LP and NG in a pilot ignition diesel are two different situations.
NG with it's RON octane of 120 doesn't suffer detonation even a turbo diesel. LP on the other hand with a MON of only 97 will knock in a diesel once the mixture is richened above the lover explosive limit. So thus a LP assisted diesel can only use LP to make 20-30% of it's power.
Power generation,irrigation pump and operators or other such applications. Many have reduced operating costs by operating the injection pump rack setting at slow idle delivery. Then adding NG to the intake air to make near rated power levels. No need to add spark plugs etc. Engine can also run on 100% diesel as a backup. Much lower stack emissions of HC, soot and CO however NOX levels are not reduced.
An octane chart curtosey of wikipedia. No wonder why the pulling tractor's knock goes away when a dose of 100LL is mixed with the 91 octane pump gas.
The RON/MON values of n-heptane and iso-octane are exactly 0 and 100, respectively, by the definition of octane rating. The following table lists octane ratings for various other fuels.[8][9]
Fuel RON MON AKI
methane 120 120 120
xylene 118 115 116.5
toluene 121 107 114
2,2,3-trimethylbutane 112.1[18] 101.3[18] 106
"isooctane" (RON and MON 100 by definition) 100 100 100
2,2,3-trimethylpentane 109.6[18] 99.9[18] 105
ExxonMobil Avgas 100[14] 99.5 (min)
2,3,3-trimethylpentane 106.1[18] 99.4[18] 103
isopropanol 118 98 108
i-butane 102[16] 97.6
propane 112 97
2,3-dimethylbutane 94.4
2,2-dimethylbutane 93.4
"BP Ultimate 102 - now discontinued"[17] 102 93–94 97–98
t-butanol 103 91 97
Isopentane (methylbutane) 90.3
n-butane 94[11] 90.1
ethanol 108.6[21] 89.7[21] 99.15
Shell "V-Power 98", Caltex "Platinum 98 with Techron", Esso Mobil "Synergy 8000" and SPC "LEVO 98" in Singapore 98 89–90 93–94
BP Ultimate 98/Mobil Synergy 8000 in New Zealand 98 89-90 93-94
Great Britain, Slovenia and Spain, "SP98" in France 98 89–90 93–94
methanol 108.7[21] 88.6[21] 98.65
2,5-Dimethylfuran 101.3[22] 88.1[22] 94.7[22]
"SuperPlus" in Germany 98 88
Shell V-Power in Italy and Germany 100 88
Petro-Canada "Ultra 94" in Canada [13] 101.5 88 94
Aral SuperPlus 98 in Germany 98 88
Aral Ultimate 102 in Germany 102 88
"Premium" or "Super unleaded" gasoline in US (10% ethanol blend) 97 87-88 92-93
Tesco "Momentum^99"[12] in UK 99 87
Eni(or Agip) Blu Super +(or Tech) in Italy 100 87 94
Pertamina "Pertamax Plus" gasoline in Indonesia 95 85 90
Super/Premium in New Zealand, Australia 95 85 90
"EuroSuper" or "EuroPremium" or "Regular unleaded" in Europe, "SP95" in France 95 85–86 90–91
Aral Super 95 in Germany 95 85
Aral Super 95 E10 (10% Ethanol) in Germany 95 85
E85 gasoline 102-105 85-87 94-96[19]
"regular" gasoline in Australia, New Zealand, Canada and the US 91–92 82–83 87
Pertamina "Pertamax" gasoline in Indonesia 92 82 87
Neopentane (dimethylpropane) 80.2
Pertamina "Premium" gasoline in Indonesia 88 78 83
n-butanol 92 71 83
requirement for a typical two-stroke outboard motor[10] 69 65 67
n-pentane 62 61.9
3-methylhexane 55.0
2-methylhexane 44 46.4
n-hexane 25 26.0 26
2-methylheptane 23 23.8
hexadecane < −30
n-octane −20
n-heptane (RON and MON 0 by definition) 0 0 0
diesel fuel 15–25
1-pentene 34
1-heptene 60
"Regular" gasoline in Japan (Japanese Industrial Standards) 90
Shell "Super" in Indonesia 92
Total "Performance 92" in Indonesia 92
Shell "V-Power" in Indonesia 95
Total "Performance 95" in Indonesia 95
Shell "FuelSave " in Malaysia 95
Shell "V-Power 97" in Malaysia 97
"Premium" gasoline in Japan (Japanese Industrial Standards) 100
Pertamina "Pertamax Racing" in Indonesia 100
IP Plus 100 in Italy 100
Tamoil WR 100 in Italy 100
San Marco Petroli F-101 in Italy(northern Italy only, just a few gas stations) 101
IES 98 Plus in Italy 98
Shell "V-Power Racing" in Australia - discontinued July 2008 [15] 100
benzene 101
ethane 108
1-propanol 118[20] 108[20]
hydrogen > 130
