RE: types of fuels claims on o%nitro??

RE: types of fuels claims on o%nitro??
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RE: types of fuels claims on o%nitro?? - 1/1/2006 11:37:46 PM

suzonka

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Joined: 11/22/2004
From: calverton Long Island, NY, USA
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quote:

ORIGINAL: estradajae

and my engines start instantly without nitro...

If the compresion is there its OK

(in reply to estradajae)

Post #: 26

RE: types of fuels claims on o%nitro?? - 1/4/2006 10:16:34 AM

pe reivers

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Joined: 1/23/2002
From: Arcen, , NETHERLANDS
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Recently, MVVS quickies were adapted to the US nitro craze.
Result:
They now run much shy of their potential when used in FAI events, where no nitro is allowed, unless the compression ratio is raised again.
Generalities:
A good engine does not need nitro, if the compression ratio is adjusted accordingly. There is ample proof of that in FAI racing.
In a less than good engine, bad design can be blanketed by nitro, sometimes lots of it is needed.
In two strokes, nitro helps to make carb setup uncritical, due to the wider combustion limits of nitro.
In four strokes, nitro helps a lot to get the engine ironed out over the whole rpm range.
More power can be had from a good engine at nitro over 20%, if the CR is adapted wisely.
(grammar edit)

< Message edited by preivers -- 1/4/2006 1:43:42 PM >

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(in reply to suzonka)

Post #: 27

RE: types of fuels claims on o%nitro?? - 1/4/2006 12:06:54 PM

suzonka

Posts: 601
Joined: 11/22/2004
From: calverton Long Island, NY, USA
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quote:

ORIGINAL: preivers

Recently, MVVS quickies were adapted to the US nitro craze.
Result:
They now run much shy of their potential when used in FAI events, where no nitro is allowed, unless the compression ratio is raised again.
Generalities:
A good engine does not need nitro, if the compression ratio is adjusted accordingly. There is ample proof of that in FAI racing.
In a less good engine, bad design can blanketed by nitro, sometimes lots of it are needed.
In two strokes, nitro helps to make carb setup uncritical, due to the wider combustion limits of nitro.
In four strokes, nitro helps a lot to get the engine ironed out over the whole rpm range.
More power can be had from a good engine at nitro over 20%, if the CR is adapted wisely.

===============================================================Thanks for your information ,you really did your foot work and gave the most logical explanation above

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(in reply to pe reivers)

Post #: 28

RE: types of fuels claims on o%nitro?? - 3/19/2006 7:13:17 AM

loughbd

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Joined: 11/29/2003
From: Bremerton, WA, USA
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quote:

ORIGINAL: suzonka

thanks again , so OS engines need some nitro

Actually most OS engines will run fine on FAI fuel. The four cycles like it for the idle. OS engines are used in many FAI contests and the only fuel allowed in FAI events is 0% nitro.

(in reply to suzonka)

Post #: 29

RE: types of fuels claims on o%nitro?? - 3/19/2006 8:16:51 AM

asmund

Posts: 1767
Joined: 11/20/2005
From: Floroe, NORWAY
Status: online

my os 91 fx runs 11000 on the apc 13-8 on 15% nitro and 10800 on the same prop on 0% nitro. Easy starting and trottles fine no matter what.

(in reply to estradajae)

Post #: 30

RE: types of fuels claims on o%nitro?? - 3/19/2006 8:56:54 AM

suzonka

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From: calverton Long Island, NY, USA
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quote:

ORIGINAL: asmund

my os 91 fx runs 11000 on the apc 13-8 on 15% nitro and 10800 on the same prop on 0% nitro. Easy starting and trottles fine no matter what.

VERY GOOD ONLY 200 rpm DIFFERENCE

(in reply to asmund)

Post #: 31

RE: types of fuels claims on o%nitro?? - 3/28/2006 1:01:45 AM

speedster 1919

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Joined: 12/17/2004
From: Martinsville, IN, USA
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suzonka Nitro is a USA product made nowhere else in the world. It is cheap here for us in the USA ,so we are pigs about it. Where as castor oil is a little harder to get in the USA when it is made world wide. Most foreign flyers pay dearly for 5% or 10% nitro. You can buy 0% nitro and oil content is 100% synthetic but this is not true FAI fuel because some countries don't have good synthetic oil sources , but they have castor. So a world competition has to use true FAI fuel. The standard is 80% methanol and 20% castor oil. BTW methanol is made world wide also.

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Post #: 32

RE: types of fuels claims on o%nitro?? - 3/28/2006 1:54:17 AM

loughbd

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From: Bremerton, WA, USA
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Don't know where you get your info but castor oil is easy to obtain in the US. Just walk into most good hobby shops and buy a quart of Sig bakers AA castor. Or mail order it from Sheldon's, Tower or any other mail order hous. FAI fuel does not have to be castor oil. The only stipulation is that it is 80/20 methanol and lubricant. I have been flying FAI events for years. I use 80/20 but the oil is 1/2 castor/synthetic

I buy Sig castor eveytime I make up a gallon of fuel for my Tartans. They use staight methanol and 8% oil.

We're pigs because we use nitro??? Speak for yourself. There are lots of things that you can only get in this country and just because we use them doesn't make us pigs. One of the benefits of living here.

(in reply to speedster 1919)

Post #: 33

RE: types of fuels claims on o%nitro?? - 3/28/2006 9:46:38 PM

Hobbsy

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From: Colonial Beach, VA, USA
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Speeds is speaking figuratively not literally, but he's right though, we are pigs about it, there are very few engines that won't run fine on 5% or less nitro but we read every day about guys running 20, 25, or even 30% in their engines.
I have a Tartan 1.34 converted to Diesel, no numbers yet though.

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Post #: 34

RE: types of fuels claims on o%nitro?? - 3/29/2006 1:59:35 AM

Flyboy Dave

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From: San Bernardino County, CA, USA
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Get the best castor in any motorcycle shop. If they don't have it, they
can get it the next time the "oil man" comes around.

FBD.

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A mechanic says..."Oh yeah, watch this".
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Post #: 35

RE: types of fuels claims on o%nitro?? - 3/29/2006 2:53:38 AM

RaceCity

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From: NotUpNorth, USA
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Gee Dave...the race shops here seem to think folks are made of money. Benol? $9.00/PINT!!!!!

I get the nextest besterer bean oil (Bakers AA) for $7.99/qt at the LHS. Even cheaper by the gallon.

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Post #: 36

RE: types of fuels claims on o%nitro?? - 3/29/2006 4:20:56 AM

Flyboy Dave

Posts: 13175
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From: San Bernardino County, CA, USA
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I hear ya' Race....the oil merchants are taking us to the cleaners. I've been
using Maxima 927....but it's like 10 bucks a quart.

(and higher)

Back in the old days Castrol_R40 was like $2.50 a QT.

Lemme check on the Castrol.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

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Post #: 37

RE: types of fuels claims on o%nitro?? - 3/29/2006 4:37:13 AM

Flyboy Dave

Posts: 13175
Joined: 3/20/2002
From: San Bernardino County, CA, USA
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Now I remember why I run Power Master 15% Sport fuel....

....it is 18% oil, with 1/3 of the content being of the beloved castor.

For the castor lovers....there is nothing better.

FBD.

_____________________________

An engineer says.... "That won''t work".
A mechanic says..."Oh yeah, watch this".
"Old Age, and Treachery will overcome youth and skill".
Revver Bro #4.

(in reply to Flyboy Dave)

Post #: 38

RE: types of fuels claims on o%nitro?? - 3/29/2006 5:21:37 AM

loughbd

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From: Bremerton, WA, USA
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There is no way a high compression low nitro engine can compete with a speed engine running with a high nitro content. Nitromethane contains Oxygen and is an oxidizer which generates heat and heat is power. That's WHY we use it. This has been proven over and over again in control line speed events and other events where all out speed is required. You will notice that FAI speed records are nowhere near AMA speed records for the same events. AMA events allow nitromethane and FAI do not. If a high compression engine running on Zero nitro would compete with a low compression high nitro engine we would use it. Why waste money and wear out expensive engines if you don't have too?? Because that's how you get POWER. The only reason the FAI (read that Europe) uses FAI fuel is that it is too expensive for the average modeler and it is easy to make sure everyone is handicapped by using the same fuel. I ran boats for years and the standard was about 40%. There was a noticable difference in power. I ended up using 15% because I figured I could make up for the lack of speed with driving skill. I could never beat the guys that were using hi nitro and were also GREAT drivers.

Race car drivers use the stuff too and there is no FAI restriction in the auto world

(in reply to pe reivers)

Post #: 39

RE: types of fuels claims on o%nitro?? - 3/29/2006 2:23:01 PM