I have an unmolested list # 9375 1050cfm 4500 Holley that I know is intended to be used on a 2x4 setup, I'm using it as a 1x4 set up on a 511 cid BBC for right now.
The carb runs way rich. I jetted it down to # 82's square and it is still pig rich.
Can it be jetted down enough to run semi decently ?
Possibly better to change out the air bleeds for the intermediate or high speed circuit instead/also ?
Does anyone know where I can buy a few air bleeds instead of paying 180 $ for the kit ?
I found out how tight the air bleeds are installed and quit trying to remove one before I did any damage. Are they always this tight and do they normally come out w/o causing any damage ?
I dont want to make any modifactions to this carb at this time. Just want to know if its possible to get it to stop blackening the spark plugs.
Holley 9375 1050
Moderator: Team
-
maxracesoftware
- Vendor
- Posts: 3656
- Joined: Sat Feb 14, 2004 4:04 pm
- Location: Abbeville, LA
- Contact:
i guessed you already checked out that the air bleeds are not plugged up, or any other passages ?I have an unmolested list # 9375 1050cfm 4500 Holley that I know is intended to be used on a 2x4 setup, I'm using it as a 1x4 set up on a 511 cid BBC for right now.
The carb runs way rich. I jetted it down to # 82's square and it is still pig rich.
Can it be jetted down enough to run semi decently ?
how much ignition timing are you running at idle RPM ?
where's the Cam installed at CL ?
the 0-9375 usually works great with 90-92 jets here around Sea-Level to 2000 Ft Density Altitude
with the 0-9375, its like have (2) 2-Barrells, you should set the idle RPM by "evenly" adjusting the front and the rear throttle blade's opening.
if you are too much into the front throttle
at near idle RPM because of ->
cam a little too retarded,
not enough ingnition timing or wrong advance curve,
it will pull too much fuel out of Venturi/Boosters or cause dripping,
also checkout too high float levels.
if nothings wrong internally with the 0-9375 it will meter
13.0 to 14.5 A/F normally at 600 RPM/SEC Dyno test with 90-92 jets at 0.0 to 2000 Ft DA
going to 82 jets is going to be way too lean under full-throttle acceleration.
-
DCarr511
Its a 0-9375-2 I beleive it came with 86's square.
All passages were checked and are clear
timing is at 36*btdc locked out
cam is in at 106.25 and a 110 LSA
Float level is good have, to rock the car just a bit to get fuel to spill
Idle was set equally front/rear
We are approx 800' alt. w/ a DA of 1200-2000 being comman
I just put this engine back together. The carb is a year old and has 4 passes on it and it was rich then.
The engine was ran last weekend for about 15 min. on my run stand RPM was around 2000 for the flat tappet cam and it was rich during that time. I ran it today at idle mostly and it was real rich.
all 4 idle fuel mix. screws are at 1 1/8 turns
All passages were checked and are clear
timing is at 36*btdc locked out
cam is in at 106.25 and a 110 LSA
Float level is good have, to rock the car just a bit to get fuel to spill
Idle was set equally front/rear
We are approx 800' alt. w/ a DA of 1200-2000 being comman
I just put this engine back together. The carb is a year old and has 4 passes on it and it was rich then.
The engine was ran last weekend for about 15 min. on my run stand RPM was around 2000 for the flat tappet cam and it was rich during that time. I ran it today at idle mostly and it was real rich.
all 4 idle fuel mix. screws are at 1 1/8 turns
-
DCarr511
-
DCarr511