Hmmm... The stock cast-iron exhaust manifolds that came with the Citation, which 3-into-1 instantly and have a single output pipe on each side. Right-side (formerly front) pipe goes down and curves under the engine, to merge into the left-side (formerly rear) pipe where it comes down. I think this is stock Citation exhaust. It ends here with a 5-inch stub that's about 1-7/8" diameter. I've plugged a Honda Accord muffler directly into that stub. So this does sound similar to that short, high-resonance system you had. The citation had a long pipe on that stub, that went back into a cat and then into the muffler at the back of the car. Now that you've pointed this out to me, I wonder if looping a long pipe forward about three feet, thru a gentle curve, and back to a full-sized muffler, would make a difference, as your longer exhaust did. Not the cause of the clutch, you're right, but interesting nonetheless. Steve -------------------- >Steve, what are you using for an exhaust manifold. I ask because on >the Porsche engine, with the short exhaust pipe length and the exhaust >manifolds I originally used, there was an amazingly loud resonance in the >exhaust system at about the rpms you are having your problem. Truly >sounded like >something large and loose banging against something else >metal. > >Now I have the earlier manifolds, with longer distance from exhaust port >to the place where the pipes 3->1, and the relatively enormous stock >Porsche muffler, and the problem is completely gone. > >Not an explanation for broken clutch disks, but something to consider >relative to your vibration.
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