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Author Topic:   help on carburetors
bryan kaster
Dirt Roller

Total posts: 13
posted January 15, 2003 11:22 PM
I am looking for any advise i can get on a rochester Quadrajet. Our rules we can only run off the primaries and the secondaries are wired shut. What can i do to make it eigther get more flow or just perform better? any advice would be greatly appreciated.

Darcy
Dirt Full Roller

Total posts: 54
posted January 16, 2003 08:31 PM
hi bryan for all your carby problems you should talk to the pro's give this guy a ring at kinetic performance (607)277-6462 speak to dayton he will be more than happy to help you and stear you in the rite direction.
regards darcy

bryan kaster
Dirt Roller

Total posts: 13
posted January 16, 2003 11:02 PM
quote:
Originally posted by Darcy:
hi bryan for all your carby problems you should talk to the pro's give this guy a ring at kinetic performance (607)277-6462 speak to dayton he will be more than happy to help you and stear you in the rite direction.
regards darcy

Thanks Darcy Ill give him a call I appreciate it.
Bryan

KPLugnut
Dirt Freak

Total posts: 408
posted January 17, 2003 07:13 PM
Bryan,
Sorry I missed your call. One thing after another today, it seemed I was never near a phone longer than 2 seconds.
Feel free to try calling again over the weekend (same #) and I'll be glad to assist.

Or email me on the side and we can discuss details.

Dayton Umholtz, owner
Kinetic Performance
email: kineticperformance@thedirtforum.com http://www.kineticperformance.net

fast21
Dirt Newbie

Total posts: 1
posted January 18, 2003 02:44 AM
uh, that kinetic carburation place do bench flows? im limited to a holley 4412 need someone to help me chea...make more power.
if they do bench flows whats their website url?

KPLugnut
Dirt Freak

Total posts: 408
posted January 18, 2003 07:54 AM
Here is our website: http://www.kineticperformance.net

We build 2bbls that flow and make equal HP to the top 3 in the country but for a LOT less money than most.

If you'd like to discuss our flow numbers, etc, or any other questions, feel free to email me directly at:
kineticperformance@thedirtforum.com

Or feel free to call me at the shop (and my home) number after 5pm weekdays or on weekends: 607-277-6462. You can also call that number during the day and leave a message on the machine and we will get back to you immediately when I get there.

The reason I went thru all that trouble to tell ya that is I still work a day job and it's possible to contact me there but I try not to do too much Kinetic Performance work while at the day job.

Hope to help you out,

Dayton Umholtz, owner...aka "KPLugnut"
Kinetic Performance

bncars10sen
Dirt Roller

Total posts: 13
posted January 22, 2003 12:16 PM
Your better off running a 2 barrel Rochester, CFM 500. You can get them off old busses and Some Big Blocks. The 4 barrel Quad, with the seconds wired shut, will flow less than the 2 barrel 500.

KPLugnut
Dirt Freak

Total posts: 408
posted January 22, 2003 12:31 PM
FWIW, no 2bbl Rochester in stock form ever flowed 500cfm. They were rated stock from Rochester Engineering at 450cfm in their largest form (the 1 3/8" venturi). The latest ads out in the marketplace stating "stock carb that flows 500cfm" are an overstatement or slightly inflated for sales purposes. Many of those carbs, btw, are not factory original 1 3/8" venturi carbs, they have been machinied to that diameter and in some classes are not legal.

The original poster stated his rules required that he ran a quadrajet with non-functional secondary air flaps, so that ruled out the use of any other carb, whether 2bbl or 4bbl.
One additional note, a well prepared quadrajet will flow very nearly 350cfm off it's primaries (when rules like this are in place). That winds up being quite similar to the very commonly used 7448 Holley 2bbl.
But, of course, MUCH more has to be done to the quadrajet (in terms of both time, parts, and alterations) to get that much back out of it....and in the end, it costs as much or more to the racer, which defeats the whole intent of the rule in the first place.

Hope that helps,

Dayton Umholtz, owner
Kinetic Performance

flywheel
Dirt Roller

Total posts: 9
posted January 22, 2003 03:56 PM
His rules don't say it can't be modified, are you allowed to remove the choke housing? That and do some polishing of the ports as much as possible, suggest you try a junk carb first to preven ruinning a good carb.

Deek
Dirt Full Roller

Total posts: 45
posted January 22, 2003 04:36 PM
Actually, the rules for this class do refer to keeping the engine and related components stock. Tech at this track will allow competitors to remove the butterfly and related rod from the choke housing, but not the choke housing itself. Cars in this class have been DQ'd in the past for polishing on the carb throttle bores.

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