Idleing problems with a 350 sbc - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Engine
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 12-27-2005, 03:11 AM
Member
 
Last photo:
Join Date: Apr 2005
Location: ohio
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Idleing problems with a 350 sbc

i have a 350 goodwrench crate motor with 10.1's torker2 intake stock 1.94/1.5 valves,.454/.454 lift 272/272 duration hyd cam,stock vac advance distributor carb,stock conveter in 350 turbo,and a 650 double pumper carb with no choke, with a 2 inch spacer plate the one with 4 barrel holes.The mixture screws on the carb are each turned out 2 1/4 turns on each and the idle is at 1100rpm.And also the floats are set at the bottum of the sight hole.

But when i put the car in gear it dies almost as it acts it needs a converter.
but it had a 650 single pumper vac seondary and idle fine in gear but did not have spacer plate on it.

I think it could be possibly be the spacer plate orcould mabe even need jetted higher?

iam not for sure but i just need other opinions thanks i could use help on the bugger.
Thanks Eric.

    Advertisement

Last edited by Eric327; 12-27-2005 at 03:41 AM.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 12-27-2005, 05:51 AM
tnsmith10's Avatar
when will it rain???
 
Last photo:
Join Date: Jul 2003
Location: where its very dry and dusty
Age: 43
Posts: 1,297
Wiki Edits: 0

Thanks: 0
Thanked 2 Times in 2 Posts
sounds like it might be either low energy from the distributor, or a big vacuum leak. any other info u can add?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 12-27-2005, 07:28 AM
Registered User
 
Last photo:
Join Date: Nov 2004
Location: Cali
Posts: 994
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
How about losing the spacer plate and putting the old carb back on? Sounds like a big vacuum leak.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 12-27-2005, 08:29 AM
spinn's Avatar
Bubbles is the girl next door
 

Last journal entry: This makes a huge difference
Last photo:
Join Date: Oct 2004
Location: Midnight
Posts: 2,498
Wiki Edits: 0

Thanks: 13
Thanked 82 Times in 80 Posts
torquer 2 ? why didnt you go tunnel ram ?...lol
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 12-27-2005, 09:59 AM
larryblack's Avatar
Certified Lead Foot
 
Last photo:
Join Date: Jan 2003
Location: Houston, TX again
Age: 63
Posts: 519
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Idling at 1100 rpm, you may not be using the idle circuit and probably are in the transistion circuit.

I would loose the spacer first, get the carb to work then add the spacer. No sense fighting two items at once. Make sure you have NO vacuum leaks.

How much vacuum do you hold at idle and what size power valve is in the carb? The number on the power valve needs to be 1.5 to 2.5 lower than the vacuum level at idle. IE 8.5 vacuum reading you need 6.5 or 5.5 power valve.

Secondly, if you have the transistion circuit uncovered to make it idle, you need to either open the secondary slightly, or drill a small hole in each primary butterfly to allow more air at a lesser opening.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 12-27-2005, 11:23 AM
Registered User
 
Last photo:
Join Date: Nov 2004
Location: Cali
Posts: 994
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
With a Crane 105072 cam you should have well over 15" vac at idle, and the idle should be very steady at 750 rpm.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 12-27-2005, 12:15 PM
curtis73's Avatar
Hates: Liver. Loves: Diesel
 
Last wiki edit: How to find cheap parts
Last journal entry: 1999-2001: Getting it on the road
Last photo:
Join Date: Dec 2005
Location: Carlisle, PA
Age: 40
Posts: 5,148
Wiki Edits: 16

Thanks: 0
Thanked 4 Times in 4 Posts
I would check for the vacuum leak first, but you also said stock distributor. Don't use stock timing, you'll need a lot more initial to get that to idle well. I wouldn't be happy without a complete re-curve of that ignition. More initial, proper total, then an adjustable vacuum advance can.

I also agree that at 1100 rpms you're way into the primaries and off the idle circuit. You should be able to get a nice almost stock idle speed with that cam. More initial will let you drop the idle screw back down getting you back into the idle circuit.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 12-29-2005, 12:21 AM
Member
 
Last photo:
Join Date: Apr 2005
Location: ohio
Posts: 50
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
thanks

thanks for the replys is was the spacer and the power valve wasnt stiff enought ty for the replys.
Reply With Quote Quick reply to this message

Recent Engine posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
Why not a 350 sbc? bowtieorbust Engine 29 09-05-2008 09:43 AM
SBC 350 forced induction buildup sickgrin Engine 8 09-13-2004 07:07 PM
Why is my sbc chevy 350 getting so hot? batman09 Engine 17 08-22-2004 07:37 PM
Switching from olds 350 to chevy 383... and now I've got problems matching up trannys elukas Transmission - Rearend 6 08-26-2003 12:03 PM
0.060 over 350 sbc or 0.040 over 400 splayed cap sbc tony350ss Engine 4 05-17-2003 09:02 PM


All times are GMT -6. The time now is 02:23 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.