RE: More Q&A

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RE: More Q&A - 1/2/2004 5:48:40 PM

fhm101

Posts: 2464
Joined: 12/22/2003
From: Pinson, AL, USA
Status: offline

quote:

ORIGINAL: Fuelman

I am printing a list of some of the questions and my private replies that people have asked through e-mail to me.
Q: Why coil the pressure line on car & buggy engines...
A: I can not think of one valid reason why. Some prominate "Car" expert probably did it just to see if everybody else would follow. Or it could have probably been cooked up by the fuel tubing manufacturers. Just my opinion. (a little humor here folks)

I think coiling pressure line on cars is simply a way to keep it out of harms way. Pressure line length however is important, at least in car applications.
I'm sure there have been reasons for this already posted, but I'm new here so I'll tell you what I've heard, read, and experienced first hand on the subject. The late great Ron Paris said pressure line length was a useful tool for fine tuning transitional response in onroad cars. He also said it was a tiny gain and best left to expert tuners. My own personal experience with this has been that a short pressure line will cause a big (.21 and up) car engine to run lean below half a tank of fuel and also has an effect on how these engines idle. A longer line will help a car engine fall to idle faster which is critical to clutch engagement, or rather disengagement when you come off throttle. Also, the smaller engines used in 10th gas cars and trucks are more prone to flameout with a short pressure line. Why? I don't know, it's just things I've learned from experience.

< Message edited by fhm101 -- 1/2/2004 12:52:29 PM >

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Post #: 76

Rc Fuel Faq (in reply to Fuelman) - 1/25/2004 9:18:26 PM

Hobbsy

Posts: 10135
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline

There used to be a so called RCV expert frequent these pages who claimed that using more than 15% lube would put the engines on the verge of hydro-lock. I didn't buy it. I ran my RCV .58CD and .90SP on Wildcat Premium 10%nitro with 16% 80/20 lube and then on 15% WildCat Premium Extra 15% nitro with 18% 80/20 lube, they both ran exactly the same on both except there was noticably more oil comming out of the breather. I know that isn't exactly scientific, but it proved my point, at least to me. And, I don't think it was my imagination that the gears in both were quieter on the 18% lube.

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Post #: 77

RE: Changes? - 1/29/2004 3:45:38 PM

Fuelman

Posts: 980
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline

FHM 101:
I appreciate your sharing the above info on fine tuning the exhaust pressure line. Maybe with that post, a few folks could really put the theory to work and jump to the next higher level of engine tuning knowledge. I have given that same theory some thought and previously dismissed it as not enough difference in running characteristics after I did my simple test (which of course was not a hard data collection experiment). Thank you for sharing that.

Hobbsy:
I am far less experienced with the RCV engines than the person you are reffering to which operates the RCV USA Service center. However, I have run them extensively in developing fuel blends that best maximize the RCV's potential and have discovered that Otto is absolutly "on target" with his recommendation of a little less oil also, the manufacturer of RCV does suggest lower oil contents than most of the model engine world suggest and this is for a reason. They will tend to experience detonation much easier when using fuels with more oil than they recommend and run hotter. Castor oil is also very important in the operation of these engines, a slight varnish on the piston is necessary for optimal running habits, longevity and power of these engines. This is not to say that runnig the engines on off the shelf high oil fuel can not be done, it can, you just need to be aware of the detonation gremlin and take steps to eliminate it if it creeps up.

Fuelman

(in reply to Hobbsy)

Post #: 78

RE: Changes? - 1/31/2004 2:18:57 PM

tailskid

Posts: 5413
Joined: 11/30/2001
From: Tolleson, AZ, USA
Status: offline

Hey Fuelman....it's Jerry here, a long way from Alabama! Moved here about 6 months ago....gotta go, no time for chatting - it's flying time. Oh, did I mention it will be about 70 degrees and sunny today? Too bad about the Michigan weather this time of the year

Jerry Festa

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Post #: 79

RE: Changes? - 1/31/2004 3:50:33 PM

Fuelman

Posts: 980
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline

Nice to hear from ya Jerry.
shoot me an e-mail with your phone number. I would assume you're out of Nitro Scent and Fuel by now.

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Cooper Fuels LLC

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Post #: 80

RE: Rc Fuel Faq - 2/1/2004 6:52:05 PM

leandro

Posts: 29
Joined: 1/31/2004
From: powhatan, VA, USA
Status: offline

what is the most popular fuel for nitro cars and trucks out there?????

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Post #: 81

RE: Changes? - 2/2/2004 1:15:59 PM

Fuelman

Posts: 980
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline

Leandro;
Since you are in the UK, I would not be as familiar with your selections since I'm in the US. Ask around and see who is having the best satisfaction with which fuels available to you.

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Cooper Fuels LLC

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Post #: 82

RE: Rc Fuel Faq - 2/16/2004 1:39:04 PM

locolobot

Posts: 131
Joined: 12/25/2002
From: Lenoir City, TN, USA
Status: offline

Thanks for all the god information. I just need one more item solved. What is the best ARO to use in my four stroke engines? If I am going to store them for weeks at a time (like over the winter) can that same oil be used safely? I have heard that most ARO's and marvel miracle oil cannnot be safely used when storing your engines over the winter as they soften the silicone seals and gaskets used in the engines. Is this true?

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Post #: 83

RE: Changes? - 2/16/2004 3:10:29 PM

Dr Nitro

Posts: 162
Joined: 11/12/2002
From: The Great Midwest, USA
Status: offline

locolobot,
Rislone engine treatment works great and almost any air tool oil out there, when you have engines that are not pumped like the YS's or anything like a it. The above listed products work great in your typical OS, Enya, Saito, TT, Magnum and ASP 4-strokes. Just squirt it into the crankcase breather nipple and flip it over to distribute the oil.

If you have a pumper engine, I use Cooper's Formula 49 ARO/PRO, but it is expensive. Otherwise, get some Mobil One or Castrol Syntec, past experience has shown me that they do not cause problems in YS engines.

(in reply to locolobot)

Post #: 84

RE: 4 stroke fuel? - 3/6/2004 9:47:41 PM

hatnikman3

Posts: 54
Joined: 12/31/2003
From: Newbury, MA, USA
Status: offline

Fuelman,

I'v seen Tower hobbies selling 4 stroke blend fuel advertized w/ more oil. I have a new O.S 1.20 that still needs breaking in. I purchased Morgan Omega 10% nitro for my O.S 46 2 stroke (readily available to me) & was wondering if it is OK for the 1.2 four banger. The Omega label says nothing at all about oil content!! From what I have read here, Omega is castor/syth. mix. If Omega is not suitable, could you recommend a fuel for the 4 stroke. Thanks in advance for any info, Nick

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Post #: 85

RE: Changes? - 3/7/2004 2:46:43 AM

Hobbsy

Posts: 10135
Joined: 12/2/2001
From: Colonial Beach, VA, USA
Status: offline

I have opened engines up after sitting for 5 years with Corrosion X in them and the inside of the engine and the C X look like the day I put it in there.

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Post #: 86

RE: Rc Fuel Faq - 3/24/2004 1:48:45 AM

markcobb

Posts: 1
Joined: 3/23/2004
From: , GA, USA
Status: offline

What is the difference between heli 15% and regular 15% and can you run heli 15% in your airplane. Will it hurt the engine.

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Post #: 87

RE: 4 stroke fuel? - 4/15/2004 9:44:27 PM

Bax

Posts: 11586
Joined: 4/26/2002
From: Champaign, IL, USA
Status: offline

quote:

ORIGINAL: nkypockets

Fuelman,

I'v seen Tower hobbies selling 4 stroke blend fuel advertized w/ more oil. I have a new O.S 1.20 that still needs breaking in. I purchased Morgan Omega 10% nitro for my O.S 46 2 stroke (readily available to me) & was wondering if it is OK for the 1.2 four banger. The Omega label says nothing at all about oil content!! From what I have read here, Omega is castor/syth. mix. If Omega is not suitable, could you recommend a fuel for the 4 stroke. Thanks in advance for any info, Nick

Don't worry about your fuel. Omega 10% 2-stroke fuel in your four-stroke engine is fine. If you set the engine properly, you'll get a lot of good use out of Omega fuel...and you'll only have one kind to worry about.

Tower Premium fuels are advertised as having 18% oil content.

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3002 N. Apollo Dr. Ste. 1 Champaign, IL 61822 USA
Service Phone: 217 398-0007
Email: hobbyservices@hobbico.com

(in reply to hatnikman3)

Post #: 88

RE: 10% and 15% sin-and caster - 4/23/2004 6:04:23 PM

iflynething

Posts: 1910
Joined: 8/23/2003
From: Charlotte, NC, USA
Status: offline

im using 15% sin. in a os 46ax wonder if 10% sin- caster would be better and what would be the
diff. ? i run it in a something extra most of the time at half throth .... how should i tune it being that i run most the time at half?

< Message edited by iflynething -- 4/23/2004 1:09:18 PM >

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Michael Carr
Funtana, S100, Fut. 3050 / Rap 30, OS 32, JR 537, Fut. 401

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Post #: 89

RE: Changes? - 5/6/2004 12:44:09 AM

Fuelman

Posts: 980
Joined: 12/31/2001
From: Jordan, NY, USA
Status: offline

Thanks for everybodies patience, been a bit busy lately and have not been able to visit the forum.
Bax, thank you for stepping in and answering a question.

Markcobb,
15% airplane and heli fuel for most companies is the same thing. Every company I know of refers to heli blends as being all synthetic. some companies market 4-stroke fuel as all synthetic as well. properly tuned, you should not have a problem running heli fuel in an airplane. Keep in mind that heli fuels do not have castor in them so an ABC/ABN type engine or lapped iron piston/sleeve engine are not best served by an all synthetic fuel.

iflynething,
The 46ax is an ABN type engine, it would probably best be served with at least a little castor in the fuel. Going from 15% to 10% should not pose any tuning difficulties, but it will need some minor adjustments for optimum running.

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Cooper Fuels LLC

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