top hat carb supercharger

[suspect]

i know there's atleast one guy on here running one of these carburetor superchargers, but i just can't track him down to ask a few questions.

http://www.summitracing.com/parts/VOR-4GP218-050L/

with 5 lb of boost, i'm not sure if it's even worth the money.

if there's anyone else using one, i would appreciate some basic information just to see if i need to move on from this idea.

of course, is there anything about it that you like/dislike?
what size of engine do you have and the gas mileage?
what CC heads are you running? and cam grind?
what kind of power/torque are you getting?

i've got a 69 c10 swb. it's not my daily driver, but i will want to drive it to truck shows. from oklahoma to tennessee & vegas. that would be about 2,000 mi round trip. gas mileage on a carb'd engine will be tough enough, so i don't want to bring that down anymore than i need to.

anything else you want to say would be cool too.
thanks, daniel

[suspect]

i forgot to add. 350 w/auto......probably 700r4

[GMR-PERFORMANCE]

Well the blow through carb has a few issues as it hard on the seals. On a 302 ford with that set up it ran well, but that set up was plauged with carb seal issues. Power wise i feel there are better units out there today. That system is rather old, was very popular in the earl carb mustang crowd... The compressor is a good unit, the 5 psi of boost is rather low 7-9 is where most of the newer systems run. But I would think the power gain to be in the 35% range honest gain that is LOL the 302 had gt heads and the B cam in it.

[BigDan3131]

Why not just go with a 6-71 and a pair of 600 cfm carbs? Since you seem to want the look more than the power it would be fine. You can get decent gas mileage if you keep your foot out of it.

[suspect]

thanks for the replies. i'm sure i'll move on from this idea. i'll give the 6-71 some thought, however, if hood clearance is an issue with it then that idea will be gone. i refuse to put a hood scoop on my truck.

i'm just tossing different ideas around. i'm also eyeballing the fast efi conversion.

http://www.summitracing.com/parts/FS...-KIT/?rtype=10

the only thing that scares me about this set up is seeing the word "speed density". hopefully this is something different than what i'm comparing it to. years ago when i was into fox body mustangs, i had an 87 gt. it was a speed density car, no MAF and it was a dog. no power at all. i took off all the fuel injected stuff and put on a holley 750 and it opened up that little 302. i couldn't believe it. now i get the shivers when i hear speed density.

[Boostedbowtie]

Originally Posted by GMR-PERFORMANCE

Well the blow through carb has a few issues as it hard on the seals. .

Hard on what seals ?

[GMR-PERFORMANCE]

a blow through carb is set up to take boost psi thus it gets a few mods done to it. we saw a issue with shafts seals leaking under boost.

[Boostedbowtie]

Oh .....ok

Should be minimal . Whos carb ?

[GMR-PERFORMANCE]

this was a paxton kit with a holley... and once it leaks the off boost street driving sucks as the shafts then suck air. I have ton a bunch of turbo sets as well and I like a draw through set up. but thats just me.

Try to tune a carb with leaking shaft seals,

As for a loss of 2 lbs of boost I would not look at in a good view.. Not trying to stir the pot , only stating what I have seen and delt with first hand. I am sure that others have used it and it works fine. That was then and this is now maybe the new kit has more to offer..

BTW it was when I lived in Altamonte Springs HA HA funny, that was back when the super trooper ( ex FHP car) was killing it out at the track.. That would have been back in the early 90's , seems like a life time ago now.

[Boostedbowtie]

Oh ok . Its not a " real" blow-thru . lol

I've got a Carb Shop Carb with a few unique tricks on it . I use a power valve set-up that uses air pressure from an on-board air system . A turbo car doesnt need the fuel during vacuum and it will actually hurt spool . So you need a PV that opens in boost . CSU carbs have a very good BRPV that works with fuel pressure from the bowls to push on the diaphragm and is adjustable . C&S uses hat pressure through the main body to the power valve cavity . A standard PV can have problems opening because fuel bowl pressure is higher than the pressure it can get though the baseplate .

I reference mine through the side of the main body and into the PV cavity . The PV spring is taken off and put on the outside and has a spring retainer to hold the spring . Now the spring holds the PV closed and the only way it will open is when I tell it to . I use a boost switch to open a solenoid at the pressure I want .

I could go on for hours about this , but I'll stop short . lol But it works very well . Just food for thought ..... I have 68/70 jetting with .081 pvcrs and my 750 Holley supports over 1000hp .

The other big advantage to using a PV deal like this is ... you can keep them closed on the transbrake while building boost . I open my PVs at 6psi and the truck leaves on 7psi .

Got a pic of my blow-thru . Just had it powder coated . The solenoids on the front of the manifold is for the boost controller . I just tee into that for the air source . ( 40psi from on-board air )

Sorry for the long post .

[Boostedbowtie]

Originally Posted by GMR-PERFORMANCE

BTW it was when I lived in Altamonte Springs HA HA funny, that was back when the super trooper ( ex FHP car) was killing it out at the track.. That would have been back in the early 90's , seems like a life time ago now.

I had to think about it , and I think I remember the car . Yes , its been awhile .

I think my truck was running a TBI with a 100 shot back then . Maybe even just motor . All I remeber is it was slow . lol

[GMR-PERFORMANCE]

ok how about the really old guy( at least thats whatg I thought back then) in the 86?? firebird I think it was gold, anyways heavy on the bottle and man that old guy was FASSSST.. And low budget that was his goal.... If it was cheap than he used it. I recall him telling me about getting the aluminum spare tires for the front and how you could shave off a 1/2 of weight after you got them re worked LOL

His home made ram air set up had both head light buckets up and the lights out and dryer vent tube with a "y" in it to force feed the air cleaner. Car had a junk yard 400 in it, I think he bought it from the salavage yard just up the road with the speed way..

Good times, he helped me a ton get my chit squared away.. I could go on for hours about him.. He had piled of worn out struts that he was always playing with for the front and he would drill them out and replace the oil and then put a pipe plug in them.. no kidding..

[Boostedbowtie]

Nope dont remember him , but I dont remember much from back then ..........wait it wasnt that long ago . lol