new 350 clatters when cold - 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 11-09-2010, 09:47 PM
jls4speed's Avatar
Registered User
 
Join Date: Sep 2010
Location: ct
Posts: 63
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
new 350 clatters when cold

simply put. i can start the motor and rev it and is super smooth. but, when i start it on a cold day, or lets say until it reaches operating pressure i hear a knocking. especially when its shifting from first to second. it seems to me like its the lifters. as i throttle through first gear and start hitting 2500 rpm i can hear a sound like if you were to repeatadley tap a marble against an anvil as fast as you could. as i reach the top of first ger its the worst. hits second and i dont hear it. idk. any ideas? once warm, it goes away. new lifters and cam by the way. month old.

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 11-09-2010, 09:52 PM
68NovaSS's Avatar
Hotrodders.com Moderator
 
Last wiki edit: Working with chromed bolts
Last journal entry: New to me T-Bucket
Last photo:
Join Date: Sep 2002
Location: Nine Mile Falls/Suncrest, WA
Posts: 5,248
Wiki Edits: 9

Thanks: 105
Thanked 133 Times in 124 Posts
Could it be detonation?
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 11-09-2010, 09:59 PM
jls4speed's Avatar
Registered User
 
Join Date: Sep 2010
Location: ct
Posts: 63
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
no way. ive had detonation and previous motors and i could NEVER mistake that sound.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 11-09-2010, 11:17 PM
DoubleVision's Avatar
Not Considered a Senior Member
 
Last photo:
Join Date: Oct 2002
Location: Heart Of Dixie
Age: 40
Posts: 10,658
Wiki Edits: 0

Thanks: 15
Thanked 59 Times in 56 Posts
Sounds like piston slap to me. Before I rebuilt my 4.3 V6 in the winter months cold start you could hear a couple of pistons slapping under load. Sitting at idle you didn`t hear it. Once it got up to temp the slap went away. Hyper pistons which don`t expand much and call for very tight cylinder tolerances are prone to piston slap even if the clearance is only slightly too big.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 11-09-2010, 11:20 PM
Semper Gumby
 
Last photo:
Join Date: Feb 2007
Location: Vancouver, BC
Posts: 335
Wiki Edits: 2

Thanks: 153
Thanked 157 Times in 130 Posts
350 clatter

If it ONLY rattles when the engine is cold, it may well be that the oil isn't getting "upstairs" fast enough. What oil are you using? I used to have a 350 -powered pick-up that seemed to prefer to have 20-50 oil rather than 10-30 or 10-40, but would give me lifter rattle until it began to warm up. Didn't do that on 10-30. (I eventually settled on a half&half mix of 10-30 and 20-50. Engine was happy hot or cold.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 11-09-2010, 11:25 PM
jls4speed's Avatar
Registered User
 
Join Date: Sep 2010
Location: ct
Posts: 63
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
im runnin 10w 40. it doesnt burn oil or anything. if i run 20/50 will i kill my motor?
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 11-09-2010, 11:53 PM
Semper Gumby
 
Last photo:
Join Date: Feb 2007
Location: Vancouver, BC
Posts: 335
Wiki Edits: 2

Thanks: 153
Thanked 157 Times in 130 Posts
Clatter

Not likely to kill it if you put 20-50 in it - but it will take even longer for the oil to start going through the lifters and you will spend even more time listening to the rattle.

Sometimes something as simple the oil filter type has a bearing on this too.

Since you say this is a "new lifters & cam" situation, there could be issues with clearances, too. Too loose or too tight in some areas can cause either not enough oil to get through, or too much to by-pass and cause the lifters to rattle until things warm up a bit. Is it maybe ONE lifter or all of them?

A few things to ponder.

In my case the reason my engine liked the 20-W50 was because it was getting old & tired and yet I needed it to pull some fairly heavy trailers and it would burn oil if I used too light a grade. Yet the 20-50 was too heavy on first start in the morning and caused the lifter clatter. The 50/50 mix of 10-W30 with 20W50 was a stop-gap solution that worked! (for me, for that engine, under those conditions, etc)
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
Port or Full time vacuum cool rockin daddy Engine 129 10-05-2010 03:00 PM
Centrifugal advance DENCOUCH Engine 7 05-07-2010 06:39 PM
350 chevy wont cold start J. E. Allison Engine 8 02-18-2010 06:59 PM
Oh crap!! 350 or 327?? Biscuit6447 Engine 21 08-28-2009 11:59 AM
Cold run/fuel enrichment for '94 Chev 350? FlyB58 Engine 4 01-04-2003 07:54 AM


All times are GMT -6. The time now is 02:21 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.