Hissing, Advance - 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 08-18-2002, 05:02 PM
66chevy2ss's Avatar
Member
 
Join Date: Jul 2002
Location: Des Moines
Posts: 202
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post Hissing, Advance

Well, thanks to your guy'ses help, I got the Nova running.

I found TDC, put all the plugs back in (no easy task - - at least for me), and took the car for a spin. It was fast!

But it still idles bad, and now it makes a slight hissing sound.

Also, (this will probably qualify for the dumbest question of the year award) but when I'm doing initial timing I should be looking above the timing marker, which would mean I have to add 14 degrees to any number I get there. This is since the timing marker goes from 14 degrees to 0 degrees in the middle (and then to like 12 degrees ATDC at the bottom of the marker).

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 08-18-2002, 05:47 PM
johnnymopar's Avatar
Love your nails! You must be a Libra
 
Last photo:
Join Date: Dec 2001
Location: Stratford, ON, Canada
Posts: 599
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Talking

66, not sure about the timing degree thing, one area i know nothing about, but anyway, it sounds like you've left a vacuum port open on your carb or manifold. Make sure all your vac lines are where they should be. A hose off would cause rough idle and make the hissing noise you describe.

JB
__________________
"Well done is better than well said." - Benjamin Franklin (1706-1790)
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 08-18-2002, 05:52 PM
66chevy2ss's Avatar
Member
 
Join Date: Jul 2002
Location: Des Moines
Posts: 202
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Thanks for the response.

I know that the vacuum advance line is hooked up (from the carb to the distributor - - I just installed it).

But what other vacuum ports/hoses are you speaking of?
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 08-18-2002, 06:36 PM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Check the hose(s) that run off the vacuum port on the manifold behind the carb. Power brakes, a/c, and maybe other things run off this. Since it's close to the distributor, you may have bumped one.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 08-18-2002, 06:41 PM
MI2600's Avatar
Member# 3287
 

Last journal entry: Vortec Heads
Last photo:
Join Date: Jul 2002
Location: N. Muskegon, MI
Posts: 2,632
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

I missed your actual question about timing. Without knowing more specifics of your engine, I would initially set the timing mark at about ten degrees, with the vacuum advance disconnected and the port plugged. You can work up from there if need be.
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 08-18-2002, 07:23 PM
66chevy2ss's Avatar
Member
 
Join Date: Jul 2002
Location: Des Moines
Posts: 202
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

What I meant was that I should aiming the timing gun at the top of the marker, right?

When I turned the engine to TDC on #1, I lined up the "0" point on the marker with "TDC." Now this is right in the center of that marker, and it is difficult to see the harmonic balancer, and the corresponding numbers, behind it. But its easy enough to do when you're turning the engine really slowly. But when the engine is moving fast, its a different story.

So when I'm aiming the timing gun I have to look above the marker. The marker goes to 14 degrees BTDC.

I hope this made sense...
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 08-18-2002, 09:28 PM
aka Duke of URL
 
Last wiki edit: Finding vacuum leaks Last photo:
Join Date: Oct 2001
Location: Rockville, MD
Posts: 4,821
Wiki Edits: 1

Thanks: 0
Thanked 0 Times in 0 Posts
Arrow

[quote]...it is difficult to see the harmonic balancer, and the corresponding numbers, behind it.<hr></blockquote>

Put a small dab of white paint on the marks (timing tab and damper) that you wish to set the timing at.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 08-19-2002, 08:24 AM
Member
 
Join Date: Aug 2002
Location: Lake Elsinore, CA
Posts: 72
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Cool

You need to invest in a book called (How to hot rod a small block chevy). Its a great book and will answer a lot of your questions.

[ August 19, 2002: Message edited by: hcheetwood ]</p>
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 08-19-2002, 08:49 AM
66chevy2ss's Avatar
Member
 
Join Date: Jul 2002
Location: Des Moines
Posts: 202
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Yeah, I got one of those books. Actually, two: 1 about modifying a small block, and the other about rebuilding it.

I guess when it comes to the simple stuff, though, like how to set the timing, I have to look to a different source.

The tips I get on this site are great, for example.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 08-19-2002, 03:25 PM
72 chevy's Avatar
Member
 
Join Date: May 2002
Location: Plainville,K.S.
Posts: 242
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Ive been reading your posts 66, and thought i`d check in with ya. Hows it goin`?? Do you need more information about setting your base timing? It should be set at idle, with vacuum adv. disconnected.Your ignition will advance timing at higher RPM due to the mechanical advance, M12600 hit the nail on the head with his advice!!

[ August 19, 2002: Message edited by: 72 chevy ]</p>
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 08-19-2002, 03:49 PM
66chevy2ss's Avatar
Member
 
Join Date: Jul 2002
Location: Des Moines
Posts: 202
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Thanks for the reply. Its going o.k.

But I think the rough idle might be here to stay. The car does have a long duration cam in it. Everything seems to be configured for high rpm power: the cam, the short runner intake, 3.73 gears with the four speed manual.

So the question remains: how do I "initial time" something that won't make a smooth idle below 800-900 rpms?
Reply With Quote Quick reply to this message
  #12 (permalink)  
Old 08-19-2002, 05:27 PM
Member
 
Join Date: Aug 2002
Location: Lake Elsinore, CA
Posts: 72
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

If all else fails you can take your distributor to a speed shop that has a distributor machine. Have them set up your distributor to match your engine and driving needs. when you get it back they will tell you where to set your base timing.
Reply With Quote Quick reply to this message
  #13 (permalink)  
Old 08-19-2002, 05:33 PM
66chevy2ss's Avatar
Member
 
Join Date: Jul 2002
Location: Des Moines
Posts: 202
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

Its just the initial timing that I'm concerned about here. There's gotta' be an easier way.
Reply With Quote Quick reply to this message
  #14 (permalink)  
Old 08-19-2002, 05:44 PM
aka Duke of URL
 
Last wiki edit: Finding vacuum leaks Last photo:
Join Date: Oct 2001
Location: Rockville, MD
Posts: 4,821
Wiki Edits: 1

Thanks: 0
Thanked 0 Times in 0 Posts
Arrow

The simplest way is with the use of a advance timing light. You would merely raise the rpm's to the point that all of the advance is (say 34 degrees @3000rpm's) and set the light at that amount. Rotate the distributor to where the mark(s) come to zero, and tighten her down.

You would want to make sure the advance curve (distributor) is correct for your engine and that would require a distributor machine or you can calibrate it on the car with a 360 degree timing tape or balancer and a good quality light and tachometer.

It might sound confusing but there are ways to time it correctly.
Reply With Quote Quick reply to this message
  #15 (permalink)  
Old 08-19-2002, 06:09 PM
66chevy2ss's Avatar
Member
 
Join Date: Jul 2002
Location: Des Moines
Posts: 202
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Post

I don't think my timing light is like the one you speak of. For one thing, it doesn't have a "dial" on the front. Its of good quality, I think. I just bought it. To be honest, I don't know what an advance timing light does.

Is it possible to do with what I have?
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 09:02 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.