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Old 03-22-2012, 06:33 PM
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HELP timing issue

Ok guys, Im a almost 40 something and reliving my youth through my son and his 70 nova, mine was a 71. Anyway, last weekend took it down to a short block, installed a new cam (edleb 2102 advertized duration of 278), lifters, chain, gears, fuelies 194, performer intake, performer carb, accell shorty header plugs, headers, and HEI.

Heres the issue: It will start will starting fluid, idle lumpy at about 450 RPM, timing is about 10 Retarded, try to raise idle any and it jumps to 1100 RPM and timing 12 BTC (all timing is via straight timing light and timing marks).

THERE IS NO INBETWEEN.... I have never seen this issue before and am a bit clueless as to why.

Any help is appreciated!!!! Thanks!

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Last edited by vicariouslynova; 03-22-2012 at 06:57 PM.
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Old 03-22-2012, 07:07 PM
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With vacuum advance disconnected and plugged, move the timing to 12 degrees before top dead center, then idle it down. Reconnect vacuum advance to a manifold full time source, one that pulls vacuum at idle, recheck timing, it should be 18 to 24 degrees advanced. Idle it back down to around 700 rpm. It also sounds as if the mechanical advance in the distributor is sticking so you may want to remove the rotor button and check.
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Old 03-22-2012, 08:29 PM
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Did you break the cam in like normal?
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Old 03-22-2012, 08:33 PM
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normal to me anyway yes. 2000 rpm for ten min.
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Old 03-22-2012, 09:06 PM
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Break in period is supposed to be 20 to 25 minutes.
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Old 03-22-2012, 09:08 PM
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okay....what does that have to do with timing?
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Old 03-22-2012, 10:22 PM
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Have you adjusted the idle mixture?
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Old 03-22-2012, 10:48 PM
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Time it like Doublevision suggested. What does break-in time have to do with timing? Don't know what oil you are running but with modern oils lacking in ZDDP (zinc) wiping a lobe off the cam is rather easy. Wiped lobe on cam and you'll never get it running right let alone be able to time it.
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Old 03-23-2012, 01:06 AM
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Quote:
Originally Posted by vicariouslynova
Ok guys, Im a almost 40 something and reliving my youth through my son and his 70 nova, mine was a 71. Anyway, last weekend took it down to a short block, installed a new cam (edleb 2102 advertized duration of 278), lifters, chain, gears, fuelies 194, performer intake, performer carb, accell shorty header plugs, headers, and HEI.

Heres the issue: It will start will starting fluid, idle lumpy at about 450 RPM, timing is about 10 Retarded, try to raise idle any and it jumps to 1100 RPM and timing 12 BTC (all timing is via straight timing light and timing marks).

THERE IS NO INBETWEEN.... I have never seen this issue before and am a bit clueless as to why.

Any help is appreciated!!!! Thanks!
The retarded initial timing is causing the carb throttle blades to be opened up so far to get it to idle, that the carb is trying to idle more on the transition circuit than the idle circuit. I'd wager that the way it is now, the idle mixture screws do very little when you turn them in or out.

And having the throttle blades opened too far at idle can cause the RPM to jump up instead of increasing smoothly when you try to give it some throttle.

As suggested already, get the initial timing up to 12-14 degrees or so BTDC at idle, readjust the idle speed and the idle mixture screws (this may require re adjusting the idle speed) until you get it idling and acceleration off idle smoothly.

That cam will have a bit of an idle to it, so don't be overly concerned if it doesn't idle glass-smooth.

An article that will probably help is HERE. Be sure to pay attention to the total timing- you want it to stay around 34-38 degrees depending on the engine combo. When you add or subtract from the initial timing, the total timing also moves a like amount.

Glad to hear you're back into the car scene w/your son. Have fun!
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Old 03-23-2012, 07:44 PM
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got it

Cobalt nailed it. BAck to basics. I had the distributor out a couple teeth and I did NOT know the proper position for #1, via the article I now know,,, I always thought that #1 on the cap was the first one clockwise from the Coil "TAB" where the conections are.

Reset the dist, moved all the wires over one, hit the starter and wham it ran and idled. Set the timing to 10 BTC (as best as my light will allow) and Im in heaven again... I think I get more out of this than my son does but I think he thinks its funny to see his dad smiling from ear to ear and a smile on his face like a kid again.

We have been through the the worst four years that we have ever had, and this venture has been almost a revival for me,,, I hope my boy gets into it eventually as mush as I do. THANKS GUYS!
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