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Mopar Event Specialist
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The following message was cross-posted on the .Org tech page, but I doubt many of the people who are following the launch of the SRT-4 pay much attention to that forum.

As I understand, most 2.4 swaps use a dohc 2.0 head and manifolds. Does anyone have any idea yet (I know it's a little early to be asking) if the 2.4 head that will be used on the SRT-4 is different?

The reason I ask is oiling system related. The 2.0 head tends to gather and hold oil when it is turbocharged and used with a lot of lateral g-force, like on a National level autox course or a road course with a long carousel type turn. The oil gathers outboard of the oil return galleys and eventully pumps out of the breather on the back of the valve cover. More than a couple turbo 2.0 engines have lost rod bearings this way.

I have a hard time believing that D-C would release a car with a powertrain warranty that would be used after every skidpad session with R tires, but I've seen no mention of a block and head configuration unique from the existing 2.4 hardware.

The only roadcourse testing I've read about is on the "Streets of Willow" by Grassroots Motorsports. Willow Springs is a low speed track with a lot of transients, but nothing like the outer loop at Watkins Glen or any of the NASCAR turns (usually entered from a low speed off the infield) at the super-speedways like MIS, PPIR, or TWS.

Your thoughts are greatly appreciated,
Dale
 

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Premium Member
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5,578 Posts
this is the only info i have about the head/block. go here for info about the rest of the car too.

http://www.allpar.com/mopar/24.html

"Heads

The cylinder head is a low profile aluminum casting with pent-roof combustion chambers that house four valves per cylinder. The valve included angle is 48 degrees, allowing large valves.

Dual camshafts run in six bearings with removable caps that are machined in the head base material. Powdered metal valve seat inserts and valve guides are pressed into the head. Spark plugs thread into the center of the combustion chamber through wells cast into the head.

Ports from each valve merge in the head, leading to a single branch (runner) in their respective manifolds. To provide turbulence in the cylinders that contributes to the rapid combustion necessary for low emissions and efficient operation on regular-grade gasoline, the ports cause incoming air to "tumble" from top to bottom of the cylinders. The degree of tumbling action was balance against the conflicting need for high air flow to obtain high power output.

Made of die cast aluminum, the cylinder head cover features an isolated mounting with an O-ring type, silicone perimeter gasket. The DIS coil- mount is built into the cover. The PCV system is also integral with the cylinder head cover."
 

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http://www.bstockum.com/turboblock.html

This is a PT Turbo engine which should be mechanically the same as the SRT-4 engine. From what it looks like they added a few extra things into the block casting.
 
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