Best plugs for 4.9L ?? Timing ?
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I'm running Autolite 45s and 13BTDC with good results on high compression. My old 300 ran very well at 18BTDC. For these old engines, the best way to time them is to turn it to where it runs best, then back off till it stops pinging. An EGR might change the way you have to time it, but you can be a little more aggressive with that.
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My old 94 liked 12 deg BTDC with Motorcraft copper core plugs gapped at .050. It had a good quality Taylor low resistance sprial wire set with OEM type (brass contacts) cap and rotor. Truck was a sb reg cab and weighed about 4000lb. It had 3.55 gears and 235/15/75 tires. The timing and wire change increased acceleration slightly and the truck was capable of delivering 20 mpg at 60 mph.
My 95 is an extended cab with a sb and it has 3.08 gears. I used the same formula as the 94 but i had to back off the timing to 10 BTDC. I used Autolites this time (on sale) set to the same gap. It averages about a mpg less but actually performs slightly better than the 94.
I did consider a "performance coil" but my originals always tested fine and had no trouble with the .050 gap. Some users will open the gap to .055 on the plugs but I was concerned about cold weather starts. You can adjust the timing by using a vacuum gauge and the "sixliter tune up" has been a popular mod.
Regards
rikard
My 95 is an extended cab with a sb and it has 3.08 gears. I used the same formula as the 94 but i had to back off the timing to 10 BTDC. I used Autolites this time (on sale) set to the same gap. It averages about a mpg less but actually performs slightly better than the 94.
I did consider a "performance coil" but my originals always tested fine and had no trouble with the .050 gap. Some users will open the gap to .055 on the plugs but I was concerned about cold weather starts. You can adjust the timing by using a vacuum gauge and the "sixliter tune up" has been a popular mod.
Regards
rikard
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The "Sixliter tuneup" refers to a write up done by Sixliter for the 302 but it will work for other engines as well.
It consists of low resistance ignition wires a MSD rotor, cap, coil, and Motorcraft copper plugs.
The plug gap is set to .055 instead of .044 and timing is set at 14 BTDC instead of 10 BTDC. The low resistance wires and aftermarket coil allow the larger gap to work producing a bigger spark. Most users report better performance and gas mileage
For more details doe a search on any of the Ford sites.
regards
rikard
It consists of low resistance ignition wires a MSD rotor, cap, coil, and Motorcraft copper plugs.
The plug gap is set to .055 instead of .044 and timing is set at 14 BTDC instead of 10 BTDC. The low resistance wires and aftermarket coil allow the larger gap to work producing a bigger spark. Most users report better performance and gas mileage
For more details doe a search on any of the Ford sites.
regards
rikard
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SPOUT connector photos
SPOUT connector info
Ford Fuel Injection » Setting the timing
You should be able to find a picture if you Google spout connector as there are different styles.
Jim
Ford Fuel Injection » Setting the timing
You should be able to find a picture if you Google spout connector as there are different styles.
Jim
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