Author Topic: John Z vacuum seyup  (Read 5489 times)

fireZ

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John Z vacuum seyup
« on: April 16, 2010, 07:27:53 PM »
Does anyone have a picture of John Z vacuum setup. My 302 is running alright and I was wondering about doing Johns setup on the car. Do I need to do any other changes when I do the vacuum setup John suggests
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #1 on: April 16, 2010, 08:23:09 PM »

fireZ

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Re: John Z vacuum seyup
« Reply #2 on: April 17, 2010, 12:31:07 AM »
Thanks for getting that for me
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #3 on: April 17, 2010, 12:55:46 AM »
Your welcome. If only my memory continuously operated at 100% peak efficiency.

fireZ

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Re: John Z vacuum seyup
« Reply #4 on: April 17, 2010, 01:01:56 AM »
Yes if I could remember what I use to know .Have you tried this vacuum hookup.Did it work without any other adjustments to the engine?
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #5 on: April 17, 2010, 01:47:49 AM »
If you mean from ported to full, I did as per John's advice. I only adjusted the carb afterwords for optimum vacuum. But I also changed my can to an Echlin VC-1810.

fireZ

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Re: John Z vacuum seyup
« Reply #6 on: April 17, 2010, 11:29:39 AM »
Yes I am going to the full vacuum from ported. Is the idle at the carb the only thing to readjust? Thanks again
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #7 on: April 17, 2010, 11:44:24 AM »
Pretty much, unless you want to check dwell/timing while you have your head under there.

fireZ

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Re: John Z vacuum seyup
« Reply #8 on: April 17, 2010, 07:34:32 PM »
I am having some difficulty finding the vacuum advance that John Z recommends. Any idea where they can be bought?
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #9 on: April 17, 2010, 08:19:58 PM »
GM Parts Direct.
Or:
AC-Delco #D1316A or D1312C
Niehoff DR305
Borg-Warner V329
Standard VC-177
GM #1116236
Did you read the 4 pages in the link I posted? It's in there.

fireZ

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Re: John Z vacuum seyup
« Reply #10 on: April 18, 2010, 02:52:50 AM »
Yes I did read it and checked 3 different suppliers. I did not find a store that had any of them listed in stock. I will keep looking. Thanks
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #11 on: April 18, 2010, 08:34:42 AM »
I hunted briefly: http://www.amazon.com/ACDelco-D1312C-Distributor-Vacuum-Control/dp/B000C9OKNM/ref=pd_rhf_p_t_1

I got one at GMPD but can no longer locate it on their site.

fireZ

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Re: John Z vacuum seyup
« Reply #12 on: April 18, 2010, 01:06:31 PM »
Thanks I will try and order one
1968 Z28 LA Built
LIC # RPO Z28

Mark

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Re: John Z vacuum seyup
« Reply #13 on: April 18, 2010, 02:17:55 PM »
Rockauto.com has one VC-177 left for about 3 bucks.

They also list the D1316C as being a non stock item available for 14.38.

I've got half a dozen of various Vacuum advance cans that I bought while I was searching for the best one for my car.
Mark C.
1969 Indy Pace Car
350/300HP RPO Z11

JohnZ

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Re: John Z vacuum seyup
« Reply #14 on: April 18, 2010, 02:51:59 PM »
I buy quite a few of them, and GMPartsDirect.com has them - GM #88924985, AC-Delco #D1312C. Only one company makes them (Standard), and the others re-box them; all are stamped "B28" on the bracket. They used to be boxed as the VC-1810 - starts pulling at 4" Hg., fully-deployed at 8" Hg., providing 15*-16* of advance.
'69 Z/28
Fathom Green
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fireZ

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Re: John Z vacuum seyup
« Reply #15 on: April 19, 2010, 12:36:38 AM »
I will go to the local GM dealer tomorrow and see what I can find out. Thanks for everyones help
1968 Z28 LA Built
LIC # RPO Z28

L78 steve

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Re: John Z vacuum seyup
« Reply #16 on: April 19, 2010, 04:54:34 PM »
From what I've been told the B28 can has  been discontinued for some time. You will have to call around with the numbers supplied in this post to try to find one in stock somewhere.
69 Z/28 Dover White X33,ZL2,PS,M20,Std.int.04C
67 SS/RS Mt. Green 1W,2LGSR,3SL,4K,5BY,07C
70 Nova L78 Blk. Cherry,Sandalwood,M21,02B

fireZ

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Re: John Z vacuum seyup
« Reply #17 on: April 19, 2010, 09:22:18 PM »
Called around and cannot seem to find a B28 canister. My car has a B16 now and with Johns vacuum setup the car is a lot more streetable for cruising. Thanks all  Paul B
1968 Z28 LA Built
LIC # RPO Z28

Sauron327

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Re: John Z vacuum seyup
« Reply #18 on: April 20, 2010, 01:32:08 AM »
GM Parts Direct has them, I ran the number John posted and it's in stock. So does the other link I posted. So if you want one you can get one. Calling around will not prove successful. My supplier can't get one either.
« Last Edit: April 20, 2010, 01:57:28 AM by Sauron327 »

fireZ

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Re: John Z vacuum seyup
« Reply #19 on: April 20, 2010, 12:02:01 PM »
Called GM anough at 12 dollars they are only available in the States. It will take 10 days to get a couple shipped up to Canada. Seem cheap en
1968 Z28 LA Built
LIC # RPO Z28

L78 steve

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Re: John Z vacuum seyup
« Reply #20 on: April 20, 2010, 12:47:17 PM »
Get the B28 if you can. They are ideal for High perf. low vac. engines.
69 Z/28 Dover White X33,ZL2,PS,M20,Std.int.04C
67 SS/RS Mt. Green 1W,2LGSR,3SL,4K,5BY,07C
70 Nova L78 Blk. Cherry,Sandalwood,M21,02B

JohnZ

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Re: John Z vacuum seyup
« Reply #21 on: April 20, 2010, 01:51:23 PM »
I buy them six at a time from GMPartsDirect.com for $6.50 each.
'69 Z/28
Fathom Green
CRG

fireZ

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Re: John Z vacuum seyup
« Reply #22 on: April 23, 2010, 12:55:07 AM »
I was able to drive across the border today and buy a couple B28 cannisters. Installing it tonight.
1968 Z28 LA Built
LIC # RPO Z28

ibfootin

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Re: John Z vacuum seyup
« Reply #23 on: May 29, 2010, 09:22:24 PM »
How do I open the pictures on reply #1

JohnZ

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Re: John Z vacuum seyup
« Reply #24 on: May 30, 2010, 02:57:44 PM »
<<How do I open the pictures on reply #1>>

They must have disappeared when the site was hacked - here they are again; this is the factory setup.
'69 Z/28
Fathom Green
CRG

JohnZ

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Re: John Z vacuum seyup
« Reply #25 on: May 30, 2010, 03:01:57 PM »
Here's the second photo of the "driving" setup, with the distributor vacuum advance line connected to the tee in the choke pull-off hose where the diverter valve signal hose was connected on the factory setup.
'69 Z/28
Fathom Green
CRG

ibfootin

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Re: John Z vacuum seyup
« Reply #26 on: May 30, 2010, 11:32:03 PM »
Thanks John

fireZ

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Re: John Z vacuum seyup
« Reply #27 on: May 31, 2010, 12:45:17 AM »
I did this setup on my 68 Z and I must say it was the best thing I have done for the car. It is crazy how much nicer the 302 is to drive just by changing the canister and doing Johns vacuum setup . It takes five minutes but what a improvement for the street.
1968 Z28 LA Built
LIC # RPO Z28