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Old 05-17-2004, 10:38 AM
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Looking For Road Demon Owners

I just installed a Road Demon and tried some different jetting on it and am not really impressed with the throttle response or acceleration compared to the Edelbrock that I took off.

Anyone have the same carb that has a opinion one way or the other?

I have the 625 on a Ford 390 used for towing.
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Old 05-17-2004, 11:41 AM
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I have a road demon Jr and I love it. When you installed it, did you read the instructions? or just bolt it on turn a few screws? the demon is very precise carb, it must be on the money for it to perform correctly, many who buy demons learn this the hard way, when I got mine I wished it would have been as simple to slap it on tune it and go, but it took me a few days before I got it right, I was thinking when I got it "it`s just another carb, who needs the instructions? I`ve been fooling with carbs for years" and it proved me wrong. Once I got it right after confirming I followed the instructions to the T, I couldn`t be happier with it.
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Old 05-17-2004, 12:23 PM
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Read the instructions and watched the video more than once.

The idle is clean and off throttle is clean and precise, But just seems to lack the response and acceleration from a cruise to a power state.

Tried several different jet sizes in the primary and secondary's and didn't notice any difference. Also tried PV change and Secondary spring.

BTW: What did you end up doing to get it right on?

Last edited by Tmod; 05-17-2004 at 12:56 PM.
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Old 05-17-2004, 01:25 PM
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The use of a vacuum gauge was a huge benefit, played with the fuel pressure some until I found what it liked, Even fooled around with squiter nozzle sizes. My carb came with a 6.5 PV, after looking at the vacuum gauge and it coming in at around 15 - 16 inches, I went to a 9.5 PV and that helped a bit. One thing demons do like is a lot of spark timing advance.
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Old 05-17-2004, 02:18 PM
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I have my initial timing set at 16 degrees BTDC.

I used a vacuum gauge to set the idle mixture and that is ok, I have the screws turned out 3/4 from seated on both pri & sec.

I also ended up with a 9.5 PV and a in gear idle vacuum of 16".
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