MP 392/6.4L Gen 3 Hemi Engine: NHRA Stock legal
#770769
08/10/10 05:59 PM
08/10/10 05:59 PM
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S.E. Michigan
ZIPPY
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Well this is interesting...the MP crew somehow managed to convince NHRA to make the 6.4L/392 Gen 3 HEMI engine legal for Stock Eliminator.
This is (roughly) the 6.1-based, 4.055 bore/3.795 stroke/6.2 rod/10.5:1 basic combination that Mopar Performance has sold as a crate engine since 2007.
Unlike the "normal" MP FI crate engine (which uses a stock intake), the NHRA legal version uses a drag pak single plane intake and 1000cfm throttle body....just like on the drag pak 6.1.
Major differences between the 6.4 and the drag pak 6.1 are minimal...It has a much lower compression ratio than the 6.1, the crank and pistons are different to achieve the displacement, and as far as I know that's about it.
It's starting out with an NHRA rating of 375 HP which seems fair, given the lower compression.
Spread the word to your class racin' friends. It seems to be a nice move towards embedding the Gen 3 Hemi that much deeper into the sport, and driving more development all the way around.
Rich H.
Esse Quam Videri
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Re: MP 392/6.4L Gen 3 Hemi Engine: NHRA Stock legal
[Re: ZIPPY]
#770770
08/10/10 07:25 PM
08/10/10 07:25 PM
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Florida
Locomotion
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But what bodies and model years would it be legal in? Original Drag Pack Challengers as an option to replace the 5.9 Magnum and 5.7 Hemi that were not carried over into the 2010 models?
Last edited by Locomotion; 08/10/10 07:28 PM.
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Re: MP 392/6.4L Gen 3 Hemi Engine: NHRA Stock legal
[Re: B1Fish540]
#770772
08/10/10 09:40 PM
08/10/10 09:40 PM
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Joined: Jan 2003
Posts: 3,505
DFW
mr_340
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It looks like the shipping weight got bumped up from 3100 pounds to 3200 pounds on the 2010 models. Were they having trouble making the shipping weight?
Floyd Lippencott IV
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Re: MP 392/6.4L Gen 3 Hemi Engine: NHRA Stock legal
[Re: HEMIFRED]
#770774
08/10/10 10:50 PM
08/10/10 10:50 PM
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Joined: Jan 2003
Posts: 17,926
S.E. Michigan
ZIPPY
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The MP drag pak 6.1 (but not the OE engine) is 12:1, the 392 drag pak is 10.5:1 (I don't know what the OE engine will be yet, but I've noticed the OE 6.4 is just starting to show up as an engine option in Star Parts, so it probably won't be long)......that's where the rating came from.
That's some really redundant, horrible sentence structure there....just trying to differentiate the Mopar Performance Drag Pak engine combo from the OE production one.
As to which one is hotter...it should be interesting to see which one really performs better over time: 370ci/12:1, or 392/10.5:1.......for now the low compression motor is starting out with less but time will tell.
I'm not 100% sure what chassis it is supposed to be legal for....As soon as I understand the whole picture better I'll post about it.
Rich H.
Esse Quam Videri
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Re: MP 392/6.4L Gen 3 Hemi Engine: NHRA Stock legal
[Re: ZIPPY]
#770775
08/11/10 02:05 AM
08/11/10 02:05 AM
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Joined: Jan 2003
Posts: 3,505
DFW
mr_340
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The 6.4L is listed in the 2010 Dodge Classification Guide, but not in the 2009 Dodge. See attachment.
Floyd Lippencott IV
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Re: MP 392/6.4L Gen 3 Hemi Engine: NHRA Stock legal
[Re: sst404b]
#770777
08/11/10 03:38 PM
08/11/10 03:38 PM
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Joined: Jan 2003
Posts: 17,926
S.E. Michigan
ZIPPY
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For the best price, at some point there is supposed to be to be a 6.4 kit to put into a 6.1 block. That way a guy can use what he already has.
For now the lowest priced way to do it with new parts, and not using an existing engine.... is to buy a whole stock 6.1 for 6250, sell everythig not needed for maybe 1000 or so, then build it back up with the nhra accepted 6.4 pieces.
Rich H.
Esse Quam Videri
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Re: MP 392/6.4L Gen 3 Hemi Engine: NHRA Stock legal
[Re: cudadoug]
#770781
08/12/10 11:17 AM
08/12/10 11:17 AM
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Joined: Jan 2003
Posts: 269
Kansas wishing I was in Ohio
SeanD
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It looks like the shipping weight got bumped up from 3100 pounds to 3200 pounds on the 2010 models. Were they having trouble making the shipping weight?
I think I heard since many of them came out capable of qualifying #1 on the first time some hit the track that was an NHRA move. 
The 5.7 and 6.1 have both gotten horsepower already. That happens when they are factored soft to begin with and racers don't guard the combo. 
I'm as Mopar as the next guy, but these "package cars" in STOCK are sooooo BOGUS! 
Wonder how much it cost Mopar to buy this decision from NHRA?? Guess since GM wasn't around to fight it...maybe it was an easy sell.
These cars need to be factored into SUPER Stock where they belong. Otherwise in Stock, it should be with a "regular" Chally. Just like everyone else has had to deal with since time began.
At least limit the accepted motor what is available on the dealers floor and put the 6.4 and 5.9 Mag in a SS/GT class...with the RIGHT factor.
Personally, I am not concerned AT ALL about these "package cars". Brand "X" gets enough rules allowance that it is about time Ma got a make-up call from the officials.
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