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I calc 2* retard
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Posted by Hans (more from Hans) on Sun, 23 Mar 2008 20:11:23 Share Post by Email
In Reply to: Re: 2.3 NA inlet cam on 900 2.1 head?, 900 Aero [Profile/Gallery] , Sat, 22 Mar 2008 08:12:00
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I calc'd 2 degrees retard for a b2x4 "short" head:

D = 720h/NP

where

D = amount of retard (crankshaft degrees)
h = change in cyl head height (1mm) [source: Saab factory manuals. Basically, NG minimum thickness is less than OG min. thickness by 1 mm]
N = number of cam sprocket teeth (mine's 38 teeth) [source: me – I counted ]
P = chain pitch (mine's 9.525mm or 3/8") [source: Iwis, Saab OEM chain company in Germany]

So running the numbers : 720*1mm/38*9.525mm = 1.989 degrees of retard at the crank.

Equation source: http://books.google.com/books?id=LFwW9SEf6hgC&pg=PA167&lpg=PA167&dq=D+%3D+720h/NP&source=web&ots=2oyTxXYr2T&sig=dv_aFJPiSA0mDR0RFZ99LgzTVa0&hl=en

Chain spec from Saab OEM supplier, Iwis:
http://www.iwis.com/index.php?id=674 (B202 chain type is G68WN, according to this page: http://www.iwis-flexon.com/index.php?id=53)


One thing I noticed with the B204 NA intake cam I use (from a mid-90s Motronic NG900) is that the distributor slot may be machined at a different angle. I never measured, but to adjust ignition timing with this cam on my B212 engine w/B204 head, the distributor is turned farther clockwise (when viewed from the front) than normal. I assume this is due to the slot angle in the cam.

posted by 71.35.16...

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