timing advance
Thread Starter
Junior Member
Joined: Nov 2000
Posts: 23
Likes: 0
From: Houston TX
timing advance
What should I set my advance to? My mods are in my sig.
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1984 Camaro Z28
Crate 350
Edelbrock Intake
Edelbrock TES Headers
Hooker 3" Catback
ASP Underdrive Pullies
Corvette Shift Servo
JBL 150watt Amp
JL Audio 12" sub
------------------
1984 Camaro Z28
Crate 350
Edelbrock Intake
Edelbrock TES Headers
Hooker 3" Catback
ASP Underdrive Pullies
Corvette Shift Servo
JBL 150watt Amp
JL Audio 12" sub
Moderator
Joined: Jan 2000
Posts: 19,651
Likes: 309
SK,
With that size amp and subwoofers, you shouldn't advance it too much. (Just pullin' yer chain, dude.)
What information can you offer on the 350 crate engine? There are several varieties of crate engines with various compressions, chambers, head designs, cam profiles, etc.
A 350/300 could probably tolerate more advance than a 350 Fast Burn 385. It's also important to know the total advance on your distributor, so that maximum advance doesn't go so far that you get detonation under load. Are you using a distributor with vacuum advance? This can add another 10° or more advance at crusing speeds.
The fuel you plan to use can make a significant difference. I can advance my base timing over four degrees by switching to 93 octane gasohol over 89 octane gasoline.
Anyone can give you a starting point, but the best final setting will be accomplished by the trial-and-error method. Keep bumping the advance upward a couple of degrees at a time then drive the car for a few days. Keep advancing until you barely get detectable detonation, then back off the timing one degree at a time until you no longer get detonation under load. Make a note of this "ideal" setting and the type of fuel you're using for reference.
------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0
With that size amp and subwoofers, you shouldn't advance it too much. (Just pullin' yer chain, dude.)
What information can you offer on the 350 crate engine? There are several varieties of crate engines with various compressions, chambers, head designs, cam profiles, etc.
A 350/300 could probably tolerate more advance than a 350 Fast Burn 385. It's also important to know the total advance on your distributor, so that maximum advance doesn't go so far that you get detonation under load. Are you using a distributor with vacuum advance? This can add another 10° or more advance at crusing speeds.
The fuel you plan to use can make a significant difference. I can advance my base timing over four degrees by switching to 93 octane gasohol over 89 octane gasoline.
Anyone can give you a starting point, but the best final setting will be accomplished by the trial-and-error method. Keep bumping the advance upward a couple of degrees at a time then drive the car for a few days. Keep advancing until you barely get detectable detonation, then back off the timing one degree at a time until you no longer get detonation under load. Make a note of this "ideal" setting and the type of fuel you're using for reference.
------------------
Later,
Vader
------------------
"No matter how hard you try you can't stop us now"
Adobe Acrobat Reader 4.0
Thread Starter
Junior Member
Joined: Nov 2000
Posts: 23
Likes: 0
From: Houston TX
Its the GM crate 350. I really don't know the specs off hand. I have the stock HEI distributor and I always run 92 and up octane. I'm really just looking for a place to start. Thanks
------------------
1984 Camaro Z28
Crate 350
Edelbrock Intake
Edelbrock TES Headers
Hooker 3" Catback
ASP Underdrive Pullies
Corvette Shift Servo
JBL 150watt Amp
JL Audio 12" sub
------------------
1984 Camaro Z28
Crate 350
Edelbrock Intake
Edelbrock TES Headers
Hooker 3" Catback
ASP Underdrive Pullies
Corvette Shift Servo
JBL 150watt Amp
JL Audio 12" sub
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