6.4L engine questions? - Cherokee SRT8 Forum
WK2 SRT8 Engine Performance/Superchargers/Turbos/Nitrous Discuss engine performance enhancing modifications, superchargers & turbo applications specific to the WK2 SRT8 here.

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post #1 of 13 (permalink) Old 06-30-2012, 03:09 PM Thread Starter
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6.4L engine questions?

anyone know if the 6.4L has any forged internals, crank rods or pistons?
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post #2 of 13 (permalink) Old 11-21-2012, 05:00 AM
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I believe i read the other day that the crank is forged but it did not mention anything about the rods... sorry

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post #3 of 13 (permalink) Old 11-21-2012, 07:32 AM
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Quote:
Originally Posted by MTGOAT View Post
I believe i read the other day that the crank is forged but it did not mention anything about the rods... sorry
I found this hope it helps.

Specifications:
• Deep-Skirted Cast Iron Block with Cross-Bolted Mains
• CNC Ported Aluminum Twin-Plug Cylinder Heads
• Stainless Steel 2.100" Intake and 1.600" Exhaust Valves
• Ovate Wire (Beehive) Competition Valve Springs
• Viton Competition Valve Stem Seals
• 279°/285° (duration @ .006") Hydraulic Roller Camshaft with 0.584" Intake and 0.552” Exhaust Lift
• Forged Pistons (4.055" Bore)
• 10.9:1 Compression Ratio
• 4140 Forged Steel Crankshaft – 3.795" Stroke
• 4130 Forged Steel I-Beam Performance Connecting Rods – 6.200" Length
• Premium Tri-Metal Performance Engine Bearings
• Precision Balanced Rotating Assembly
• Distributorless Coil-On-Plug (COP) Ignition System

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Last edited by jim383; 11-21-2012 at 10:21 AM.
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post #4 of 13 (permalink) Old 11-21-2012, 08:01 AM
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Quote:
Originally Posted by jim383 View Post
I found this hope it helps.

Specifications:
• Deep-Skirted Cast Iron Block with Cross-Bolted Mains
• CNC Ported Aluminum Twin-Plug Cylinder Heads
• Stainless Steel 2.100" Intake and 1.600" Exhaust Valves
• Ovate Wire (Beehive) Competition Valve Springs
• Viton Competition Valve Stem Seals
• 279°/285° (duration @ .006") Hydraulic Roller Camshaft with 0.584" Intake and 0.552” Exhaust Lift
• Forged Pistons (4.055" Bore)
• 10.3:1 Compression Ratio
• 4140 Forged Steel Crankshaft – 3.795" Stroke
• 4130 Forged Steel I-Beam Performance Connecting Rods – 6.200" Length
• Premium Tri-Metal Performance Engine Bearings
• Precision Balanced Rotating Assembly
• Distributorless Coil-On-Plug (COP) Ignition System
Nice!

I was listening to a review on the motor the other day as well and I could have sworn that the SRT tech said the 6.4L had a 10.9:1 compression 10.3:1 is still pretty stout to say the least. Great motor!
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post #5 of 13 (permalink) Old 11-21-2012, 08:03 AM
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Originally Posted by MTGOAT View Post
Nice!

I was listening to a review on the motor the other day as well and I could have sworn that the SRT tech said the 6.4L had a 10.9:1 compression 10.3:1 is still pretty stout to say the least. Great motor!
I just looked on like and it says that the 392 does have a 10.9:1 compression ratio.


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post #6 of 13 (permalink) Old 11-21-2012, 08:09 AM
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Quote:
Originally Posted by jim383 View Post
I found this hope it helps.

Specifications:
• Deep-Skirted Cast Iron Block with Cross-Bolted Mains
• CNC Ported Aluminum Twin-Plug Cylinder Heads
• Stainless Steel 2.100" Intake and 1.600" Exhaust Valves
• Ovate Wire (Beehive) Competition Valve Springs
• Viton Competition Valve Stem Seals
• 279°/285° (duration @ .006") Hydraulic Roller Camshaft with 0.584" Intake and 0.552” Exhaust Lift
• Forged Pistons (4.055" Bore)
• 10.3:1 Compression Ratio
• 4140 Forged Steel Crankshaft – 3.795" Stroke
• 4130 Forged Steel I-Beam Performance Connecting Rods – 6.200" Length
• Premium Tri-Metal Performance Engine Bearings
• Precision Balanced Rotating Assembly
• Distributorless Coil-On-Plug (COP) Ignition System
Hey Jimbo, not sure that's the production model 6.4 motor being used today in the WK2 and the LX vehicles...that's the specs from one of the engines I have listed up for sale, the Mopar Performance Crate 392

http://www.cherokeesrt8.com/forums/s...ad.php?t=66637

I doubt that the Mopar Performance crate setup would be the same specs of the production model...

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post #7 of 13 (permalink) Old 11-21-2012, 08:10 AM
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Quote:
Originally Posted by barish93 View Post
I just looked on like and it says that the 392 does have a 10.9:1 compression ratio.


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interesting... and ridiculous!
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post #8 of 13 (permalink) Old 11-21-2012, 08:24 AM
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Lol skip
Yea those specs didn't make sense for the oem motor. If they did I'd be half way to the dealer with second stop being the "turbo guy"


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post #9 of 13 (permalink) Old 11-21-2012, 08:30 AM
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You and me both! That's what all the Boss owners are doing haha, factory forged beasts ready for 20 psi out the box!
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post #10 of 13 (permalink) Old 11-21-2012, 10:23 AM
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It didnt say if it was a crate motor or production motor, and yes the compression is 10.9-1 from what i have seen.
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