Lotus Elite Type 14

EB 1821 Engine Specification


Engine prepared by Hutton Motor Engineering and delivered February 2005

FWE400-31-9843

Bore: 3.032” (77 mm)
Stroke: 2.625” (66.68 mm)

Cylinder Head

Combustion Chamber Volumes:
1
 28.8 cc
2
 28.7 cc
3
 29.0 cc
4
 29.0 cc

Valve Seat Widths:
Inlet: 0.040”
Exhaust: 0.060

Head Gasket:
Type: Cometic
Compressed Thickness: 0.045"

Camshaft Carrier

New alloy Stage III, shortened 0.020”

Valve Train

Stimson valve springs
Installed height: 1.255"
Seat pressure: 100 psi combined inner/outer at 1.240"
Open pressure: 195 psi combined inner/outer at 0.940"

Camshaft

Type 91034 St. IV

Lobe Lift:
Inlet: 0.400"
Exhaust: 0.350"

Valve Clearance:
Inlet: 0.006"
Exhaust: 0.008"

Valve Timing (using above clearance):
Inlet Maximum Lift Point: 101º ATDC
Exhaust Maximum Lift Point: 105º BTDC

Valve Clearance Shim Thicknesses

Cylinder
 Inlet
 Exhaust
1 0.090"
 0.077"
2
 0.089" 0.077"
3
 0.088" 0.077"
4
 0.088" 0.078"

Cylinder Block

Bore Diameter: 3.030"
Liner to Block Clearance: 0.001"
Height Above Block Deck: 0.00100" to 0.00125"

Crankshaft

Rody 28 lbs.

Measured Stroke: 2.625"

Main Journal Diameter:
1
 2.12450"
2
 2.12450"
3
 2.12450"

Main Bearing Clearance
1
 0.00225"
2
 0.00225"
3
 0.00225"

Fitted End Float: 0.004/0.005"

Connecting Rods

Big End Housing Diameter: 2.0210"

Big End to Crankshaft Side Clearance:
1
 0.0030"
2
 0.0030"
3
 0.0035"
4
 0.0040"

Bolt Diameter: 5/16" ARP

Bolt Torque or Stretch: 30 ft/lbs.

Weight
1
 433g
2
 433g
3
 433g
4
 433g

Pistons

Type: JE Domed

Compression Ratio: 11:1

Diameter:
1
 3.0270"
2
 3.0270"
3
 3.0275"
4
 3.0275"
Measured at 90º tp in
Bottom of skirt: 3.0310" to 3.0315"

Weight
1
 363g
2
 364g
3
 364g
4
 365g

Pin Diamter, Minimum: 0.748" (19mm)

Piston Rings

Type: JE

Fitted End Gap, Average:
1st 0.016 - 0.018"
2nd 0.015 - 0.018"

Ring Thickness, Average:
1st 0.039"
2nd 0.047"

Oil Pump

Gear End Float:
Driving: 0.001"
Driven: 0.001"

Ignition System

Points Gap: 0.016"
Advance:: 33º Maximu, 5º Idle
Spark Plugs:
Type: N3C
Gap: 0.020"

Induction System

Type: Dual Weber 40 DCOE 139

Carburetor Jetting:
Main
 138
Emulsion
 F41
Air
 160
Idle
 59F21
Pump
 40
Choke
 32mm
Aux Vent
 6

Test Results

Cranking Compression:
1
 240psi
2
 240psi
3
 235psi
4
 235psi

Cylinder Leak Down (warm):
1 3%
2
 3%
3
 3%
4
 3%

Final Oil Pressure, Hot: Maximum 70 psi at 160º F

Break-in Procedure/Maintenance Notes
February 2005
 Engine installed in test vehicle and driven in excess of 150 miles.  Removed and re-torqued cylinder head and re-adjusted valve clearances.
Change oil at 300 miles.
Check valve clearances at 2000 miles.
October 2006
 Engine installed in EB1821 and driven approximately 200 miles.
Oil (Valvoline VR1 SAE30) and filter (Coopers G714) changed at odometer reading of 46,935 miles.
February 28, 2007
 Rolling road dynamometer session at Northampton Motorsport at odometer reading 47,118 miles.
Main carburetor jets changed from 138 to 145.  Fuel pressure raised from 2.5 to 4.0 psi.
Max power speed
 6470 rpm (95.1 mph in 4th gear)
Power at flywheel (corrected)
 105.9 bhp (DIN 70020)
Power at flywheel (measured)
 103.0 bhp
Power at wheels
 64.9 bhp
Power loss (transmission, tyres, etc.)
 38.1 bhp
Max torque speed
 5075 rpm (74.9 mph in 4th gear)
Max engine torque
 91.2 lb ft
Max road speed reached in test
 104.6 mph
Max engine speed reached in test
 7116 rpm
Min ambient temperature
 15 deg C
Max ambient temperature
 15 deg C
Barometric pressure
 977 mb








Home