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Old 02-04-2010, 11:02 PM
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Default Avgas facts

Not sure where to put this.

Bunch of info I scrounged up on Avgas. Just to get the facts out instead of everyone not knowing.

Heres some info from conoco phillips. Look down to the octane lean. That is the MON rating.

http://www.experimentalaircraft.info...vgas-specs.pdf



Additives - AO Antioxidants mg/gal 45.4

Additives - Conductivity Conductivity Improver 842

Additives - Dye Blue Dye mg/gal 10.2 805

Additives - General Note General Note 878

API Gravity (60 Deg F) D 4052 Density & Rel Dens API Report

Appearance D 4176 Wtr & Part Cont, Proc 1 Pass 841

Color, Visual D 2392 Color of Dyed Av Gas Blue

Copper Strip Corrosion D 130 Cu Str 2 Hr @ 212 F Rating 1b

Dist 10 Vol% Evap D 86 Dist at Atm Press Deg F 167

Dist 10%+50% Evap D 86 Dist at Atm Press Deg F 275

Dist 40 Vol% Evap D 86 Dist at Atm Press Deg F 167

Dist 50 Vol% Evap D 86 Dist at Atm Press Deg F 221

Dist 90 Vol% Evap D 86 Dist at Atm Press Deg F 275

Dist End Pt, corr D 86 Dist at Atm Press Deg F 338

Dist IBP, corr D 86 Dist at Atm Press Deg F Report

Dist Loss, corr D 86 Dist at Atm Press Vol% 1.5

Dist Recov, corr D 86 Dist at Atm Press Vol% 97

Dist Residue D 86 Dist at Atm Press Vol% 1.5

Freeze Pt D 2386 Freeze Pt by manual Deg C -58 808

Lead (Pb) D 5059 Lead by X-ray Spec gPb/gal 2.12

Lead as TEL eq D 5059 Lead by X-ray Spec ml TEL/gal 2.00

Net Heat of Combustion D 3338 Net Heat of Comb BTU/lb 18,720 835

Octane, Lean Number D 2700 Knock Charac by Motor 99.5

Octane, Performance No. D 909 Knock by Supercharge 130.0 809

Ox Stab, Lead Precip D 873 Ox Stab, 5 hrs aging mg/100ml 3 851

Ox Stab, Potential Gum D 873 Ox Stab, 5 hrs aging mg/100ml 6 851

Sulfur D 2622 S by X-ray Fluo Spec Wt% 0.05

Vapor Pressure (ASTM D 5191 VP Grabner (ASTM eq) psi 5.5 7.1

Water Rxn Vol Change D 1094 Water Rxn by manual ml + or - 2

Other - See Note Referee Methods 826

Other - See Note Test Tolerances





From Shell

http://www.docstoc.com/docs/7671746/...nd-Avgas-100LL)



Typical Properties

Property

Max Value

Min Value

Knock Rating, Lean Mixture (Motor Method) Octane Number 99.5

Knock Rating, Rich Mixture (Supercharge Method) Performance Number 130

Freezing Point C -58

Distillation end point C 170

Reid Vapour Pressure @ 38C kPa 49 38

Sulphur content %m 0.05

Tetraethyl lead content gPb/l Avgas 100LL 0.56



Colour Blue





From BP, Though I have found other literature from BP stating that the Motor octane is 99.5 minimum, this is what is shown.

http://www.bp.com/liveassets/bp_inte...ok_04004_1.pdf



BP AVGAS 100LL

Specifications

British Def Stan 91-90

USA ASTM D910

Typical Properties

Knock rating

Lean mixture, aviation rating 105

Rich mixture, supercharge method 133

Tetraethyl lead, gPb/l 0.52

Colour Blue

Specific energy, net, MJ/kg 43.73

Density at 15C, kg/m3 715

Distillation

Initial boiling point, C 41

10% vol. evaporated at C 58

40% vol. evaporated at C 92

50% vol. evaporated at C 101

90% vol. evaporated at C 128

Final boiling point, C 156

Sum of 10% and 50% evaporated temperatures, C 164

Recovery, % vol 98

Residue, % vol 1

Loss, % vol 1

Vapour pressure, kPa 41.6

Freezing point, C below -60

Sulphur, % mass 0.0003

Copper strip corrosion (2h at 100C) 1

Existent gum, mg/100ml 1

Oxidation stability

Potential gum, mg/100ml 0.5

Lead precipitate, mg/100ml 1.0

Water reaction

Volume change, ml Nil

Interface rating 1
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Old 02-04-2010, 11:27 PM
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Just to compare here.

Pump gas "87" octane regular is 82-83 MON or motor octane

Super or "92,93" octane is 87-88 MON.


The only race gas that I know is Sunoco 110 which is 105 MON
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Old 02-05-2010, 08:28 PM
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This was a post by hammer on totally yamaha a few years back. Now I wouldnt argue with this gentlmen about much.

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
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Last edited by Jim; 02-05-2010 at 08:35 PM.
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Old 02-06-2010, 07:45 AM
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Thanks Jim, that adds nicely to the info I posted. I notice the difference when mixed compared with the mathematical answer.
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Old 11-21-2012, 08:44 PM
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a good read!

http://www.vpracingfuels.com/page469677.html
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Old 11-22-2012, 01:04 AM
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I'd love to run avgas in my sled, but I found it really did kill the bottom end ...

I just mix %20 110RG/91 pump these days and have good bottom end.

Sucks cuz man I used to get that avgas cheap and easy too, lived right down the street from the airport
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