Cubic inches- vs- Boost?
#903765
01/13/11 05:27 PM
01/13/11 05:27 PM
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Joined: Jan 2003
Posts: 3,831
N.E. Ohio
6bblFLASH
OP
master
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OP
master
Joined: Jan 2003
Posts: 3,831
N.E. Ohio
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Power and driveability wise what would be more feasable? I have a 383 in the car now and am putting a B&M 174 Supercharger on it. But it has 9.25 comp. in it now w/KB pistons. 9.25 is too much so short of cutting on the pistons,OR custom pistons I may end up with a decision.  However I have TEN 440`s and a couple would only need freshened to be ready for what I want to do and they would already be low-comp, and also the piston choices for 440`s are many.  440 with say 5--6lbs. boost OR 383 with 8--10lbs. of boost? What would make more power all else being equal? 
70` Cuda`,440 6BBL Jerico,Dana 4.56 Still on 93 Pump Gas
9.87 @ 136/1.31-60ft.`09 Mopar Nationals PASSON PERFORMANCE "Stick-Shift" Champ!
2013 StickShift Challenge Winner@ Mopar Nationals!
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Re: Cubic inches- vs- Boost?
[Re: TheOtherDodge]
#903767
01/13/11 07:47 PM
01/13/11 07:47 PM
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Joined: Jul 2010
Posts: 1,845
Tampa
DusterDave
top fuel
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top fuel
Joined: Jul 2010
Posts: 1,845
Tampa
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I'd go with the 440 with 5 lbs. boost. But, you'll have to get a different blower manifold for the 440.
Gone to the dark side with an LS3 powered '57 Chevy 210
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Re: Cubic inches- vs- Boost?
[Re: 6bblFLASH]
#903769
01/13/11 09:05 PM
01/13/11 09:05 PM
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
blownzoom440
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Joined: Jul 2005
Posts: 8,647
ELYRIA,OH
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Quote:
Quote:
I'd go with the 440 with 5 lbs. boost. But, you'll have to get a different blower manifold for the 440.
I have both B and RB intakes for the blower.
I "assumed" more cubes would work as well but, was throwing it out there for those with more experience on this stuff  
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Re: Cubic inches- vs- Boost?
[Re: blownzoom440]
#903770
01/13/11 11:12 PM
01/13/11 11:12 PM
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Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
DaytonaTurbo
Too Many Posts
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Too Many Posts
Joined: Feb 2003
Posts: 21,318
Manitoba, Canada
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That's a bit small of a blower for a 440. It's displacement would be better suited for a 383. IIRC, a blower like that, pushed to its limit would only be able to make 5 or so pounds of boost on a 440. Really if all things were equal between the two, so same supercharger gearing ratios, same heads, cam, exhaust, etc I bet they would both perform similarly on the 1/4 mile.
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Re: Cubic inches- vs- Boost?
[Re: Sport440]
#903772
01/14/11 01:34 PM
01/14/11 01:34 PM
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Joined: Nov 2006
Posts: 2,255
IL
furious70
top fuel
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top fuel
Joined: Nov 2006
Posts: 2,255
IL
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Did you buy the setup on here out of Chicago?
70 Sport Fury
68 Charger
69 Coronet
72 RR
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Re: Cubic inches- vs- Boost?
[Re: Sport440]
#903773
01/14/11 02:54 PM
01/14/11 02:54 PM
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Joined: Jan 2003
Posts: 24,562
Brookeville, Md
Mr.Yuck
Not enough dumb comments...yet
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Not enough dumb comments...yet
Joined: Jan 2003
Posts: 24,562
Brookeville, Md
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Quote:
Both engines would have great driveability.
Hands down I would pick the bigger 440 motor. Less Boost = less Problems.
But the 383 with double the boost would make even more power then the 440 at half the boost.IMO mike
I don't know if the 383 could make double the boost w/ that small blower. Boost is really just a measure of resistance. It's more about getting the air/fuel into the chamber. For example a stockish 440 w/ unported heads, exhaust manis and 2.5 exhuast might show 6psi of boost, however a ported aluminum headed 440, w/ RPM intake, big tube headers and nice 3" exhaust would show 3-4. Same amount of air is being pushed by the same unit, however the stockish 440 is more restrictive.
That small 174 unit could feed a mild 440. FWIW my old stockish 440 ran 12.90 before boost and 12.0 after about 5.5lbs of boost. I'd think that a mild 440 w/ 5psi of boost would out perform a mild 383 w/ 8lbs.
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