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snowrx

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Posts posted by snowrx

  1. Wow, very nice.  I was also thinking of a deeper pump housing, and dropping the PRV makes it look much simpler for those of us without distributers or charge cooler pumps. If you happen upon a deeper rotor/annulus set that fits the aux shaft let us all know.

     

    Is there a build thread for this project somewhere?

  2. When I received my car with ~60K miles, it already had a used primary shaft with sketchy splines in a box of take-off parts .  I bored my crank for the larger bearing when I rebuilt the engine, and fitted the HD circlip, but I am not full of confidence in the under-spec transaxle, which also showed signs of the crown wheel coming adrift.

  3. On 29/01/2024 at 10:30, drdoom said:

    Thomas, that injector placement was neatly done, straight into the manifold boss rather than adding a bung. Do you know of a source for the injector seat cutting tool?

    There are countersink style drills available to form an injector pocket, but I just used a normal drill bit and finish honed it with a flap of sandpaper in a die grinder to a good surface finish and fit.  My injectors seal at the bottom with O-rings, so it was just a matter of sizing the fuel rail to hold them in place with the lowest O-ring down in the bore, and the "cushion" ring resting on the manifold boss.

    image.jpeg.6b4f8237fc579323a18bca47d27ffa2e.jpeg

    I did the same when drilling the fuel rail, a bit of  radius helps get the O-rings in place.

    IMG_0001.JPG

    One tool, although maybe not at the best price:

    https://www.ebay.com/itm/203246043359?

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  4. I don't know of any problems at my (low) power level. I'm currently giving myself a hard time over not even noticing the bosses were off-center. I would have welded up the side of the boss and drilled them on center.  Unless you have spec'd a specific narrow injector spray pattern, it's likely that most of a typical 30 degree cone is going to end up hitting the walls of the port anyway.  I now realize that the twin spray injectors I selected to reduce port wall wetting might be compromised on one valve, and better aimed on the other.:hope:

  5. 13 hours ago, EXCEL V8 said:

    The problem with those bosses is that they point to the back of only one inlet valve - that may be by design to induce swirl but I'd have expected a more even fuel distribution like on the later S4 manifold if they had fuel injection in mind.

    Pete

    I suppose one could slant the injector bore to compensate for the offset, but that would complicate the fuel rail geometry with matching angled bores in a custom rail. Another thought would be to weld in a new centered bung for the injector. I don't really know what the gains would be, probably splitting hairs.

    The early carb manifolds, drilled for the vacuum fittings, had a more centered boss, but it points the wrong way.

     

    EarlyCarb.JPG

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