Main Menu
|
Nevada Classics
|
Advertise at CC
|
S |
M |
T |
W |
T |
F |
S |
|
|
|
|
|
1 |
2 |
3 |
4 |
5 |
6 |
7 |
8 |
9 |
10 |
11 |
12 |
13 |
14 |
15 |
16 |
17 |
18 |
19 |
20 |
21 |
22 |
23 |
24 |
25 |
26 |
27 |
28 |
29 |
30 |
|
CC Advertisers
|
|
07-05-2010, 03:01 PM
|
CC Member
|
|
|
Join Date: May 2009
Cobra Make, Engine:
Posts: 135
|
|
Not Ranked
lean idle it 15-18 on the a/f mixture.
I tried a few more things since and I am sending the carb to AED in the mormning. Details are in another post about idle feed restrictors that seemed to "merge" with this subject. . . .
|
07-05-2010, 03:30 PM
|
|
CC Member
|
|
|
Join Date: Aug 2007
Location: NE Oklahoma,
OK
Cobra Make, Engine: Fords
Posts: 544
|
|
Not Ranked
like you, I have tried in the past to make a carb designed for one application work in a different envirenment. I fussed & fiddled & swore. But in the end, like you, I just had to admit that race carbs work great when accelerating or full bore, but they hate to cruise at a slight throttle opening.
Z.
__________________
'65 K code Mustang
'66 Galaxie 500
|
07-17-2010, 02:20 PM
|
CC Member
|
|
|
Join Date: May 2009
Cobra Make, Engine:
Posts: 135
|
|
Not Ranked
Got it!
Just posted this on Club Cobra:
Okay, so AED had a 3 week back log. I decided to fix it myself, one last try. I changed the idle feed restrictors, 3 different times with different sizes, no good. Just leaned out the idle and did nothing for the transition. I also played with the idle air bleeds again, throttle plate positions, etc. Nothing worked, each step made it worse.
I did have a ring out session (to vent frustration) and learned it runs perfect! at WOT. It truly is a drag race carb. So I pulled it out and cleaned it all up, put in new gaskets and put it all back to bone stock as it came from Holley. Now it is on eBay.
I bought a Street HP 4150 - 850 CFM this time, since it has bigger body (smaller plates).
OUT OF THE BOX - PERFECT!!!
I changed the power valve to 3.5 (idle vacuum is 7) and adjusted the accel pumps, floats, idle mixtures and idle speed. That's it! Done! Cruises perfectly, idles perfectly, no rich spots, no lean spots, WOT right on. I don't even feel any less response or performance from the engine.
The Holley part number is 82851.
Now, I'm going to drive it for a couple weeks to confirm, then the O2 sensor can come off and the TP go on. (maybe the reverse of that) Hopefully the TP won't cause any issues.
Last edited by pusherfans; 07-19-2010 at 08:30 AM..
|
08-10-2010, 04:50 AM
|
CC Member
|
|
|
Join Date: May 2009
Cobra Make, Engine:
Posts: 135
|
|
Not Ranked
Well, I am done. I confirmed it. It still drives awesome. Perfect street manners. The street carb was the way to go for me. TP back on, verified the O2 sensor readings and no changes. O2 sensor off and we're done.
|
02-10-2011, 08:26 PM
|
|
CC Member
|
|
|
Join Date: Oct 1999
Location: Prosper,
TX
Cobra Make, Engine: CAV GT40 #169, Ford 408 Stroker & ZF Transaxle
Posts: 2,408
|
|
Not Ranked
Came across this on YouTube that pretty much supports the lower power valves with big over lap cams.
http://www.youtube.com/watch?v=Va2cd...eature=related
__________________
Gary
CAV GT40
|
02-11-2011, 03:08 AM
|
|
CC Member
|
|
|
Join Date: Jul 2009
Location: Westerly,
RI
Cobra Make, Engine: Fordstroker 408w custom solid roller-Craft ported Brodix 17*heads-CFM ported Vic Jr. intake-1 3/4 primaries- 575hp-TKO-600RR Liberty upgrade- -Moser 8.8 trutrac-McLeod Street Extreme--QA-1-Wilwood brakes, Classic Chambered 3" Cobrapacks, Avon's
Posts: 645
|
|
Not Ranked
Pusherfans,
When you were having your problems did you look at how much transfer slot was exposed like a earlier poster suggested?
I believe that carb came with primary throttle plates drilled with 1/16dia. or so holes, is this correct?
If so Im wondering if the throttle plates holes were too big or not needed in your case because of the bigger upper bores and you were getting too much air causing you to bring the idle down and then causing you to have almost no Transfer showing. This is a classic case as you described.
By filling in the holes temporarily, thus causing a lower idle, you would have had to open up the blades some, exposing more transfer slot, which would have covered the transition from idle to main circuit..
I'm sorry I just found this thread. But I was curious.
Lou
__________________
Lou
|
02-11-2011, 05:24 AM
|
CC Member
|
|
|
Join Date: May 2009
Cobra Make, Engine:
Posts: 135
|
|
Not Ranked
Quote:
Originally Posted by RET_COP
Pusherfans,
When you were having your problems did you look at how much transfer slot was exposed like a earlier poster suggested?
I believe that carb came with primary throttle plates drilled with 1/16dia. or so holes, is this correct?
If so Im wondering if the throttle plates holes were too big or not needed in your case because of the bigger upper bores and you were getting too much air causing you to bring the idle down and then causing you to have almost no Transfer showing. This is a classic case as you described.
By filling in the holes temporarily, thus causing a lower idle, you would have had to open up the blades some, exposing more transfer slot, which would have covered the transition from idle to main circuit..
I'm sorry I just found this thread. But I was curious.
Lou
|
Thanks. I changed carbs with a Street carb (Holley HP4150 Street, 850 cfm) and all of the problems went away. I just put in the correct power valves for my vacuum idle and adjusted the floats and idle mixture and rpm and it was perfect! Thanks.
Last edited by pusherfans; 02-11-2011 at 05:27 AM..
|
Posting Rules
|
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts
HTML code is Off
|
|
|
All times are GMT -7. The time now is 04:21 AM.
Links monetized by VigLink
|