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Old 07-12-2010, 12:59 PM
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Mechanical secondaries on a 3600 lbs pickup?

Hey I was just wondering what of kind luck people are having running mechanical secondaries carb on cars or trucks in the 3600 lbs weight range. 3800 lbs if im in the drivers seat.

Im Running a 383 stroker, performer rpm heads, rpm air gap intake.
234/238 at .50, 296/300 advertized, with .539/.548 lift hydraulic roller.
auto trans with 2800 stall, 3.73 gears and 30" tires.

Quickfuel recommended a 750 double pumper right off the hop and it suprised me cause I was already planning to buy a Vac secondaries so now im a little undecided.

So, what are you guys running compairably and how do ya like it? Im not a novice when it comes to tuning so im not afraid to get a mechanical secondary to work right, I just thought they were a poor choice on a truck like mine.

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Old 07-12-2010, 01:41 PM
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Your gears and TC stall on the conservative side, but other than that, the power to weight says to me you're safely in DP country.

A DP will work on darned near any engine/vehicle combo- BUT they require that you actually drive the car- not just mat the throttle and wait for the vacuum secondaries to save your bacon. But driven w/finesse, there's no reason your set-up couldn't use a DP carb to excellent effect, IMO.

I suspect others' opinions may well differ, and I have no problem w/that.
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Old 07-12-2010, 01:54 PM
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Sounds cool. Holley, demon, and quickfuel all seem to say that a mechancial secondary carb will live pretty good in this pickup but I want to see how guys like me like these things. Im almost temped to buy 2 carbs and do some learning before I sell one off or keep both, its just such an expensive way to figure it out.
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Old 07-12-2010, 02:36 PM
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Well hello yourself...from Bangladesh, me thinks me smells a troll.
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Old 07-12-2010, 02:53 PM
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Under cover spamer!

He's Baaaack....!

What kind of a 3600lb pick-up are you talking about? You'e got me by 1.200lbs over my 3/4 ton long bed. With out me in it.

Any one want to bet on another "demon run's rich at idle" thread?

Do not open Bangla's link. He worming his way in on high traffic web sites to collect e-mail addresses for spam. If you don't believe me, open it and then start watching the junk e-mail grow to crazy proportions. You've been warned.

Last edited by sqzbox; 07-12-2010 at 03:04 PM.
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Old 07-13-2010, 01:00 AM
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57 chevy body on a 70 P/U frame. been working on it for bout 8 years now between trips to university so its been a slow process, but I build everything myself I put my old quadrajet on my engine too to see if that would solve my stalling issues I talked bout in my last thread. well anyways that cleared up that problem so new carb here I come!

And I had heard more bad than good bout demon. Im sorta thinking I like the quickfuel units.
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Old 07-13-2010, 07:28 AM
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That looks Nice! I'm jealous. I like the bowtie valve covers.
Me too about the demons. We've had a lot of threads on here with problems
too rich at idle, bogging, and left over shavings from manufacturing process.
I got a re-manuf. engine out of a farm truck with only 10,000K miles on it and when I drove it the quadrajet didn't give me the primary performance I wanted so when I put the engine back together I went with a 600 edelbrock that came with the used performer RPM when I put it back together. It wasn't in the best of shape so I bought and re-built an 1850-2 600cfm holley and I was spot-on! Iv'e had a lot of holley's over the years so I guess my experience with them paid off. Here's a pic of mine on the stand about a week before installation. Good luck with your project looks dam good!
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