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Re:engine parts differences Posted by Saabu [Email]  (#1133) [Profile/Gallery]
(more from Saabu) on Fri, 29 Jun 2007 19:54:33
In Reply to: No 8v turbos after 84'...at least in the US....., Alfred E. Newman, Thu, 28 Jun 2007 17:26:39 Members do not see ads below this line. - Help Keep This Site Online - Signup |
i had an 83 900T 8 v that i was going to restore but didnt. however some of the components made it into an SPG block i rebuilt. so i know the major differences having learned the hard way:
8valve block - needs one hole drilled to anchor one of the 16v timing chain guides. 8valve crank wont migrate to 16 v - the woodruff key that turns the pulley is located too shallow due to a deeper timing chain housing on the 16v engine. I believe the turbo oil feed line originates in a different place but ends up at the turbo so a line swap is all that's needed (not 100% sure on that one). otherwise i beleive the blocks are identical. Oh, starter was moved on the 16v too.
Saab used lower compression pistons from the 8 valve engine with a special head that had lower CC volume to compensate for those pistons. that head has symmetrical intake ports which apparently allows for more porting as compared to the 86+ heads which went asymmetrical to promote swirl in the chamber. camshafts differ as well - the early intake cam was split lobe with 3 degrees less lift, and the exhaust cam had longer duration which makes it a bit better than later cams. an engine building buddy of mine said cams dont make a hell of a difference on a turbo engine - boost is king, but i got the preferred cams for my latest project, a 2.1L head/intake project. we'll see if they make a hill of beans or not.
those Pearlescent cars are incredible!
Wayne in Calgary
posted by 75.153.179...
_______________________________________ 1988 900 TC 2000 Viggen 1997 900 TC son has 2002 9-3 SET
, Thu, 28 Jun 2007 07:55:46, Fri, 29 Jun 2007 05:27:17, Thu, 28 Jun 2007 18:51:27, Fri, 29 Jun 2007 19:54:33 <-- Viewing This Message, Thu, 28 Jun 2007 20:24:49
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