: The Magnum .91FS LOVES the 30% Heli mix from Cool Power. The heli blends have a lot more oil IIRC.

Other than this, I would also recommend adding a few ounces of castor to a gallon for your Magnum. The only engines I have that recommend ZERO castor are the YS engines, in which the bottom end is lubricated with fresh fuel (instead of combusted fuel that blows past the piston ring).

**edit** spell check

XJet

I seem to recall reading a while back that the Magnum 91RFS is prone to breaking crankshafts when you raise the nitro percentage to 20% or more.

rednekk58

Thanks for all the responses people. Anyone else have opinions?
I wiil add at least 2% castor. Is this usually available at local speed shops, or do i have to order online?
Thanks
Al

Ken6PPC

EVERYONE has an opinion. Opinions are like, well, you know......

Anyway, this one is mine:

I prefer Wildcat Premium Xtra over all other fuels I have tried. It has an 80/20 mix of synthetic oil and castor oil, with a total oil content of 18%. I use WC 15% nitro Prem Xtra in my 4S AND my 2S engines, and I don't have to add anything at all. Nothing like simplicity!

As for finding castor, SIG sells a very good castor, and your LHS might have some of that in stock. In a pinch, some have used medicinal castor that you can get from a drug store, but that is quite expensive per ounce. Also, there is some debate whether it is as good for your engine as castor that is marketed for glow engines.

Flyboy Dave

My Feedback: (21)

....why not use a fuel with plenty of castor in it in the first place ?

FBD.

Iflyglow

My Feedback: (79)

Xjet,
I ran 6 gallons so far of WC 20/20 through my Magnum .91 RFS, and so far no problems. I let it spin, it turns 10,500-10,600 peaked with an APC 14-6. I richen it back to 10,300 for flying. I have been really impressed with this engine, considering I bought a few of them for $119.00 a piece shipped during the big sale at Tower a couple of years ago.
I would try 30%, but my YS's put out plenty on 20/20 so I am not going to have different fuels sitting around.

cruzomatic

My Feedback: (17)

I use Powermaster 15/20 on all my Magnum 4 strokes. No problems. Great engines by the way.

rednekk58

Thanks for all the responses! Would like to ad 2 or 3 oz. of castor to a gallon of fuel and be able to use it in my 2 strokes also. Don't know if my LHS sells 4 stroke fuel.
I run 15% in my 2 strokes. I don't need or want to go to a higher nitro content. If I need more power, I'll go to a bigger engine.
Might put it on a U-Can -Do .46, a Hanger 9 J3, was at the LHS today and he had a used Dago Red P51 for $100 clams. Told him if he still had it in three weeks I'd take it. Maybe I'll give hime a deposit.
Thanks Again for all the good advice.
Al

submikester

My Feedback: (6)

At the start of this thread I had 2 of the 91s and when they put them on sale I bought a third. Good engines, I would classify them as 'average' in every way and average isn't bad. They are reliable, powerful enough if not a little on the heavy side. I've been flying one in my Sportsman Aviation Corsair the most lately and tomorrow for kicks I'm going to try a 15x6 wood prop.

rednekk58

Just finished odering one along with a qt. of castor from Towers 5 mins. ago. Let me know how the 15 x 6 works.
Dago Red is looking better all the time. I think I have a thing for P-51 's
What are you running for fuel?
Thanks
Al

panzerd18

I have a brand new one too. Would it run on 5% nitro with a OS Type F Glow Plug?

asmund

Yes it will, no problem. I have run my magnum 91 fs on many different fuels ranging from 0% nitro all the way to 30% and I am happy to say it runs fine on everything. I have no problems flying 3-D and doing hovering and tailtouches using 0% (straight/FAI) fuel once the needles are tuned correctly. The engine will however produce more and more power the more nitro is added.
As for oil it is a never ending discussion but my engine has been run on synth/cast (80/20) at a total of 15% and the last couple of years on 15% synth only. Never a problem and I don`t think I will ever wear this engine out, it holds compression when cold almost like an ABC engine.

I would say run whatever fuel you have at hand, with the exeption of your famous "cruelpower" I have no experience with that fuel, but after reading alot about it I can`t make myself to recommend it.

Typo[:@]

rednekk58

What''s wrong with cruel power? Thats all my LHS sells, without driving 40 miles to the next one.
Al

Iflyglow

My Feedback: (79)

Rednek,
The fuel has gotton the rep, because it has destroyed many engines. The oil is not the best on the market, and it is only 17%. Try some WC and you will never go back.

Ken6PPC

You could just use Cool Power, with s few ounces of castor oil added. I still prefer Wildcat, but if I HAD to use Cool Power, I would do so - but would add castor.

OTOH, many people swear by Cool Power. I just don''t think it protects the engines well enough.

Iflyglow

My Feedback: (79)

Ken,
There is so much of a difference, it is unbelievable. But if you must, just add some Sig AAA Castor, or Klotz benol. But you need to increase it by about 2 oz. Magnum's minimum requirements are 18% oil, and like I stated before CP is only 17% to start with.

XJet

It''s not so much the fact that there''s only 17% oil in it, it''s that the oil being used is not particularly good as a lubricant or protectant when compared to other more advanced synthetics.

Adding castor will help but if you use a decent quality oil you can actually drop to much lower percentages without any risk or penalty and thus enjoy cooler running, more minutes per tank, better idle, smoother transition and a little more power.

The only Morgans oil we''ll dare to use around here is the synth/castor blend that goes into Omega fuel and even then only because it is 30% castor.

panzerd18

The majority of the premixed fuel I have seen over here is not Cool Power but various brands with Cool Power synthetic oil mixed in with locally sourced methanol and nitro. Most of the engines I see all run the Cool Power oil with not problems. It is mixed in at 18%.

blw

My Feedback: (3)

Maybe you can ask for a case the next time your LHS places an order. I like buying it by the case myself.

mrbigg

My Feedback: (21)

I''m with you.

carrellh

Al,

Cool Power and Omega are both made by Morgan Fuels. Omega has pink dye compared to the green in Cool Power.
Omega has 17% total oil and that oil is a 70/30 synthetic/castor ratio. If the LHS only buys from Morgan, and you want fuel with castor already in it, they could get some Omega for you the next time they order.

I have three Magnum four strokes, and my brother has five or six. We use fuel with no castor oil (Magnum, Ritch''s Brew, Wildcat) and have had no issues.

Ken6PPC

I have used Cruel, err I mean Cool Power......

It is cleaner. However, I had rather have a dirty plane with an engine that runs, over a clean plane that needs a new engine.....