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Registered
Join Date: Sep 2002
Location: Leesburg, VA
Posts: 1,278
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Roughness at high RPM
During our NoVa Fun Run, I noticed roughness above 6000 rpm. In low gears, of couse. There was no law breaking going on.
 Seriously, it wasn't consistent and rpms would continue to climb, but slowly. If I had a clue I'd guess fuel starvation, like there wasn't enough fuel getting to the carbs to keep up with demand. Thoughts? Would valve adjustment or timing errors cause this behavior? I'm working on the "winter plan" and figured this would be a good thing to play with before the salt sets in. Greg
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Greg Last edited by rs911t; 11-26-2002 at 02:06 PM.. |
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11-25-2002, 03:54 PM
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Join Date: Sep 2002
Location: Leesburg, VA
Posts: 1,278
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Hmm. Interesting problem, indeed. Hmmm..
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Greg |
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11-26-2002, 02:06 PM
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Registered
Join Date: Apr 2001
Location: Linn County, Oregon
Posts: 48,570
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Greg, I'd check points first...could be worn a bit, and "bouncing" at higher revs...
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11-26-2002, 04:23 PM
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Registered
Join Date: Sep 2002
Location: Leesburg, VA
Posts: 1,278
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Well, Paul, funny you should mention points. I'm just now in from the garage after discovering another engine mod. I already knew it had the MSD 6AL ignition and MSD coil. I discovered it also has a Crane XR700 electronic ignition and optical points. I think PO #2 added these.
I've been reading MSD and Crane stuff this evening. The car has 7mm Bosch plug wires. MSD recommends 8.5mm. MSD also suggests checking the coil when missing at high revs. Gonna be a fun winter! Greg
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Greg |
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11-26-2002, 05:00 PM
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Senior Member
Join Date: Feb 2000
Location: Lacey, WA. USA
Posts: 25,308
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Superman says check the points. Then make sure the wires are good. You can suspect the expensive parts first, but nine times out of ten it's points or wires.
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Man of Carbon Fiber (stronger than steel) Mocha 1978 911SC. "Coco" |
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11-26-2002, 06:46 PM
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