55 Degrees Initial Timing.... Huh? - Page 3 - Chevy Nova Forum
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Old 12th-October-2019, 10:12 PM   #31
The Duke
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Got the timing down

It was a good day working on the car. We got the alignment dialed in which made the test drives a little less scary (putting the doors on helped too).

Here was the deal, it didn't want to run decent without 55 degrees initial. Huge cam, single plane intake & an 850DP Demon carb. Everyone agreed the carb and intake were an issue, and after today Sparky is finally on board. He is gonna be stubborn about that cam though. Last time over we switched power valves and tried to get the float levels right, but the fuel pump pulses made it really hard, so he ordered a fuel pressure regulator. Even just that made it run better. We got that regulator hooked up yesterday and got the float level where we were happy. Today we figured it was running good enough now to start backing the timing off. We are currently at 36 degrees initial plus mechanical not sure the RPM yet. We basically pulled 30 degrees initial out, in 3 attempts to make sure it still wanted to drive. We still have fine tuning to do, I think a 3.5 power valve. We are gonna start searching craigslist for a smaller carb, and he already got an RPM intake off craigslist.

I think the problem was that carb was pig rich and until we made those big adjustments (power valve, pressure regulator for float adj) that was the only way it would run.

We still need to adjust the valves again and obviously more tuning but I would say the 55 degree timing issue is solved.

Thanks for all the help and support I will report back once we actually have it running well. I think he could take it for a drive more than just around the block now.
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Old Yesterday, 11:58 AM   #32
The Duke
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Correction

That's 36 degrees all in, without the can hooked up.

Again thanks for the support.
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Old Yesterday, 01:34 PM   #33
71SS454
 
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Sounds much better. Demon carbs are something you gotta watch. They are set up fairly lean from the factory. For that one to be running so rich it tells me that having a carb so big, the carb just wasn't getting enough of a booster signal through the carb being on such a small engine. That engine really doesnt need anything bigger than a 650 carb. So with the 850, instead of getting nicely atomized fuel and air mixture, you were getting just raw fuel drops. Large drops do not burn easily of correctly, thus the need for so much timing. A Performer RPM wont cost any HP, but will boost torque on that little engine.
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Old Yesterday, 08:15 PM   #34
The Duke
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Agreed, not sure how much energy we are gonna throw at that 850, I am on the hunt for a cheap 650 or 670 carb we can go through.
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Old Today, 08:34 AM   #35
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Good work!
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