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Mike E
Dodge Dakota
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3/16/2005
09:10:43
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 Subject: Stock 5.9L cam specs
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I'm looking for the stock cam specs for a 2000 Dakota R/T extended cab. I want to know so I know what measurments to get for a bigger cam. Thanks:)
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gen1dak
Dodge Dakota
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3/16/2005
19:39:02
| RE: Stock 5.9L cam specs
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See: http://dodgeram.org/tech/gas/specs/5_9v8.htm
Click "see table" for the actual valve timing.
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Bret
Dodge Dakota
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3/17/2005
12:42:00
| RE: Stock 5.9L cam specs
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I'm cam hunting myself, but the factory Magnum cam specs don't measure the intake/exhaust duration @ 0.50" lift which is the standard for cam manufacturers. Unless someone has actually used a degree wheel to measure it, I don't think we'll ever know. Two good sources for selecting a cam are Hughes Engines and KRC Performance. Hughes has a great detailed description on choosing a cam, although it may be skewed a little to their products.
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gen1dak
Dodge Dakota
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3/17/2005
21:35:23
| RE: Stock 5.9L cam specs
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@ .050 is in the 240 degree range. Pretty anemic.
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gen1dak
Dodge Dakota
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3/17/2005
21:37:20
| RE: Stock 5.9L cam specs
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Sorry, that's wrong. I musta had a stroke or something. It's more like the 180 degree range.
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matt
Dodge Dakota
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3/18/2005
23:02:22
| RE: Stock 5.9L cam specs
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"musta had a stroke"? thats friggin funny! either that or it could just be carbon monoxide poisoning... thats pretty common for techies and mechanics too... hehe... Jesus, I never knew the stock cam was so weak! 180? guess I just found my next project! thanks for the info..
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Mike E
Dodge Dakota
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3/21/2005
23:26:13
| RE: Stock 5.9L cam specs
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What exacally does the degree mean? 180 240? how does it change performance, lobe, idle (rough, smooth. What is a good cam that will give me great low end and a noticable idle. Thanks
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gen1dak
Dodge Dakota
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3/22/2005
00:34:53
| RE: Stock 5.9L cam specs
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The references to 180 and 240 refer to advertised duration and duration at .050" of lobe lift. The 240 would be the gross duration of valve lift in degrees of crankshaft rotation. It is generally accepted that duration, as measured at .050" cam lobe lift is a more accurate measure of net duration. Duration refers, basically, to how long the valves hand open. Overlap refers to the degrees of crankshaft rotation that both valves are open. Greater overlap moves the powerband up, and roughens idle. Lobe seperation refers to the degrees of seperation between the peak of the intake and exhaust lobes. Greater seperation, smooths the idle. 108 degree lobe sep. will roughen the idle (it naturally increases overlap by design), while something like 114 degrees will be silky smooth, all else being equal. It's all relative, mind you. You could have one honkin' wicked cam on a 114 degree lobe sep, and if the overlap is great enough, it'll lope like crazy. Likewise, a short duration cam on a 108 sep will be pretty smooth, even really smooth if the engine is large enough, but it'd probably still lope on a smaller engine. Different engines react differently to the same cam specs, so it'd help to know what engine you have, Mike E. However, generally, a cam with a 108-110 degree lobe sep, with duration at .050 around 210-220 degrees, and at least valve lift numbers in the mid-to-high 4's is a good place to start for your cam.
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