Momar

I have been looking into what it takes to supercharge a carbed motor. I will not have enough clearance for a roots blower so it is pretty much out of the question.

I was looking at the vortech setup and it looks pretty nice. I know that for blow through setups it usually requires more special work done to the carb. My question is what stuff would need to be done if it was in an enclosure such as the vortech setup? What extra would have to be done if I used just a hat? I have a speed demon 750 dp for what its worth.

I have not decided for sure exactly what the motor I will build will be. I have a high nickle 350 in the garage that I was considering building a solid lifter 383 out of. I already have hooker LT's and a set of ported wp sportsman II's. I would probably be using a vic jr intake. I might be able to get a deal on a world motown block though, and if I can I may go w/ somewhere between a 400 and a 427. I dont think that matters to much for my questions, but it gives you an idea at what I am considering.

I was also wondering what is needed as far as a pulley setup for the vortech setup for carbs?

Thanks

Ben

Momar

Anybody? I have searched, and have not found anything that really tells me what I am wanting.

Thanks

Ben

JoBy

You must modify the fuel pump to keep the fuel pressure constant over the boost pressure.

You might need to change the floats in the carb. You need solid ones that can not compress during boost.

With an enclosure that is probably all you have to modify.

With a hat you need to modify the carb so that the floats chamber see boost pressure.

unknown_host

iTrader: (1)

You will need a boost referenced fuel pump/regulator. ATI sells a mechanical version that is supposed to be good up to 500 hp, I would hope you want more than that tho .

Momar

This is all long range plans because I don’t make enough money to do it quickly, but hope to at least get started soon.

As far as the carb mods, those sound simple enough. I would not have a problem going w/ an electric pump if it is required to make the power(and yes, if I decide to go w/ a supercharged motor I want more than 500 even if it is only a 350 I have a set of World sportsman II’s that I plan on using on an N/A 350 in the mean time that I ported. I have talked to a guy that used these heads, and an solid isky cam that I was looking at and made 500 out of a 350. I would probably be doing something to that extreem and go w/ larger cubic inches if I go naturally aspirated. I don’t know if I will use those heads if I go through the trouble/cost of building a supercharged motor or not though.). One of you said that the pump needs to be modified so that the pressure stays the same, and the other said that it needs to be boost referenced? Does the pressure need to go up w/ boost, or is it supposed to stay the same? How does this work? What would be a good pump and regulator for this? What kind of pressure levels are recommended? Would the vortech carb kit include any of this. I take it that putting the making it so that the fuel bowl sees boost pressure helps keep the fuel ratio constant? With it using the extra fuel then the pump needs to pump more fuel to keep it full? Is that how this works? What other tuning issues will there be w/ a blow through setup?

I was kind of looking at the T trim kit. Does that sound like a good choice?

Thanks

Ben

JoBy

What I said was that the fuel pressure must be constant OVER the boost pressure. So yes, fuel pressure must go up with the boost.

An easy way to do it is to use an electrical fuel pump and a boost referenced fuel pressure regulator.

sleepybu

a carter 120 mechanical will suport mid 10s when modded for boost

Momar

Actually, the pump I have now is a 8(maybe 8.5, I don’t remember for sure) psi carter mechanical 120. What has to be modified, or does it just require a special regulator.

sleepybu

thats the one

you hook a hose from the vent on the pump too the carb box in your case...

http://www.boostedhorsepower.com/Blowthru/Forums/

good info here...look under Budget Twin Turbo 351w

http://www.toohighpsi.com/

Momar

Wow, thats cool. I noticed that he is running an injector to add fuel also though. Would the boost referenced pump be enough w/ a supercharger since the boost climbs slower? Looks like he had one of the cheaper fast cars I have seen. I have seen that page before, but didnt see how they did the pump before.

Ben

sleepybu

When he put that combo in his capri they went with out the injector.

You'll be fine without the injector and it'll be less stuff to go rong

1982TA

iTrader: (1)

I'm thinking of a similar project. Here is a link where a guy turbocharged a Pontiac 455 that might help. No vortech but It's pretty much the same basic principal.

http://www.highperformancepontiac.co...0309pon_turbo/