100:1 Mix

in the last coupla years, i've ridden my bike plenty of times in 100+ weather. even ran a brand new engine from costa mesa to seal beach and back (about 75 miles round trip) at full throttle and about 90 degrees.

i figure the faster i go, the cooler the engine. gets more air-cooling, right? ;)

honestly, i've never had a bike run poorly in the heat. it usually handles it better than i do.

another side of the coin is running regular oil and a rich mixture on a hot day. it seems to me it would have a slower cooling rate due to the "thickness" of the mix, as it would be circulating at a slower rate, not to mention the "molasses" effect as the heat burnt it up.

not exactly scientific, but it sounds plausible to me.
 
i just made that up. it's definition is: thick oil mixture heating up and leaving brown gunk all over your engine, impeding flow...
 
talk about doom and gloom people. i have not found any negative info on opti2, here or on the web. nothing but praise. but in here just a lot of ,o it might or it could have but or it probity will some day.

i think these people have stock in BIG OIL! lol or co2 credits. and need to have BLUE smoke cumming from there exhaust pipe or pie hole? lol
 
We've had temps of over 100 degrees here in central Texas for 45+ days now, many days of 104-105 in the shade and over 120 degrees out in the sun, my bikes run great..no issues period and all are on Opti2, air is very dry and very HOT....we are in the worst drought in recorded history in Texas right now and I ride in very dusty dirty conditions as well, I live in the country and ride mainly on dusty dirt roads, Opti2 has worked great for me thus far..... I love the stuff, no smoke, runs clean, my engine make better power and torque on it.....what on earth could be wrong with all that.....?

Peace
 
I have heard said on here that these China Girls are not all the same. Maybe some can take the heat better than others. Could be.

Terry
 
Fulltimer said:
I have heard said on here that these China Girls are not all the same. Maybe some can take the heat better than others. Could be.

Terry
Click to expand...

this is a prime exampled of what i am talking about. ]I have heard said
on here that these China Girls are not all the same.

MAYBE some can take the heat better than others

never first hand facts just my friend's, aunt's, cousin's, grandpa's, sister's, uncle's ,friend's, boss's son's girlfriend,s, friend said that they had a problem!

as Dragnet's Joe Friday would say. "just the facts ma'am just the facts"

if you do not have first hand knowledge. keep your urban legend and here say to your self.
 
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Don P: I understand what your saying but when you miss quoted me it looks like I said something that I didn't.

Good old Joe Friday, what memories! And, that does point to a good example. Only facts should be repeated. I stand corrected. :-)

Terry
 
Terry
i included your full post. it stand for it's self.
i spaced them out for you. sorry did not intend to make it look like you were saying something you did not.
i did not try to miss quoted you or manipulate it in any way.

you jest happen to post as i was having a fit over the people that DO NOT use opti 2 pooping the one that do with no facts. just your lucky day.

sorry again nothing personnel.

Don P

opti 2 is like eating lay's potato chip you can't eat just one. once you use it you can't go back.
 
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No problem Don. I understood what you were doing. I just didn't want anyone not reading the thread to think I said something I didn't. All is good on this end.

Terry
 
Any one want to buy my piston and cylinder that I had to replace from using Opti-2 according to instructions? Send me a message. I will use the rest of the Opti-2 that I bought up at the recommended mix of 40:1 and then buy no more. Fool me once, shame on you. Fool me twice, shame on me.
 
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I won't make you go back somewhere around page 64 of this thread, but yes, I contacted Brad about it and he dropped me like a hot potato. It seems that if you have problems with Opti-2, you are on your own, as it says on interlube's website. Fortunately, the Opti-2 fiasco only put me back about $30, and I did not follow Dax's instructions as to fuel to oil ratio. My bad.
 
I will use a few tankfuls of fuel mixed with Opti-2 at Dax's recommended ratio of 40:1 so that I will still get what I bought the Opti-2 for in the first place - eutectics. Once the rings and cylinder wall are conditioned by the Opti-2, I will move on to a cheaper oil. I have found out on Auto-Rx Internal Engine Cleaner that American oil suppliers are allowed to fudge on stating that their oil is "synthetic". (Auto-RX is a really cool product that I plan to use soon on my 1999 Nissan Quest that has 285,000 miles on it and has just started to lose gas mileage and horsepower, does not work on two strokes, though). So on these little engines a break-in with the "eutectic advantage" would be more useful than using dubious synthetic or Opti-2 at the risky ratio of 100:1/72:1.
 
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Humm i broke my 2 stroke ht in at 70:1 opti 2 not a problem. this was a new engine and i made sure that i had gas WITH NO Alcohol in it. Alcohol in your fuel is a death to a 2 stroke engine.
 
I agree that alcohol is no good. You can go to pure-gas.org to find a station in your area that has 100% gas.
 
The answer to the question as to why some two stroke engines seem to thrive on Opti-2 at 72:1 or 100:1 and why other engines overheat and seize on it as mine did seems to lie in two things: displacement to horsepower ratio and how the engineers took that into account when designing the engine's heat dissipating characteristics. China girl engines have two displacements and horsepower ratings and if I remember correctly the 48 cc engine has a 1.75 rating and the 66 cc has a 2.75 rating. So they would have a 27.4 and 24 ratio, respectively. My CAG engine that seized up was 47 cc with a 4.2 horsepower rating, a ratio of about 11.2 to one. A 47 cc engine that puts out 4.2 horsepower will produce more heat than the same size engine that puts out 1.75 hp. One of the factors that engineers look at is how much heat must be dissipated to keep the engine from overheating, and they take two factors into account with an air cooled engine: the surface area of the cooling fins and the cooling effect provided by the oil in the fuel as it passes through the engine. A higher horsepower engine, such as the CAG I have (which can produce up to 10 hp out of 47 cc), has a lot more heat to dissipate than the weaker china girl engines, and thus is more sensitive to the fuel to oil ratio and fin surface area. In addition, if the engineers kept the fin surface area down to make the engine more compact, they would be relying more on the oil to carry that excess heat at a specified fuel to oil ratio of anywhere from 20:1 to 40:1. When you raise the fuel to oil ratio above that you are in danger of making the engine overheat and seize the piston, as happened to me. Bottom line: follow the engineers' recommendations regarding fuel to oil ratio and you cannot go wrong. If their design relies too much on the oil in the fuel to dissipate heat and you reduce the amount of oil in the fuel, you may just experience a locked up engine. You could only find out the design specifications about a particular two stroke engine by contacting the engineers that designed the engine and getting a reply from them, or by trial and error as I did. Can we have the input from any engineers on this?

1997 Associate in Applied Science - Automotive Technology, Cum Laude, Southern Illinois University
1997-2003 ASE Master Technician
 
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