300 I6 Distributor recurve
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Joined: Jun 2005
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From: Atlanta
300 I6 Distributor recurve
Can somebody tell me where to set the timing on a daily driver 1977 300?
My vacuum advance is way wrong somehow and I have it disconnected. If I had a perfectly functioning system what should the settings be?
8 BTDC for idle?
20 BTDC at 2000?
I don't know what "stock" is, so I don't know what to change. Any help would be appreciated.
My vacuum advance is way wrong somehow and I have it disconnected. If I had a perfectly functioning system what should the settings be?
8 BTDC for idle?
20 BTDC at 2000?
I don't know what "stock" is, so I don't know what to change. Any help would be appreciated.
Postmaster
Joined: Dec 2006
Posts: 3,603
Likes: 10
From: Spokane, WA
Set to what the engine "likes"...with a vacuum gauge. Advance the dizzy to the highest steady reading and then back off 1-2 hg. Adjust the carb idle mix to the highest steady reading and then adjust the idle speed. Go back through that routine again. You are now at your starting point. Drive it and see if it take more advance or needs less. Adjust accordingly.
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Joined: Dec 2007
Posts: 7,987
Likes: 104
From: Boise, Idaho
Unfortunately, with the stock timing marks, it's difficult to see the timing beyond around 14° advance.
But, as Harte3 said, disconnect the vacuum advance and time it by vacuum. It gets the best results.
Then, reattach the vacuum advance and go for a drive. If overall it feels good, but pings under heavy acceleration, you can readjust the vacuum advance canister by sliding a hex wrench in the end (I think it's a 3/32") and turning it. I believe counter-clockwise makes the timing come in later, clockwise = sooner. It's around 1 - 2 full turns for 1hg of vacuum sooner, so don't be timid with your adjustments.
But, as Harte3 said, disconnect the vacuum advance and time it by vacuum. It gets the best results.
Then, reattach the vacuum advance and go for a drive. If overall it feels good, but pings under heavy acceleration, you can readjust the vacuum advance canister by sliding a hex wrench in the end (I think it's a 3/32") and turning it. I believe counter-clockwise makes the timing come in later, clockwise = sooner. It's around 1 - 2 full turns for 1hg of vacuum sooner, so don't be timid with your adjustments.
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