Anyone Running a Demon carb?
09-27-2007, 08:29 PM
#11
5th Gear Member
Join Date: May 2007
Location: Warner Robins,GA
Posts: 2,872
RE: Anyone Running a Demon carb?
If your only pulling 6 in. of vacuum, it is time to go to manual brakes. In my 357 i have 7 inches of vacuum but i run manual brakes. My cam spec's are 625/661 lift with 1.7 RR, dur @ .050 is 246/259. I run the Holley HP 750 with the four corner idle, no choke horn and no vacuum advance. I run a little rich also, i have adjusted the carb several time's. I will be getting a dyno tune that hopefully can correct it some, and i have a little over 11.1 comp., so i want to make sure everything is right. With my engine the shop said i will probably always run a little rich at idle since the engine was built for WOT.
09-27-2007, 08:54 PM
#12
4th Gear Member
Thread Starter
Join Date: Oct 2006
Location: Kentucky
Posts: 1,460
RE: Anyone Running a Demon carb?
ORIGINAL: FASTBLACK
If your only pulling 6 in. of vacuum, it is time to go to manual brakes. In my 357 i have 7 inches of vacuum but i run manual brakes. My cam spec's are 625/661 lift with 1.7 RR, dur @ .050 is 246/259. I run the Holley HP 750 with the four corner idle, no choke horn and no vacuum advance. I run a little rich also, i have adjusted the carb several time's. I will be getting a dyno tune that hopefully can correct it some, and i have a little over 11.1 comp., so i want to make sure everything is right. With my engine the shop said i will probably always run a little rich at idle since the engine was built for WOT.
If your only pulling 6 in. of vacuum, it is time to go to manual brakes. In my 357 i have 7 inches of vacuum but i run manual brakes. My cam spec's are 625/661 lift with 1.7 RR, dur @ .050 is 246/259. I run the Holley HP 750 with the four corner idle, no choke horn and no vacuum advance. I run a little rich also, i have adjusted the carb several time's. I will be getting a dyno tune that hopefully can correct it some, and i have a little over 11.1 comp., so i want to make sure everything is right. With my engine the shop said i will probably always run a little rich at idle since the engine was built for WOT.
09-27-2007, 09:05 PM
#13
4th Gear Member
Thread Starter
Join Date: Oct 2006
Location: Kentucky
Posts: 1,460
RE: Anyone Running a Demon carb?
This is what I'm leaning towards as a fix....
We told BIGS that our 9.5:1 302 typically ran a stout solid-roller camshaft and single plane intake, both of which made the idle quality tough to manage. BIGS made some internal modifications to the carburetor, such as the different idle air bleed orifice shown here. These types of modifications not only require extreme precision, but they require years of knowledge and experience. Unless you know carburetor function inside and out, we recommend you leave it to the pros to make such adjustments.
We told BIGS that our 9.5:1 302 typically ran a stout solid-roller camshaft and single plane intake, both of which made the idle quality tough to manage. BIGS made some internal modifications to the carburetor, such as the different idle air bleed orifice shown here. These types of modifications not only require extreme precision, but they require years of knowledge and experience. Unless you know carburetor function inside and out, we recommend you leave it to the pros to make such adjustments.
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