Aviation gas, vs Race gas

[Powder Pounder]

Correct me if I'm wrong, but I think avi gas is 100 octain, and race is 110 right? I'm looking at an MPI stage one, which needs 50-50 pump gas/race gas. Now is the pump gas they base their mix on, 87, or 91 octain? I don't think I can get race gas around here, so why not use avi gas? Then I would need to run a higher avi percent avi gas then pump gas. Any body good enough with their numbers to figure that out? Or do you guys see a problem with this idea?

 

[HAMMER]

Tuesday, 31 January 2006

The following results were compiled by Intertek (fuel testing service)

OBJECTIVE:

To establish the RON (research octane number) and MON (motor octane number)

MON number is a better indication of fuel quality because it is more representative of high rpm, high load, conditions. The closer the RON and MON are the more stable the fuel is.

METHOD:

Use of CFR research engine with variable compression.
All test work carried out to ASTM D2699/D2700 standards.

RESULT:

100LL (Avgas) 100.5 MON and 103.2 RON (101.5 AKI)
91 premium unleaded 86.7 MON and 95.8 RON (91.2 AKI)

75% Avgas + 25% premium unleaded 92.9 MON 101.5 RON (97.2 AKI)
50% Avgas + 50% premium unleaded 91.6 MON 100.3 RON (95.9 AKI)
25% Avgas + 75% premium unleaded 88.5 MON 98.8 RON (93.6 AKI)

===============================================

Examples of fuel properties:

Sunoco 110
Specific Gravity 0.72
Research Octane 115
Motor Octane 105
Reid Vapor Pressure 8.0
Boiling Point (liquid to vapor)
10% Evaporation 160
90% Evaporation 260

100LL (Avgas)
Specific Gravity 0.67
Research Octane 103.2
Motor Octane 100.5
Reid Vapor Pressure 7.0
Boiling Point (liquid to vapor)
10% Evaporation 75
90% Evaporation 135

Torco 100 (Unleaded oxygenated)
Specific Gravity 0.75
Research Octane 101
Motor Octane 100
Reid Vapor Pressure 8.0
Boiling Point (liquid to vapor)
10% Evaporation 133
90% Evaporation 205

VP C10 (Unleaded non-oxygenated)
Specific Gravity 0.76
Research Octane 104
Motor Octane 96
Reid Vapor Pressure 1.9
Boiling Point (liquid to vapor)
10% Evaporation 212
90% Evaporation 266

 

[venom]

anybody know the price diff between avgas & race fuel?got to buy some right away riding in 5 days.45 gallons of c111 vp race fuel @$660 canadian good or bad?

 

[Powder Pounder]

Wow thanks HAMMER, just the info I was looking for.

venom, I don't know how good that price is, but avgas around here is 1.25 gallon I think. I think. I forget just what it was.

 

[HAMMER]

...

U.S.
------
http://www.100ll.com/
------

CANADA
------
http://www.copanational.org/PlacesToFly/airport_fuel.php
------

 

[canuck5]

Hey Venom $660 is high E&S motorsports in Fort Sask sells for $100 less just picked up a barrel of 111 myself easy stop if your going to the mountains.

 

[HAMMER]

Do you know the motor octane of VP C111 can't find it on there site?

Never heard of VP C111.

 

[RED]

Hammer my vp dealer told me that vp111 was made for above the 49th, suppose to have winter prop to help start in colder climates, etc, its is close to vp110, vp111 has 107 octane.

 

[TurboJamie]

I run VP MS98L in my sled with I want to go radar running etc, its the highest octane content they make with no lead.

 

[HAMMER]

VP MS98L...highest octane content they make with no lead

Found a website that shows this:

MS 98L (Leaded Non-Oxygenated)
Specific Gravity: .715
Color: Light Blue
Motor Octane: 96
RVP: 6.7
10% evap @ 161.1
90% evap @ 230.7

VP C-11 (Leaded Oxygenated)
Specific Gravity: .710
Color: Orange or Purple
Motor Octane: 104
RVP: 8.54
10% evap@ 128.6
90% evap@ 227.1

MOTORSPORT 109 (Unleaded Oxygenated)
Specific Gravity: .722
Color: Clear
Motor Octane: 101
RVP: 6.17
10% evap@ 147.0
90% evap@ 213.3

 

[venom]

canuck5 i bought my sled from there in 06 also had darrin do the s/c install.provided them with some good business brought in some customers also.thats where i got my price from.i was going to pick it up on the way to revy.think we need to have a serious talk.thanks for the info guys.hammer finally there was something u haven't herd of lol,

 

[HAMMER]

finally there was something u haven't herd of lol

Yes, but I did find out it exists, and NOW I know about it....lol

Like RED said, the RVP, and initial evap is probably better than straight 110 for those Canadian cold starts.

...

Here's C-11 ???
-----
http://www.vpracingfuels.com/spec/techbulletin-c11.doc
-----

 

[doo_man]

So is AV gas safe to use? Called MPI today and they said 110 octane race fuel only. I am only using a stage 1 SC on a RX-1 and want to be sure I'm using the right fuel.

 

[BlgsRX-1mtn]

So is AV gas safe to use? Called MPI today and they said 110 octane race fuel only. I am only using a stage 1 SC on a RX-1 and want to be sure I'm using the right fuel.

I have run it when I can't get race fuel in my '03SCRX-1mtn. I wouldn't get crazy like I did this past weekend (couldn't get race gas to top off). I pushed the envelope by runnning the 100LL Av-Gas with Prem 91 pump in a 50/50 blend.

I don't run a knock box (might be a good idea) but the sled seemed to run better than with race fuel/prem mixtures in the past. It had a knoticable power surge around 6000 RPM similar to a trubo spooling up. My A/f readings were upper1s to lower 12s with water temps of 162.8 in powder and SC oil readings of 90s.
If I were to try the 50/50 Av Gas/Prem again I would definately want a knock box for piece of mind.

Jim

 

[Boyko]

Do you know the motor octane of VP C111 can't find it on there site?

Never heard of VP C111.

the can of C111 I got has no color to it and is not listed on VPs website. A drum of 111 out weights 116 by 29lbs.