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On 16 Apr 2004 at 15:41, Roush, Norman wrote: > I am considering the following > combinations of crank and PCs: > > Crank PCs Displacement > 69mm 88mm 1678 > 69mm 90.5mm 1775 > 74mm 88mm 1800 Bore is a lot cheaper than stroke. Berg has some max recommendations for type 3 engines, but I don't know what this is actually based on. I think he says heat, but he doesn't make his reasoning clear. > The 1678 and 1775 may need an increase in fuel pressure and the 1800 may > need an increase in fuel pressure and larger injectors. I would be > using these components: > > Counterweighted 8 dowel crank > Std heads but with some mild porting and polishing 3 angle valve job > Std cam > Std rods > Verified good used case > Std weight 8 dowel flywheel > Full flow oil system > All moving parts dynamically balanced As long as you're not planning to drag race and pop the clutch, and are going to use a standard flywheel, you really don't need the extra 4 dowels. I like the idea of the longer dowels, though, so I switch to those. I had to modify a reamer to do this, however. Get Berg's head porting white paper and follow it thru. Good head work is virtually free HP. Better breathing would also require a small increase in fuel pressure, and I think you should be able to use the stock injectors thruout the range you're considering here. Make sure you have the B brain for your FI. My 68 was a VERY nice car with a CW crank, balanced driveline, ported heads, and full flow filter. > I would really appreciate you ideas about these possibilities as well as > suggestions for compression ratios. Consider what you want to use for fuel. That pretty much determines the CR you can tolerate. -- ******************************* Jim Adney, jadney@vwtype3.org Madison, Wisconsin, USA ******************************* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ List info at http://www.vwtype3.org/list | mailto:gregm@vwtype3.org