Duraspark II Conversion - How To
Fleet Mechanic
Joined: Aug 2002
Posts: 1,568
Likes: 33
From: Swansea SC
EF, you have a sender to the gauge and a sensor for the computer. On my 1985 sender to gauge is rear passenger side, where the sensor for the computer is up front on the coolant neck. The wiring harness does have the gauge sender and not the sensor for the computer. TR
Junior User
Joined: Jul 2015
Posts: 71
Likes: 1
From: Jackson's Point ON CANADA
I recently picked up a Motorcraft 2100 carburetor with a 1.08 venturi size for $25 (requires a rebuild). Is it a good carb to use for a Duraspark II conversion for my 4.9 300L six?
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From: Northeast, OK
The 2100 is a good carb, and with 1.08's it flows 287 CFM @ 3" of mercury, which is where a 1 and 2bbl carb is rated. But, that's only 203 CFM at 1.5" of mercury, which is where a 4bbl carb is rated.
This thread talks about the max carb size for the 300 six: https://www.ford-trucks.com/forums/8...er-yf-cfm.html
This thread talks about the max carb size for the 300 six: https://www.ford-trucks.com/forums/8...er-yf-cfm.html
Junior User
Joined: Jul 2015
Posts: 71
Likes: 1
From: Jackson's Point ON CANADA
The 2100 is a good carb, and with 1.08's it flows 287 CFM @ 3" of mercury, which is where a 1 and 2bbl carb is rated. But, that's only 203 CFM at 1.5" of mercury, which is where a 4bbl carb is rated.
This thread talks about the max carb size for the 300 six: https://www.ford-trucks.com/forums/8...er-yf-cfm.html
This thread talks about the max carb size for the 300 six: https://www.ford-trucks.com/forums/8...er-yf-cfm.html
New User
Joined: Apr 2016
Posts: 7
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Thanks. I'm going to order the harness from Summit. From what your saying, I can use the wire to my temp sender which is located on the passenger side of the engine at the rear and should be able to use the wire going to the oil sender which is located on the drivers side at the rear of the engine. I guess I should be able to get rid of the coolant sensor that goes to the computer once I install the duraspark distributor and ignition module.
Lead Driver
Joined: Jul 2009
Posts: 6,477
Likes: 19
From: Sheffield, AL
The 2100 is a good carb, and with 1.08's it flows 287 CFM @ 3" of mercury, which is where a 1 and 2bbl carb is rated. But, that's only 203 CFM at 1.5" of mercury, which is where a 4bbl carb is rated.
This thread talks about the max carb size for the 300 six: https://www.ford-trucks.com/forums/8...er-yf-cfm.html
This thread talks about the max carb size for the 300 six: https://www.ford-trucks.com/forums/8...er-yf-cfm.html
Moderator
Joined: Dec 2007
Posts: 7,987
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From: Boise, Idaho
However, you have to have a coil made specifically for it. Notice how the positive and negative studs are just prongs, instead of threaded studs with a nut.
