Gordonm

Is the idle eze system worth having on a Mighty Demon? The one I have does not have the system and I am thinking this could be trouble getting it to idle correctly. Do I try and sell it and get one that has it?

68coupe

It is a glorified vacuum leak, designed to replace the drilling of the throttle blades. I do not think it is worth it. Give your Demon a shot and see how it works, my bet is that it will be fine. If it is idling lousy, just introduce a vacuum leak, like uncapping one of the vacuum ports and see if it improves. If it does, then the idle-eze MIGHT (but I doubt it) help you.

You live in NJ, why didn't you go to the tuning session?

Thanks,
Joe

Gordonm

I should try it before I condem it. I was not around for the tuning session. I was going to go but could not make it.

68coupe

It was a blast, thanks to stew and the rest of the guys.
Lars briefly discussed the idle-eze.
I will be honest, I am really into the carb tuning stuff and I have never met anyone who actually used the idle-eze.
Thanks,
Joe

bobs77vet

i have it and its turned all the way so its closed.....i think you would really need a huge engine to benefit from this.

Gordonm

My understanding is the size of the cam not the cubic inches. My cam is going to have a lot of duration. I'm going to fire the motor up on the old 750 Holley because I know how it is set. I will then change to the Mighty Demon and tune it in.

bobs77vet

i'm thinking really big displacement and a really long duration and lift......like joe said i never seen/heard of any one actually using this

Gordonm

The more displacement the more duration the motor can take. A 383 can take about 10 more degrees of duration and act the same as a 350 with 10 less. So a really big displacement say a 454 SB can take a lot of duration and still act like a 350 with quite a bit less duration only a ton more torque. I went up about 5 degrees on the intake and about 10 on the exhaust over the cam I ran in the 350.

68coupe

The need for this is based on the cam. Back in the hot rod days, with a lumpy cam, they used to drill small holes in the throttle blades. To get technical, a camshaft with a lot of overlap, changes the pressure above and below the butterflies. Ideally, you want to have a pressure greater than atmospheric on top and a vacuum underneath. That is what sucks the air/fuel down. Some camshafts do not have this vacuum at idle, which causes the problem. With no vacuum, it is hard to pull in the correct fuel from the idle circuits, instead it is comes out of the transfer slots. This makes tuning really hard and results in a really rich idle mixture and a lousy idle.

Thanks,
Joe

Brettmc

Fixed it for you. Yes, do it.

Brett

Hitch

The idle ease is close completely on mine due to the posted discussion above. No need for it.. Keep it closed... Dave.. Why don't you get the Demon you need for that 383 anyway?? You need the 750 mechanical secondary version of the Speed Demon... Dave

Corz

dont listen to him Gordon, unfortunatley I'm not familiar with the idle-eze on mighty demons, but my road demon was the best investment i've done on my car.

Gordonm

With the size of the cam I am running the Mighty demon is a better carb. I'm running a lot of duration. They recomended anything from 240 to 260 @ .050 duration the Mighty Demon is the one to use. It is a 825 Mighty Demon.

73jst4fun

Your on the right track Gordon, try the Holley first, you may need to jet up and your famaliar how it works, then the Demon. We'll make you a fuel line like mine with the inline filter and 6an fittings, makes changing carbs easy. With all of that duration you'll need the higher CFM's. My idle eze has always been closed, Lars recommends closing it and forgetting about it......

Hitch

Hey you're right.. For some reason I thought that you had a 650 or something... That should do you great.... I've been thinking about going to the 750 with my new setup.. Dave.

Gordonm

I'll have a 750 Holley DP for sale as soon as I get mine up and running.

Hitch

No Holleys for me.. A BG 750 Speed Demon mechanical secondary will be the ticket... Dave.

MotorHead

My 825 Race Demon came with holes drilled in the throttle plates, maybe check to see if yours came that way. Mine idles and works perfect

Ganey

Demon Selection Guide
http://www.barrygrant.com/demon/default.aspx?page=5

redc3

i have a 850 dp speed demon on a 383 with really lumpy cam. the idle eaze does nothing . im very displeased with this carb