86Stevo

i have been throwing around the idea about turbocharging my camaro.

i would rather turbo then supercharged 1 to be different and 2 because i have more access to pipe benders and welders and would be cheaper for me to buy a turbo instead of a supercharger

i currently have a 600 perfermer eldbrock carb and i have looked for blowthru carbs but ive seen like 800$ price tags on them

then i came across a artical that you can modify a non blowthru carb to be blowthru

was wondering what it would take to do so if possible ?

im only thinking about running about 6psi of boost any ways not much just to say its turbocharged

oh and idk if it makes a differance or not but it will have a intercooler on it also i no some people dont run them but i will

Street Lethal

iTrader: (16)

Converting your Edelbrock is very easy to do, it is just a matter of replacing the accelerator pump with and Edelbrock Marine Pump Kit w/0-ring style seal and retainer, grafting your own nitrophyl floats w/stock float arms onto thermoquad nitrophyl floats, air sealing the throttle shafts using a dremel (if your interested, I will explain further), and installing the correct needle and seats for your particular application....

86Stevo

man thats awesome to here. my brother has a dremil tool so thats good to know if you can send me some instructions on how to ill get a start on it.
i wouldnt be putting it together anyway until winter time so just gathering up info now.

86Stevo

oh also notice your out by oldridge NJ man im up at hackettstown by island dragway not to far away

Street Lethal

iTrader: (16)

If you can make it down, we're headed over to e-town tomorrow night. We were going to go to Atco tonight but it rained out. The accelerator pump kit is the one for marine applications, and the thermoquad floats are part number CF252 (Borg Warner). When you dremel, your going to direct the air from the underside of the carburetor for the throttle shafts back up to the carburetor bonnet (an enclosure is no longer needed)....

Will put up pics of the process shortly for you....

86Stevo

thanks for the help man i got plans tomorrow night but maybe sometime ill swing down n hit up englishtown me and few buddies maybe i can talk them into taking the drive down and hit up the track ill deff let you know when tho

freaky

i'd like to get those instructions also ...

89fbrestor

streetlethal feel free to go into more detail that was good stuff and id love to know more as well or maybe see some pics. good question 86stevo.

thanks

Street Lethal

iTrader: (16)

I'm eventually going to start a thread and convert one for everyone to see, then slap it on an engine and bring it over to the dyno. However for now, I'll post the pictures of the process that were shared a few years back. Note that the next post after this one will include the dremel work shots underneath the carb, as I can only post eight pictures per post....

Marine Accelerator Pump Seal....



Float Mod Using Thermoquad Floats p/n CF252 (Borg Warner)....



Floats w/High-Flow Needles and Seats....



Choke Plate and Air Horn....



Additional Air Horn Detail....





Primary Air Bleed Mod Using Piano Wire....



Secondary Air Bleed Mod Using Piano Wire....

Street Lethal

iTrader: (16)

Throttle Shaft Sealing After Dremel Work....

freaky

thanks

89fbrestor

very very cool thanks. I'm thinking about boosting a carb build I'm doing right now and this was one of the big concerns i had. i know you can buy them, but a blowthrough carb is easily $700 + so this is awesome.

89fbrestor

quick question lethal or anyone else who might know about this process. does anyone offer a do it yourself all n one kit for this? i know theirs lots of do it yourself guys at the track that would rather wrench on it then pay for one or have someone do it for them... just curious.

thanks

86Stevo

awesome man but im a little lost on what the piano wire is used for ? and the dremal tool what exactly are you shaving down ?

( haven't really looked to much under my carb i just unboxed it bolted it on and haven't seen the bottom since)

Drac0nic

The piano wire reduces the area of the air bleeds. This prevents it from going lean under boost I believe.

The cuts are on the bottom, where the throttle shafts are. They pressurize the shafts so that when you're under boost it doesn't force fuel/boost from them just boost. It keeps the fuel in the carb and off your engine.

86Stevo

ok cool so just make the bottem of the carb nice and flat? and wire up the piano wire and all set to go?


i just might start ordering up some parts to turbo my car soon then new winter project

Street Lethal

iTrader: (16)

I'm including a Carter 600 w/manual choke as part of a package deal for a manifold that I am selling, so if anyone is interested in converting an Edelbrock/Carter carburetor for boost, take a peek because all of these parts will work with a boosted carb....

https://www.thirdgen.org/forums/engi...ml#post5050587

83 Crossfire TA

iTrader: (2)

Did you ever start this thread?

I'm assuming that you replace the stock needle and seat with edelbrock's 1466 high flow ones?

Do you just set the float level to the stock setting (it's literally a 7/16" space from the top of the carb housing to the top of the float, so if you cut and attach a different float to it I'm not sure that you're going to get the level set accurately, though I'm not sure how important it is)?

I"m not sure I entirely understand this, but it always seems to be part of making a carb work with boost. What I do understand is that you're cutting the choke 'tower' off of the top of the carb, I've heard the explination being to prevent the boost closing off the choke plate, and I can guess that the tower assembly above the carb leads to some funky airflow so you cut it off.

I guess my problem is so how do you start the car when it's cold? Do you prime the heck out of it with the accelerator pump and then just not drive till it warms up or what?

Also, what do you do with the choak linkage? If I remember right it interacts with the secondary throttle shaft and without it moving you can't fully open the secondarys...

Does anything have to be done to make the weighted secondarys work?

this makes sense, what size piano wire? Would cutting/tapping them for screw in bleeds or even something like N2O jets work? For that matter, all you're doing is preventing the air bleed from bypassing air past the boosters at high rpm, making the mixture richer at high rpm. I'm wondering if you can block them off completely.

83 Crossfire TA

iTrader: (2)

Those pics are very hard to see, and I guess I don't feel that your description is clear:

• did you drill holes into the base till you it the throttle shafts? I'm guessing that's the point of this. Did you pull the shafts first?
• is that passage across the bottom exposed to air above the boosters? If not where does this get pressurized air from?
• why do you connect the 2 sides of the bottom passage?

Street Lethal

iTrader: (16)

I never started that thread because I stood with Tuned Port Injection, and eventually sold off all of my carburetor stuff. Pictures can always be saved to your hard drive and then edited to increase the brightness. The piano wire size ranges depending on the particular setup, as they would need to be changed in accordance with how much the engine essentially needs through the tuning. The float level is exactly the same, we just needed to swap the type of float being used because the stock one will eventually crush like a tin can under pressure, but it is important that it initially remains as stock, then adjusted later on when you begin tuning. You can use an electric choke if you need to, those mods that were done above were just to embellish the greatest amount of cfm possible, but the electric choke works fine on both Edelbrocks and Quadrajets under boost. The carburetor above, I believe, received a manual choke controlled from inside of the vehicle. The weighted floats also vary depending on the engine and tuning, as we essentially used the stock one at first to get an idea of what the engine liked, and where it needed to be, then swap them depending on if you needed more, or less. I don't know if anyone makes aftermarket weighted secondaries anymore, but mine went with the carb when I sold it...