Yeah, the problem with that idea literally, is that it takes about twice as much methanol to run an engine. So until the price of gas is more than double that of methanol, there would be no financial gain. Don't worry though, our government and their oil company chronies will get it there soon enough....

AV8TOR

Without reading all the pages of this thread....I think the porting has only been done on intake and exhaust ports. Do the transfer ports need any enlarging ect to get more RPM out of the port jobs? Also what cutters are you guys using? Can you lay some out on a table and photograph them? On the last treatment of a port...do you hand stone the edge to get rid of burs? Does the crome liner stay ok after runing? Thanks Capt,n

I just use various carbide cutters and stones in my Dremel. I've enlarged and raised the transfer ports on some of my engines and it does help. That's how I got 9400+ rpms on an APC 16 x 8 with my Homelite 30cc. If I remember correctly I used a "blowdown" of 22 degrees on that engine. When you work on transfer ports, it's important to maintain the original angle of the ports so you don't screw up the cylinder scavenging. So far no problems with chrome chipping "knock on wood." Just make sure you chamfer those port edges to help the ring(s) live a long and happy life.

AV8TOR

Capt’n, the blower engine was the first one I have cut in over 20 years and only the exhaust port was modified. The cylinder cut easily with a tile bit in the dremel tool. I finger sandpaper to break the port edges. I also made a pencil trace of the original port so the shape could be maintained. Target was 150* but calculations must have been off so I ended up with155* duration. As with other operations go slow. It is easy to take too much material off.

Suspect chrome is impregnated today rather than plated and it did not appear to be a problem.

Bill

Thanks guys. The engine I am working on now is a GT25 I got from Scott (poco242). It has no carb or exhaust. Took the intake off and the ports look fairly large. I do not know if he changes the timing or what. His engines do run real good when he gets them ready. It looks like the carb adapter has to be redone or replaced. I am kinda looking what may fit the bolt pattern. Maybe the carb off my G38 will work. Well time will tell. Got to go work on ny nephews cycle now. Capt,n

Capt’n I wrote [link=http://www.rcuniverse.com/forum/fb.asp?m=3355337]this[/link] 8 months ago. Do you read this thread over and over again?

Are you asking about the milege or being sorry?

About the fuel cost:

The gas was over 3 dollars a gallon and retail methanol $2.99 then. Now it is even worse with gas prices going up to $3.40 [:@]

In my post I was refering to racing guys who buy methanol in barrels - the price was around $1.49 per gallon then (I don't know if it went up now). Even with twice lower milage methanol beats the gass. However methanol is "hotter fuel" and it produces more energy with the proper air-to-fuel mixture (that is twice richer than gasoline mixture). Then the methanol milage caluclated as power per hour is maybe 1.5 times worse than gasoline (not two times).

About being sorry for flying DA 150:

I was kidding. I'm never sorry for a guy flying a model plane as long as he has fun. What to be sorry about? The big picture is, that this hobby is eating your bank account rergardless what you fly But I'm sure the joy and experience is worth every penny of it anyway.

Rysium: I did not notice the date on the post ..just clicked on and read it. I do think the big Da 150,s do not cost that much to run on pump gas. If you tried that size of engine on acohol ...it would burn far more being the fuel to air ratio is about 6-1 and gas is about 13-14 to 1 ratio. Even if the cost of acohol was less ....the fact is you need twice as mutch to make the same flight. OH.... The Sorry thing...never gave it a tought. Just kinda wondering about the mileage. I could be way off on my assumption....I never owned a DA 150. Too much$$$ for my type of fun. Playing with engines is my real fun...then flying. PS. Like they say " Your mileage may vary" Best Regards Capt,n

Don't forget about the power from the same engine displacement. 100cc engine running on methanol will give you probably the same power as 150cc running on gasoline. So the mileage is not exactly 2:1 but maybe something like 3:2.
Yes, at the pump methanol costs just a bit less then gasoline, so it is not cheapper running yet and I hope we will not go that way (I drive 75 a day just to get to work and my truck aint run on methanol).[:@]

Welcome to my world Capt,n

RysiuM: I had to drive about 27x2= 54 miles per day with lots of stops and corners. Not anymore...I am retired now. Not by choice. It seems like I was always stopping for gas. Now I wait till the price of gas goes down. It goes up and down like a Yo Yo here in West Michigan. How is the weater out there for flying in sunny California? Its been raining here a lot. Do you have a 4 cycle Robyi? They ssem like a interesting project. Take Care Capt,n

Finally we have summer over here. It means there is no bad day for flying.

I think I know what you mean. Flying back from to Sacramento from SD took me almost 20 hours because the weather messed up all ORD flights. What I saw over there SD is not a good place for flying RC either unless you like fly RC Kites. It's windy almost every day.

I dumped the idea of 4 cycle Ryobi as it it is to big in size (will not fit inside the cowl in my Wilga). I checked also Honda, and it is to tall too. However I found in Sears a weed whacker with 4 cycle B&S 40cc ([link=http://www.sears.com/sr/javasr/product.do?BV_UseBVCookie=Yes&vertical=LAWN&cat=Po wer+Lawn+Equipment&subcat=Line+Trimmers&pid=071796 16000]Craftsman 40cc Gas Line Trimmer, Sears item #07179616000 Mfr. model #79616[/link]). I can't find any info about this engine, and my questions in RCU were left without answer. For the size and weight it might be good engine for me, but I'm not going to spend over 200 bucks for this engine just to find out it is not it.

Find the model no and type it ih here. http://www3.sears.com/ Good luck Capt,n

Howdy.
I stopped by the local race shop.They still sell methanol @ 2.99/gal 5 gallons minimum.
I got some 15% fuel laying around so thats what i wanna try.Do you think it will work.....?
I'll mix 1/2 gal of 15% fuel (15%nitro+15%oil+70%methanol) with half gallon of methanol then mix in two gallons of 91 octane gasoline.
it should make 2.5%oil +2.5%nitro+28.3%methanol+66%gas

Math sounds right??

Mix sounds usable?or do i need more oil?or methanol or nitro?

Thanks. I will try. I've seen it at Orchard here. I will try to open the paperwork and see what numbers I can get out of it.

OHS has it for $229.99 but Sears run promotion again for 209.99. I bet OHS can meet the Seaars price. It is just tough spending over 200 bucks buying something we call in Poland "cat in a bag"

I believe what you want to do is make the 15 / 15 into 10 / 10 and then mix that 1 part 10 /10 to 2 parts gas.

Ralphbf: With the mix you just decribed....what will the percentages of each part be? How do you make 15/15 into 10/10? I must be tired...cannot figure it out. Time to hit the hay. Take Care Capt,n

I didn't take time to check your math, but those are the final percentages you want to end up with. At least they work very well for me in several engines. Just be sure to use a four stroke plug, and be prepared to do a bit of tuning on the carb until you get it all dialed in. Go for it! I haven't put an ignition system on my last three planes.

AV8TOR

You can turn 15/15 into 10/10 by adding methonal to the 15/15.

For instance take 9 ounces of 15/15 and add 3 ounces of methonal will make 12 ounces of 10/10.
Then add that 12 ounces to 24 ounces of gas and you will have 36 ounces of gas/glow fuel

Or take 3 quarts of 15/15 and add 1 quart of methanol and you will have 1 gallon of 10/10.

It's 2 am but I believe this is right, if not someone out there will catch a mistake.

Ralphbf: Sounds like a good way to mix fuel. Thanks again....Capt,n

Ralph, I disagree with your mix, it is close.. composition 66.7% gas 25.8% meth 3.75% oil 3.75%
The differencce is that you dilution with meth yeilds 11.25% oil and nitro not 10%. An example using 10oz adding 5oz would have been perfect yeilding 15 oz to added to 30 oz of gasoline for a 45 oz total.

I think this will give the desired mix. [i]"For instance take 9 ounces of 15/15 and add 5 ounces of methonal will make 14 ounces of 10/10. Then add that 14 ounces to 27 ounces of gas and you will have 41 ounces of gas/glow fuel with 65.8 % gas; 27.6% meth; 3.3% oil; 3.3% nitro. composition" [/i]
To Mix a gallon of this stuff : 28.1 oz glow, 15.6oz methonal, 84.3 oz gasoline.
If I had not tinkered with this some time ago and made a spreadsheet calculator format, I would not have bothered with the post. The percent of methonal difference is probably not that important.

More than most care to know.

Help me out. here are the basics

I run 1/3 glow at 10/10 and 2/3 gas

To make 15/15 into 10/10 I need to dilute it by 1/3.
15 is 33% larger than 10

Take 9 ounces of 15/15. 1/3 of 9 is 3.
So adding 3 ounces of methonal to the 9 ounces of 15/15 should give us 12 ounces of 10/10

Am I right so far?

9 oz of 15/15 containes 1.35 oz oil, 1.35 oz nitro and 6.3 oz MeOH. Adding 3 oz MeOH gives a total volume of 12 oz which contains 1.35 oz oil, 1.35 oz nitro and 9.3 oz MeOH.

then: 12 oz X y = 1.35 oz oil; y = 1.35/12 = .1125 or 11.25%

To find total volume for the 1.35 oz of oil or nitro to make 10/10:

0.1 x = 1.35, then x = 1.35/0.1 = 13.5 oz

Then 13.5 - 9 = 4.5 oz of methanol required

So 1/3 of 9 is not 3 ?

Yes, 1/3 of 9 is 3 or in other words, 33 1/3%( 1 divided by 3 = .33333) However, the 15/15 mix is a volume percentage. 15% + 15% = 30%. 30% of 9 oz is 2.7 oz. I hope that clarifies the math.

What ratio would the oil be when you mix 1 part 10/10 to 2 parts gasoline?

Component______ Quanity(oz)______ Percent_____Final Mix
Gas ___________ 30 ______________30/45 ________________ 66.6%
Meth ___________ 5 ______________________5/45
Oil 0
Glow Fuel 15-15__ 10 ______ % ______oz.
___ Meth Quan x Vol used_____.70 ____ 7 ____ 7/45
___ Oil ____________________.15 _____ 1.5 ________1.5/45 ______3.3%
___ Nitro ___________________.15 _____ 1.5 ________ 1.5/45 _____ 3.3%

__________________________________Tot Meth (5+7)/45 _________26.67%
Quan
Total
_________________ 45 (sum) ________________45 ______________ 100%

Hope this post properly more time to put on Word Pad than to input to a spreadsheet.
Quanities of individual components divided by the Combined Total all of the parts
Allows seeing ' What if I mixed various items what the end result would be. At over $50USD
per gallon for glow locally, I plan to Home Brew. Note the row for adding additional oil if needed.

Ralph: Oz of Oil in volume of glow used divided by Total Oz in the mix. (above example 1.5/45=30 1 part in 30 is oil)