Main diff is inlet lift and short overlap. - Saab Performance Bulletin Board - Saabnet.com
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Main diff is inlet lift and short overlap.
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Posted by Ubipa (more from Ubipa) on Thu, 24 Jan 2002 13:23:48 Share Post by Email
In Reply to: 1985 16valve camshafts, Roger D [Profile/Gallery] , Wed, 23 Jan 2002 22:40:35
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Every other inlet lobe has 2mm less lift, which is designed to create more turbulence. The turbulence is to mix the air and fuel better. The downfall is it limits the flow, preventing more fuel and air from getting into the cylinder. From 86 on, the cylinder heads were casted w/ a design to create more swirl which in effect creates turbulence w/o limiting valve lift.
The other difference is that the matched 85 cams have a shorter valve overlap of 26 deg compared to 29. The shorter overlap insures more boost pressure is staying in the cylinder and not escaping through the exhaust. Actually, a set of performance cams for a turbo should not have more than 20 degrees of overlap.

Only the exhaust cam w/ it's 56-10 grind seems to be of any advantage. With a properly ported head there should be no need of the 85 intake cam. A small problem w/ using the 85 cam is its small duration compared to the 252deg intake duration, less new air/fuel will be able to get in. A better performance match of SAAB cams would be a 90-93 9000 intake cam w/ the 85 exh cam. They have an identical duration w/ only a 23 deg overlap.

B234 Intake has more hp's on highend than other cams (retard 3deg)
85 B202 Exhaust has more low end (3deg advance from b234)




posted by 4.40.3...

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