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Old 08-31-2010, 11:48 AM   #16
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18% oil is correct, email OS directly and ask like I did. OS tech help is fantastic. I now use Odonnell 20% RTR blend in my OS .18 and it runs spectacularly. Tuning is brainless, very easy. Try Odonnell in your OS engine.

As for temp; tune for performance first, then check temp if you want. If it's high, make sure air can get to the engine heat sink. Is it sticking up in the wind, or completely hidden under a plastic cover? It needs a breeze to get rid of heat.

Seriously, email OS, they will steer you right.
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Old 08-31-2010, 11:56 AM   #17
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Quote:
Originally Posted by Maximo View Post
18% oil is way too much...that would make it want to run very hot and tuning very difficult...
I thought that with more oil the engine will run cooler because the smoke of the exhaust,which is the fuel's oil, takes out the heat from the engine. Is it wrong?


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Originally Posted by makaluch View Post
Are you using a car fuel or an aviation fuel?
makaluch, good question.
I am using an aviation fuel for which company that produces it says that it is suitable for helicopters and airplanes, model cars and buggy's. So accordingly to the company it is a general usage fuel. From personal experience and a lot of conversations with local experts pilots, this fuel is a really good choice(if not the best) for 30 to 50 size helicopters.

Before i buy this fuel i had a contact with the company and asked them to tell me if it is suitable for the particular car engine that i am using. They told me that the car will smoke more and that it will not produce max power but it should be fine.
Because i am not taking part in competitions yet and i don't care if i cannot take 100% of engine's power, i need an economical fuel for everyday use to run in the track for practice. So i decided to buy this fuel.

I cannot understand why a fuel that meets the requirements of the engine's manual(nitro 10%-30%, oil 5%-18%) will not run properly
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Old 08-31-2010, 12:08 PM   #18
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Originally Posted by MattFL View Post
Seriously, email OS, they will steer you right.
The engine is Thunder Tiger PRO-18BX, not an OS.
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Old 08-31-2010, 12:14 PM   #19
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Quote:
Originally Posted by rctech_new View Post
I thought that with more oil the engine will run cooler because the smoke of the exhaust,which is the fuel's oil, takes out the heat from the engine. Is it wrong?




makaluch, good question.
I am using an aviation fuel for which company that produces it says that it is suitable for helicopters and airplanes, model cars and buggy's. So accordingly to the company it is a general usage fuel. From personal experience and a lot of conversations with local experts pilots, this fuel is a really good choice(if not the best) for 30 to 50 size helicopters.

Before i buy this fuel i had a contact with the company and asked them to tell me if it is suitable for the particular car engine that i am using. They told me that the car will smoke more and that it will not produce max power but it should be fine.
Because i am not taking part in competitions yet and i don't care if i cannot take 100% of engine's power, i need an economical fuel for everyday use to run in the track for practice. So i decided to buy this fuel.

I cannot understand why a fuel that meets the requirements of the engine's manual(nitro 10%-30%, oil 5%-18%) will not run properly



well i cant believe they recommend 18 % oil thats a pain in the rear end too to tune. i say 10% to 12% but thats usually in race blead fuels like i use
but its easyier, to tune the engine because you dont have lean the engine as much.
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Old 08-31-2010, 12:20 PM   #20
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Originally Posted by tc5 man View Post
but its easyier, to tune the engine because you dont have lean the engine as much.
Yes you are right, but with such a rich mix why the temperature gets over 135C/275F?
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Old 08-31-2010, 12:32 PM   #21
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Originally Posted by rctech_new View Post
Yes you are right, but with such a rich mix why the temperature gets over 135C/275F?

it should that, sounds like a leak too me also if your running the engine when its hot out you have to lean the main needle out no a whole lot.
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Old 08-31-2010, 01:05 PM   #22
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Here's some unnecessary info:

Helicopter and airplane engines are run very different than car engines. They generally set the throttle to 50-80% and it only changes when they hit a particular pitch by using throttle curves (attached to collective on helis). The fuel is designed to accommodate that type of use. There is no need for a crisp low-end throttle response and there is very little chance of "loading up". The low nitro and heavy oils are there to protect an engine running full-time at high rpms. I can explain further but it's really unnecessary...

Just get a quality 20/25/30% nitro that's made for cars and don't look back. Seriously.
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Old 08-31-2010, 03:39 PM   #23
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Ok, tomorrow i will buy a new fuel for car(20% nitro and 12% oil) and i will keep you informed about the temperature issue.
In the meanwhile i will contact with the fuel company and inform them about the engine overheat problem that i have faced after i have followed their advice.

Thanks a lot for your answers.

Last edited by rctech_new; 08-31-2010 at 04:43 PM.
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Old 08-31-2010, 04:53 PM   #24
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I see your engine is not an OS, I apologize I thought it was since you were using an OS glow plug. Just for clarification on the 18% oil issue, here is the response that I received from OS about which fuel to use in an OS Motor, I'm sure other motors would be similar. Obviously less oil works fine, plenty of fuels have less than 18%, but the point is a fuel with 18% oil does run just fine in a car. I use Odonnells myself and it runs fantastic.

Quote:
From: Engine Support
Sent: Monday, July 12, 2010 10:34 AM
To: <edit>
Subject: Re: Fuel question, O.S. CV-R .18 engine


Matt,

Thank you for your recent email. We do not recommend using Traxxas
fuel in OS engines because it has a low oil content and can damage the
engine. We recommend using either O'Donnell fuels or other fuels with
at least 18% oil content.


<...edit out canned useful links and phone numbers...>

Sincerely,
Chris S.
Product Support Technician
PS9015
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Old 08-31-2010, 04:59 PM   #25
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Quote:
Originally Posted by rctech_new View Post
Ok, tomorrow i will buy a new fuel for car(20% nitro and 12% oil) and i will keep you informed about the temperature issue.
In the meanwhile i will contact with the fuel company and inform them about the engine overheat problem that i have faced after i have followed their advice.

Thanks a lot for your answers.

get ethier 20% ebmods fuel or byrons 20% , byrons does have 12% get the race blead . i use ebmods 20% race blead it has about 10% oil so it does make the engine run higher but not real bad.

im sure your lhs has byrons fuel im not sure about ebmods fuel.

Last edited by tc5 man; 08-31-2010 at 05:11 PM.
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