runninng rich
Thread Starter
Member
iTrader: (1)
Joined: Jul 2004
Posts: 368
Likes: 0
From: sandusky
Car: 1987 iroc z
Engine: 355 dart platinum 215cc heads
Transmission: <<BLOWN UP TH400>>
Axle/Gears: 10 bolt 4.11's
runninng rich
i just got my motor together and running but im having a problem its running rich the spark plugs have carbon build up. they are brand new plugs and wires. the carb idle circuits are 2 1/2 turns out. motors in sig didnt have a problem with last motor stock 882 headed 350. any ideas oh ya i havent drove it yet or any high rpms could it be cause im just leting it idle
Supreme Member
iTrader: (17)
Joined: Nov 2005
Posts: 1,104
Likes: 2
From: Leicester,Massachusetts
Car: 1983 CHEVROLET CAMARO Z28
Engine: Forged 355 with a GT45 turbo
Transmission: TKO 600
Axle/Gears: built 4th gen rear with 3.27s
Re: runninng rich
what is your tiing at? what type of carb are you running? what copression ratio does yourengine have? a lil more detail will help
Junior Member
Joined: Jun 2007
Posts: 58
Likes: 0
Car: 1985 Z28
Engine: 355 topped with Dart heads
Transmission: 700R4
Axle/Gears: Stock axle with 3.73's
Re: runninng rich
How much advance are you running at an idle? Also, what are you using for spark plugs? I believe those heads call for an autolite AR133, a very cold plug.
I have an engine combo very close to yours, same heads and a very similar cam. Mine needs a lot of initial advance to idle decently, I also switched to a carb with 4-corner idle.
I have an engine combo very close to yours, same heads and a very similar cam. Mine needs a lot of initial advance to idle decently, I also switched to a carb with 4-corner idle.
Last edited by battyice; Jul 26, 2007 at 12:07 AM. Reason: typo.
Senior Member
Joined: Apr 2002
Posts: 514
Likes: 0
From: Deer Park, N.Y.
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: runninng rich
dude....2.5 turns out is way too much for the idle screws. on a holley it should be from .5 to 1.5 turns out. did you use a vacuum gauge to dial in the idle? should have the screws set for the highest vacuum at idle.
Senior Member
iTrader: (1)
Joined: Oct 2005
Posts: 809
Likes: 8
From: Greenville WI
Car: 91 Firebird
Engine: Turbo 355
Transmission: T-56
Axle/Gears: 3.73:1 7.625" 10 Bolt
Re: runninng rich
We have very similar combos... and I'm having the same problem you are. I think I personally need to just drive the car a little bit. I havn't driven mine either. Tonight I am changing plugs, fuel filter, draining my old gas, taking off the carb and cleaning it out. I think this should do it. What is your initial timing at? I run about 21 degrees initial, 34 degrees in by 2500 rpm. Also, what P.V. do you run?
Senior Member
Joined: Apr 2002
Posts: 514
Likes: 0
From: Deer Park, N.Y.
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: runninng rich
bump...
Last edited by wdigitog; Aug 14, 2007 at 05:57 PM.
Thread
Thread Starter
Forum
Replies
Last Post
