drilling out idle bleed?
08-02-2007, 08:03 AM
#1
Senior Member
Thread Starter
Join Date: Apr 2002
Location: Deer Park, N.Y.
Posts: 514
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1983 z-28/SFC/bilsteins/adj.arms
Engine: 355sbc/Demon650dp/hedmanheaders/
Transmission: t-5, alum DS
Axle/Gears: 3.42 torsen posi, baer discs
drilling out idle bleed?
has anyone drilled out the idle bleeds in their 3310 holley as a mod to get it to idle right on a 350 sbc? i've read that this is the only mod to do to get it to idle right. it's to get more air in at idle and still get the idle screws to 1.5 turns out. right now, my idle screws are out .5 turns with max. vacuum...
08-02-2007, 08:35 AM
#2
Senior Member
iTrader: (3)
Join Date: Jul 1999
Location: London ON Canada
Posts: 632
Likes: 0
Received 1 Like
on
1 Post
Car: 87 IROC
Re: drilling out idle bleed?
How is the idle quality right now? does it idle smooth? If its running fine, I would be hesistant to drill the bleeds out. The 1.5 turns that is a recommended starting point, is just a ball park figure that should work for most setups.
08-02-2007, 09:30 AM
#3
Senior Member
Thread Starter
Join Date: Apr 2002
Location: Deer Park, N.Y.
Posts: 514
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1983 z-28/SFC/bilsteins/adj.arms
Engine: 355sbc/Demon650dp/hedmanheaders/
Transmission: t-5, alum DS
Axle/Gears: 3.42 torsen posi, baer discs
Re: drilling out idle bleed?
idles smooth....20" vacuum!!!...alright, i also read: don't mess with the bleeds but put a thin wire in the idle feed restrictions in the primary metering block!....carbs are complicated......
08-02-2007, 10:13 AM
#4
Supreme Member
iTrader: (8)
Join Date: Sep 2004
Location: Charles County, Maryland
Posts: 1,896
Likes: 0
Received 0 Likes
on
0 Posts
Car: 2000 BMW M5
Re: drilling out idle bleed?
20" vacuum, holy crap that must be a small cam. Is the ZZ4 cam w/ 1.6 rockers pulling that much vac?
08-02-2007, 11:01 AM
#5
Senior Member
Thread Starter
Join Date: Apr 2002
Location: Deer Park, N.Y.
Posts: 514
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1983 z-28/SFC/bilsteins/adj.arms
Engine: 355sbc/Demon650dp/hedmanheaders/
Transmission: t-5, alum DS
Axle/Gears: 3.42 torsen posi, baer discs
Re: drilling out idle bleed?
no, it's 1.5 rockers now....want to go bigger. yea....20"'s!
08-02-2007, 11:06 AM
#6
Supreme Member
iTrader: (5)
Join Date: Jan 2002
Location: Orland Park, IL
Posts: 13,619
Likes: 0
Received 3 Likes
on
3 Posts
Car: 1984 Z28
Engine: SLOW carbed ls
Transmission: TH400 with brake, 8" PTC converter
Axle/Gears: moser 9" 4.11
Re: drilling out idle bleed?
if it runs fine I'd leave it, sounds like it is getting enough air and barely needs the amount of fuel needed as the mixture screws add more fuel not air. If anything you "could" put some welding wire or the wire inside a twist tie like from the grocery store for fruit bags, but if it ain't broke don't fix it.
08-02-2007, 11:10 PM
#7
Moderator
iTrader: (14)
Join Date: Mar 2000
Location: Littleton, CO USA
Posts: 43,169
Likes: 0
Received 35 Likes
on
34 Posts
Car: 82 Berlinetta/57 Bel Air
Engine: LS1/LQ4
Transmission: 4L60E/4L80E
Axle/Gears: 12B-3.73/9"-3.89
Chevy High Performance magazine had an article about all that stuff a couple of months ago.
My opinion is if you're going to get into that stuff, you're better off with a main body with screw-in bleeds, and metering blocks with screw-in restrictors.
My opinion is if you're going to get into that stuff, you're better off with a main body with screw-in bleeds, and metering blocks with screw-in restrictors.
Trending Topics
08-03-2007, 07:17 AM
#8
Senior Member
Thread Starter
Join Date: Apr 2002
Location: Deer Park, N.Y.
Posts: 514
Likes: 0
Received 0 Likes
on
0 Posts
Car: 1983 z-28/SFC/bilsteins/adj.arms
Engine: 355sbc/Demon650dp/hedmanheaders/
Transmission: t-5, alum DS
Axle/Gears: 3.42 torsen posi, baer discs
Re: drilling out idle bleed?
Yup...that's the logical answer.....get a carb that fits the application!!!and not try to shoe-horn one in that's not ment for your motor! lesson learned!
Thread
Thread Starter
Forum
Replies
Last Post
dimented24x7
Tech / General Engine
4
09-06-2015 03:51 PM
