torco mach 110 and tt111

[hot125mod]

Alright I sold my rm 125 and when I had it I ran the tt111 the person who bought it is using the torco. at 62 degrees the jets I used were 162 42 and the stock needle on the 3rd or middle pos. it seemed the torco needed to be 2 sizes on the main and pilot bigger at ther same temp. Same clip pos though I know a decent amount about fuel but am a little curious to why it is so much different in the jetting. my guess is the specific gravity or the dist. curve and why please inform me BTW it is a full tilt mod motor tempermental SOB so here is the spec sheet on the two:TT111 RON 114 MON 106 RVP 7 dist. 10/150 50/215 90/235 Spec. Grav .725 Now for the torco RON 116 MON 108.5 RVP 7 dist. 10/160 50/211 90/246 spec grav .719 :)

 

[Rich Rohrich]

Was the Torco 110 from a fresh, sealed container?

 

[hot125mod]

it came from a pump BTW is the flame speed closely related to the dist curve.

 

[hot125mod]

but he had it in a race jug

 

[Rich Rohrich]

it came from a pump

Then you have no idea what you put in the bike. Get a sealed 5 gallon drum and see how it reacts.


The specs from the Torco website look different than the ones you posted.

MACH 110
Typical Properties
Color : Purple
Specific Gravity : .719
Pump Octane (R+M)/2 : 110
MON : 108.5
RON : 116
Reid Vapor Pressure : 7
Distillation : F
10% Evap : 160
90% Evap : 211
End Point : 246
DIELECTRIC : -1.1

is the flame speed closely related to the dist curve.

They are not specifically related. Flame speed is a function of the Carbon and Hydrogen makeup of the major components in the fuel. Don't lose any sleep over it. Flame speed doesn't vary all that much between fuels, and it is irrelevant in your application anyway.

 

[hot125mod]

oh i wrote the 90% 246 but it was actually the end point thanks for the heads up Rich. so why was the jetting so different?

 

[Rich Rohrich]

oh i wrote the 90% 246 but it was actually the end point thanks for the heads up Rich. so why was it different?

You are using fuel from a ground tank of unknown purity, so it's anyone's guess what is really in the fuel. If I had to hazard a guess, I would say the fuel is contaminated with a high percentage of high temperature components that aren't vaporizing. As a result you have to add more fuel just to get enough fuel vaporized to match the air mass in the chamber. same thing happens with pump fuel, and race fuels with high 50, 90 and EP temps. The low ends of the fuel might have boiled off, which would explain the pilot change.

Until you test with Torco 110 from a sealed container, you'll just be guessing.

 

[hot125mod]

he is going to switch to the tt111. After I rebuild it for him cause to totally botched the power valves and it hit the piston.

 

[hot125mod]

does the name c12 have anything to do with the number of molecules hydrogen/carbon or is it directly related to a part of the fuel chemistry or is it just a name.

 

[Rich Rohrich]

It's just a name. Here's some info on hydrocarbons from Bruce Hamilton's outstanding FAQ on gasoline that might make it a bit clearer.

Check out section 4.4 specifically.

http://www.faqs.org/faqs/autos/gasoline-faq/part1/

 

[hot125mod]

sweet just paged through that article it is going to be fun to read, thanks rich.