1991-1993 3.4 DOHC V6 "LQ1" Technical Information

[Series8217]

I found this gold mine in a vehicle information kit PDF for the 1992 Chevrolet Lumina (http://www.gmheritagecenter.com/docs/gm ... Lumina.pdf)

You can get the same data for other vehicles here: http://gmheritagecenter.com/gm-heritage ... -kits.html

These technical information sheets include extremely detailed information on the drivetrains and chassis. Drivetrain information includes some very nice information like the weights of internal and external components including the block, heads, camshafts, upper and lower intake manifolds, exhaust manifolds, pistons, and total dressed engine weight. It also includes operating fuel pressure and flow, water pump flow rate, and even such details as the clutch spring load, facing material, and number of rivets.

Chassis data includes spring rates, swaybar thickness, and suspension travel.

Here is some data for the 3.4 DOHC:

Engine description: 3.4 Liter V6 (207 CID)
Engine Code: Multi-Port Fuel Injection RPO LQ1

General
Type & Description: 60 deg., V6, Front, Transverse, DOHC
Manufacturer: General Motors Powertrain Division
No. of cylinders: 6
Bore: 92.0mm (3.622 in.)
Stroke: 84.0mm (3.307 in.)
Bore spacing (C/L to C/L): 111.76mm (4.4 in.)
Cyl block matl & mass, machined): Cast Iron, 52.7 kg (116.2 lbs)
Cylinder block deck height: 224.0mm (8.82 in.)
Cylinder block length: 435.5mm (17.1 in.)
Deck clearance (minimum): 0.28 mm (.011 in), Above Block, Nominal
Cyl head material & mass: Aluminum, 7.7 kg (17.0 lbs)
Cylinder head volume: 52.8 cu. cm (3.2 cu. in)
Head gasket thickness (compressed): 1.6 mm (0.063 in)
Minimum combustion chamber total volume: 67.7 cu cm (4.13 cu in)
Cyl. no. system (front-to-rear): Left bank: 2-4-6, Right bank: 1-3-5
Firing order: 1-2-3-4-5-6
Upper Intake manifold material & mass: Aluminum Alloy, 7.9 kg (17.4 lbs)
Lower Intake manifold material & mass: Aluminum Alloy, 3.2 kg (7.1 lbs)
Rear Exhaust manifold material & mass: High Silicon Molybdenum Nodular Iron, Rear manifold: 4.0 kg (8.82 lbs), Front manifold: 2.8 kg (6.17 lbs)
Fuel antiknock index (R+M)/2: 87
Engine mounts: Quantity: 4, Material and type: 2x Elastomeric, 1x hydraulic, 1x torque strut, Added isolation: isolated sub-frame supporting the right & left hand mounts
Total dressed engine mass (wt), dry***: 204.35 kg (450.5 lbs) (Auto), 215.35 kg (474.7 lbs), Manual

Pistons
Material & mass - piston only: ALuminum Alloy, 414 g (14.6 oz)

Camshafts
Material & mass: Cast Iron, Left Bank Intake and Exhaust 4.54 kg (10.0 lbs), Right Bank Intake and Exhaust 4.31 kg (9.5 lbs)
Drive type: Chain & belt, width/pitch: Belt 34.0/9.53 mm (1.34/0.375in), Chain 17.5/9.53mm (0.689/0.375 in)

*** - including "all those items necessary to make the engine a complete ready-to-run unit"

Connecting Rods
Material & mass: Forged Steel, 0.592 kg, (1.3 lbs)
Length (axes centerline to centerline): 144.78mm (5.7 in)

Crankshaft
Material & mass: Nodular Cast Iron, 17.9 kg (39.4 lbs)
End thrust taken by bearing no 3

Lubrication System
Normal oil pressure @ rpm: 275 kPa (40 psi) @ 2000 RPM
Oil intake type: stationary
Oil filter system: Full Flow
Capacity of crankcase, less filter: 4.73 liters (5.0 quarts) with new filter, 4.26 liters (4.5 quarts) without changing filter

Cooling system
Circulation thermostat type: Bypass, starts to open @ 90 C (194 F)
Water pump type: Centrifugal
Water pump flow rate: 9.7 GPM @ 1000 RPM (pump speed)

Fuel System
Fuel injection system pressure: 300 kPa (43.5 psi)
Intake manifold heat control: Water
Fuel pump flow rate @ regulated pressure (wide open throttle): 62.4 L/hr @ 350 kPa (16.51 gal/hr @ 50.8 psi)

Clutch (Getrag 284)
Manufacturer: Daikin
Type: Dry, single disc, pull type clutch
Linkage: Hydraulic
Max pedal effort: Depressed 133.4 N (30.0 lbs), Released 133.4 N (30.0 lbs)
Assist: none
Pressure plate spring type: Diaphram
Total spring load (nominal): 7161 N (1610 lbs)
Clutch facing mfgr and material: Valeo F-202
Material and construction: Non-Asbestos
Rivets per facing: 16
Outside x inside dia (nom): 246 x 155 mm (9.69 x 6.10 in)
Total effectie area: 573 sq cm (88.85 sq in)
Thickness (pressure plate side/flywheel side): 3.5/3.2mm (.138/.126 in)
Rivert depth (pressure plate side/flywheel side): 1.6/1.5mm (0.063/0.059in)
Engagement cushion method: Cushion springs
Torsional damping method, springs, hysteresis: rubber springs single stage with non-metal friction control

[Series8217]

Using this datasheet we can compare the weight of the 3.4 DOHC (LQ1) to the aluminum-head 3.1 (LH0). The 3.1 didn't come with a manual on this car, so there is no weight information available for the flywheel. However, the flexplates will weigh about the same. The LH0 weighs 171.91 kg (379 lbs) fully dressed for an auto, according to the vehicle information file. The LQ1 weighs 450.5 lbs in the same configuration. That gives us a weight increase of 71.5 lbs for the 3.4 DOHC motor over the OHV aluminum-head 3.1.

What's heavier on the LQ1 that we can find on the spec sheet?

Upper + lower intake: +4.2 lbs
Heads: +10.6 lbs
Camshafts: +32.17 lbs
Exhaust: +0.9 lbs
Pistons: +1.8 lbs

Total: 49.67 lbs

That leaves 21.8 lbs of extra weight not listed on the data sheet. This must include the cam carriers (if they aren't listed with the "heads"), additional lifters, valves and valve springs, the timing belt, pulleys, and cogs, and the dogbone mount / engine lift mount (which weighs 5 to 10 lbs alone).

[draven]

excellent find, thanks!

[Series8217]

I weighed the 91-93 3.4 DOHC (LQ1) upper intake manifold with 20.0 pounds with the EGR valve installed. According to the specs I posted above, the upper intake manifold weighs 17.4 lbs. That puts the EGR valve at 2.6 lbs.

My shortened 91-93 intake (plenum removed and replaced with a pipe) weighed 9.38 lbs. It does not have EGR. The shortened intake is shown below: