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XCTB Circle Track Series E85 Carburetor

XCTB Circle Track Carburetors

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XCTB Circle Track Series E85 Carburetor

ATM’s most versatile E85 "circle track" carburetors XCTB Series that feature a 4150-style flange "no vacuum ports" in sizes from 650cfm all the way up to 1050cfm. It is the perfect blend of a precision die cast aluminum ATM™ carb body with ATM 2-circuit, 4-emulsion billet metering blocks and a billet aluminum throttle body. The idle and high-speed air bleeds and the idle fuel feed and power valve channel restrictions can be changed to tailor a precise fuel curve your application.

Incoming fuel is managed by ATM's™ all aluminum dual inlet, dual sight-window fuel bowls with special wedge-shaped floats. They are setup for 7/8”-20 AN #6 fittings that provide a tight, leak-resistant seal.

The billet components add durability for frequent calibration changes and strength for the extreme throttle action associated with racing. E85 XRBs come with a gold corrosion-resistant finished and black anodized billet metering blocks and billet throttle bodies.

Product Details

XCTB Series

E85

ATM Innovation’s XCTB "Circle Track" is a step up from its XCTC series. While it shares many of the same features with the XCTC, the XCTB is intended for racers that frequently take apart their carburetors for precise tuning changes – the billet metering blocks add another level of durability over die cast components. The billet throttle bodies are stronger and more precise too. Plus there is more detail work like “slabbed” throttle shafts that promote smoother flow and less turbulence.

ATM’s XCTB carbs use the ATM™ die cast aluminum carb body that has a fully contoured high-flow air horn and externally changeable idle- and high-speed air bleeds. When combined with ATM’s 2-circuit, 4-emulsion billet metering blocks with 4-corner idle adjustment, the XRB becomes one of the most “tuneable” race carbs on the market. These billet metering blocks also have changeable idle fuel and power valve channel restrictions.

Dynamic fuel handling is important in hard-cornering racecars and ATM’s™ all aluminum dual inlet, dual sight-window fuel bowls were designed exactly for this purpose. They are fitted with the 7/8”-20 AN #6 fittings for leak-resistant connections and special wedge-shaped floats.

All XCTB Series carbs are available for gas, methanol and E85 fuels. E85 XCTBs come with a gold corrosion-resistant finish and black anodized billet metering blocks and billet throttle bodies.

  • ATM™ die cast aluminum main body w/changeable idle- and high-speed air bleeds
  • Billet 2-circuit, 4-emulsion metering blocks
  • 4-corner idle adjustment
  • ATM™ all aluminum dual inlet/dual sight-window fuel bowls & wedge-shaped floats
  • Billet throttle body w/slabbed throttle shafts
  • Available for gas, methanol & E85

Part #: XCTBE

Price: $666.67
Size CFM:
Quantity:

Customer Reviews - 5/5 from 2 reviews Write A Review

Sort Reviews by: Date | Rating Comments

1 5 out of 5 stars by on November 8th 2022

great carb

XCTB Circle Track Series E85 Carburetor

Pros: This is the first carb i have ever had that required no tweaking after install. Bolt it on turned on fuel pump and hit the starter. Fired right up and perfect idle. Didn't even have to touch the accelerator. Took it to the track and ran perfect with one tenth of second faster in the 1/8th mile than my gas carb on 110 fuel. My gas carb was a very responsive carb. I'm running a 434 sbc with 13:1 compression. The new E85 carb is just great. Thanks for a good product

Cons: no Cons that I can think of.

2 5 out of 5 stars by on November 8th 2022

great carb

XCTB Circle Track Series E85 Carburetor

Pros: This is the first carb i have ever had that required no tweaking after install. Bolt it on turned on fuel pump and hit the starter. Fired right up and perfect idle. Didn't even have to touch the accelerator. Took it to the track and ran perfect with one tenth of second faster in the 1/8th mile than my gas carb on 110 fuel. My gas carb was a very responsive carb. I'm running a 434 sbc with 13:1 compression. The new E85 carb is just great. Thanks for a good product

Cons: no Cons that I can think of.

Product Q & A


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