Autolite or Edelbrock
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Mountain Pass
Joined: Sep 2020
Posts: 167
Likes: 4
Autolite or Edelbrock
Hey gang I’ve got an 86 bronco with the straight 6. I’ve upgraded Efi manifolds and offenhauser c series with a cheep Chinese Amazon 2barrel replica of the motorcraft 2150. It’s running good enough to drive but now I’m about to invest in a new proper carb and am receiving mixed advice. I’ve had several people say that any 4 barrel is too much carburation for these engines. I’ve only heard good news about the motorcraft 2150 being reliable and easy to tune. However there’s also talk of the edelbrock 500 being the perfect fit for best gas mileage and power so I’m at a decision that I’d like to make with the advice of this forum. Please enlighten me. Thanks.
More Turbo
Joined: Nov 2015
Posts: 710
Likes: 111
The 300 six even with a stock cam will tolerate a 4 barrel carb.
The Edelbrock AVS2 500 cfm carb has annular boosters like the 2100/2150 two barrels.
It is also a spread bore carb so you will running on the small primaries most of the time and will have good throttle response.
You can try using it right out of the box but most find it necessary to install an air/fuel ratio meter to fine tune it to the 300 six for best fuel mileage.
Are you still running the stock cam?
The Edelbrock AVS2 500 cfm carb has annular boosters like the 2100/2150 two barrels.
It is also a spread bore carb so you will running on the small primaries most of the time and will have good throttle response.
You can try using it right out of the box but most find it necessary to install an air/fuel ratio meter to fine tune it to the 300 six for best fuel mileage.
Are you still running the stock cam?
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Mountain Pass
Joined: Sep 2020
Posts: 167
Likes: 4
Also from what I understand you say that the edelbrock 500 only uses 2 primary jets and goes to the secondary at high throttle? And is the mileage difference worth going through with the addition care to install and tune it?
More Turbo
Joined: Nov 2015
Posts: 710
Likes: 111
The Edelbrock carburetors are spread bore meaning the primary bores are a lot smaller than the secondary bores so it acts like a small two barrel carburetor until you push the gas pedal enough to open the larger secondaries.
An air/fuel ratio meter has a wide band O2 sensor that installs in the exhaust system and reads the the air/fuel ratio by way of a meter in the drivers compartment.
The AEM meters are preferred.
A lot of members with various carburetors on the Fordsix.com site use them for tuning.
The Edelbrock carburetors come with a good tuning chart so you can make adjustments using their needles and jets.
Try the Edelbrock AVS2 carburetor as is first and see how it works for you.
Which ignition system are you using?
An air/fuel ratio meter has a wide band O2 sensor that installs in the exhaust system and reads the the air/fuel ratio by way of a meter in the drivers compartment.
The AEM meters are preferred.
A lot of members with various carburetors on the Fordsix.com site use them for tuning.
The Edelbrock carburetors come with a good tuning chart so you can make adjustments using their needles and jets.
Try the Edelbrock AVS2 carburetor as is first and see how it works for you.
Which ignition system are you using?
Fleet Mechanic
Joined: Nov 2002
Posts: 1,643
Likes: 69
Here's an interesting explanation of the Autolite 2V:
https://fordsix.com/ci/AutoliteCarbs.html
I would like to dissect your current offshore carb to see why it does not perform up to the Autolite standards. Perhaps corners were cut in its manufacture.
https://fordsix.com/ci/AutoliteCarbs.html
I would like to dissect your current offshore carb to see why it does not perform up to the Autolite standards. Perhaps corners were cut in its manufacture.
Lead Driver
Joined: Mar 2008
Posts: 7,184
Likes: 382
From: Near Los Angeles
Yes, the Edelbrock is a spread bore carb. However, Edelbrock staff insists it is a square bore. I had to compromise with them and say it was a spread bore that bolted up to a square bore manifold. That pacified them. I guess not needing an adapter is a big sales point.
I found the Edelbrock expensive. I bought the tuning kit and a banjo fuel fitting, and the cost was well over $500. I believe they added the annular discharge to compete with the Summit carb. But, with the Summit carb that feature costs $200 less.
I found the Edelbrock expensive. I bought the tuning kit and a banjo fuel fitting, and the cost was well over $500. I believe they added the annular discharge to compete with the Summit carb. But, with the Summit carb that feature costs $200 less.
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