Setting vacuum advance with hex key dont know which way to turn it?
05-20-2004, 09:14 AM
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Car: 1987 IROC-Z
Engine: 305 LB9
Transmission: 5 Speed
Axle/Gears: 3.70 Posi BW 9 Bolt
Setting vacuum advance with hex key dont know which way to turn it?
I have a accel vacuum advance distributer I changed the springs on the inside of the distributer 1 size lighter and in the accel manual it ssays how to tune the vacuum advance with the hex key in the vacuum advance thing which way do i turn it and how much to get more timing???
05-20-2004, 09:23 AM
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Car: 4
Engine: 6
Transmission: 5
IIRC, turning it clockwise makes it require more vacuum to operate the vacuum advance.
It doesn't affect how much timing the vacuum advance adds. What it does, is to allow you to set the point where the extra advance drops out, so that your engine doesn't ping under light acceleration in high gear or going up hills or whatever. You tune it to match the load that the car puts on the engine and how the engine vacuum responds to that load.
It doesn't affect how much timing the vacuum advance adds. What it does, is to allow you to set the point where the extra advance drops out, so that your engine doesn't ping under light acceleration in high gear or going up hills or whatever. You tune it to match the load that the car puts on the engine and how the engine vacuum responds to that load.
05-20-2004, 09:43 AM
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Car: 1991 Trans AM GTA
Engine: 5.7L TPI
Transmission: 700R4
Originally posted by RB83L69
IIRC, turning it clockwise makes it require more vacuum to operate the vacuum advance.
IIRC, turning it clockwise makes it require more vacuum to operate the vacuum advance.
thanks
05-20-2004, 01:04 PM
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I don't think so. My Crane adjustable you turn it all the way CLOCKWISE until it bottoms, then back it out as you count turns. More CCW turns = more vacuum required to bring in the vacuum advance.
Becuase of how adjustables operate it would be difficult to see it working any other way unless they use a left hand thread on the adjustement screw.
Becuase of how adjustables operate it would be difficult to see it working any other way unless they use a left hand thread on the adjustement screw.
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05-20-2004, 02:09 PM
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Car: '85 IROC
Engine: LB9
Transmission: 700 R4
Vaccum gauges are inexpensive, and having one allows you to check exactly what your curve is and then keep an eye on it as you're driving.
It will also let you know whether you're getting into the power circuit on your carb or not.
It's an indispensible tool for tuning, especially with fuel prices as high as they are.
It will also let you know whether you're getting into the power circuit on your carb or not.
It's an indispensible tool for tuning, especially with fuel prices as high as they are.
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