How does this happen? - 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 09-01-2008, 06:22 PM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 678
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
How does this happen?

I was coming home late last night and and did some spirited driving. After I got out of it I noticed my volt gauge was only reading 11 so I figured I threw my belt and wasnt that far from home so I kept going. When I pulled onto my street I noticed my volts were at 13 now and I was confused. When I went out to look at it this morning my belt wasn't thrown but had turned on its side and in some places upside down. My belt melted to my alternator as well. How did this happen?
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 09-01-2008, 06:42 PM
carsavvycook's Avatar
My 2 cents worth
 
Last photo:
Join Date: Sep 2007
Location: Lakeside, CA
Age: 57
Posts: 2,855
Wiki Edits: 3

Thanks: 2
Thanked 2 Times in 2 Posts
Something is heating up from a bearing seizing up. Most likely the alternator.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 09-01-2008, 06:59 PM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 678
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
the alternator is only a month old and its a summit 140 amp. It did through a belt with this alt. before but it only does it if i wind the motor out which I don't do very often. Could I be over spinning the alt. and that could be what is causing the heat?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 09-01-2008, 07:02 PM
Member
 
Last wiki edit: Ford axle ratio codes
Last journal entry: Rear Suspension
Last photo:
Join Date: Aug 2005
Location: Prattsville
Posts: 6,268
Wiki Edits: 31

Thanks: 2
Thanked 41 Times in 40 Posts
is the belt tight enough? I mean, you should have just a little play in the belt.. but not strung like a guitar string
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 09-01-2008, 07:32 PM
carsavvycook's Avatar
My 2 cents worth
 
Last photo:
Join Date: Sep 2007
Location: Lakeside, CA
Age: 57
Posts: 2,855
Wiki Edits: 3

Thanks: 2
Thanked 2 Times in 2 Posts
Quote:
Originally Posted by 1969NovaSS
the alternator is only a month old and its a summit 140 amp. It did through a belt with this alt. before but it only does it if i wind the motor out which I don't do very often. Could I be over spinning the alt. and that could be what is causing the heat?
Myself: I would question the belt alignment, pulley alignment..
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 09-01-2008, 07:35 PM
CustomConspiracy's Avatar
Registered User
 
Join Date: Dec 2007
Location: Winston-Salem NC
Age: 60
Posts: 167
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Belt

This is just a guess but if your engine is really built......then that means it really revs FAST, and with all that compression (just guessing) then when you let off it also UNREVS real fast.
It may be that when you come out of it, the alternator has gained so much RPM momentum, that it can't slow down fast enough, and throws just a little slack in the loop.......enough for a twist to form.
As for the voltage drop......my guess is on the rev side of it.....the motor is reving so fast that it spins the belt......causing the voltage drop and also putting a LOT of heat into the belt.....which would also EXPAND the belt and maybe make for just a little slack even if it seems properly adjusted when it's shut off.
BUT it's probably just a bad bearing.
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 09-01-2008, 07:38 PM
4 Jaw Chuck's Avatar
Hotrodders.com Moderator
 
Last photo:
Join Date: Mar 2002
Location: Manitoba, Canada
Age: 46
Posts: 4,815
Wiki Edits: 0

Thanks: 0
Thanked 60 Times in 48 Posts
You flipped the belt, usually happens with non-deep pulleys when you turn some serious rpms.

You will find you must keep an eye on your belt tension more often and tighten a little more than usual compared to a low rpm daily driver, its the nature of the beast.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 09-01-2008, 07:42 PM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 678
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
It looks like its lined up fine but it may be deceiving me. I was thinking of installing a z/28 deep groove pulley. Its not very expensive and NPD is just down the street from me.
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 09-01-2008, 07:49 PM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 678
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Well the frist time it through the belt was at 7k in first gear and this time it only saw 6k or so. Its no high comp motor. Its been my daily driver for almost 4 years now.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 09-01-2008, 07:56 PM
carsavvycook's Avatar
My 2 cents worth
 
Last photo:
Join Date: Sep 2007
Location: Lakeside, CA
Age: 57
Posts: 2,855
Wiki Edits: 3

Thanks: 2
Thanked 2 Times in 2 Posts
Another thought, may be way off base, but do you have a body ground hooked to the "negative" battery post? This can cause a voltage "over load", (not hooked up) in the charging system.

Last edited by carsavvycook; 09-01-2008 at 08:03 PM.
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 09-01-2008, 07:59 PM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 678
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I have the main cable attached to the head and the smaller cable attached to the fender. I never had a overcharging problem more of a under charging problem with my stereo and fan on .
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 09-01-2008, 08:05 PM
Registered User
 
Last photo:
Join Date: Jun 2008
Location: USA
Posts: 1,172
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
I'd say your heavy electrical load is causing the belt to slip on the alternator pulley.
A lot of high performance cars had larger alternator pulleys to slow the rpm... of course, this hurts low rpm charging.
You would be way ahead if you could convert to a flat belt. Kits are available.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 09-01-2008, 08:17 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: Pittsburgh, PA
Age: 40
Posts: 5,128
Wiki Edits: 16

Thanks: 0
Thanked 1 Time in 1 Post
I have the answer. What do I get if I'm right?

I'll bet $5 that you have a pretty pulley; polished aluminum or chrome? They consistently don't grip the belt. You'll notice inconsistent voltage depending on the belt's temp, but the one thing you will always notice is a screaming hot pulley and sometimes a melted belt.

I work at a custom shop and every time like clockwork the customer asks for a pretty pulley, and every time I have to sand the groove of the pulley. If I forget I always get 11-12v and a nice burn on my hands when I investigate the pulley. Left alone, the belt will go in and out of times when it grips and when its either melting or slipping.

The other likely possibility has been mentioned; high RPMs and either slightly misaligned pulleys or a slightly loose belt could have caused the belt to flip which will melt it as well.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 09-01-2008, 08:32 PM
1969NovaSS's Avatar
turbo lag......yeeeeehaaaaaaw
 
Last photo:
Join Date: Feb 2005
Location: oxnard,ca
Age: 27
Posts: 678
Wiki Edits: 0

Thanks: 0
Thanked 1 Time in 1 Post
Yes it is a chrome alt with a chrome pulley only because it was more expensive for a painted one. I have no problem getting 14v at idle and if the belt isn't tight it will scream when the fan comes on. Ill take that pulley off and buy the z/28 and see what happens.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 09-01-2008, 10:10 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: Pittsburgh, PA
Age: 40
Posts: 5,128
Wiki Edits: 16

Thanks: 0
Thanked 1 Time in 1 Post
Easy fix, then.

Take the belt off, take a folded piece of coarse grit sandpaper (maybe somewhere between 150 and 80 grit) and scuff up the groove. Seriously, it doesn't need to be much. If you spend more than 5 minutes on it you spent too long Just break the glaze that's all you need.
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
How did this happen? EazyDuzIt102 Engine 49 10-17-2005 10:35 PM
what would happen if i didnt pay? happycamperbus General Rodding Tech 46 03-23-2005 05:23 PM
how would this happen?!?! red_rider52 Transmission - Rearend 12 01-18-2005 09:23 AM
Anyone had this happen??? ets1945 Hotrodders' Lounge 12 03-31-2004 08:40 PM


All times are GMT -6. The time now is 04:57 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.