Cheap blow thru carb

Cheap blow thru carb DEFAULT


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Defaultcheapest blow-thru carb option

Maybe I'm cheap.

But $ for the highly recommended blow-through carbs seems a bitinsane? (when i barely have that in the total project, so far)

I see mighty demon blow through's for around $, probably used for $



Opinions on the best, cheapest option?
I'm trying to keep this as a budget buildfor my first time, so I can learn the ropes before i invest in good parts that i ruin


I'd be interested in someone that would build me one cheaper - recommendations or ideas?

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you have $ in a turbo or supercharger set up, HOW?

79T/Aman is offline  
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two holset turbo's:
BOV and waste gates:
or so in metal = headers

i bought someone else's turbo project after they got tired of it
so, i'm sure i'm ahead of the game a little
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i have a new demon blow through I am selling, I am selling my whole supercharger kit this is NEVER USED NO GAS IN IT EVER

shipped

Eric

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Quote:

Originally Posted by baron_View Post

Maybe I'm cheap.

But $ for the highly recommended blow-through carbs seems a bitinsane? (when i barely have that in the total project, so far)

I see mighty demon blow through's for around $, probably used for $



Opinions on the best, cheapest option?
I'm trying to keep this as a budget buildfor my first time, so I can learn the ropes before i invest in good parts that i ruin


I'd be interested in someone that would build me one cheaper - recommendations or ideas?

It isn't just the carb. You also get great customer service if you are talking about CSU. Also a FWIW, a carb that has the pontential to support +hp is "cheap" at only $ JMHO.
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I just paid $ for my Pro System carb$ is cheap

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Pontiac Dude's Avatar
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There is plenty of info on modifying a carb for blow thru over the internet. I do them myself and have accumulated tons of info off the net over the years. Personally wouldn't do a demon. I like the holleys.

I recommend a A/F meter or downloadable unit to follow the fuel curve up the rpm as most mods lean out as rpm increases.

I think that Quick fuel now has a blow thru carb new available.

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P dude is right the info is there if you just take the time to look for it.

There is no real magic there just a lot of leg work and some testing.
CSU builds great stuff for the guy who has more money than time but for the rest of us. a simple holley modification is a cheap easy ordeal. under $ will get you up and running.

Hangar 18 has great info I think he even does carbs for people too.
He has shared his info for free for years and I think that should be rewarded.

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old set up LBS 69 firebird T turbo CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, carb 6X-6 heads cc ( unported) TH and gears = @ with a short time = RWHP and HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
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Really good link, great info.
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flynbrian's Avatar
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I paid $ for my Mighty Demon CFM blow throughBrand new.

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That sounds like a good price

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Check out the "look what I bought" thread in this forced induction forum and see what I been up toAbout got my Monte Carlo with the T67 & blo thru just about ready to startjust waiting on a slacker buddy to make a part for me that he owes me(He's a great tig welder and fabricator but slow to work at times. Hopefully it will be running within two weeks.

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Two weeks
We can't wait two weeks to hear how it runs.

We need instant gratification damn it!!
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old set up LBS 69 firebird T turbo CAT H beam rods, stock crank, stock block( 2 bolt) performer intake, carb 6X-6 heads cc ( unported) TH and gears = @ with a short time = RWHP and HP @ the crank

new set up - same but with home ported heads and Gen 7 DFI, my custom SS headers
Jeff Palazzo

Www.pontiaction.net
Www.mayhemturbo.com
turbo69BIRD is offline  
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flynbrian's Avatar
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It runs AWESOME! The tuning and setup for the initial everything was much easier than I expected too!

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Blow-Through Carburetor Selection

When selecting a carburetor for your ProCharged blow-through application, as with naturally aspirated engines, less is generally more. A carburetor can be sized according to your engine’s airflow and resultant power output. Even though a larger than recommended carburetor may offer some increase in peak power, it will likely cause the engine to be less responsive at low RPM and result in drivability unacceptable for cars that will be street driven.

Preparing a carburetor for use in a blow-through application typically involves few, if any modifications. Among those needing no modification are Holley’s HP series carburetors which are designed with no choke assembly and generally equipped with Nitrophyl floats from the factory.

But what if you have Holley’s most popular carb … the Double Pumper? For standard Double Pumper carburetors, the choke assembly should be removed to provide optimal airflow and performance when used with a carburetor bonnet. Additionally, the brass floats (which will collapse under boost) must be replaced with Nitrophyl floats (available from ATI, or Holley). With only the modifications listed above, Holley Double Pumpers (when properly jetted) will typically flow enough fuel to support 1 hp per rated cfm of airflow. Single carburetor applications exceeding 1 hp per rated cfm may require additional modifications such as resizing main wells and power valve restrictions, changing boosters and emulsion circuit recalibration.

Click Here for More Info

Sours: https://www.procharger.com/blog/blow-through-carburetor-selection
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Build a Blow-Through Carb for Less Than $50

| How-To - Engine and Drivetrain

In the electrified and automated world that is , there are a few things that have stood the test of time: chocolate is still mostly sugar, hamburgers (the good ones, anyway) are still made of ground-up cow, and Holley carburetors still do a bang-up job of mixing fuel and air. While electronic fuel injection is a phenomenal addition to any old-timey engine, when it comes to keeping the bucks down and the fun up, there's no beating a good ol' carb—even with boost.

Naturally, to fuel the cheap turbo test mill, it made sense to keep with the DIY theme and modify a carburetor for blow-through application. We're already bracing for the flood of emails subject-lined "Why not use EFI?" that will clog the HOT ROD mailbox for months after this story is published. Are we the crazy ones for still building carburetors in ?

Modifying for Boost

The internet is rife with opinions on what needs to be changed, drilled, plugged, whispered to, and otherwise tickled to make a carburetor work with boost flowing through it. The question is, do any of those tricks work?

We scoured the forums, search engines, and tech articles and cherry-picked the blow-through mods that, in our heads, made the most sense. Knowing what we know about carbs, that meant milling the choke horn, plugging any potential boost leaks (such as the choke linkage pass-through), and opening up the power valve channel restrictions.

It wasn't hard, and when we tested our Franken-carb at Westech, the results were surprisingly, well—good! Did we get lucky? No, there's definitely some science at work here. And, to better understand it, we consulted blow-through-carb guru Kevin Van Noy of Carburetor Solutions Unlimited (CSU).

The Review

We knew our carb worked, based on dyno data, but could it have been better—did we miss an important step? To find out, we asked Van Noy if there was more to a proper blow-through carb than the simple changes we made.

"Those are the most basic mods, kind of what everybody does," Van Noy said. "They usually work well in the lower power ranges," which Van Noy classifies as between to hp—right where our test engine lived.

Power Valves

Past that horsepower level, extra attention becomes necessary to the power valve. Unlike the main jets—which meter fuel in direct response to airflow through the venturis/boosters—a power valve, via manifold vacuum, actually responds to engine load. However, under boost, their job becomes a little muddied.

On CSU carbs, Van Noy utilizes a special "boost-referenced" power valve that—you guessed it—doesn't open until boost hits. These can be adjusted to activate at different boost levels, tailoring the fuel curve appropriately. Also, CSU uses a screw-in restrictor for the power valve channels that makes adjusting them far easier than drilling out a stock metering block.

"Above about 15 pounds, boost pressure in the float bowls can overpower a standard power valve and cause it to close," Van Noy said. He also stresses the use of a wideband air/fuel gauge to monitor exactly what the carb is doing.

Fuel Flow

At higher horsepower levels, flow through the carburetor is also an issue, according to Van Noy. "At about 1, horsepower on pump gas, a single needle can't flow enough fuel," he said. "On E85, it's about to horsepower." The solution is moving up to a float bowl with dual needles and seats.

Check-Ball Removal

Van Noy touched on a subject that we hadn't yet heard of. On many—especially newer series carbs—Holley installed a check-ball that protects the power valve against backfires. "That check-ball can get pushed up by boost, which seals off the power valve feed," Van Noy said. "Then, boost from the float bowl can work against the power valve and shut it, which leans everything out." The remedy is to remove the power valve check-ball (photo 10). "If you're having backfires big enough to hurt the power valve, you have bigger problems."

Carburetor Hats

The best blow-through carb on the market is absolutely useless with a bad carb hat on top of it. Van Noy warns against low-profile hats, especially those that ask the air to turn at a really tight angle. "They choke down the air and don't let it smoothly blow into the venturis," he said. Staying inline with our budget in check, we bought a Spectre single-plenum intake (PN ) from Amazon, along with our turbo kit. It is inches tall and has a 4-inch inlet. Van Noy is familiar with this hat and has found them to work well. Don't confuse it with PN , which is a low-profile version that does not work well at all!

The Conclusion

After building a blow-through carb, consulting the expert on its operation, and testing one on an engine dyno up to hp, do we recommend building your own blow-through carb? You better believe it. With $ in parts invested in the carb, this is one frugal way to get your engine ready for boost. To be fair, if your ride isn't Holley-powered from the get go, you'll need to buy one. A new carb like ours sells for $ on Summit Racing, but we've never been to swap meet that wasn't swarming with carbs ripe for the picking.

Sources

Holley

Holley.com

Westech Performance Group

WestechPerformance.com

Carburetor Solutions Unlimited

CSUcarbs.com

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  • Turbo this setup/blow thru carbs?
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    1. ,  PM#1

    2. ,  AM#2

    3. ,  AM#3

    4. ,  AM#4

      Default

      The biggest limiting factor with a blow-through setup will be controlling detonation. Any time
      you have a wet-flow intake system, you have mixture distribution issues, and adding boost
      certainly doesn't help.
      Cheers,
      Jeff Cook

      '85 GT Hatch, 5-speed T-Top, Eibachs, Konis, & ARE 5-Spokes '85 GT Vert, CFI/AOD, all factory
      '79 Fairmont StaWag, , 62K original miles '04 Azure Blue 40th Anny Mach 1, 37K original miles
      F S-Crew 4x4 "Blue Coyote" 65 coupe, auto, Pony interior '67 coupe 6-cyl 4-speed
      '68 Vert, Mexican block 4-speed '71 Datsun
      And a 1-of Deep Blue Pearl Marauder DOHC, J-Mod, s and Lidio tune

    5. ,  AM#5

    6. ,  AM#6
      FEP Power Member MY 85 GT's Avatar
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      I bought the On3 kit i do have fuel injection but the complete kit is about $ so im sure yours would be lessbecause your Carb
      85 GTSOLD
      GT ConvertibleSOLD
      GT sold.
      GT 5spd SOLD.
      Turbo installed The car is insane!!!!!!
      87 GT Vert.On3 turbo 70mm A/R housing pounds of boost!!! Trickflow TW cc heads,TF street heat intake,70mm TB,stock cam, roller rockers,Snow performance stage 2 meth kit,42# injectors, lph fuel pump,tunning with Moates QH,Art car C4, stall's

    7. ,  AM#7

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      For starters, you will need a single plane intake. Second, I would ditch that E cam and stuff in a stock HO roller cam retarded degrees with some rockers. The E cam will only reduce your spool time and not give you any worthwhile gains. As for the carb, you can buy all the parts and do the mods to your carb yourself, or send it out, or buy one already done. For the turbo, I would stick with something in the 60mm range as that will push enough air to crack the stock block, on the turbine side you'll want a P trim housing with an A/R of to no more than A 3" downpipe will work well with a dual 3" exhaust system. The fuel pump you have is inadequate, and you will also need a boost referenced fuel pressure regulator. You need a pump that will flow enough fuel but be able to push at least lbs of fuel pressure depending on how much boost you want, as the boost pressure in the carb will be trying to overcome the pressure from the fuel pump. Ditch those gears and run s or run a really tall tire, more load is better for the turbos performance.
      Personally, I like the stock EFI MAF setup for a mild turbo application. The factory computer actually does a really good job of handling the fueling needs and you can have amazing driveability. With the carb, if there are wild weather changes then you may have to constantly jet and re-jet.
      Before you make any moves, head to www.theturboforums.com and look up everything you can in the DIY sections. Lots of info there, and some knowledgeable folks.
      GT T-Top , waiting on trans and IRS swap.
      GT Ragtop, , T5, , 03 Cobras with Nittos
      LX Ragtop, , AOD, shift kit, Pony wheels, baby cam, X pipe and Flowbasterds.
      SVO needs TLC

    8. ,  AM#8

      Default

      Quote Originally Posted by fiveoh 86lxView Post
      I obviously know very little about this in general so am not sure of all the routes/options. Are you referring to buying a specific brand of blow through carb?
      It really has nothing to do with the kind of carb you use, so much as it has to do with using
      a carb in the first place. Fuel distribution issues are just a fact of life when the intake manifold
      has to carry both air and fuel. Turbocharging just amplifies those issues.

      IMO, there's a reason why turbocharged gasoline engines never really went mainstream until
      EFI became the norm.
      Cheers,
      Jeff Cook

      '85 GT Hatch, 5-speed T-Top, Eibachs, Konis, & ARE 5-Spokes '85 GT Vert, CFI/AOD, all factory
      '79 Fairmont StaWag, , 62K original miles '04 Azure Blue 40th Anny Mach 1, 37K original miles
      F S-Crew 4x4 "Blue Coyote" 65 coupe, auto, Pony interior '67 coupe 6-cyl 4-speed
      '68 Vert, Mexican block 4-speed '71 Datsun
      And a 1-of Deep Blue Pearl Marauder DOHC, J-Mod, s and Lidio tune

    9. ,  PM#9

    10. ,  PM#10

    11. ,  PM#11

      Default

      I do not claim to be a turbo expert by any means, but I think you might want to look into injection instead of a carb. And this is from a die hard carb guy.
      Mustang G.T. No-option stripper- I like strippers.
      , GT40P heads, Comp Cams XEHR on rockers, TFI spring kit, Weiand blower, Holley mechanical secondarys, Mishimoto radiator, Edelbrock street performer mechanical pump, BBK shortys, T-5 conversion, rear, gears, carbon fiber clutches, SS Machine lowers, Maximum Motorsport XL subframes, "B" springs.

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    13. ,  AM#13
      FEP Power Member MY 85 GT's Avatar
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      My car is getting the On3 kit on nowit is FI thoAnd to be honest with youi would just do an EFI swapi think in the long run it will be a better driving carYou can tune it easier and you wont have to always play with carb adjustments..i think your in for a lot of headaches going turbo and carbJust my centsGood luck with which ever route you go
      85 GTSOLD
      GT ConvertibleSOLD
      GT sold.
      GT 5spd SOLD.
      Turbo installed The car is insane!!!!!!
      87 GT Vert.On3 turbo 70mm A/R housing pounds of boost!!! Trickflow TW cc heads,TF street heat intake,70mm TB,stock cam, roller rockers,Snow performance stage 2 meth kit,42# injectors, lph fuel pump,tunning with Moates QH,Art car C4, stall's

    14. ,  PM#14

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      Yep I could work with you over the winter on building a kit. Your P headers will work flipped forward and plug clearance will be the same as it is now. A stock cam is better suited for the turbo setup then an E, the stock cam will make more power then your block can handle. The carb I built went all summer with no tuning changes and I drove the car alot, only hard thing about using a carb you don't have control over your timing curve unless you spend the money on the proper boxes. EFI is nice and I do have a few tunes I can have burned for your setup. Some cheap simple EFI parts and you can make some power for reasonable money. I have a friends car I built with an all stock longblock, intake and throttle body at hp at the tires on a little over 12psi. Pretty basic setup that works very well. You don't need anything exotic to make the power you want reliably.
      Last edited by Whiplash93; at PM.
      Fairmont wagon ci (stock block), 88mm T6, TH, 9" rear at
      Boxtop w/70mm, at (traction limited) Dart blocked ci, S
      Fairmont 4-door project. rwhp on psi. (SOLD)

    15. ,  PM#15

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    18. ,  PM#18

    19. ,  AM#19
      FEP Power Member MY 85 GT's Avatar
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      Quote Originally Posted by Whiplash93View Post
      Due to lobe seperation the stock cam is a better choice. I've done both carb and EFI, carb is nice because it's very simple to tune it yourself and the initial cost is cheaper. Once EFI is tuned and setup properly the driveability is very nice, low speed and no boost driveabilty is better. Initial costs are higher with EFI also. If it boils down to cost carb is cheaper.
      Yeah im sure the carb route is the cheaper wayBut like you said tho once the EFI is set-up it should be a fun driverplus be pretty consitant day after day no?I cant wait to get mine back its almost done
      85 GTSOLD
      GT ConvertibleSOLD
      GT sold.
      GT 5spd SOLD.
      Turbo installed The car is insane!!!!!!
      87 GT Vert.On3 turbo 70mm A/R housing pounds of boost!!! Trickflow TW cc heads,TF street heat intake,70mm TB,stock cam, roller rockers,Snow performance stage 2 meth kit,42# injectors, lph fuel pump,tunning with Moates QH,Art car C4, stall's

    20. ,  AM#20

    21. ,  PM#21

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      An inline lph would be more then adequate for a blow thru setup, put in place of the red pump. You will have to run a return line to the tank also. Linkage between the vac secondary and dbl pumper are the same. Hangar18 mods are a piece together deal. I've seen used carbs for much cheaper and your going to be rebuilding/modifying it anyway.

      My 85 GT,
      When cost is a concern the carb is by far the cheapest route. A carb does require a little more tinkering but with the normal temprature changes in the summer very little tuning is required, I never had to change my carb once I nailed down the jetting. EFI does have it's advantages but by the time he buys a wiring harness, computer, chip, injectors, pump, intake and all the other items to get it up and running the price goes up alot.
      Fairmont wagon ci (stock block), 88mm T6, TH, 9" rear at
      Boxtop w/70mm, at (traction limited) Dart blocked ci, S
      Fairmont 4-door project. rwhp on psi. (SOLD)

    22. ,  PM#22
      FEP Power Member MY 85 GT's Avatar
      Join Date
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      Belleville, New Jersey.
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      [QUOTE=

      My 85 GT,
      When cost is a concern the carb is by far the cheapest route. A carb does require a little more tinkering but with the normal temprature changes in the summer very little tuning is required, I never had to change my carb once I nailed down the jetting. EFI does have it's advantages but by the time he buys a wiring harness, computer, chip, injectors, pump, intake and all the other items to get it up and running the price goes up alot.[/QUOTE]

      Yeah true my car is already EFI i just had to do a MAF conversion being my car was speed densityI cant wait to get it back should be fun to drive
      85 GTSOLD
      GT ConvertibleSOLD
      GT sold.
      GT 5spd SOLD.
      Turbo installed The car is insane!!!!!!
      87 GT Vert.On3 turbo 70mm A/R housing pounds of boost!!! Trickflow TW cc heads,TF street heat intake,70mm TB,stock cam, roller rockers,Snow performance stage 2 meth kit,42# injectors, lph fuel pump,tunning with Moates QH,Art car C4, stall's

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    Blow thru carb cheap

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    Does a blowthrough Carb need an Intercooler?

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