Wasup with my new Edlebrock carb? Spacer??

[chgr500]

Bought a new Edlebrock 600cfm carb for my 70 383ci. The old carter had done it's time. Stock engine with a slight amount more lift on my cam than a magnum grind.  So 10:1 comp and 906 heads.  I set my carb up on a four gas analyser and I have excessive hydrocarbons at idle.  Just off idle everything clears up real good so I am attributing that to my cam duration at idle.  You may wonder why I care about the unburnt fuel at idle anyway...well I get to participate in the clean air programme if I wish to by insurance coverage each year. I have air care testing that is based on your vin number factory engine code regardless of any mods or engine swapping.  I always have to detune my car to pass the test.  Runs like a bag of s!%# and stinks,  but hey I pass again.  Ran through one year with no pcv or any type of vacuum on my carb.  Hissing and sucking air from anything possible mixing up my too rich fuel mixture with fresh clean air so I can trick the machine and buy insurance.  Anyway to my problem with my new carb besides the rich at idle concern.  I put an open bore 1" spacer under my carb and hear a strange whistling noise especially on decel.  Seems like I'm starving for fuel on light take off and I feel that same hesitation when I tip into the throttle at highway speeds.  I'm wondering if these concerns are all related to the spacer I used.  Perhaps some weird turbulence mixing up the fuel air mix at that point? Maybe screwing up at the fuel transfer mix point?  I have ordered a split spacer to match my intake,  but it's two weeks for arrival.  Wondering if anyone has had experiences similar to this with that spacer?  Thanks for any input. Ron

[dodge freak]

Do you have a MSD box now ? If not I would get one, it help burn the gas better and my help you pass the test. Don't know much about Eddy carbs. Sorry

[deputycrawford]

I am inclinded to think your Eddy carb is not using the idle circuit like the rest of them that have bigger than stock cams. Mine did not and I went with a Holley style Demon carb with great results. You might try a Holley style carb and see if that clears up the idle problem. VERY common with the Eddie's. Many of my drivibility problems cleared up with the new carb.

[chgr500]

No I just upgraded to electronic ignition. Bought an OEM electonic ignition conversion kit off eBay. Came out of the stone age with my points.  I thought I was gonna be doing pretty good....new ignition system and carb all in one summer.  I'm also wondering if I went too light in the pants on carb choice and that is attributing the hesitation I feel on the primary side from light throttle take off and tip in speeds at highway driving?   Can always jet it I guess. Everythings great when you boot it.   I'm a little frugal when it comes to spending $$$ on my Charger.  OK I'm cheap.  I paid $750 for it in 1984 and like to keep my costs down.  I usually buy and swap and sell parts to earn money for the Charger fund. I like to have all those 3rd gen Mopar toys like spoilers wings louvers all over cool interiors and cassette players, humps and bumps everywhere with flapping hoods and machine gun tips hanging out back so as to keep the spectators stop drooling at those 2nd gens here at local car hangouts.  (Don't worry I've had a few 2nd gens in my time, even a hot pink 70 BB with fur glued to the headliner and dash...no wonder I got it for free) I don't use my hard earned work dollars for my Charger.  Well sometimes....when the wife ain't lookin LOL

[firefighter3931]

The whistleing is a vacuum leak most likely at the carb base. The stumble off idle means it's going lean at the tip in which is most likely related to the vacuum leak. The rich smell at idle is a jetting issue. Have you tried adjusting the idle mixture screws ? If so, does the idle quality change when the screws are closed off. It sounds like you need to do some tuning to dial it in.  


Ron

[chgr500]

The whistling is a vacuum leak most likely at the carb base. The stumble off idle means it's going lean at the tip in which is most likely related to the vacuum leak. The rich smell at idle is a jetting issue. Have you tried adjusting the idle mixture screws ? If so, does the idle quality change when the screws are closed off. It sounds like you need to do some tuning to dial it in. 


Ron

Ya hey firefighter.  I would likely not call the noise a whistle like you would expect from a vacuum leak.  It's sorta of a hoot/grunt type air moving noise heard mostly on decel under load when coming to a stop. (gotta love that description) The adjuster screws make a huge difference when I adjust them on the four gas.  I never did road test the carb with it running in a rich condition...maybe it's just running lean on the primaries explaing the hesitation?  Re jetting it could fix that up,  but first i'll get the proper spacer to match my intake. That was one of my biggest problems on my old carb.....adjust the mix screws all you want and it always ran rich along with stalling conditions and starting problems.  The new carb is great in all aspects except the stumble at tip in.  I still attribute the high hydrocarbons at idle to the cam .... as just off idle everything clears up real fine.  When they test the car at idle it's in park so I will just bump the idle up (as usual)  to max and set the timing back and I'm sure it will pass fine on the idle test.  When I load the car up and watch the four gas again everything looks good so I'm sure it will pass on the dyno test.  One good thing about this testing system it will certainly tell you the integrity of your internal engine components.  Yet there's almost always a way to trick these testing machines.  Fuel injection is a little trickier but still possible depending on what the vehicle fails on.
Try another carb deputycrawford.  This is a brand new carb.  Took me all these years to buy this one LOL  Thought I could rebuild my carter forever  Oh well 35 years for a carb ain't that bad.  Plus I moved up to that electronic ignition thing already this year and said goodbye to my points. Now what am I going to do with my dwell meter?  LOL STONEAGE CHARGER

[myk]

I've got a 750 'eddy and I've dealt with problems like yours.  I handled the hesitation with a bigger accelerator pump squirter; apparently hesitations at tip-in is a common complaint among 'eddy owners.  If you've got a 'cam that doesn't allow enough vacuum your 'eddy won't like it and behave accordingly.  You might wanna' try moving the accelerator pump drive link to the bottom hole, if you haven't done so already.

Just for the record, a Holley is far more adjustable and easier to do so with.  My next 'carb will be some sort of Holley...

[chgr500]

I've got a 750 'eddy and I've dealt with problems like yours.  I handled the hesitation with a bigger accelerator pump squirter; apparently hesitations at tip-in is a common complaint among 'eddy owners. If you've got a 'cam that doesn't allow enough vacuum your 'eddy won't like it and behave accordingly. You might wanna' try moving the accelerator pump drive link to the bottom hole, if you haven't done so already.

Just for the record, a Holley is far more adjustable and easier to do so with. My next 'carb will be some sort of Holley...

I'm thinking you are likely right myk....I didn't expect to start spending more money on carb jet kits and accelerator pumps along with taking my new carb apart so I can get it running to prime....seems kinda like my old one.  I haven't touched my accel linkage so I'll have to look and see what position it's on...that could help.  First I need to get rid of that noise concern I have and then play with jets and rods, pump ...yeh more$$$$ Hmm wonder what a guy could get for a like new eddy carb on eBay?
Holley huh?  What are you other guys running on your stocker type BIG BLOCKS with cast intakes???

[myk]

I mentioned the Holley for its adjustability.  For example, the 'Eddy has 3 squirter sizes: smaller than stock, stock and NOS-fogger-I had to hope that the NOS-fogger size worked, as the stock size was too small.  The Holley on the other hand has a whole spectrum of squirters to fine tune your application.  I'm not saying that the 'Eddy isn't workable, only that fine tuning for an individual application seems to be that much more possible with a Holley.

Oh, and when it comes to these cars cost can't be a consideration-lol...