Motorized Bicycle E85 Build Running strong now! Lots stuff I learned now!

One of the best research videos, I've ever watched. The tech made the video. Great research, sadly eventually we all will probably be running on E85.

The math with my speed formula:

MPH=(RPM × Wheel Diameter × ⚻)÷(1056 × Total Reduction)

(7180 × 26 × ⚻)÷(1056 ×(4 × (40÷10)))= 34.7 mph.

So no B.S. on your speed; it's legit.

I myself have been trying to get my own bike running e85. I've found much resistance from others, mainly folks who have never touched an e85 pump in their lives. However, there isn't any hard evidence that e85 is actually "bad". In fact, most issues arose from older vehicles that had issues, like 60s and 70s cars, so those rumors have stuck around. The reality is that ethanol is no more corrosive than gasoline, also, race teams use ethanol because it's the better fuel. Liquid oxygen. Ethanol has 30% oxygen, gas is closer to 10%. Oxygen in liquid form. This is why more fuel is needed, theres more oxygen available to burn. I found Amsoil synthetics DO mix well with e85. I had been trying to get the NT carburetor to flow it but the throttle response is different, it seems a bit laggy. Though I'm still trying to get it dialed in just right, my fastest speeds are gotten running ethanol. You are correct about running cooler, at times I can let my entire palm on the head and it's just warm, not hot. The engine also gets more oil, because if the fuel itself is mixed at the same 100:1 ratio of oil, and your putting more fuel in with e85 vs gas, then your getting more oil per cycle due to the larger volume of fuel being used.
I read that you were using a fairly large jet. What size jet do you think would work in the NT? I've tested up to I want to say it's about a #90 jet but still seems lean, runs normal with a #72 on pump e10, a #58 on ethanol free pump gas.

I'm really happy to see that others are taking the leap to e85. Look into it and you find that most race teams use it. Theres absolutely nothing wrong with e85. It's the better fuel. 30% oxygen vs gas's maybe 15% at the most in oxygenated gas. Oxygen in liquid form is much denser. Like I said, my fastest speeds have always been with ethanol.

No one who told me e85 was "bad" was able to Present actual evidence, picture, video, anything. Talk is cheap. Theres a reason it's used at the track. It's certainly not because it sucks.

Didn't think to try a hotter plug, but it makes sense. Will be getting one when stores open back up.

Racers don't use alcohol because it's a better fuel... They use it mainly because it's a safer fuel (& it's also mandated by many racing organizations for safety reasons).
Other reasons it's used are because it has a higher octane rating, it runs cooler & it's a lot cheaper than gasoline.

The fact is, gasoline is a way more powerful fuel... (Alcohol has about 1/3 less explosive power than gasoline).

Yes, all great points!!!!

BTW "better" is a subjective word. They use it because it's better. Yes. You just pointed out reasons why its "better" . I never said alcohol was "more powerful" than gas. That would be incorrect.

My point is this... Between the two, gasoline is the superior fuel if you want to go fast!
If there was a race where all the cars used alcohol, & only one used gasoline... The gas car will win every time.

It's true, alcohol is better for racing because it's safer & cheaper... but it doesn't win races.

The only real benefit to alcohol is that it runs cooler, (& you can run more advanced timing)... But the opposite point is that a gasoline engine will still have more power (even with the retarded timing).

So, there you have it.... What's actually 'better'? To be safe & save money, or to win the race??

Research affects of E85 on 2 stroke engines

wrench said:

Research affects of E85 on 2 stroke engines

Click to expand...

Thank you!!! This falls under the 'you learn something new every day' category!

Interferes with proper oil lubrication and it eats the crank seals
E85 is a death sentence for a CG engine

Is this the same bike that you said goes 79 mph?

TheEvilCareBear said:

Ha! Yes and no not 79mph lol 74 yeah. You gotta read the description though on that video to get how that happened! That 1.23 minute clip took almost 3 miles and it had to be towed by a car to start and hit 40mph and the carb retuned after it started to get to that point on a 22t sprocket. From that point next 2 miles climb to 65mph for the few second clip you see lol. Not even possible unless you get towed up to speed to match engine rpms. Math is on that video to to back it up as well. Other thing is that plug was so hot it was near run away status after video stopped to pull that off. Took almost 1.5 miles of half throttle to get it back to 8k range to be able to kill it. Pulling plug wire probably wouldn't of mattered at that point.

Click to expand...

So now the picture is a little more clear. Similar to this.


As for the E85 and methane testing I commend you for it. When I built the LandRider which shifted gears automatically I was told by the experts it'd never work; yet I rode the bike for 10 years.

Tried lots of tweaks with it though. Here's an old video when it was a 1×5; latter went to a 1x7.


I tell you this story because experienced builders gave me all the logical reasons why it wouldn't work. However, none of the experts had any experience with the auto shifting derailleur. The funny thing is I had been riding the bike a year before I started going on the forums. The fact I was riding the bike was being overlooked. It was a long time before they too accepted the fact I had truly built a bike that shifted gears automatically.

There's a belief that E85 and methane mixed fuel will destroy these engines. So I thank you for being brave enough to risk an engine to do research. What I'd like to see is the engine tore down and inspected every 90 days or so. Then definite proof will be available as to whether it harms engines or not. Also if you must upgrade certain parts report that as well.

There's only one place in my little population town of 5000 that sells a 100% gas. All the other places sell E90. The way the world is heading mixed fuels with alcohol and methane are going to become more common and in even higher amounts before we're forced to go electric.

All I ask is that you be objective and accurate in reporting your discoveries. If problems are occurring then we all should come up with affordable ways to fix them.