Above 4500 RPMs missing and stalling - 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 05-01-2010, 01:39 AM
Registered User
 
Join Date: Mar 2010
Location: Finksburg, Md
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Above 4500 RPMs missing and stalling

What are possible causes of a mild 350ci missing and stalling above 4,500 RPMs? I have heard it could be one of the following:

1. Floating valves due to weak springs.
2. Carburator is to small. Bigger jets may be needed.
3. Distributor/timing is not set correctly.

Is this correct? Any other possible reasons for this happening?

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 05-01-2010, 01:53 AM
ericnova72's Avatar
More for Less Racer
 
Join Date: Jan 2007
Location: S.W. Lower Michigan
Age: 47
Posts: 8,998
Wiki Edits: 0

Thanks: 20
Thanked 382 Times in 351 Posts
Fuel pump or fuel filter may not be able to keep up with demand. Not likely a jet problem but no fuel even at the jet for this reason. Fuel line size physically too small. Plugged vent in fuel tank.- all possible

Carb too small?? Not really an issue, too small will limit power but it will still run fine as long as there is enough fuel in the float bowl, what do you think a 2 bbl carb does, causes an issue like this - NOPE

Timing and valve adjustment or valve float - Yes, quite possible.

Ignition breaking down, worn out guts or weak coil/bad plug wires - yes also possible.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 05-01-2010, 05:21 AM
sqzbox's Avatar
My pipes are my music
 
Last photo:
Join Date: Sep 2009
Location: indiana
Age: 64
Posts: 2,938
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Single point type distributors used to have a problem like that also. It was called point bounce. It was caused by weak or insufficient spring tension on the point set. The contact on the points would bounce from lobe to lobe on the dist. cam without fully closing and making contact.

Only cure was to double spring the points, get a hp set, or buy a dual point distributor.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 05-01-2010, 01:50 PM
Registered User
 
Join Date: Mar 2010
Location: Finksburg, Md
Posts: 47
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Gents,

Appreciate the reply!
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



All times are GMT -6. The time now is 02:42 AM.


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.