I asked:
Good morning, I've got two questions regarding my '07 Charger with the
3.5l V6. First, I know that this engine went through a revision in '97 where
it went from Iron to Aluminum, non-interference to interference, etc. I've
not been able to find what kind of cams this engine uses. Does it have
roller cams or is it flat tappet?
Secondly, regarding the oil viscosity requirement. The Chrysler 3.5l V6 and 4.0 I6 are the only two motors (in the Chrysler lineup) to specify that 10w30 was the preferred oil weight. This is a fairly unusual viscosity recommendation, especially for a
vehicle made in the 2000s. Why is it that Chrysler hung onto this oil recommendation for so long, especially when the rest of the fleet was making a switch from 5w30 to 5w20?
Thank you.
Their answer:
The 3.5 Liter (214 Cubic Inches) 60°V-6 engine is a single overhead
camshaft design with hydraulic lifters and four valves per cylinder. As
you mentioned, the engine does not have provisions for a free wheeling
valve train.
The aluminum alloy cylinder heads feature cross-flow type intake and
exhaust ports. Valve guides and seat inserts are powdered metal. Valves
are arranged in a ?V?, with each camshaft on center. To improve
combustion speed the chambers are a compact spherical design with a
squish area of approximately 30 percent of the piston top area. The
cylinder heads are common to either cylinder bank by reversing the
direction of installation.
Rocker arms are made of light weight permanent mold aluminum alloy with
a roller type follower operating against the camshaft . The valve
actuating end of the rocker arms are machined to retain hydraulic lash
adjusters, eliminating the need for manual valve lash adjustment.
A single overhead camshaft per cylinder head provides valve actuation.
The left camshaft accommodates a cam sensor pick-up wheel and is
therefore longer. Each camshaft is supported by four bearing journals. A
thrust plate attached to the rear of each cylinder head controls
camshaft end play. Right and left camshaft driving sprockets support a
timing mark, are keyed, and not interchangeable because of the cam
sensor pick-up wheel on the left sprocket. Camshaft bearing lubrication
is provided via a oil supply passage through each rocker shaft pedestal
dowel.
The camshaft is driven by the crankshaft via drive sprockets and belt.
The camshaft has precisely machined lobes to provide accurate valve
timing and duration.
SAE 10W-30 engine oil is recommended for the 3.5L engines, for
temperatures above ?18°C (0° F). SAE 5W-30 engine oil is recommended for
the 2.7L and 3.5L engine, for operating temperatures below ?18°C (0° F).
These engine oils improve low temperature starting and vehicle fuel
economy.
So they answered my cam question with great detail. The oil, not so much. The mystery still remains...
Good morning, I've got two questions regarding my '07 Charger with the
3.5l V6. First, I know that this engine went through a revision in '97 where
it went from Iron to Aluminum, non-interference to interference, etc. I've
not been able to find what kind of cams this engine uses. Does it have
roller cams or is it flat tappet?
Secondly, regarding the oil viscosity requirement. The Chrysler 3.5l V6 and 4.0 I6 are the only two motors (in the Chrysler lineup) to specify that 10w30 was the preferred oil weight. This is a fairly unusual viscosity recommendation, especially for a
vehicle made in the 2000s. Why is it that Chrysler hung onto this oil recommendation for so long, especially when the rest of the fleet was making a switch from 5w30 to 5w20?
Thank you.
Their answer:
The 3.5 Liter (214 Cubic Inches) 60°V-6 engine is a single overhead
camshaft design with hydraulic lifters and four valves per cylinder. As
you mentioned, the engine does not have provisions for a free wheeling
valve train.
The aluminum alloy cylinder heads feature cross-flow type intake and
exhaust ports. Valve guides and seat inserts are powdered metal. Valves
are arranged in a ?V?, with each camshaft on center. To improve
combustion speed the chambers are a compact spherical design with a
squish area of approximately 30 percent of the piston top area. The
cylinder heads are common to either cylinder bank by reversing the
direction of installation.
Rocker arms are made of light weight permanent mold aluminum alloy with
a roller type follower operating against the camshaft . The valve
actuating end of the rocker arms are machined to retain hydraulic lash
adjusters, eliminating the need for manual valve lash adjustment.
A single overhead camshaft per cylinder head provides valve actuation.
The left camshaft accommodates a cam sensor pick-up wheel and is
therefore longer. Each camshaft is supported by four bearing journals. A
thrust plate attached to the rear of each cylinder head controls
camshaft end play. Right and left camshaft driving sprockets support a
timing mark, are keyed, and not interchangeable because of the cam
sensor pick-up wheel on the left sprocket. Camshaft bearing lubrication
is provided via a oil supply passage through each rocker shaft pedestal
dowel.
The camshaft is driven by the crankshaft via drive sprockets and belt.
The camshaft has precisely machined lobes to provide accurate valve
timing and duration.
SAE 10W-30 engine oil is recommended for the 3.5L engines, for
temperatures above ?18°C (0° F). SAE 5W-30 engine oil is recommended for
the 2.7L and 3.5L engine, for operating temperatures below ?18°C (0° F).
These engine oils improve low temperature starting and vehicle fuel
economy.
So they answered my cam question with great detail. The oil, not so much. The mystery still remains...