RE: OK fuel guru's....here is a tuff one
[quote]ORIGINAL: JCINTEXAS Pour 12 ounces of nitro into 88 ounces of your original fuel = 100 ounces of new mix at 25% nitro and 22% oil [/quote] I think that will only get the nitro to about 21%, not 25%. To get to 25% nitro, pour 16.7 oz nitro into 83.3 oz of the original fuel. The resulting 100 oz of fuel will have 25% nitro and about 21% oil. Or, just pour 25.6 oz of nitro into a gallon of the original fuel to get the same result. (I think JC used 15% nitro in the original fuel in his calculation, not 10%)
Posted on: 6/25/2012 11:49 AM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=11131226

RE: Braided Plug wire suppression sheath
http://www.aircraftspruce.com/catalog/elpages/shieldbraid.php
Posted on: 8/11/2011 5:24 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10666467

RE: Cool Power Fuel
Our club bought CoolPower by the barrel for many years. I always added 5oz of castor or Klotz BeNol to a gallon of the fuel which raised the oil percentage to about 20%. Many didn't add additional oil and didn't seem to have any problems, but I liked that little bit of extra protection.
Posted on: 4/10/2011 9:30 AM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=10454311

RE: FUEL QUESTION PLEASE
Turqui: Here's the most important thing you need to know about mixing your own fuel: Listen to Downunder, ignore moe7404.
Posted on: 2/25/2011 1:02 PM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=10363308

RE: New Giant GP Super Sportster!!!!!
The manual says to balance it at 5.25", and then, if you want, move it up to 1" forward for more stability and smoothness or up to 1" aft for more aeroabatic performance.
Posted on: 2/25/2011 12:54 PM by Author "hauckf" in the forum "ARF or RTF"
http://www.rcuniverse.com/forum/fb.asp?m=10363293

RE: Ethanol Or Methanol? best for Mix? reasons why or why not?
Hey Moe: I'm curious. What type of fuel are you mixing that requires the use of a hydrometer? A specialty fuel for R/C contest use perhaps? I agree with Downunder and Sport Pilot; to mix your own fuel for general R/C sport use all you need is a measuring cup (or 1 liter graduated cylinder) to measure the methanol, nitro, and oil. As a great fuel mixer once said, its "dead simple". The percentages of oil and nitro in virtually all commercial R/C glow fuels are by [u]volume[/u], not weght. The one exception may be Byrons fuel.
Posted on: 1/31/2011 9:11 AM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=10302335

RE: Ethanol Or Methanol? best for Mix? reasons why or why not?
Yes, the formulas are correct. Just multiply the percentage as a decimal (20% = .20) times 128 to get the ounces. Example: 128 X .20 = 25.6. I'll bet that there are websites out there with home brew calculators. I don't have a link, but maybe another someone else can post one.
Posted on: 1/21/2011 9:32 AM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=10278222

RE: BYRON fuels question
Whoops, my mistake. I should have said that Jeffie's latest post on 1/5/11 and Downunder's post are both correct. I agree with downunder. There is no need to add additional nitro when adding additional oil to a jug of fuel. Like downunder explained, its the methanol (and nitro) that burn to produce the power, not the oil. If you are adding the nitro because you think Byron's component percentages are calculated [u]by weight [/u]and not [u]by volume[/u] like just about every manufacturer's, then that's a whole different can of worms. The Byron fuel "percent by weight" issue has been beaten to death in this forum in the past. The one that I remember was about eight years ago, and I still have bruises from the beatings! [:)]
Posted on: 1/5/2011 12:01 PM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=10241448

RE: BYRON fuels question
Which is correct? They are both correct. Jefie states, correctly, that adding more oil to a jug of fuel will lower the percentages of the other components in the final mix, and explains why in his post. Downunder states, also correctly, that the final mix will produce the same power as it did before the extra oil was added, and explains why in his post.
Posted on: 1/5/2011 7:39 AM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=10241052

RE: Question on threadlock
For what its worth, the JB Weld website states that JB Weld "(Part # 8265-S, 8265, and 8280) can withstand a constant temperature of 500 degrees F. The maximum temperature threshold is approximately 600 degrees F for a short term (10 minutes)."
Posted on: 10/15/2010 3:16 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=10070696

RE: Hayes black seamless neoprene and ethanol blended gas
What about Viton tubing? Has that fallen out of favor too?
Posted on: 7/10/2010 4:50 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=9856372

RE: Engine effects of bad oil?
A few years ago a wise poster here on RCU summed up the oil debate quite eloquently when he said something like this: "All the major brands of 2-cycle oil when mixed according to the manufacturer's recommendations work equally well, but the one I use is the best!"
Posted on: 4/15/2010 3:32 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=9663112

RE: Material for filling aluminum gouge
I have never used it on an engine, but the J-B Weld website claims that the stuff will stick to just about any metal and can handle 500F, gasoline, oil, etc.
Posted on: 10/27/2009 9:54 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=9207793

RE: throttle push rod set up
If there is no metal-to-metal contact, there probabaly won't be any RF interference problems. I still like ball links on the throttle arm because addition to having not metal-to-metal, they can stand a little misalignment and seem to me to stay slop free longer. Just my preference, the clevis would probably work just fine as well.
Posted on: 7/17/2009 9:29 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8942403

RE: throttle push rod set up
If the throttle arm on the carb is metal, do not use a metal clevis. Metal-to-metal contact could cause radio interference. I would suggest a ball link on the throttle arm. As for the push rod, what you have would probably work OK.
Posted on: 7/17/2009 8:53 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8942328

RE: Correct gas/oil mixture for a Brisson 4.2
ww2birds: I might be wrong, but I believe that a ratio like 40:1 indicates 40 parts gasoline to one part oil, so that dividing the amount of gas by the ratio does in fact give the exact amount of oil to add to achieve that ratio. The other calculation in your post applies if the oil content is expressed as a percentage, as is usually the case in glow fuel.
Posted on: 6/30/2009 2:24 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8894950

RE: 2% more castor
After you send the engine to Downunder you won't need that test stand, so you might as well send that to me.
Posted on: 4/20/2009 12:44 PM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=8698685

RE: 2% more castor
To go from 18% to 20% oil, add [u]3.2 oz [/u]of oil to a gallon of fuel.
Posted on: 4/17/2009 3:33 PM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=8690433

RE: *Due For An Oil Change*
Pennzoil 2-Cycle Oil for Air Cooled Engines is available on line. The two sources that I know of, and I am sure there are others, are Aircraft Spruce, [link]http://www.aircraftspruce.com[/link] and Wicks Aircraft, [link]http://www.wicksaircraft.com[/link]. It's the oil I use, and the last time I bought it, I got it from Spruce.
Posted on: 3/28/2009 6:25 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8626505

RE: Lateral Balance...
If you want to go with JAP's idea and don't have lead shot, steel rod is almost as heavy. Just drill the hole a glue in a piece of music wire. As an example, 3/16" music wire weighs 1/8 oz per inch of length.
Posted on: 2/22/2009 2:09 PM by Author "hauckf" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=8505487

RE: Pennzoil Users Only
40:1 after break in cuz that's what the engine manufacturer recommended.
Posted on: 1/30/2009 3:48 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8420090

RE: Filter For Vent Line
In my opinion, vent line filters are not necessary. Your vent tube is probably well over a foot long with oil residue on its inside surface from the oil in the fuel. (You are looping the vent tube over the top of the tank, right?) The air flows through that tube very slowly, so the chances of anything making it all the way through that long tube with all its twists and turns without touching the sides and sticking are about zero. If anything does get in there and stick, you'll flush it out the next time you fill your tank. Of course a filter probably can't hurt either, so if it makes you feel better, go ahead and put one on.
Posted on: 1/20/2009 8:21 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8381680

RE: craftsman 2.0
To convert cubic inches to cc's, multiply the cubic inches by 16.4. Two cubic inches is about 33 cc's.
Posted on: 10/20/2008 12:03 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8066436

RE: DL50/G62 oil mix
If you don't need a case of the Pennzoil, and can't find single bottles locally, you can buy single 8 oz bottles from Wicks Aircraft ([link]http://www.wicksaircraft.com[/link]) for about 2 bucks a bottle plus shipping. (At a 40:1 mix, a single 8 oz bottle is enough oil for 2.5 gallons of fuel. A 24 bottle case of 8 oz. bottles mixed at 40:1 would be enough for 60 gallons of fuel.)
Posted on: 10/17/2008 8:04 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=8058792

RE: Fuel tank/clunk set up question
[quote]ORIGINAL: krayzc-RCU i asked gas or glow as a gas engine never does ingest an air bubble because of the way the carb is set up. [/quote] I am not doubting krayzc-RCU's statement, but can anyone explain why a gas engine does not ingest an air bubble, or point me to a thread, etc.? I've read a ton of threads on RCU and info on other sites on Walbro carbs and have never read an explanation, or for that matter, any mention of that fact. Thanks.
Posted on: 7/24/2008 8:13 PM by Author "hauckf" in the forum "Giant Scale Aircraft - 3D & Aerobatic"
http://www.rcuniverse.com/forum/fb.asp?m=7768808

RE: Engine Quits in Flight
Its a long shot, but could it be a clunk problem?
Posted on: 7/7/2008 1:42 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7703220

Fuji 32EI RPM range
Hey Bax! What is a good RPM range for a 32EI? Mine turns an APC 18-8W at 7200 RPM, which is 300 RPM rich of max. Is the 18-8W too much prop? The reason I ask is that the engine runs a little hot, about 280F, in my GP Giant SuperSportster. I'm running regular gas with Pennzoil @ 40:1. Thanks.
Posted on: 7/4/2008 4:05 PM by Author "hauckf" in the forum "Fuji-Imvac Engines Support"
http://www.rcuniverse.com/forum/fb.asp?m=7694223

RE: Where to get 4 -Stroke Fuel and Fuel Mixing question?
With the link from Prairie Mike you don't need the math, but since you asked, here it is. To calculate the amount of oil to add to a gallon of glow fuel to raise the oil percentage to a higher level: Fluid Ounces of oil to add = [(D% - S%) X 128] / (100 - D%) where D% is the desired oil percentage, and S% is the starting oil percentage. In your example, to go from 17% to 18% multiply 1 times 128 and divide that by 82. The answer is 1.56 fl. oz. Here's another example: To raise the percentage from 17 to 20%, multiply 3 times 128, and divide by 80. The answer is 4.8 fl. oz. If you are aiming for a final oil percentage of 18 - 22%, a good rule of thumb is to add 1.6 fl oz of oil for each percent you want to increase. This rule of thumb is not perfectly exact, but it is so close that your engine will never know the difference. Remember, both the formula and the rule of thumb assume that you are starting with a gallon (128 fl oz) of fuel.
Posted on: 6/25/2008 2:50 PM by Author "hauckf" in the forum "RC Fuels"
http://www.rcuniverse.com/forum/fb.asp?m=7659948

RE: OIL GAS RATIO
If you don't have the charts or computer handy at the time, it is a simple calculation. To calculate the number of ounces of oil to add to a gallon of gas for any ratio, just divide 128 oz by the ratio number. Example, for a 40:1 ratio, divide 128 oz by 40. (128oz/40=3.2oz) Conversely, to get the ratio for a given amount of added oil, divide 128 by the number of ounces. 128oz/3.2oz = 40.
Posted on: 6/10/2008 1:29 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7603277

RE: Spinner problems
I don't know if this will help with your problem, but I used a Tru-Turn spinner adaptor #TT-0835-A on my 32EI. It utilizes a bushing instead of a shoulder on the screw. I got mine from Tower, item #TRUQ4035, $9.99 + $3.99 shipping. It requires a #10-32 spinner screw instead of the one supplied with the engine, but you can pick that up at your local hardware store. It works fine with an APC prop with a hub about 9/16" thick.
Posted on: 4/2/2008 1:57 PM by Author "hauckf" in the forum "Gas Engines"
http://www.rcuniverse.com/forum/fb.asp?m=7322100