Join Date: Jun 2001
Location: Cedar Rapids, IA
motor not running smooth... fixed
I'm such an idiot....
I have had several posts before with my motor not running smooth. The motor was plagued with ocassional misses and a slightly roughness. I got lots of good ideas from this sight which eventually lead me to the fix. Two local speed shops went through my carb and one replaced the carb going from a Quick Fuel 950 to a Holley 850 and the motor ran alittle better. I'm not sure as to why things seemed better down sizing the carb. For some strange reason I begain to think that the Carb wasn't the problem. Since the beginging of of the problem this spring nethier the 950 or the 850 could be adjusted to make things right. So I then turned to the electrical system. I replaced almost every electrical part except the MSD 6 AL ignition box. The MSD 6 AL box was next to be replaced. I have done a lot of research lately and found a few things that I was doing wrong. My motor was to be timed to 36 degrees. I did not know that was the total timing needed to be done at over 3000 rpm to make sure that the mechanical advance was totally in. I was doing this 36 degrees at an idle.
I'm kind of out of it when it comes to these things. I also did not know that the carb needed to be adjusted after the correct timming had been done.
On top of all this, I put new plugs in this spring and and gapped them at .045. The previous plugs were gapped by the engine builder. A local auto parts store said to gap them at .045. Come to find out that they should be between .050 and .060 due to the compression of the motor. I gapped them at .054. After correcting the timing, adjusting the carb and cleaning and gaping the plugs to .054 the motor is running as good as when it came off the dyno, I think. I will be putting the 950 back on this weekend and I will work on adjusting it. I'm heading to the track next Saturday. I'm hoping to run in the high 10's to an 11 flat.
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67 Camaro, 454, TH400, 9" 4.11's