The Dark Side: V8, V6 & 4 Cylinder Engine Conversions and related radical modifications (brakes, transmission, suspension, drivetrain) for MGB, MGA, Midget and all other MG models. Purists beware!
What do I need to start thinking about if I plan a centrifigal style Super charger.
Do I need a carb box?
A new carb?
what about any pressure valves?
Pulley size?
Fuel pump requirments?
Ignition requiremnts?
I have been surfing quite a bit and will go the Centrifigal style for cost and size reasons. But need to know what is the basic requiments for construction?
Dennis there are a couple of ways to add a supercharger using a carb. If you pressurize the carb then you will either need a carb box or at least tap the car bowl vents to the pressurized air so that you don't blow the gas out of the bowls. You'll also probably need an pressure sensing fuel pressure regulator and a higher pressure pump. You can use a draw through system, but these are usually harder starting and have some other problems related to lag and mixture regulation. Blowers work so much better with fuel injection, but that's not always and option. As to the size of blower you would need for the 302 as well as recomendations on pulley size etc, I'd check with the guys at Vortech and see what they recommend. Probably the same setup they'd use on a Mustang. http://www.vortechsuperchargers.com/
Blow through Super Chariging is the way to go. Box as a Paxton takes less work but less power and harder to tune. The only box (presure type) Super Charger made is from Vortec and they are changing to Blow Through.
1. Need a modified Carb. some say a HP Holley will work fine and it could but.....
The carb shoudl be mofied by specialty shop such as the Carb shop in Ca. The best in the world and that is exageration as they ship all over the world, Waiting time 4-8 weeks, the carbe will be dyno to your engine specs, cost around $800 inlcudes the carb.
2. You will need a fuel pump, high pressure 40 lb + a vacuum control regulator 1:1 ratio, this will supply the carb with the fule needed 1 lb of pressure per 1 psi
Also a fuel return to the tank.
3. you will need a fuel log, you can make one or buy one.
4. You will need a by-pass valve if over 5 psi. The function of this valve is to exhaust the air that can no go through the car when the throtle plates are closed, the air need to go somewhere, the high pressure air can hurt the vanes on the Super Charger. I like to route the air right back into the intake.
4. Crank pulley should as large as you can fit 6" to 7" is the norm.
Super Charger pulley size depends on the manufacturer, the smaller the more psi the impeller in the supoer charger will turn faster, thus more air.
5. Need a vacuum/Boost gauge and a Fuel ratio gauge (otptional)
6. discard your vacuum advance. Super chargers like alot of initial timing but no pining, this will destroy your engine.
7. Need a set of 2 step colder plugs and the a good ignition, such as MSD-A etc.
8.If the information you gave the Carb shop is correct, then only the idle needs to be adjsuted.
9. Keep your bosst to no ore than 7 psi 6 is better. unless you build an specific engine, HD rods, forge pistons, O ring heads or copper gaskets which are special made for super chargers with more than 7 psi.
Vortec V5-G with 2.4 pulley develops about 6psi at 4700k rpm or V6-G 7 psi + 4700K rpm or their new one which is V1-SC 4400K rpm 7 psi but produces the most hp due to the charge maping, this adds about 250+ hp and its big double blade impeller
Procharger The C-2 makes decdent hp about 160 hp on 7 psi I had one of this on a small block chevy 355 ci stock cam it made 383 rwhp from 220
Procharger has an oil cavity so np pluming is needed, just fill and go, it is also gear driven same ad the Vortech.
F-3 This one makes a ton of hp not rare to see one of this in a Chevy big block producing 1000 + hp
Cost of a Super Charger? used one for around $600 to $1200 blower only sometimes as a kit.
There are others but you will need to do lots of work to install. You will still need to make all of your brackets, pulley arrangement etc.
Superchargers works best with stock cams or cams with no more than 112 LS and 220 duration @.050
Most improtan is your AF air fuel calibration.
Supercharging is the best way to TORQUE and hp.
If you call Procharger, the first question is "How much hp do you want to make"
Keep in mind the more hp you develop the more fuel it will take.
I like to use Aeromotive pumps and regulators, forget the 14-30 psi Holley pumps they will not work on a centrifugal supercharger.
Procharger
Meant to say---------Procharger can supplied the carb bonnet thye have 2 one is 2.75" tall and the ohter is 2" cost about $130. The bonnet is no just anything that fits the carb.
The nice thing about centrifugal vblowers is that they run great druing cruising about 1psi they work until they are spool-uo about 2500 rpm with no lag like a turbo.
Fuel Injection Centrifugal Charger is titally different. You will need an aftermarket computer and 2 or 3 bar map and a booster pump besides the FI fuel pump.
The norm is 10% increasein hp per 1 psi of boost,that is one formula.
aAnother formula is Mutiply 1.5 X your present hp. Be honest and you will get honest hp #"s Example 160 rwh X 1.5 (6psi) =240 160 X 1.58 (7 psi) =252.8 same as 253 hp
Big block Chevy with 500 rwhp X 1.9 (12 psi) = 950 hp This isnot rare on the street. You can get the picture, that is why I like centrifugal Super Chargers
Bill your the man. Alott of great info.
If I go the box route do I need a new carb? or how do I utilize mine?
I have a 200 GPH 7-14psi pump should that work?
What you think about Ebay item #190208528394 I am watchin it as well as a Carb Box real cheap
That Super charger is about 3-5 psi which is plenty for a street vehicle.
No pulley, and what is the condition of the impeller and bearings.
BE-- careful!! You can get parts (maybe) from Vortec, Vortec bought Paxton.
Bill what about my other questions? you wealth of knowledge you..
Going to a box type requires the carb to seal and lots of problem arises from that type, tuning etc. Vacuum draws the fuel and air from the box and it creates a few problems. Vortec made lots of progress with the Paxton type but they are going to blow through also. they already have the first kit for big blocks and more coming.
Blow though is the way to go. That blower on e-bay can be use as a blow through system. It is also a pedastal mount similar to the old style AC units. Not a good way to mount, it would require a sturdy flat mount, no flexing at all or you will loose belts.
I know what you mean. Hopefully, my driveshaft will be done this weekend, and I can take her on her maiden voyage.
Brad
It won't be fast enough Brad. Well, maybe for the first few weeks (or months, or years, or decades) but ultimately? Nah!
But I gotta ask Dennis, what are you going to do when the blower isn't enough? (I *could* make a suggestion...)
Jim
Dennis, there are some used Prochargers blowers for sale at a shop near by. I am going to check them out. This blowers are C-2's they came out off Vettes, then went to larger type. I will see what kind of price they want.
If interested e-mail.
More power !!!!!
Just add more boost !!! from 5-6 to 9-12 is a huge increase in torque and hp.
Not enough,
Then.....rebuild the engine, Forge pistons, stronger rods, Permatex head gasket or O rings, lower the compression to about 8:1 and add 15-30 psi and maybe some nitros for added 200+ hp. If that is not enough for a B, then by a solid fuel rocket and attached it to your back and kiss the world good by.
I am bidding on the same blower again and may win this one. Any ideas on pully size? If I go to Vortec site this is there set up and engineering is there a rule of thumb for pulley size?