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Author Topic: Timing  (Read 1634 times)

Henry Cloutier

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Timing
« on: March 06, 2023, 12:38:21 AM »
Hey you all,
What's the best way to re-plumb the vacuum advance canister to manifold vacuum from ported vacuum? I've got the distributor out and sent to Jerry for rework so it seems a good time to make the modification. Can I "Y" the pull off hose or do I need to find a fitting to take from the brake booster?

Thanks!
Hank
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169INDY

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Re: Timing
« Reply #1 on: March 06, 2023, 01:44:20 AM »
John Z's car is a great example.

Here is mine
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Jim
68 SS/RS L35 Th-400 LOS
69 Pace Car L48 Th-350 LOS
68 Z28 M21 LOS

Stingr69

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Re: Timing
« Reply #2 on: March 06, 2023, 03:36:00 PM »
I assume Jerry is providing you with a "B28" vacuum canister?  It's a must to getting the manifold vacuum advance working on a 302, or any low vacuum idle application.  Getting hard to find these days.
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Henry Cloutier

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Re: Timing
« Reply #3 on: March 06, 2023, 10:17:21 PM »
Thanks for the pic! Worth a thousand words as they say :-)
I'll check on the B28 canister, I would hope so.
They have received the distributor but have not started processing yet.
Best regards,
Hank
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jeff68

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Re: Timing
« Reply #4 on: March 08, 2023, 01:53:44 PM »
I converted to full manifold vacuum on my 68 L30 327 many years ago, but I had to make modifications to support the change.  Initial static timing, vacuum advance canister, mechanical advance springs & limiter - these are the changes that I can think of off the top of my head.  Just making sure that your distributor "rework" includes these modifications.  You can't just solely change the vacuum source.  If you already know all this, please accept my apologies.

There is a great article out there by John Hinckley that was published in Corvette Enthusiast entitled "Timing And Vacuum Advance 101".  If you google search that title you should find the article. 
 
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68 L30/M20 Convertible, Ash Gold
N10, F41, N34, Z21, ZJ9, Z87, D55, G80, P01, U17

Henry Cloutier

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Re: Timing
« Reply #5 on: March 08, 2023, 10:56:23 PM »
No worries,

The info is very much appreciated! I'll check with Camaro Hi Performance in the morning.

Best regards,

Hank







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msbrunner@ucdavis.edu

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Re: Timing
« Reply #6 on: March 10, 2023, 03:29:58 AM »
Here is how I did mine, inspired by JohnZ and others. Although I capped after the hard line, just to preserve the visuals of that hose plus hard line under the air cleaner 8)
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~Matt
'69 02D RS Z/28

KurtS

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Re: Timing
« Reply #7 on: March 10, 2023, 04:43:45 AM »
Quote from: jeff68 on March 08, 2023, 01:53:44 PM
There is a great article out there by John Hinckley that was published in Corvette Enthusiast entitled "Timing And Vacuum Advance 101".  If you google search that title you should find the article. 
 
Most of his articles are on the CRG site, including this one. :)  http://www.camaros.org/library.shtml#report
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Kurt S
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Henry Cloutier

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Re: Timing
« Reply #8 on: March 10, 2023, 12:06:50 PM »
Nice Installation and yes I have printed the article!

Best regards,

Hank
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