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Discussion Starter #1
If I'm not mistaken, but isn't the 6.1L SRT8 engine 370 ci?

And, even though Chrysler is trying to market the 6.4L SRT8 engine as a "392", isn't it really 391 ci?

I'm just saying...
 

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5.7l = 347.8353 ci
6.1l = 372.2448 ci
6.4l = 390.552 ci
6.425l = 392.07 ci
6.982l = 426.06 ci
 

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5.7l = 347.8353 ci
6.1l = 372.2448 ci
6.4l = 390.552 ci
6.425l = 392.07 ci
6.982l = 426.06 ci
Don't convert liters to cu. in. In doing so you're assuming that the 5.7L (for example) is exactly 5.7L. It's not.

5.7L HEMI actually = 345 cu. in.
6.1L HEMI actually = 370 cu. in.
6.4L HEMI actually = 391 cu. in.

For the record, I'm fine with Mopar calling the 6.4 a 392 for heritage reasons. It's less than 1 cu. in. short however. Hey, if Ford could call their 302 a 5.0L for all these years (when in reality it is 3 cu. in. short of 5.0L) I won't quibble about less than 1 cu. in.
 

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That's my point.... So, close counts in car engine displacement.
 

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So where is the 6.4L engine documented as a 391?
I have only seen it written as 392, for example...

6.4

Chrysler displayed a larger 6.4 L (392 cu in) Hemi in 2005 with output 525 horsepower (391 kW) and 510 lb·ft (691 N·m) torque. It is based on an iron HEMI 6.1 L engine block with aluminium alloy pistons.[6] In late 2009 Chrysler Group LLC announced that the 6.4 Hemi would be available in the next generation SRT 8 Dodge Charger, Chrysler 300c and Jeep Grand Cherokee.[citation needed]
The production version of the 6.4L Hemi will first debut in the 2011 Dodge Challenger SRT8 and it will utilize Variable Camshaft Timing as well as MDS in automatic equipped cars and non-MDS in 6-speed manual cars. Although 2011 Dodge Challenger has not debuted yet, specification of 2011 Dodge Challenger leaked to public. The SRT8 version will have 392 HEMI (6.4L) engine rated at 475 hp (354 kW) and 460 lb·ft (624 N·m).[7]
The engine will then be used in the Dodge Challenger SRT8, Chrysler 300SRT8 and the Jeep Grand Cherokee SRT8.

A crate engine version was sold under the name '392 Hemi Crate Engine'.



OR


The 6.4 Hemi (392 Hemi) is to be in the 2011 Dodge Challenger SRT8 and other SRT V8 models. The engine is very different from the one in the Challenger Drag Pack (the Mopar crate engine), not just because it has multiple displacement (four cylinders automatically shut off when not needed to dramatically increase gas mileage). The engines have a different bore, stroke, cam, heads, compression, and intake.

oh2o told Allpar readers about the engine in 2005, with horsepower estimated between 450 and 500; in 2008 we firmed our estimate at 480, and in 2010 it was launched with 475 horsepower and 460 lb-ft of torque (on Challenger; on the 2012 Charger SRT8, it was 465 hp and 465 lb-ft). To limit emissions, both spark plugs were used at top dead center and one was used before top dead center to burn off the hydrocarbons, allowing the use of less restrictive catalytic converters. The engine reportedly (“carcharger”) cannot pass durability testing at 525 horsepower, due to piston skirt issues when tested near overheat conditions. (Durability testing reportedly requires 200,000 miles MTBF and extensive testing under extreme conditions.)
The 392 Hemi (6.4 liter) will not have MDS (four cylinder mode) when paired with a manual transmission.


Or


Will the 2011 Dodge Challenger SRT8 Be Available With the 6.4L HEMI V8?


0


It has been reported for some time that the current 6.1L HEMI V8 would need to be replaced at some point in Dodge performance vehicles. While the 6.1L is a very capable engine with good horsepower and torque characteristics, the landscape in the world of modern muscle cars is evolving and Dodge must evolve with it. With the competition stepping up their horsepower figures to increase sales and rule the streets, Dodge must keep pace or be left behind.
What most are speculating will be the replacement for the current 6.1L will be the new 6.4L HEMI (aka 392 cubic inch HEMI). Current theory is that it is slated for launch on the 2011 Dodge Challenger SRT8 in November 2010. No horsepower figures have been released yet for the production version, but the current 6.4L HEMI V8 crate motor available from Mopar Performance generates a solid 525 bhp and 510 ft-lbs. of torque so that should give us a good idea of what this new power plant is capable of right out of the box.
 

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So where is the 6.4L engine documented as a 391?
I have only seen it written as 392, for example...
Here's some info:
Car and Driver

Okay, math whizzes, it actually works out to 391.15 cubic inches, but that’s close enough for Chrysler to roll out the marketing war wagons.
2011 Dodge Challenger SRT8 392 First Drive: Dodge Challenger Review

If you do the displacement formula math:

4.09 x 4.09 x 3.72 x .7853982 x 8 which is interesting because that ends up being 390.9934161715392


I'm not sure where C/D got their math from but I think it might be broken. :)
 

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Thanks! I hadn't seen that one yet.
Sure. :) One way or another it's being rounded up to 392. It's just a matter of how much. :scratchhead:
 

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Sure. :) One way or another it's being rounded up to 392. It's just a matter of how much. :scratchhead:
It's being called "392" for marketing reasons. (To play off the original 392 Hemis) ---- I have a clip or magazine article that discusses this. I'll have to find it.

So... Bottom line. Should the 6.1L SRT8 subfolder be correctly titled "6.1L / 372 ci (2008 - 2010)" or "6.1L / 370 ci (2008 - 2010)"?

Also, none of the new SRT8 sub-folders show in the "Active Topics" area. Can I "MOD" fix this?
 

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It's being called "392" for marketing reasons. (To play off the original 392 Hemis) ---- I have a clip or magazine article that discusses this. I'll have to find it.

So... Bottom line. Should the 6.1L SRT8 subfolder be correctly titled "6.1L / 372 ci (2008 - 2010)" or "6.1L / 370 ci (2008 - 2010)"?

Also, none of the new SRT8 sub-folders show in the "Active Topics" area. Can I "MOD" fix this?
According to his wikipedia link:

The Hemi is also available in a 6,059 cc (6.059 L; 369.7 cu in) version. .
Chrysler Hemi engine - Wikipedia, the free encyclopedia


Doing the math:
4.05 * 4.05 * 3.58 * 0.7853982 * 8 = 368.95462745832
 
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