Eddy 650 AVS vs. Holley 650 DP

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gliderider06

gliderider06

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Kinda a poll on what everyone thinks of the 2 carbs. I now have a Holley 650 DP on my motor and it runs great (kinda thirsty tho), but I did just purchase an Eddy 650 AVS and the tuning kit. Yet to still put it on. What are your experiences with them and are the AVS's much better than the Holley like I have been hearing? Comparing them with the same cfm ratings. What do you think?
 
much better in how?

fuel economy?
performance?
 
If you are running a manual trans, then go with the double pumper. If you are running an auto trans, go with the Eddy. It's difficult to tune a double pumper for an auto trans. Can be done, but difficult.
 
gliderider06 said:
I now have a Holley 650 DP on my motor and it runs great (kinda thirsty tho)....
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That's what I think. I think the AVS has the potential to wring out a little bit better mileage than the Holley, because of the metering rods; I'm not counting in the fact that the Holley is a DP. Sure, I could be wrong.....but it makes sense to me. I like the AVS.
 
i think this is like asking someone what there favorite beer is. everyone has there preference for one reason or another. it depends on what your doing with the car. you wont see many AVS carbs at the drag strip and you wont see as many holley dp's on the street. they each have there use.
 
krazykuda said:
If you are running a manual trans, then go with the double pumper. If you are running an auto trans, go with the Eddy. It's difficult to tune a double pumper for an auto trans. Can be done, but difficult.
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I usually hear this from people who have never owned a double pumper. And it's incorrect.
 
Both can be highly tuned, The Holley can be adjusted more and in wider ranges. For all out performance you will almost in all cases see a Holley.

I believe a lot of people are more experienced in tuning one over the other so their choice is naturally going to be the one they are more familiar and comfortable with.

To me, for general use - flip a coin ... I use the factory AFB on mine, as it is a resto, I also have plenty of them around here so parts, metering rods and jets are at hand.
 
krazykuda said:
If you are running a manual trans, then go with the double pumper. If you are running an auto trans, go with the Eddy. It's difficult to tune a double pumper for an auto trans. Can be done, but difficult.
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stiff gears
stiff converter
good power to weight ratio
no problem
 
Since you already have both carbs, tune each one the best you can and report back which one you like best.
My guess the Holley will "hit harder" and give more performance, while the Eddy will be more refined and give better milage but less overall performance.
 
younggun2.0 said:
i think this is like asking someone what there favorite beer is. everyone has there preference for one reason or another. it depends on what your doing with the car. wont see many AVS carbs at the drag strip and you wont see as many holley dp's on tyou he street. they each have there use.
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This I agree with.

Kenny
 
70aarcuda said:
much better in how?

fuel economy?
performance?
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It's really what your looking for?

The Holley will probably run a hair richer in normal driving in stock form. But, if you keep you're right foot out of the secondaries, there's not a huge difference..... Wide open, the flow is the flow. Very close in performance on a engine that requires a carb of that size.
 
Rick's on the money. Both work well.The Holley ,slightly richer ,O.O.T.B. The Eddy,a bolt on,less maintence deal. Street cruiser? Edelbrock. Street bruiser? Holley. Both carbs,can do anything,you want. Take's verve, and commitment.
 
I run a 650AVS on my mild 318.
broke it in on the dyno and the AFR was spot on all the way from idle.

I've never ran a Holley DP, but I've seen plenty catch fire.
 
I think part of my poor milage is that I can't keep out of the pedal. I have the Holley tuned really good and it will start and idle cold with out a choke or pumping it to start. I will do the Eddy comparison and report back. Since it is only driven on the street, I will do my best tuning the Eddy.
 
gliderider06 said:
I have the Holley tuned really good and it will start and idle cold with out a choke or pumping it to start.
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That right there tells me it's running too rich!.....so it might not actually be that you can't keep your foot out of it.
 
I don't know if you've considered this, but why not keep the Holley and take the money spent on the AVS and invest in a wideband. I did that early last year and it was easily THE best thing I could have done to help me understand how to really tune a carb. I went from running so rich it made my bumper black to being able to average 21 mpg during Drag Week with an 850 double pumper. When you can visually see what each change you make does it helps to understand what is needed to obtain a certain goal. Mine was maximum fuel economy on the highway without affecting wot performance, and through some trial and error I got it. If you're willing to learn that could be an option. There are guys here that really know what their doing when it comes to Holleys so you can always ask for help. Just throwing that out there.
 
70aarcuda said:
spontaneous combustion????
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100_3079.jpg

The horizontal tube between the bowls is a common culprit, as is bad ignition timing on a first startup with a freshly assembled engine.

I'm not saying there's anything wrong with holleys, both are great. I was just having a razz =)
 
Both carbs have their place. IMO, the Holley is geared more toward a hotter street/race scenario, while the AVS is much more forgiving for the street. The AVS is comparable to the Thermoquad in streetability. The secondary air door completely controls air and fuel flow, just like a Thermoquad and unlike with an AFB. If you're after any semblance of mileage, run the AVS.
 
younggun2.0 said:
i think this is like asking someone what there favorite beer is. everyone has there preference for one reason or another. it depends on what your doing with the car. you wont see many AVS carbs at the drag strip and you wont see as many holley dp's on the street. they each have there use.
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X's 3 on this. While both cam perform great, it can often be a personal choice. Actual drag strip or dyno numbers may very well tell 2 different stories, so, in the end, it truly is what ever you like on your car.
 
So, I put the Eddy on today and I wanted to report back on what I thought.
I bought the carb used from Ebay took it apart and put an accelorator pump in it, cleaned it, took the choke off and put it back together with stock jetting and metering rods.
Bolted it on the motor and cranked it for about 5 seconds and it fired right up, never touching the gas and no choke. Set the idle, and mixture screws. bolted the A/C on and went for a spin. I have always run Holleys, except for a 600 Eddy some time ago and did not like it. I must say I AM impressed with this one. The driveability and throttle response is much crisper and smoother. Cruising through town and shifting gears is not as jerky.
I do have some issues with the air door which will take some adjusting. It comes on really early, but am slowly getting it dialed in. I did put the next stiffer metering springs in it, but it started raining before I got to drive it. I have about 15" vacuum thats why i stepped it up.
Now I have a rod question. It has the 68x47 rods and I do have the tuning kit. Which number is the power and cruise numbers? is the larger the power or is it the cruise. If I want to go richer do I use a 65x47 or a 68x42 rod?
Thanks all!
 
If that's the case, your holley wasn't close to right on a tune up.

UOP has a great suggestion if you really want to get all you can out of any carb.
 
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