Lycoming Engine

Compression ratio and 100LL?

Why do Lycoming's O-360 related engines use 100ll when they only have compression ratios of 8.6 or less? A regular car engine, such as the jeep 4.7ho have compression ratios of 9.7:1 and can use 87 without ill effects.
There are some STC's out there that increase the stroke, which increases displacement and compression up to 9.9:1, and they still use 100ll, so what is with the low compression models?
Is it something to do with standardization with the turbo models?

they are air cooled engines that produce hot spots which can cause detonation if the octane is not high enough to prolong the burning process of combustion..

Lycoming GSO 480  IGSO 480 Aircraft Engines Parts Catalog
Lycoming GSO 480 IGSO 480 Aircraft Engines Parts Catalog
$24.99
Time Remaining: 1h 49m
Buy It Now for only: $24.99

lycoming 74641
lycoming 74641
$145.00
Time Remaining: 2h 55m
Buy It Now for only: $145.00

Lycoming O 360 A1A Engine W Accessories GREAT COMPRESSIONS
Lycoming O 360 A1A Engine W Accessories GREAT COMPRESSIONS
$3,500.00 (1 Bid)
Time Remaining: 4h 29m

Lycoming Operation Info Manual ORIGINAL Aviation Aircraft Avco TIO 541 engine
Lycoming Operation Info Manual ORIGINAL Aviation Aircraft Avco TIO 541 engine
$39.00
Time Remaining: 4h 35m
Buy It Now for only: $39.00

LYCOMING O 360 AIRCRAFT ENGINE DRIVEN FUEL PUMP FOR CARBURETOR
LYCOMING O 360 AIRCRAFT ENGINE DRIVEN FUEL PUMP FOR CARBURETOR
$75.00
Time Remaining: 5h 45m

6 AIRCRAFT ENGINE SPARK PLUG DESICANT DEHYDRATOR SILICA CESSNA PIPER LYCOMING
6 AIRCRAFT ENGINE SPARK PLUG DESICANT DEHYDRATOR SILICA CESSNA PIPER LYCOMING
$11.99
Time Remaining: 5h 56m

OVERHAUL 1 CYLINDER FOR CONTINENTAL OR LYCOMING
OVERHAUL 1 CYLINDER FOR CONTINENTAL OR LYCOMING
$325.00
Time Remaining: 6h 28m

OVERHAUL 4 CYLINDERS FOR CONTINENTAL OR LYCOMING
OVERHAUL 4 CYLINDERS FOR CONTINENTAL OR LYCOMING
$1,250.00
Time Remaining: 6h 30m

OVERHAUL 6 CYLINDERS FOR CONTINENTAL OR LYCOMING
OVERHAUL 6 CYLINDERS FOR CONTINENTAL OR LYCOMING
$1,850.00
Time Remaining: 6h 30m

Eight 61662 Lycoming Connecting Rod Bearing Halves O 235O 290 O 320 O 435
Eight 61662 Lycoming Connecting Rod Bearing Halves O 235O 290 O 320 O 435
$45.00
Time Remaining: 6h 42m
Buy It Now for only: $65.00

Lycoming Accessory Cover O 235 O 290 O 320  Other Engines
Lycoming Accessory Cover O 235 O 290 O 320 Other Engines
$85.00
Time Remaining: 6h 42m
Buy It Now for only: $120.00

8 NOS Lycoming Connecting Rod Bearing Halves O 235O 290 O 320 O 435 O 540
8 NOS Lycoming Connecting Rod Bearing Halves O 235O 290 O 320 O 435 O 540
$40.00
Time Remaining: 6h 42m
Buy It Now for only: $60.00

Lycoming Accessory Cover O 235 O 290 O 320  Other Engines
Lycoming Accessory Cover O 235 O 290 O 320 Other Engines
$85.00 (1 Bid)
Time Remaining: 6h 42m

Eight NOS Lycoming Push Rod Tubes P N 65006 For O290 O235  O320
Eight NOS Lycoming Push Rod Tubes P N 65006 For O290 O235 O320
$45.00 (1 Bid)
Time Remaining: 6h 42m

NOS Lycoming Outer Valve Springs P N 76994 O 235 O 290 O 320 O 540
NOS Lycoming Outer Valve Springs P N 76994 O 235 O 290 O 320 O 540
$45.00
Time Remaining: 6h 45m
Buy It Now for only: $75.00

Lycoming O 540 A Series Engines Operators Manual
Lycoming O 540 A Series Engines Operators Manual
$61.98
Time Remaining: 16h 39m
Buy It Now for only: $61.98

LYCOMING ENGINE O 360 A1G6D GOOD CORE WITH ALL ACCESSORIES
LYCOMING ENGINE O 360 A1G6D GOOD CORE WITH ALL ACCESSORIES
$5,500.00
Time Remaining: 17h 15m
Buy It Now for only: $5,500.00

LYCOMING ENGINE LO 360 A1G6D GOOD CORE WITH ALL ACCESSORIES
LYCOMING ENGINE LO 360 A1G6D GOOD CORE WITH ALL ACCESSORIES
$5,500.00
Time Remaining: 17h 17m
Buy It Now for only: $5,500.00

LYCOMING STARTER AIRCRAFT NEEDS BRUSHES   0235
LYCOMING STARTER AIRCRAFT NEEDS BRUSHES 0235
$59.95
Time Remaining: 17h 20m
Buy It Now for only: $59.95

LYCOMING EXPERIMENTALNO SPILL 90 DEG OIL FILTER KIT
LYCOMING EXPERIMENTALNO SPILL 90 DEG OIL FILTER KIT
$289.00
Time Remaining: 18h 14m
Buy It Now for only: $289.00

LYCOMING OIL PUMP ASSEMBLY
LYCOMING OIL PUMP ASSEMBLY
$175.00 (1 Bid)
Time Remaining: 20h 14m

LYCOMING OIL DRAIN TUBES O 360 O 320
LYCOMING OIL DRAIN TUBES O 360 O 320
$45.00 (1 Bid)
Time Remaining: 20h 15m

Lycoming IO 720 D1CD  IO 720 D1C Engine Parts Manual
Lycoming IO 720 D1CD IO 720 D1C Engine Parts Manual
$62.03
Time Remaining: 20h 34m
Buy It Now for only: $62.03

LYCOMING OIL PRESSURE ADJUSTER USED0
LYCOMING OIL PRESSURE ADJUSTER USED0
$81.00 (3 Bids)
Time Remaining: 20h 35m

LYCOMING VERNATHERM USED
LYCOMING VERNATHERM USED
$65.00
Time Remaining: 20h 37m
Buy It Now for only: $85.00

Lycoming Oil Level Gauge Assy P N LW 14759 8 Quart O 290 D
Lycoming Oil Level Gauge Assy P N LW 14759 8 Quart O 290 D
$70.00
Time Remaining: 21h 18m
Buy It Now for only: $70.00

Lycoming 290 320 360 Crankshaft Plain Idler Gear Assy P N 74996
Lycoming 290 320 360 Crankshaft Plain Idler Gear Assy P N 74996
$20.00
Time Remaining: 21h 53m
Buy It Now for only: $20.00

Lycoming Exhaust Stack Flange 3 x 175 x 035 in PAS7796 BH 53 023
Lycoming Exhaust Stack Flange 3 x 175 x 035 in PAS7796 BH 53 023
$35.00
Time Remaining: 1d 2h 31m
Buy It Now for only: $35.00

Lycoming Exhaust Stack Flange 2 5 16 x 175 x 035 in PAS19390 BH 53 207
Lycoming Exhaust Stack Flange 2 5 16 x 175 x 035 in PAS19390 BH 53 207
$30.00
Time Remaining: 1d 2h 33m
Buy It Now for only: $30.00

Lycoming Crankshaft for TIGO 541 E1A Yellow Tagged
Lycoming Crankshaft for TIGO 541 E1A Yellow Tagged
$4,399.00
Time Remaining: 1d 4h 3m
Buy It Now for only: $4,399.00

Lycoming Connecting Rod Bolts and Nuts 0 540 engine
Lycoming Connecting Rod Bolts and Nuts 0 540 engine
$100.00
Time Remaining: 1d 4h 14m
Buy It Now for only: $100.00

Lycoming Crankshaft for TO 360 C1A6D Big Main Yellow Tagged
Lycoming Crankshaft for TO 360 C1A6D Big Main Yellow Tagged
$2,999.00
Time Remaining: 1d 4h 36m
Buy It Now for only: $2,999.00

Cessna R182 Engine Mount Lycoming O 540 Engine Mount 182RG
Cessna R182 Engine Mount Lycoming O 540 Engine Mount 182RG
$485.00
Time Remaining: 1d 5h 29m
Buy It Now for only: $485.00

Lamar 24 volt starter PM 2401 Lycoming 0 320360540
Lamar 24 volt starter PM 2401 Lycoming 0 320360540
$110.00
Time Remaining: 1d 5h 30m

MANIFOLD PRESS FUEL FLOW GAUGE WAS USED WITH A LYCOMING IO 360 ENGINE
MANIFOLD PRESS FUEL FLOW GAUGE WAS USED WITH A LYCOMING IO 360 ENGINE
$99.00
Time Remaining: 1d 6h 14m
Buy It Now for only: $99.00

Lycoming IO 720 Magneto 8 cylinder Zee Jay 171335 ZJ STC  SE1256SW FAA PMA used
Lycoming IO 720 Magneto 8 cylinder Zee Jay 171335 ZJ STC SE1256SW FAA PMA used
$225.00
Time Remaining: 1d 7h 1m
Buy It Now for only: $225.00

Lycoming 0 IO TSIO 540 Engine Mount Supports Ears
Lycoming 0 IO TSIO 540 Engine Mount Supports Ears
$175.00
Time Remaining: 1d 7h 35m
Buy It Now for only: $175.00

Lycoming piston LW 10545 S 731 compression ratio set of six 6
Lycoming piston LW 10545 S 731 compression ratio set of six 6
$300.00
Time Remaining: 1d 7h 55m
Buy It Now for only: $300.00

Lycoming O 235 P20 P N 73851 New Piston
Lycoming O 235 P20 P N 73851 New Piston
$27.50
Time Remaining: 1d 14h 39m

Lycoming GO 435 C2 Engine Operating Manual
Lycoming GO 435 C2 Engine Operating Manual
$62.03
Time Remaining: 1d 16h 52m
Buy It Now for only: $62.03

4 SPARK PLUG DEHYDRATOR ENGINE SILICA DESICCANT LYCOMING CONTINENTAL TCM
4 SPARK PLUG DEHYDRATOR ENGINE SILICA DESICCANT LYCOMING CONTINENTAL TCM
$7.99
Time Remaining: 1d 17h 15m

Lycoming Camshaft O 540 IO 540 8130 3 Yellow Tag May 2014
Lycoming Camshaft O 540 IO 540 8130 3 Yellow Tag May 2014
$385.00 (1 Bid)
Time Remaining: 1d 17h 58m

Lycoming Engine O 235 C and O 290 D Series Overhaul Manual
Lycoming Engine O 235 C and O 290 D Series Overhaul Manual
$65.71
Time Remaining: 1d 19h 55m
Buy It Now for only: $65.71

Lycoming O360 O 360 A1D Engine Mount Mooney
Lycoming O360 O 360 A1D Engine Mount Mooney
$250.00
Time Remaining: 1d 20h
Buy It Now for only: $250.00

6 Six Lycoming LW 12688 P30 Valve Seats
6 Six Lycoming LW 12688 P30 Valve Seats
$90.00
Time Remaining: 1d 21h 47m
Buy It Now for only: $90.00

Lycoming Tempest fuel pump LW15473
Lycoming Tempest fuel pump LW15473
$100.00
Time Remaining: 1d 23h 38m

Bendix PS 5BD Carburetor on GO 435  GO 480 Lycoming Engines Overhaul manual
Bendix PS 5BD Carburetor on GO 435 GO 480 Lycoming Engines Overhaul manual
$164.89
Time Remaining: 2d 12m
Buy It Now for only: $164.89

Delco Remy Lycoming Starter 12 Volt
Delco Remy Lycoming Starter 12 Volt
$25.00
Time Remaining: 2d 3h 11m

Lycoming Turbocharged IO 540 N2BD 350HP Engine Piper PA 31 Navajo 12486
Lycoming Turbocharged IO 540 N2BD 350HP Engine Piper PA 31 Navajo 12486
$13,500.00
Time Remaining: 2d 3h 59m

Lycoming Turbocharged IO 540 N2BD 350HP Engine Piper PA 31 Navajo 12487
Lycoming Turbocharged IO 540 N2BD 350HP Engine Piper PA 31 Navajo 12487
$13,500.00
Time Remaining: 2d 3h 59m

Mount set for Kelly Aerospace Hartzell DOFF10300J Alternator to O 320 Lycoming
Mount set for Kelly Aerospace Hartzell DOFF10300J Alternator to O 320 Lycoming
$150.00
Time Remaining: 2d 4h 51m
Buy It Now for only: $150.00

Set of Crankshaft Bearings from Lycoming O 320 E2A
Set of Crankshaft Bearings from Lycoming O 320 E2A
$100.00
Time Remaining: 2d 4h 51m
Buy It Now for only: $100.00

8 AIRCRAFT SPARK PLUG DESICANT DEHYDRATOR SILICA CESSNA PIPER LYCOMING TCM
8 AIRCRAFT SPARK PLUG DESICANT DEHYDRATOR SILICA CESSNA PIPER LYCOMING TCM
$16.00
Time Remaining: 2d 6h 22m

7 fuel and pressure hoses w connectors from Lycoming 0320 from a Grumman AA1A
7 fuel and pressure hoses w connectors from Lycoming 0320 from a Grumman AA1A
$60.00
Time Remaining: 2d 9h 31m
Buy It Now for only: $60.00

LYCOMING STCd NO SPILL 90 DEGREE OIL FILTER KIT
LYCOMING STCd NO SPILL 90 DEGREE OIL FILTER KIT
$329.00
Time Remaining: 2d 13h 7m
Buy It Now for only: $329.00

LYCOMING AIR BOX FILTER SMALL SIZE
LYCOMING AIR BOX FILTER SMALL SIZE
$49.95
Time Remaining: 2d 14h 56m

Genuine Lycoming Cylinder Gaskets O 320360  540 Parallel Valve Engines
Genuine Lycoming Cylinder Gaskets O 320360 540 Parallel Valve Engines
$6.00
Time Remaining: 2d 16h 13m
Buy It Now for only: $6.00

Lycoming TIO 540 A2B Turbo Intake Tube
Lycoming TIO 540 A2B Turbo Intake Tube
$95.00
Time Remaining: 2d 16h 19m
Buy It Now for only: $95.00

Lycoming O 320 B series parts catalog Well illustrated
Lycoming O 320 B series parts catalog Well illustrated
$34.99
Time Remaining: 2d 16h 46m
Buy It Now for only: $34.99

Textron Lycoming 360 540 Flywheel Ring Gear P N LW 18506 3 Pulley
Textron Lycoming 360 540 Flywheel Ring Gear P N LW 18506 3 Pulley
$129.95
Time Remaining: 2d 16h 51m
Buy It Now for only: $249.95

Lycoming Flywheel IO 540 360 P N 72565 Textron Lycoming Piper
Lycoming Flywheel IO 540 360 P N 72565 Textron Lycoming Piper
$129.95
Time Remaining: 2d 16h 59m
Buy It Now for only: $249.95

Lycoming Flywheel IO 540 P N 77579 DE ICE Textron Piper Aztec PA23 250
Lycoming Flywheel IO 540 P N 77579 DE ICE Textron Piper Aztec PA23 250
$159.95
Time Remaining: 2d 17h 4m
Buy It Now for only: $289.95

Lycoming Flywheel ring gear Flywheel P N 75221 FLY WHEEL Piper Cessna
Lycoming Flywheel ring gear Flywheel P N 75221 FLY WHEEL Piper Cessna
$119.95
Time Remaining: 2d 17h 8m
Buy It Now for only: $239.95

Lycoming Flywheel ring gear P N 72245 FLY WHEEL Piper Mooney with Bulkhead
Lycoming Flywheel ring gear P N 72245 FLY WHEEL Piper Mooney with Bulkhead
$119.95
Time Remaining: 2d 17h 15m
Buy It Now for only: $239.95

Lycoming Flywheel P N 72565 FLY WHEEL Mooney with Bulkhead Small Pulley
Lycoming Flywheel P N 72565 FLY WHEEL Mooney with Bulkhead Small Pulley
$119.95 (1 Bid)
Time Remaining: 2d 17h 27m
Buy It Now for only: $239.95

Lycoming Alternator Bracket Tensioner PN C07A22097
Lycoming Alternator Bracket Tensioner PN C07A22097
$320.00
Time Remaining: 2d 17h 30m
Buy It Now for only: $320.00

Lycoming Flywheel P N 75030 FLY WHEEL with DE ICE 3 Blade Propeller IO 540
Lycoming Flywheel P N 75030 FLY WHEEL with DE ICE 3 Blade Propeller IO 540
$149.95
Time Remaining: 2d 17h 31m
Buy It Now for only: $289.95

Lycoming Flywheel P N 68867 FLY WHEEL O 320 Series 75in Pulley Cessna Piper
Lycoming Flywheel P N 68867 FLY WHEEL O 320 Series 75in Pulley Cessna Piper
$109.95
Time Remaining: 2d 17h 42m
Buy It Now for only: $219.95

Lycoming Flywheel P N 77579 DE ICE Ring Piper Aztec PA23 250
Lycoming Flywheel P N 77579 DE ICE Ring Piper Aztec PA23 250
$149.95
Time Remaining: 2d 17h 47m
Buy It Now for only: $259.95

Textron Lycoming Flywheel P N LW 16581 AIRBOAT Repairable damaged pulley
Textron Lycoming Flywheel P N LW 16581 AIRBOAT Repairable damaged pulley
$99.99
Time Remaining: 2d 18h 9m
Buy It Now for only: $145.95

Lycoming LW 11519 DE ICE Flywheel assembly Lycoming IO 540 Series
Lycoming LW 11519 DE ICE Flywheel assembly Lycoming IO 540 Series
$129.95
Time Remaining: 2d 18h 20m

Lycoming P N 74977 Dual Pulley Flywheel assembly Lycoming IO 540 Series
Lycoming P N 74977 Dual Pulley Flywheel assembly Lycoming IO 540 Series
$129.95
Time Remaining: 2d 18h 24m
Buy It Now for only: $189.95

Lycoming Flywheel P N 77579 DE ICE Ring 2 Blade ring gear Aztec
Lycoming Flywheel P N 77579 DE ICE Ring 2 Blade ring gear Aztec
$129.95
Time Remaining: 2d 18h 32m
Buy It Now for only: $269.95

Lycoming Flywheel LW 16471 AIRBOAT  Rusty ring gear Cheap IO 540 O 540
Lycoming Flywheel LW 16471 AIRBOAT Rusty ring gear Cheap IO 540 O 540
$99.95
Time Remaining: 2d 18h 38m
Buy It Now for only: $169.95

Hartzell Propellor Governor Lycoming 0 360
Hartzell Propellor Governor Lycoming 0 360
$45.00
Time Remaining: 2d 18h 47m

Lycoming 0 360 Cylinder Push Rod Oil Return Tubes
Lycoming 0 360 Cylinder Push Rod Oil Return Tubes
$25.00 (1 Bid)
Time Remaining: 2d 18h 47m


Comments are closed.