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  #1  
Old 08-13-2004, 03:35 PM
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The 425HP 6.1 HEMI is due out next spring!

Wonder if it'll go in a truck. Right now it is slated for a NEW 300C version call the SRT-8. I love that 300C...I'll have to wait for this 425hp version.

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The 425-horsepower, normally aspirated 6.1-liter HEMI is the highest specific-output engine ever offered by the Chrysler Group. Its 69.8 horsepower-per-liter rating exceeds even that of the legendary 1966 "Street HEMI." Torque is rated at 420 lb.-ft.

Although the Chrysler HEMI was born in the 1950s and entered into legend in the 1960s and '70s, today's version took much of its inspiration from the original - particularly the namesake hemispherical combustion chambers that provide power and efficiency.

When SRT set out to develop a more powerful HEMI for the Chrysler 300C SRT-8, they were mindful of the engine's heritage, which led to adopting traditional HEMI engine cues, such as an orange-painted cylinder block and black valve covers.

The SRT powertrain engineers who developed the Chrysler 300C SRT-8's engine achieved more horsepower by adding more cubic inches, increasing the compression ratio, redesigning the cylinder head intake and exhaust systems for increased flow, and increasing engine speed.

To get more displacement, SRT engineers bored out the diameter of the cylinders in the Chrysler 300C SRT-8's HEMI by 3.5 millimeters each, to increase the total displacement to 6.1 liters from 5.7 liters. Compression ratio was also increased to 10.3:1 from 9.6:1, unleashing more energy in the combustion process.

Engine breathing was increased with new high-flow cylinder heads, a specially designed intake manifold, and exhaust "headers" with individual tubes encased in a stainless steel shell, all unique to the 2005 Chrysler 300C SRT-8's 6.1-liter HEMI engine. Larger diameter valves and reshaped cylinder ports in the heads allow for maximized air flow. The intake manifold was designed with larger diameter runners for higher-speed tuning. Exhaust is routed through a larger-diameter (2.75-inch vs. 2.5-inch) exhaust system with 3.5-inch chrome tips.

Performance-oriented camshaft profiles were developed to balance total vehicle requirements, simultaneously allowing more air in and out of cylinders. This increases performance and manages a higher engine speed, which is another method to increase horsepower. SRT engineers increased the HEMI's peak engine speed nearly 15 percent, to 6,200 revolutions power minute (rpm) from 5,400 rpm. Intake and exhaust valve stems are hollow, and the exhaust valve stems are filled with sodium to help dissipate heat more efficiently.

The high-performance 6.1-liter HEMI is further strengthened with a host of redesigned components, including a reinforced engine block with increased coolant flow, forged steel crankshaft, high-strength powdered-metal connecting rods, floating-pin pistons (cooled by oil squirters), and an oil pan modified for reduced oil foaming.
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Old 08-13-2004, 05:18 PM
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Its still got 1 major flaw... It's a Dodge!
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Old 08-13-2004, 05:27 PM
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LOL.

I posted this because I think it is interesting to most of us in what is happening to the large displacement (at least to the manufacturers) gas engine segments.

425HP is a lot of HP!
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Old 08-13-2004, 05:30 PM
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Is it overhead cam or pushrod?
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Old 08-13-2004, 05:35 PM
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There is a thread about this in the Ford vs. Comp section with a link that says the engine is limited to the SRT models.
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Old 08-14-2004, 12:20 AM
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Here's a link to the other thread. In one post there is a link to the specs of this motor. It's a high winder. It's 425 HP comes at 6200 RPM and it's 420 ft-lbs are at 4800 RPM, and it requires premium gas. Same stroke as the 5.7 Hemi, bigger bore.
http://www.ford-trucks.com/forums/sh...d.php?t=271122
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Old 08-14-2004, 01:24 AM
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Quote:
Originally Posted by Monsta
425HP is a lot of HP!
That is alot of horsepower! In fact, I think it's over kill. Just imagine what kind of mileage the engine would get if stuffed it in the ram!
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Old 08-14-2004, 09:40 PM
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That sounds great but I hope they farm out the Tranny!! I drive dodges for company cars and have had several transmissions replaced. That much HP is going to be a real test! I couldnt even keep the tranny in my Dakota RT.
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Old 08-14-2004, 10:38 PM
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Quote:
Originally Posted by Toreador_Diesel
Just imagine what kind of mileage the engine would get if stuffed it in the ram!
Supposedly 15% more with the MDS system.
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Old 08-15-2004, 07:08 PM
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I just read a test of the Dodge Magnum with the Humy sorry Shimy dang Hemi and in a car with a 5 speed auto and cylinder deactivation it got like 15 MPG. That thing must such in a truck and this HO motor will be even worse.
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Old 08-16-2004, 10:40 AM
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Quote:
Originally Posted by Monsta
Supposedly 15% more with the MDS system.
Well I suppose so, but this is one of those "wait and see" sort of things.
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Old 08-16-2004, 11:04 AM
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I think the engine looks good, but it's yet to be seen in a truck. It will prabably cost an arm and a leg, and with the engine that beefed up, it will probably leave little to no room for performance mods. I agree that the tranny will be the deciding factor for that drive train. After all who wants 400+ hp and 400+ lb/ft torque if you can't put it to the ground nevertheless interesting
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Old 08-19-2004, 07:52 PM
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just wait till ford comes out with its 6.2L engine that is supposed to blow away everything else on the market
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Old 10-09-2004, 11:06 PM
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Anything new develop with the 6.1 liter Hemi?
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Old 10-09-2004, 11:41 PM
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Quote:
Originally Posted by DJR 17
Its still got 1 major flaw... It's a Dodge!
AMEN!..............hmmm although 425HP would be nice under the hood of an f250...okay i need a big shoe horn+misc.tools+a few know-it-all friends= HEMI Ford!
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Old 10-09-2004, 11:41 PM
 
 
 
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