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Custom Dodge Ram Performance Mods - Engine - 6.4 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 6.4-liter HEMI® V8 engine - 410 horsepower, 429 lb-ft of torque.


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  #1  
Old 02-03-2014, 09:42 AM
Stampede4.7 Stampede4.7 is offline
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Default What is the difference between the Truck version...

and the SRT-8 Version?

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Old 02-03-2014, 11:27 AM
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From what I was told by a guy who works for Mopar, the two engines do not share many parts. The SRT8 is meant for fast high reving and max power output at high rpms and light weight internal parts to maximize HP to weight ratios. All things good for flogging laps around a race track.

The 6.4 for the truck was designed to be a truck engine. Heavy duty parts that will take a beating over time and that can handle the abuse of hauling, and off road use.
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  #3  
Old 02-03-2014, 02:19 PM
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From what I have read, the truck 6.4 is the same block as the SRT version [Engine bore x stroke: 103.9mm x 94.5mm (4.09" x 3.72")], and maybe the heads (not sure if they used the 5.7 Eagle or the 392/6.4 Apache heads). The intake manifold is the same active one the 5.7 uses; programming is setup for better torque with 10:1 compression to run on 89.
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Old 02-03-2014, 04:11 PM
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Default What is the difference between the Truck version...

The truck 6.4 uses regular 87 octane (per owners manual) while the SRT requires premium.
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Old 02-03-2014, 07:52 PM
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60+ HP difference..........
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Old 02-03-2014, 08:37 PM
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Quote:
Originally Posted by SRTian View Post
The truck 6.4 uses regular 87 octane (per owners manual) while the SRT requires premium.
I don't see how the 5.7 would have 89 recommended and the 6.4 wouldn't.
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Old 02-03-2014, 09:10 PM
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Quote:
Originally Posted by HemiLonestar View Post
I don't see how the 5.7 would have 89 recommended and the 6.4 wouldn't.
I would guess is it's all in the tuning... timing etc. The manual doesn't say anything about 89 being recommended.
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Old 02-04-2014, 12:27 AM
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i think the manual says for the hemi 89 recommended and 87 acceptable. Get the pdf here ( http://www.ramtrucks.com/en/owners/manuals/ ), page 581:

This engine is designed to meet all emissions
regulations and provide satisfactory
fuel economy and performance when using
high quality unleaded gasoline having
an octane range of 87 to 89. The manufacturer recommends
the use of 89 octane for optimum performance.
The use of premium gasoline is not recommended, as it
will not provide any benefit over regular gasoline in
these engines.
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Old 02-04-2014, 12:45 AM
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Quote:
Originally Posted by canadian.bacon View Post
i think the manual says for the hemi 89 recommended and 87 acceptable. Get the pdf here ( http://www.ramtrucks.com/en/owners/manuals/ ), page 581:

This engine is designed to meet all emissions
regulations and provide satisfactory
fuel economy and performance when using
high quality unleaded gasoline having
an octane range of 87 to 89. The manufacturer recommends
the use of 89 octane for optimum performance.
The use of premium gasoline is not recommended, as it
will not provide any benefit over regular gasoline in
these engines.
It's referring to the 5.7 hemi. The 3.6/6.4 shows 87 to be recommended. It's written the same in my hard copy owner's manual.
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  #10  
Old 02-04-2014, 08:10 AM
Stampede4.7 Stampede4.7 is offline
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I was thinking it was tuning and the cam. Can't wait to find out.

Thanks.
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