I want to keep my v-belt for accessories, but need a 6 rib pulley also. Is there such thing as a combined v belt and 6 rib pulley? Like, v belt then the serpentine style an inch or so after it.
I have looked all over, and can't find what I'm looking for.
Look for a mid 80s setup like ran on an fbody or truck. The alternator will be a small rib belt with the others being v belt. I reved mine to 6400 rpms and never slung a belt. Works great.
I guess I should have started with what I am attempting to do.
I have a 4 Bolt main 350 in a 1973 C10. It has the usual mods on it: headers, new intake, new Holley, HEI, and old double hump heads. I was going to try the eBay turbo route, this is a toy that I don't want to drop $5k into. I just want the cool factor, and a little extra pep. I decided against the turbo route.
I found I very good deal on 2 M90s. I know a bigger supercharger would be better, but I have wanted to try this for years. It isn't a big concern if the motor let's go on me, but I'm hoping for around 6psi. I don't know if 1 Eaton M90 would do it, without making a ton of heat and grenading. I'm going to buy 2, and sell the other locally if I don't need it for my goals.
I already have a carb for blow through, a wideband, a decent welder, and a machinist friend. Now I'm just adding up all of the components, and submitting my proposal to the boss(my wife). She seems to be ok with the idea if I can keep it around $800. I'll go over, but I'll sneak over it.
I'm debating on buying a fuel pump for an 87 tpi truck also. By my calculations, I need to flow around 55 gallons per hour @ 22 psi. Seems to be near the max for the stock fuel pumps I have found.
The car that the superchargers came off of have a 6 rib pulley on it. A stock 350 pulley size would put me just a hair over the factory ratio on the supercharger, so anything like that will be cheaper than a performance part.
I'm debating on buying a fuel pump for an 87 tpi truck also. By my calculations, I need to flow around 55 gallons per hour @ 22 psi. Seems to be near the max for the stock fuel pumps I have found.
At 0.5 lbs of fuel consumed for each brake horsepower hour, your 55 gallons per hour would theoretically support 660 horsepower, but your idea of applying 22 psi to a Holley will not work.
It is understandable how you can increase power by elevating the fuel pressure with an electronic fuel injection system, but a carburetor has a needle and seat arrangement that opens and closes to allow more or less fuel into the carburetor bowl. The pressure limit on this needle and seat varies, depending on the carburetor design, but a Holley should probably be limited to around 6 psi to prevent overpowering the spring and allowing the fuel pump to blow raw fuel into the intake manifold, thus providing you with a tuning nightmare.
Edelbrock carburetors, along with the old Carter AFB's, will run best with fuel pressure at the bowl being controlled down to 4 1/2 to 5 psi. The old Stromberg carburetors work best at 2-3 psi.
Now, I know that there will be guys who will tell you that you can run 8-10 psi with a Holley and maybe they are able to do that. I'm just telling you that more pressure will not make more horsepower with a carburetor like it will with an electronic fuel injection system. More volume will help, by making the delivery lines as large as possible, but pressure must be contained.
Your best bet is an electric fuel pump mounted close to the tank, with a filter before the pump and a filter after the pump, changed frequently. Run minimum 1/2" diameter lines from the tank to the carburetor and use a high-quality pressure regulator just before the carburetor. I think I would use a system that has a return line from the regulator back to the tank, to prevent dead-heading the pressure and laboring the pump.
I am going to run a regulator, with a return. I have an Edelbrock AFB modded for blow through. The extra pressure is needed to not starve for fuel under boost.
I would rather have too much pump than not enough.
If I need 6 psi for my carb, and run 8psi of boost, I'd need 14psi of fuel pressure to make it still run at 6.
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