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TimG
Dodge Dakota
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1/31/2006
12:51:26
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 Subject: Cylinder head CC
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Anybody know what the c.c.'s are on a stock 97 3.9 cylinder head ??
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I
Dodge Dakota
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1/31/2006
13:30:31
|  RE: Cylinder head CC
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The first fuel-injected 3.9s were rated at 125. The Magnum versions, with multiple-port injection, were rated at 180 hp. Torque jumped from 195 to 220 lb-ft as well. Gas mileage was roughly 2 mpg better than the similarly set up 318.
In 1994, the exhaust manifolds were shrunk to 1 5/8" and the exhaust was reduced to 2.5" from 3", eliminating 5 horsepower but no doubt saving some money. In 1996, EGR was eliminated.
In 1997, the 3.9 received sequential multiple-port fuel injection, where each injector fires as you'd normally expect anyway - as the cylinder is drawing in air (in standard multiple-port injection, the injector often fires against a closed valve). That and a larger spark plug gap helped to increase responsiveness, though horsepower and torque ratings remained the same as in 1996 - at 175 hp @ 4,800 rpm and 225 lb-feet of torque @ 3,200 rpm. At the time, the 318 was producing 230 hp @ 4,400 and 300 lb-ft @ 3,200.
Description 90 degree V6
Displacement 239 cubic inches / 3906 cc
Bore and stroke 3.91 x 3.31
Valves Overhead - 12 valves, roller followers, hydraulic lifters
Fuel injection 1987: None, Holley carburetor
1988-1991: Single-point electronic
1992-1996: Multiple-point
1997-end: Sequential, returnless multiple-point
(returnless means only one fuel line, going in)
Construction Cast iron block and heads
Compression ratio 9.1:1 in 1997
Redline 5,250 rpm
Fuel 87 octane unleaded regular
Oil, coolant 4 quarts oil, 14 quarts coolant
Emissions 3-way catalyst, two heated oxygen sensors
EPA mileage
(1997 Dakota) 16 city, 22 highway (2WD, manual transmission)
15 city, 18 highway (4WD, automatic transmission)
(Click here for repair tips | click
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TimG
Dodge Dakota
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1/31/2006
19:55:39
| RE: Cylinder head CC
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Message:
Thanks, but I'm looking for the c.c's of just the combustion chamber of the head only, not the c.cs of the entire engine. any body know ?
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Trevor
Dodge Dakota
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1/31/2006
20:29:56
| RE: Cylinder head CC
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Are these 3.9s are big blocks? 'I' said "Description 90 degree V6"
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?
Dodge Dakota
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2/01/2006
08:34:10
| RE: Cylinder head CC
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Message:
By doing the math
head only = approx 4 cubic inch or 71 cc
divide total by 6 ( # of cyl )
divide result by compression ratio =
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???
Dodge Dakota
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2/01/2006
10:11:24
| RE: Cylinder head CC
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Is a stock block zero decked? Cause that's the only way that formula works.
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TimG
Dodge Dakota
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2/01/2006
10:57:25
| RE: Cylinder head CC
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Message:
Yes thats at zero deck, thanks guys
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cant post
Dodge Dakota
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2/05/2006
02:19:35
| RE: Cylinder head CC
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58cc
Larry
J&J Auto
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