there's a demon in my engine!
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Lead Driver
Joined: Nov 2000
Posts: 6,628
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From: Albuquerque
there's a demon in my engine!
ouch, ouch. That's too much intial timing for your combo. i suspect your running hot. A little extra timing is good on these engines but I think you crossed a line.
bear tracks
bear tracks
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Joined: Jun 2002
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there's a demon in my engine!
Every couple of times i run my freshly rebuilt 400 (see gallery) I turn the key off it "diesels" for a half second and then it rotates in the opposite direction for three or four rotations. Am i too far advanced/retarded timing wise? Too rich/lean? Or am I just in need of an exorcism? Please help, I want to keep my beast alive and happy!
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there's a demon in my engine!
comp cams 260H: 260*total duration 0.484 total lift. No advance or retard on cam installation. Roughly 8:1 compression(stock). 18-22 deg initial advance with no vacumm connected@500-650rpm. (doesn't fluctuate, just can't remember.) Thanks in advance!!
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there's a demon in my engine!
Holley 600cfm vac secondary carb w/ manual choke. 68 jets in the primaries. See gallery for rest of specs.
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Joined: Jun 2002
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From: Blackville, SC, USA
there's a demon in my engine!
If you're going to set your initial timing that high, you may want to do it with the vacuum hooked up. Otherwise, I'd set it a lot lower.
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there's a demon in my engine!
Sorry! The vacumm is connected and its about 22*@800rpm. Just went out and put the light on it earlier today. Vacumm is tee'd from manifold to above throttle port to advance can on dist.
Senior User
Joined: Apr 2002
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From: cedar rapids usa
there's a demon in my engine!
Sounds like you have you vaccum advanced hooked to the wrong source. You shouldn't be getting that much advance at only 800 rpms. Unhook the vaccum advance, set your timing for 10-12*. Hook your advance into a "PORTED" (Ported means above the butterflys, on the 600 Holley I believe there is an port on the right side of the idle plate) outlet and recheck. Your timing should be around 36* total @2800 to 3000 RPMS.
