Carburetor Identification/Problems
Jeff Day
that's what it looked like.) If anyone can help me id my carb it'd be very
appreciated. I've been told by some it's a 750cfm double pumper and others
that it's a dual feed and not a double pumper, so I wanna know the truth.
If there's another number I need, I'd like to know the location. I've heard
it's supposed to be on the airhorn, but not knowing what the airhorn is
kinda hurts my ability to find things.
Anyway, my car has been having the following probs which I've been told
is related due to the carb. First, it seems to have way too much "pep",
like it always wants to get up and go, sort of a jerking (some people I've
talked to referred to is as "loping" or something similar in pronounciation
to that.) Also, it's running rich (my dad parks his van about 6 feet behind
it, and when you start it up it'll literally collect excess unburnt gas on
his bumper.) Finally, it sometimes just dies/stalls, you can tell it'll die
soon due to a change in the tone/sound coming from the engine. The dying
isn't often, and seems to be the result of pumping the gas too much.
There's also the following probs with the carb; 1) It's a 4 barrel and
only 2 of the barrel and hooked up right (wrong adaptor plate or something?)
2) It's a manual choke, and the choke isn't hooked up, basically it's just
sitting open all the time. 3) The "kickdown" (unsure what that is) isn't
hooked up.
Again, if anyone can help me in anyway it'll be very appreciated. I'm
pretty much a car newbie, and although I pick up on things fairly quickly
most of the people I talk to concerning my car seem to know about as much as
I do, making things fairly difficult. I've already found a url to help
tune/calibrate my carb (http://home.inreach.com/geewhiz/carb.htm,) but not
knowing what kinda carb it is exactly hurts my chances of tuning it
correctly. Anything I said above that isn't factually right I don't take
credit for, since most of everything I've said in my 2nd and 3rd paragraphs
are just 3rd person speculation, so I don't know how accurate it is.
Thanks,
Jeff Day
84 Black Z-28, 350
Musashi
> My carb is a Holley and I found a number on it saying 12R-10554B (least
>that's what it looked like.) If anyone can help me id my carb it'd be very
>appreciated. I've been told by some it's a 750cfm double pumper and others
>that it's a dual feed and not a double pumper, so I wanna know the truth.
>If there's another number I need, I'd like to know the location. I've heard
>it's supposed to be on the airhorn, but not knowing what the airhorn is
>kinda hurts my ability to find things.
The air horn is the thing over the primaries <the two bores at the
front of the carb> that the choke is attached to. A quick way to tell
if it's a DP is to look under the rear fuel bowl. Check to see if
there is an accelerator pump under it, if there is it's a DP. The
accelerator pump at the rear is going to look just like the one under
the front bowl.
> Anyway, my car has been having the following probs which I've been told
>is related due to the carb. First, it seems to have way too much "pep",
>like it always wants to get up and go, sort of a jerking (some people I've
>talked to referred to is as "loping" or something similar in pronounciation
>to that.)
And this is a bad thing?
> Also, it's running rich (my dad parks his van about 6 feet behind
>it, and when you start it up it'll literally collect excess unburnt gas on
>his bumper.)
So drop the jetting down. Also, do you run the car long enough to
reach its operating temp, and does it get a chance to rev up
occasionally? If not, the car is more prone to foul and "carbon load"
the chambers and plugs. That's why some people like to blow out the
car every now and then. It might not help, but it's the easiest and
cheapest thing to try!
> Finally, it sometimes just dies/stalls, you can tell it'll die
>soon due to a change in the tone/sound coming from the engine. The dying
>isn't often, and seems to be the result of pumping the gas too much.
> There's also the following probs with the carb; 1) It's a 4 barrel and
>only 2 of the barrel and hooked up right (wrong adaptor plate or something?)
>2) It's a manual choke, and the choke isn't hooked up, basically it's just
>sitting open all the time. 3) The "kickdown" (unsure what that is) isn't
>hooked up.
Uhh, you really need to get a good carb book, and I'd recommend
the SA Design workbench series Holley Rebuilding and Modifying. It
will help you out a great deal and will teach you what you need to
know about carb's parts and function.
---
Hey let's party, let's get down let's turn the radio
on this is the meltdown.
Get out the camera take a picture, the drag queens
and the freaks are all out on the town;
and Cowboy Jane's in bed,
nursing a swollen head
Sunshine Sally and Peter Ustinov don't like the scene anyhow
I dropped acid on a saturday night
just to see what the fuss was about.
now there goes the neighborhood!
Jeff Day
> Uhh, you really need to get a good carb book, and I'd recommend
>the SA Design workbench series Holley Rebuilding and Modifying. It
>will help you out a great deal and will teach you what you need to
>know about carb's parts and function.
Thanks for your input, I can literally use all the help I can get so
it's highly appreciated. Btw, I looked for the book you referred to on
amazon.com and came up with 2 that seem to close to what you said. Holley
Rebuilding and Modifying (workbench book) by Jeff Williams + Super Tuning &
Modifying Holley Carburetors (S-A Design) by Dave Emanuel. I'm guessing you
were implying the second one, but clarification would be appreciated before
I order the wrong book. :)
Jeff Day
> My carb is a Holley and I found a number on it saying 12R-10554B (least
>that's what it looked like.) If anyone can help me id my carb it'd be very
>appreciated. I've been told by some it's a 750cfm double pumper and others
>that it's a dual feed and not a double pumper, so I wanna know the truth.
>If there's another number I need, I'd like to know the location. I've
heard
>it's supposed to be on the airhorn, but not knowing what the airhorn is
>kinda hurts my ability to find things.
I've looked more into finding #'s on my carb, and I've located the
following two in addition to my first find "R84010-2" and "188-4." From the
Holley carb list on their web site, it seems that that carb is only a
600cfm? Am I correct, cause when I bought it (the car) the previous owner
informed me that it was a 750cfm d.p, so I'm not sure rather he was
misinformed or misled me intentionally.
Thanks,
Musashi
I meant the first one, by Williams. Emmanual's book is great, and
I personally love it, but it's a bit more advanced and assumes that
you have some familiarity with Holley's already. The Workbench Series
is one that you can literally take to a bench and use as an assembly
manual <for most Holley carbs>. It starts with the basics and spends
more time on practical, real world tips, like which cleaners to use
and what a clutch head screwdriver is <and why you want one for the
metering plate>, rather than the more theoretical side like Emanual
does <covering special racing mods and blown applications>. William's
book is also less daunting to the new builder and has tons of pictures
with useful captions.
Bigjfig
I believe the 4010 series is a universal style replacement Holley carb for all
small block chevy applications. I will check and see if I have any
specification information at work. Someone here might have the information
handy though and beat me to it!!
Good luck with the Z.
Joe with 1980 Turbo Trans Am (26k original)
ASE Certified Parts Specialist
http://www.tatribe.com/Joes80.html
Musashi
>following two in addition to my first find "R84010-2" and "188-4."
>
>I believe the 4010 series is a universal style replacement Holley carb for all
>small block chevy applications. I will check and see if I have any
>specification information at work. Someone here might have the information
>handy though and beat me to it!!
Yeah, the 4010/4011 are generic, low performance versions Holley
made. It's looks similar to a Ford Autolite carb and isn't like a
regular modular Holley. I don't know too much about them off hand
myself. They're sorta like a red headed step child in the Holley
family.
Cliff
Cliff
69 Camaro project (454, M20, 3.73 posi, Vintage Air.
56 Bel Air Sport Coupe.
69 53,000 mile Camaro Survivor - 350/auto, a/c houndstooth, etc. SOLD
95 Z-28 6spd convert.
96 jimmy SUV
On 9 Apr 1999 01:01:55 GMT, big...@aol.com (Bigjfig) wrote:
>following two in addition to my first find "R84010-2" and "188-4."
>
>I believe the 4010 series is a universal style replacement Holley carb for all
>small block chevy applications. I will check and see if I have any
>specification information at work. Someone here might have the information
>handy though and beat me to it!!
>