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Rubber Mount Sportster Motorcycle Talk (2004-2006) This area is to discuss issues, problems and anything else unique to the 2004 and above Sportster motorcycles

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  #1  
Old 3 Weeks Ago
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Default Cams, what are the specs?

I have a stock 2004 883c and am converting it to a 1200.

Question: From the factory, do both the 883 and the 1200 use the same cams?


Are they W's or are they D's?


Does anyone have the specs?

I have found conflicting numbers and specs.
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2004 883 cams are D grind (part 25193-00B). These were used on 883s and 1200s 2000-2003 as well.
2004 1200 cams are W grind (part 25194-00B).
Stayed this way 2004, 2005, 2006.
From 2007 the same W grind cams are used in both 883s and 1200s.

883 heads have shallower chambers than 1200s and therefore longer valves to match. So, when stock, 883 heads cannot accommodate as much overlap in the cams as 1200 heads. "TDC lift" spec of the cam grind is the number you'll need to be mindful of.

Edit...
More info on retrofitting W cams in 2004 883s on Hammer Performance site: http://www.hammerperf.com/883conversions.shtml
Scroll down to FAQ and you'll find the info you are looking for.
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Here are the spes of the Ds and Ws, as well as some other common cams:

Code:
Cam         ←         Intake          →  ←         Exhaust          →  OL   LSA
            Open Clse  Dur'n    Lift     Open  Clse  Dur'n    Lift
            BTDC ABDC         Max   TDC  BBDC  ATDC         Max   TDC

Stock D      02   41    223  .458  .094   41    02    223  .458  .094  04  109.5
Stock W      10   25    215  .480  .133   38    12    230  .481  .138  22  100.3
Andrews N2   22   38    240  .465  .180   46    18    244  .440  .155  40  101.0
Andrews N3   17   33    230  .465  .216   43    11    234  .482  .216  28  102.0
Andrews N4   30   46    256  .490  .216   52    24    256  .490  .189  54  101.0
Andrews N6   34   50    264  .500  .241   56    28    264  .500  .212  62  101.0
Ebrock 1743  18   42    240  .590  .166   46    22    248  .590  .192  40  102.0
H-D 536      26   50    256  .536  .209   55    30    265  .536  .236  56  102.3
H-D 551      25   44    249  .551  .197   59    10    249  .551  .122  35  107.0
H-D 575      28   52    260  .575  .228   57    29    266  .575  .221  57  103.0

Lifts in ".
Lobe Separation Angles in camshaft °.
All others in crankshaft °.
Harley post the specs of their cams in the parts catalogues. At least in the SE Pro Racing Parts catalogue.
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Quote:
Originally Posted by IXL2Relax View Post
Totally missed this wealth of information.
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Quote:
Originally Posted by 1HD4CJM1X4K View Post
Totally missed this wealth of information.
IXL2Relax and Hippysmack do awesome work compiling and editing on Sportsterpedia! It has become an excellent go-to resource that saves on search function time.

Just note the line "Although cam specs are the same, fitting variations introduce compatibility issues". Below is a summary (from Hammer Perf) of some of the fitting variations that can be encountered.

Quote:
These stock W grind cams be retrofitted to 1991-2006 models, and a used set can often be found cheap on Ebay or the like. Just be careful to get a compatible set. 1991-2003 models need a set that's machined for the timing cup as shown on the left in this picture - nearly as we can tell they stopped machining them for the timing cup sometime during the 2006 model year, but always verify. Also pay attention to the pinion gear tooth pitch. To put 00+ cams into a 91-99 or vice-versa, you can either swap your pinion gear or move your old #2 cam drive gear to your new cams with a press.
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