305 timing at 40+ degrees - Page 2 - El Camino Central Forum : Chevrolet El Camino Forums
El Camino Central Forum : Chevrolet El Camino Forums
 
Ground Up
Notices

User Name
Password

Reply
 
Thread Tools Display Modes
  #16  
Old 11-05-2019, 10:25 AM
fauxrs fauxrs is offline
Senior Member

Master Wrench
 
Join Date: Feb 2012
Name: EaR
Year: 1966
Model: El Camino
Region: 18(CA)
NECOA #: 21184
Posts: 2,037
fauxrs has a reputation beyond reputefauxrs has a reputation beyond repute
Default

Couple of questions I haven't seen yet.


The emissions sticker for the 80 Camino with the 5 litre (305) call for 6 degrees @ 500 rpm (with the vehicle in drive). You say its at 41 degrees with the vacc advance disconnected.


Oddly enough this is almost exactly the total timing the oem system was designed to provide. In 1980 the LG4 in the El Camino had 6 degrees initial, 20 degrees mechanical (@ 3800 rpm) and 16 degrees vacc (@40 kPa about 12 in. mercury) [6+20+16 = 42] this leads me to believe your system may have a stuck advance system.




You say entire ignition system is new except plug wires: by this you mean out-of-box new, not just new parts installed into old distributor?
  • If so, whose distributor?
  • What rpm is the motor at when you set the timing?
  • Does the rpm climb when you hook up the vacc advance cannister?
  • Have you checked the timing with it connected?
Now a few things to check, most of which assumes an old distributor with new parts:

  • Remove the cap and rotor and examine the weights, are they up against the center pole of the distributor or are they slightly extended, when you pull the weights out do they spring back to the center of the distributor. What we are looking for is sticking advance weights. If the advance weights are going full advance the moment it starts then yes dialing it back to 12 degrees would make a dog. Because 12 degrees would be your full advance.
  • Test the vacc advance with a hand held vacc pump, with the engine idling and a timing light on, pump the hand pump slowly and watch the timing mark, note how much vacc was introduced at the hand pump and note how many degrees of advance at that vacuum. If nothing is added then either the vac advance is broken or the breaker plate in the distributor is stuck.
To best check this you will need the vacc hand pump, and a decent dial back timing light. also a vacc guage to determine you manifold vaccum at idle.
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #17  
Old 11-05-2019, 01:01 PM
Rlbeaver Rlbeaver is offline
Member
Knuckle Buster
 
Join Date: Mar 2019
NECOA #: 90354
Posts: 50
Rlbeaver will become famous soon enough
Garage
Default

new distributor with cap rotor and ignition coil and hei module all accell. got it for free from a buddy that had it still in box just sitting. as for the advance I have moved it manually and it seems to move freely and spring back just fine, i have not checked advance with vacuum pump yet. I will check to see if idle changes with vacuum hooked up or not and see what I come up with.
Reply With Quote Quick reply to this message
  #18  
Old 11-05-2019, 01:43 PM
JJLT1's Avatar
JJLT1 JJLT1 is offline
Senior Member
Master Wrench
 
Join Date: Jul 2008
Name: JJ
Location: South of Houston
Year: 1985
Model: El Camino SS
Region: 13(TX)
NECOA #: 12122
Posts: 11,520
JJLT1 has a reputation beyond reputeJJLT1 has a reputation beyond reputeJJLT1 has a reputation beyond repute
Garage
Default

have you tried the welding rod trick yet ??
__________________
JJ
85-SS 95-LT1-383 4L60 8.5-3.73
To view links or images in signatures your post count must be 0 or greater. You currently have 0 signatures.


To view links or images in signatures your post count must be 0 or greater. You currently have 0 signatures.
Reply With Quote Quick reply to this message
 
  #19  
Old 11-05-2019, 06:29 PM
hotrodelco's Avatar
hotrodelco hotrodelco is offline
Senior Member

Master Wrench
 
Join Date: Jun 2012
Name: Ralph
Location: Leakey, TX
Year: 1981
Model: El Camino
Region: 13(TX)
NECOA #: 22020
Posts: 2,409
hotrodelco has a reputation beyond reputehotrodelco has a reputation beyond repute
Garage
Default

I have the same thing going on with a GM crate engine that a customer brought me.
When I found out the pointer was off, just tuned it by ear and seat of the pants.
__________________
Once you go Rat, you never go back!
To view links or images in signatures your post count must be 0 or greater. You currently have 0 signatures.


Guess what happens after your offended?
Nothing!
That's it!
Now be an adult and move on.
To view links or images in signatures your post count must be 0 or greater. You currently have 0 signatures.
!
To view links or images in signatures your post count must be 0 or greater. You currently have 0 signatures.
Reply With Quote Quick reply to this message
  #20  
Old 11-06-2019, 08:45 AM
Rlbeaver Rlbeaver is offline
Member
Knuckle Buster
 
Join Date: Mar 2019
NECOA #: 90354
Posts: 50
Rlbeaver will become famous soon enough
Garage
Default

I have not tried welding rod trick, or finding TDC on one yet, I will likely have to pull headers to get to it, or possibly use coat hanger and bend it around header. for now it seems to be running good according to the butt in seat test and breaks the tires loose with ease at lower speeds. I will update once I get a chance to sort this out, currently having to put a clutch in family members hyundai not near as much fun as working on the elco...
Reply With Quote Quick reply to this message
  #21  
Old 11-06-2019, 06:06 PM
87ls5.3's Avatar
87ls5.3 87ls5.3 is offline
Site Contributor

Master Wrench
 
Join Date: Jun 2019
Name: Joe
Location: NE Fort Worth
Year: 1987
Model: Conquista
Region: 13(TX)
NECOA #: 90940
Posts: 213
87ls5.3 has a spectacular aura about
Garage
Default

Butt in seat test and breaks the tires loose with ease at lower speeds is where I quit worrying about the timing. I bought a timing light in the early 80's and since the mid 80's I'm not sure where it is. I've used the "butt in seat" test since then and just advanced the timing till it made some clatter accelerating then backed it off a couple degrees and called it a day. I'm sure someone might object to my simpleton way, but back to, "breaks the tires loose with ease at lower speeds"?

YMMV.......

Joe
Reply With Quote Quick reply to this message
  #22  
Old 11-07-2019, 02:33 PM
JJLT1's Avatar
JJLT1 JJLT1 is offline
Senior Member
Master Wrench
 
Join Date: Jul 2008
Name: JJ
Location: South of Houston
Year: 1985
Model: El Camino SS
Region: 13(TX)
NECOA #: 12122
Posts: 11,520
JJLT1 has a reputation beyond reputeJJLT1 has a reputation beyond reputeJJLT1 has a reputation beyond repute
Garage
Default

you can put the welding rod in #6 hole if its easy-er to get to,
1 and 6 are up at the same time...
.
timing lights are cheap compared to pistons..
especially with most motors getting Hyper-glass pistons now days..
with a louder than normal exhaust, or stereo you wont hear the noise,,
and a knock sensor can hear it way before we can..
.
Reply With Quote Quick reply to this message
  #23  
Old 11-07-2019, 08:02 PM
87ls5.3's Avatar
87ls5.3 87ls5.3 is offline
Site Contributor

Master Wrench
 
Join Date: Jun 2019
Name: Joe
Location: NE Fort Worth
Year: 1987
Model: Conquista
Region: 13(TX)
NECOA #: 90940
Posts: 213
87ls5.3 has a spectacular aura about
Garage
Default

JJ, I hear ya, but the original post says 305. Has anyone ever put Hyper-glass pistons in a 305? And you're right about knock sensors being better than our own sensors. I'm thinking this motor has a timing mark issue and the welding rod trick would confirm this but a 305 that runs great with the timing questionable? I say enjoy!

Joe
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Smilies
Options

Register Now

In order to be able to post messages on the El Camino Central Forum : Chevrolet El Camino Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
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



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

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

Forum Jump

All times are GMT -7. The time now is 09:58 PM.
Powered by vBulletin® Version 3.8.8
Copyright ©2000 - 2019, vBulletin Solutions, Inc.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2019 DragonByte Technologies Ltd.
Logos and trademarks on this site are property of their respective owners. Comments are property of their posters, the rest 2001-2009 by me


 

Garage Plus vBulletin Plugins by Drive Thru Online, Inc.