Watch CSU Build a 1,000-plus Horsepower Blow-Through Carb
It was not even 10 years ago that the concept of a 1,000 horsepower street car was a mind boggling proposition. Now, anything less than quadruple-digit power barely makes news. While EFI is more user friendly and certainly more accessible than ever before, there is no disputing the simplicity and functionality of a carburetor.
But, when that carburetor is going to be tasked to handle a blow-through application exceeding 1,300 horsepower well, that's what Kevin Van Noy at CSU carbs in Fontana has been specializing in for over 15 years. Big power and alternative fuels, such as E85 and methanol, require significantly higher fuel flow than your run-of-the-mill carb can handle and Van Noy has a few tricks to make them possible.
The base carburetor for this project is Holley's 950 CFM Ultra XP (PN 0-80805BKX) that will be treated to a performance makeover by CSU. A mechanical secondary carburetor is a requirement for any blow through build as you want to set the linkage to open at almost a 1:1 rate. Van Noy is mainly a one-man band working out of his garage in Fontana and his shop is surprisingly devoid of the special gadgetry one might've expected a carburetor magician to have. Drill bits in 1/64th increments along with a mill and a few jigs are the only tools Kevin needs to complete virtually any carburetor build.
The key to a proper blow through setup comes down to three aspects the power valve, the boosters, and a strong understanding of how to set everything up. The most important part of the build is Van Noy's unique power valve design, which he calls a, "Simple one-way valve." "The more pressure you put on them, the further they get pushed open and they are easily adjusted. The progressive power valve allows the fuel curve to better reference boost pressure. "For this build we will set the primaries at five psi of boost and the secondaries at seven."
The next area needing attention is the needle and seats. Van Noy says around 900 horsepower at the crank on E85, or about 1,200 horsepower on gasoline, is when the factory single needle and seat cannot flow enough fuel. His solution is to upgrade to dual needle and seat bowls. This configuration can flow twice as much fuel to the bowls and holds around 50 percent more fuel than the XP's already expanded bowl size. The jets can be removed from the access holes on the front for quick tuning changes. A pair of 50cc accelerator pumps provide adequate pump shots for boost, and are bolstered with thicker pump arms to keep from bending against pressure in the bowls.
What's the most common question Van Noy gets? "How do they drive on the street?" "I always respond with 'beautifully,'" he says. "It really comes down to calibrating everything right and having the proper jetting in the idle circuit. Between that and the transfer slot, that's most of your drivability."
Assembly First Starts at Disassembly
Source:
Carburetor Solutions Unlimited
909-851-6955
csucarbs.com
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E85 blow through carb tuning#2147082
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For Eric at horsepower invitations he did my carb for my slant and out of the box it worked flawless it wasnt till i got over 15psi did i have to make any changes and one phone call to Eric and a jet change later and my lean spot went away.
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Moderated by Al_Alguire, Hotwheelsjr, McLovin, moparts, not_a_charger, tboomer
Q-Series 750CFM Drag Race Blow-Thru Annular Booster E85
Ideally suited for bracket racers and weekend warriors alike, Q-Series carburetors are purpose-built for the dragstrip. To combat the g's experienced during hard launches, Q-Series carbs are equipped with notched floats and secondary jet extensions. The high-flow aluminum main body isn't just lightweight, but it also features recessed air bleed cavities for improved air flow. Die-cast venturi are machined to exacting tolerances for outstanding throttle response. Billet metering blocks ensure a uniform fuel curve, while throttle-bodies enhance durability. For those days when track conditions vary from one pass to the next, QFT's QuickLink system makes adjusting the secondaries easy on models equipped with mechanical secondaries. The Q-Series is our most comprehensive line of carburetors, with applications available for use with gasoline, methanol, and E85 fuels, forced induction, drag race, circle track, and comes in both vacuum and mechanical secondary models. •Lightweight aluminum main body •Vacuum and mechanical secondary models available •Aluminum fuel bowls with dual sight glass windows •Billet metering blocks with 4-corner idle system •Changeable idle feed and power valve channel restrictions •Billet aluminum throttle body provides exceptional precision and strength •PTFE coated and sealed shafts
About Quick Fuel
“Innovators in fuel systems” is more than just a by-line. Since 1998, Quick Fuel Technology has grown exponentially culminating in the benchmark by which performance carburetors are measured. At QFT, our product innovation is only matched by our customer service.
E85 is getting to be more and more popular in Blow thru applications. Theres more to an E85 carb than just increasing fuel passages to flow more fuel. E85 is a trickier fuel than gasoline and requires even more precise calibrations and air bleed controlled metering programs to operate properly.
We've spent several years perfecting our E85 design before releasing it and its now available.
E85 is getting to be more and more popular in Blow thru applications. Theres more to an E85 carb than just increasing fuel passages to flow more fuel. E85 is a trickier fuel than gasoline and requires even more precise calibrations and air bleed controlled metering programs to operate properly.
We've spent several years perfecting our E85 design before releasing it and its now available.
Our E85 Blow thru carburetor design works similar to our gasoline version. It does not rely on sensitive boost pressured adjustable power valves to provide its metering. Our design uses properly sized and tapered metering passages to calibrate the fuel and this also allows it to self compensate for varying boost levels. A proper metering design increases the carburetors reliability, its repeatability as well as improves the users ability to rely on the design to perform every pass down the track.
Prices starting at $1290.00 (as shown)
For more information, visit www.prosystemsracing.com
Carburetor through e85 blow
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