Ernest
Aug 28th, 02, 7:10 PM
I have had my car for 3 years now, and have become pretty familiar with tuneing it. however, when i first got the car the idle was lopy and i was told it had a tall cam, im in school right now and dont have the numbers for the cam, but after tuning it the car idles fine but its real sooth now and no more lopyness, and doesnt have as much pick up as it used to. any ideas? its a 350, 4 bbl holley, i have the timing at 12 degrees advance, ( i also came from sea level, but already took care ofd the carb jets) should my timing be at a diff. mark? i want some of the initial kick i used to have.
Georgia69
Aug 29th, 02, 9:23 AM
If your cam is mild enough to idle smoothly, tuning it back to a rough idle won't help performance. How much is your total advance? You may want to start experimenting somewhere around 38 degrees.
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Mike Newby
69 Chevelle 355/TH200-4R
97 Grand Prix GTP
64 Chevy C10 Pickup
79 Suzuki GS550
SWHEATON
Sep 1st, 02, 7:27 AM
If you motor really does have a perf cam they often need 14,15,even16 deg static timing and approx 36-38 total deg advance. Check this out and i think you may solve your problem since the car had more powre just prior to your tuneup work.
Was your vac advance disconnected when you timed the car for you intial timing?
Did you re-connect your vac advance line when done and is it working?
Did you do something to limit you throttle so the secondaries don't open?
Scott
My guess is either a vacuum leak or something happened to the carb when you changed jets and now it's running way rich. Make sure the choke is fully opening.
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von '69 300 Dlx SS TC #15 ACES #1575 HSCA #5
My '69 SS (http://mywebpage.netscape.com/jerryacheson/vons69.html)
Steve B
Sep 1st, 02, 9:46 AM
You say in your post that you came from sea level. Does this mean that you now have the car in a place that is higher in altitude? If you are higher than 3,000 feet or so, you will notice a drop in performance due to the lack of oxygen. You should advance your timing about 1 degree per 1,000 feet from your optimal sea level setting to compensate, but the car will never run like it did at sea level.