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Old 04-23-2003, 11:45 AM
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Post New 383 Stoker Motor

I just put a new motor in my 71 nova, it is a 383 stroker motor in it. Well here is the story, when I first got it running I didn't have a timing gun so I just put the timing where it would run smooth and sounded good. Well when I got a timing gun on it it was running somewhere around 16 to 18 degrees before TDC, when I put the timing at 12 degrees BTDC where it needs to be it runns really rough and it won't run at an idle in drive. Just woundering if anyone has some suggestions.

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Old 04-23-2003, 12:02 PM
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What Cam? What Heads? What intake carb, etc. Check for vaccum leaks, adjust valves.
Keep in touch!!!
Slider in Wa.
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Old 04-23-2003, 12:42 PM
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It has 1.94 64cc Factory GM heads, a 230 duration, 490 intake, 490 Exhaust, I'm running a power plus typhoon intkae manifold and a 750 cfm Edelbrock square bore carb, and it is compression is at 9-1
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Old 04-23-2003, 02:16 PM
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Could the distributor be one tooth off?
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Old 04-23-2003, 02:47 PM
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that shouldn't change what the timing apears to be should it?

[ April 23, 2003: Message edited by: Chevy Thunder ]</p>
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Old 04-24-2003, 05:53 PM
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It could make a pile of difference,I would just disco the ignition cap,pull # 1 plug,find TDC and start again.That cam is not to raunchy so it should run at the manufacturers recomendations fairly easily.
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Old 04-24-2003, 08:01 PM
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never mind I'm just cracked out, I understand why it could make a difference.
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Old 04-25-2003, 04:54 AM
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[quote]Originally posted by Copper Top:
<strong>It could make a pile of difference,I would just disco the ignition cap,pull # 1 plug,find TDC and start again.That cam is not to raunchy so it should run at the manufacturers recomendations fairly easily.</strong><hr></blockquote>

If a timing light says the engine is running at 12 degrees BTDC by the light that is where it is running. The distributor being one tooth off will just cause you to have to twist it to an odd position to time it. I have done this on purpose for clearance.

As for the timing, some engines like faster timing at idle. You then just limit the advance so you dont go too high as RPM increases. 36 to 38 would be the high end limit. If the engine ran fine before with no detonation, I would set it back to 18. 12 is no hard and fast rule. It works alot of time, and alot of time it doesnt.

Chris
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Old 04-25-2003, 12:31 PM
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How do I limit the advance so that it won't go past 36-38 degrees BTDC, or does it just limit it's self, that is what I thought.

Also since I have the cam shaft the I do (230 duration 490 int. 490 exht.) and I have a stock torque converter, could that be the reason for it not wanting to idle while the car is in drive.
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Old 04-25-2003, 12:41 PM
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Oh ya, Chris AKA turboS10, that is one of the most ****** S10's in my opinion, looks like a lot of man hours went into that bad boy, what kind of specs are on that thing.
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Old 04-25-2003, 05:48 PM
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OK, I'll stick my neck out and 'assume' you have vacuum advance? Did you check the timing with the vac line disconnected? (and plugged) Also check to make sure you have the vacuum advance line connected to the correct port on the carb after setting the timing. (NOT to manifold vacuum!)
The mechanical advance is limited by a bushing just under the advance weights inside the distributor. The advance 'curve' is adjusted by changing the little springs attached to the weights.

[ April 25, 2003: Message edited by: RaggMopp ]</p>
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