specs for timing/tuning
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Joined: Sep 2004
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specs for timing/tuning
Hi,
I have a 78 F150 w/300 I6. It is the original motor and I'm frustrated because I have conflicting information on timing and spark plug gap. Timing: A Ford dealership says 6 BTDC, Chiltons Says 8 BTDC and the sticker on my engine says 10 BTDC. Plug Gap: Autozone and Chiltons have it at about .042 while the engine sticker has it at .052. I can't set my idle and fuel/air mix on my carb properly until I get the tuning done but I don't know what settings to use. Help...
I have a 78 F150 w/300 I6. It is the original motor and I'm frustrated because I have conflicting information on timing and spark plug gap. Timing: A Ford dealership says 6 BTDC, Chiltons Says 8 BTDC and the sticker on my engine says 10 BTDC. Plug Gap: Autozone and Chiltons have it at about .042 while the engine sticker has it at .052. I can't set my idle and fuel/air mix on my carb properly until I get the tuning done but I don't know what settings to use. Help...
Junior User
Joined: Apr 2003
Posts: 69
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From: Fayetteville,AR
I have a 79 300 and use 7 degrees BTDC for the initial timing. Always set the timing with the vacum advance unplugged. I tried every degree (6-10) and found that 7 was the best for my truck. At 10 I had a lot of detonation and had to use 93 octane to calm it down.
Posting Guru
Joined: Apr 2003
Posts: 1,153
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From: Venezuela
Yes you are right! those engine years has a little bit higher compresion ratio, so the get bettere milleage BUT tend to produce detoning if ambient temp. is a bit hot.
For trucks used in tropical countries like mine (Venezuela) Ford had to produce a separator plate and a set of longer push rods to reduce compresion ratio to about 8.5:1 and eliminate that problem.
I think he should use what stiker say IF engine still stock...
For trucks used in tropical countries like mine (Venezuela) Ford had to produce a separator plate and a set of longer push rods to reduce compresion ratio to about 8.5:1 and eliminate that problem.
I think he should use what stiker say IF engine still stock...
Junior User
Joined: Apr 2003
Posts: 69
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From: Fayetteville,AR
I agree that if he is 100% sure that the engine and all of its components match the sticker then use it. Otherwise experiment with it and see what happens.
That 79 I got has a different intake manifold on it and I did not know this until I needed the firing order after the rebuild. Used the one on the intake and it was wrong (did not match the cam).
All I am saying is to be careful.
For the timing you could do it like the old guys up here do it. Uplug vacum advance and turn distributer until the motor pings. Back it down a little. Then plug in the advance and drive it. If it pings the back it down some more. If not then you are good.
That 79 I got has a different intake manifold on it and I did not know this until I needed the firing order after the rebuild. Used the one on the intake and it was wrong (did not match the cam).
All I am saying is to be careful.
For the timing you could do it like the old guys up here do it. Uplug vacum advance and turn distributer until the motor pings. Back it down a little. Then plug in the advance and drive it. If it pings the back it down some more. If not then you are good.
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