Is there any cheaper alternative to go to rather than the paxton supercharger. That is the only one I can find for a carbed 302. any help is appreciated.
Supercharging!!!????
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joeythesaint
New Member
I've been looking at that same option. Hot rodders, correct if I'm wrong, here, but I'm told that if you supercharge a 302 with a 6:71 series (or bigger) impeller, you'll just "drown" it -- there's not enough air going out to compensate for the air going in.
This is why I'm opting to go with dual 500cfm carbs -- 1000cfm (1000cfm wide open -- 2, 500cfm 4bbls on a progressive linkage) should be plenty; my understanding is that it'll likely be too much without headers. The engine has got to breathe at both ends.
In the meantime, I'm measuring and penciling, trying to imagineer a way to stuff a big-block -- ideally a hemi, which responds spectacularly well to supercharging -- into my II someday.
email me at [email protected] . It looks like we're going in the same direction; I'm all for comparing notes.
This is why I'm opting to go with dual 500cfm carbs -- 1000cfm (1000cfm wide open -- 2, 500cfm 4bbls on a progressive linkage) should be plenty; my understanding is that it'll likely be too much without headers. The engine has got to breathe at both ends.
In the meantime, I'm measuring and penciling, trying to imagineer a way to stuff a big-block -- ideally a hemi, which responds spectacularly well to supercharging -- into my II someday.
email me at [email protected] . It looks like we're going in the same direction; I'm all for comparing notes.
Power Surge
Founding Member
First of all, "cheap" and "supercharger" are not two words that usually go together. If you are not willing to spend what most blowers cost new, look for a decent used kit. You can use any centrifugal blower you want, all you need is the carb box to make it work.
You also can't just slap a blower on any motor. First, it must be healthy. You can put about 6 psi into a healthy stock 302. Second, you need to keep the compression under 9:1 or you won't really be able to use pump gas. If you want to make big power, you should build a blower motor, with fogred pistons, larger ring gaps, and decent flowing heads.
On my brothers pro 74, we just put his new setup in. It's a stock 92 5.0 (we'll build a 347 next winter) with an 8-71 on top. It will make about 5-6 psi. The car previously had dual quads, and ran like crap with them. Dual quads are too much for a stock/mild 302. Using the blower is different, because you are FORCING the air into the motor.
You also can't just slap a blower on any motor. First, it must be healthy. You can put about 6 psi into a healthy stock 302. Second, you need to keep the compression under 9:1 or you won't really be able to use pump gas. If you want to make big power, you should build a blower motor, with fogred pistons, larger ring gaps, and decent flowing heads.
On my brothers pro 74, we just put his new setup in. It's a stock 92 5.0 (we'll build a 347 next winter) with an 8-71 on top. It will make about 5-6 psi. The car previously had dual quads, and ran like crap with them. Dual quads are too much for a stock/mild 302. Using the blower is different, because you are FORCING the air into the motor.
CobraIILover said:
Thanks for the info. I have a 331 stroker kit that I want to build onto a stronger motor, As soon as I find a donor 5.0.
joeythesaint
New Member
> Dual quads are too much for a stock/mild 302.
What size quads was he running, and how were they linked? I've read of impressive results with baby quads -- 500's -- on 302's and 5.0's. I can see twin 750's being too much. I'm not debating you; I really want to know before I get too far into this project.
What size quads was he running, and how were they linked? I've read of impressive results with baby quads -- 500's -- on 302's and 5.0's. I can see twin 750's being too much. I'm not debating you; I really want to know before I get too far into this project.
Power Surge
Founding Member
joeythesaint said:
Hey was running dual 450s. It's was too much for a stock/mild 302. We wound up disconnecting the secondaries and then the car was much better. I think Dano reported that his dual quad setup was a PITA as well, maybe he'll chime in too.
perce111
Founding Member
Back to blowers
A real nice set up is the B&M [now Holley] unit
that they make for the SB Ford. Still must keep
8 or 9:1 compression.
I think from past experience it's not the size [dual 450s]
that is the problem it's multiple carburation that is tough
to syncronize.
Way back we built a tri carb unit for a hemi that ran
3 450 4bbl carbs modified. Talk about a pain to set up LOL.
Later
A real nice set up is the B&M [now Holley] unit
that they make for the SB Ford. Still must keep
8 or 9:1 compression.
I think from past experience it's not the size [dual 450s]
that is the problem it's multiple carburation that is tough
to syncronize.
Way back we built a tri carb unit for a hemi that ran
3 450 4bbl carbs modified. Talk about a pain to set up LOL.
Later
jeffnoel
Founding Member
parthos
Founding Member
a key issue to keep in mind is pulley depth. I've a few different setups on other 302s, and 5.0s, and what is kinda scary is the pulley on the crank, it's pretty long.
Mstng2
Founding Member
The holley baby blower (roots style) is very nice. I like the setup better and it doesnt require a lot of routing and plumbing. Drop it on, reconfigure the belts and VAVOOM!! Pricewise it's 6's gonna cost you about 3-5 K no matter which way you go. On carbs, most people go way too big on carb's I thought I would drop a 750 CFM on and go faster... lost 2 10ths in the 1/4...DOH!! 
too much gas! Anyway just my 2 pennies.
too much gas! Anyway just my 2 pennies.this is a simple rume of thumb on carb size. Displacement multiplied by 1.5 to 2. Stay closer to the 1.5 to maintian fuel eficiency or get closer to 2 for maximum performance. This is for normally asperiated engines.
As for supercharging I have looked into several of the kits avaible for my EFI 5.0 and I don't think I have the belt clearence for any of them. Reacentely I saw a pair of headders that are reversed to come forward and mount a turbo from the 2.3's. I think I can build a twin turbo kit using salvage yard parts for under $1000.00. The cool part is that I won't have to worry about headder clearence problems because of my AOD.
As for supercharging I have looked into several of the kits avaible for my EFI 5.0 and I don't think I have the belt clearence for any of them. Reacentely I saw a pair of headders that are reversed to come forward and mount a turbo from the 2.3's. I think I can build a twin turbo kit using salvage yard parts for under $1000.00. The cool part is that I won't have to worry about headder clearence problems because of my AOD.
98CobraClone
New Member
It's my understanding that procharger is testing a carbed setup. Once my V6 poops out, I might get the mounting brackets for a 302 and try it on the cobra. I already know that they produce and sell the carburetor hoods, but getting the piping to run through the SC, and intercooler to the carb would be a pain. At least with a big open grill area of the II, the intercooler would get plenty of air.
I'm just partial to intercoolers now. I'm pretty sure they can be mounted horizontal (parallel with ground) and get an air scoop for it to force ground air into it. I'm still playing with that idea.
I'm just partial to intercoolers now. I'm pretty sure they can be mounted horizontal (parallel with ground) and get an air scoop for it to force ground air into it. I'm still playing with that idea.
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