Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp engine DIY maintenance and service manual

General Information

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp is an 235.5 in³ (3.86 L) internal combustion reciprocating Inline 6 engine. It has bore/stroke ratio of 3.5625 in × 3.9375 in (9.0488 cm × 10.0012 cm), and uses 8.25:1 compression. This engine was rated 115 hp (85.76 kW) at 3600 rpm and 195 lbf⋅ft (264.38 N⋅m) of torque at 2000 rpm. It was used in Chevrolet, GMC, and Pontiac cars.

Some versions of this engine also known under the names „Loadmaster“, „Load-master“, „Thriftmaster“, „Thrift-master“, and „Chevrolet straight-6 generation II“.

Engine Performance Rating

SAE J1995 (SAE Gross)

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp engine performance rating according to SAE J1995 (SAE Gross) standard.
Parameter	Output
Power Rating	135 hp (100.67 kW) at 4000 RPM
Torque Rating	294.21 N⋅m217 lbf⋅ft217 lbf⋅ft at 2000 RPM

SAE J1349 (SAE Net)

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp engine performance rating according to SAE J1349 (SAE Net) standard.
Parameter	Output
Power Rating	115 hp (85.76 kW) at 3600 RPM
Torque Rating	264.38 N⋅m195 lbf⋅ft195 lbf⋅ft at 2000 RPM

Specifications

General

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp engine general specifications.
Parameter	Value
Type	Internal Combustion Reciprocating
Fuel Type	Gasoline
Cylinder Configuration	Inline 6
Engine Displacement	3.86 L235.5 in³235.5 in³
Bore	9.0488 cm3.5625 in3.5625 in
Stroke	10.0012 cm3.9375 in3.9375 in
Compression Ratio	8.25:1
Firing Order	1-5-3-6-2-4
Curb Weight	283.5 kg625 lb625 lb
Curb Idle Speed	450-475 RPMs

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Block, crankshaft and pistons

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp engine block, crankshaft and pistons specifications.
Parameter	Value
Block Material	Cast Iron
Crankshaft Material	Forged, high carbon steel
Piston Material	Cast alloy aluminum with steel struts; flat head; cam ground; 3 ring grooves above piston pin
Piston Pin Material	Tubular, hardened chrome-alloy steel
Connecting Rod Material	Forged carbon steel; I-beam section

Spark Plugs and Wires

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp spark plugs and wires specifications.
Parameter	Value
Spark Plugs	AC Delco 45
Spark Plug Size	0.55 in0.55 in14 mm
Spark Plug Gap	889 μm0.035 in0.035 in

Engine head and valvetrain

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp engine head and valvetrain specifications.
Parameter	Value
Head Material	Cast iron
Valvetrain Type	OHV
Valves per Cylinder	2
Camshaft Material	Cast alloy iron

Air Intake

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp air intake specifications.
Parameter	Value
Air Intake Method	Naturally Aspirated

Fuel Injection

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp fuel injection specifications.
Parameter	Value
Injection Type	Carburetor
Injection Info	Downdraft Rochester with manual choke control

Valve Timings

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp valve timings.
Parameter	Value
Intake Opens	3° B.T.D.C.
Intake Closes	35° A.B.D.C.
Intake Duration	218°
Exhaust Opens	46° B.B.D.C.
Exhaust Closes	5° A.T.D.C.
Exhaust Duration	231°
Valves Overlap	89°
Ignition Timing	5° B.T.C.

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp valve timing diagram.

Oil Pump

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp oil pump specifications.
Parameter	Value
Oil Pump	Spur-gear type driven by distributor shaft
Oil Pump Pressure	2.04 atm.30 Psi30 Psi at 2400 RPM
Oil Pump Capacity	15.52 lpm3.41 UK gpm4.1 US gpm at 2400 RPM

Water Pump

Chevrolet gasoline Straight-6 Second generation (Blue Flame) 235 CID (3.9 L) Thriftmaster 115 hp water pump specifications.
Parameter	Value
Water Pump	Centrifugal type driven by fan belt
Water Pump Capacity	208.18 lpm45.79 UK gpm55 US gpm at 4000 RPM