Help with a 850 holley carb - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

Mr. Nasty · 04-20-2013, 09:51 AM

Just installed a wide band on the 68 at idie running 13.9 and cruse 12.5 but WOT 15.2 its, a 850 holley vacuum secondary. Fuel level is correct. Running 78 & 82 jets with rear extension. Light spring in secondary is all in at WOT.

Just thinking of going up one jet size and playing with the idle mixing screw on main would that help? Are is that to easy??

A little info on set up its a zz502. I am at 18 D base on timing all in at 3600rpm with #4 plugs AC DELCO.

willhe64 · 04-20-2013, 11:51 AM

Your gonna want to be up around 96-98 on your jets. Thats your issue. Is the power valve blocked on that carb? What is your vacuum at idle?

SC2150 · 04-20-2013, 12:39 PM

Also, idle air mixture is just that, idle only. From there the air bleeds for the main circuits come into play.

Mr. Nasty · 04-20-2013, 12:40 PM

Quote:

Originally Posted by dynosteve

hi sir pm me any questions you have as im only too willing to help

Thanks I will when I check on other the thing on the curb

Mr. Nasty · 04-20-2013, 01:11 PM

Quote:

Originally Posted by willhe64

Your gonna want to be up around 96-98 on your jets. Thats your issue. Is the power valve blocked on that carb? What is your vacuum at idle?

Will check vacuum tomorrow. That a big jump on jets but will go up on them and check power valve. Trying to get a starting point on tune.

Mr. Nasty · 04-20-2013, 01:25 PM

Quote:

Originally Posted by SC2150

Also, idle air mixture is just that, idle only. From there the air bleeds for the main circuits come into play.

Yeah my idle is good. Maybe the air bleeds has some thing in it are just needs to be resized ?

willhe64 · 04-21-2013, 10:11 AM

We use welding tip cleaners to check or hone the air bleeds out a bit.

04-20-2013, 09:51 AM	#1
Mr. Nasty Emerald Coast Camaros Drives: 2010 RS/SS Rally Yellow & 68 SS Join Date: Dec 2012 Location: Woodville,FL. Posts: 1,814	Help with a 850 holley carb Just installed a wide band on the 68 at idie running 13.9 and cruse 12.5 but WOT 15.2 its, a 850 holley vacuum secondary. Fuel level is correct. Running 78 & 82 jets with rear extension. Light spring in secondary is all in at WOT. Just thinking of going up one jet size and playing with the idle mixing screw on main would that help? Are is that to easy?? A little info on set up its a zz502. I am at 18 D base on timing all in at 3600rpm with #4 plugs AC DELCO. Attached Images __________________ Best @ 586/525 =10.41 @ 133 AS OF 12/13/14>633 RWHP =10.22@135 AS OF 1/31/15 @ 633 RWHP=10.16@135 AS OF 1/29/16 @ 633 RWHP=10.10@136 TOPED 700 PASSES AFTER F.I. AND STILL ON THE ORIGIANAL STOCK AXLE & DIFF

04-20-2013, 11:51 AM	#2
willhe64 Drives: 2012 45th Vert, 2011 4x4, 9sec Vega Join Date: Mar 2012 Location: Canada Posts: 2,188	Your gonna want to be up around 96-98 on your jets. Thats your issue. Is the power valve blocked on that carb? What is your vacuum at idle? __________________ I feel it only fair to warn you, I have a black belt in CAPS LOCK.

04-21-2013, 10:11 AM	#7
willhe64 Drives: 2012 45th Vert, 2011 4x4, 9sec Vega Join Date: Mar 2012 Location: Canada Posts: 2,188	We use welding tip cleaners to check or hone the air bleeds out a bit. __________________ I feel it only fair to warn you, I have a black belt in CAPS LOCK.

04-20-2013, 12:39 PM	#3
SC2150 Account Suspended Drives: 2012 Camaro RS, RX supercharged Join Date: Dec 2009 Location: Bradenton, FL Posts: 6,063	Also, idle air mixture is just that, idle only. From there the air bleeds for the main circuits come into play.