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Date: Mon, 8 Sep 1997 04:00:41 -0600 (MDT)
From: owner-fordtrucks-digest ListService.net (fordtrucks-digest)
To: fordtrucks-digest ListService.net
Subject: fordtrucks-digest V1 #200
Reply-To: fordtrucks ListService.net
Sender: owner-fordtrucks-digest ListService.net


fordtrucks-digest Monday, September 8 1997 Volume 01 : Number 200



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Ford Truck Enthusiasts - 1979 And Older Trucks Digest
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In this issue:

Re: Timing ["Gary, 78 BBB" ]
Re:Timing [danadeb pacbell.net]
Searching for VIN---HELP [Joe DeLaurentis ]
RE: Timing, vacs and stuff [Kevin Kemmerer ]
RE: timning, advance, etc. [Kevin Kemmerer ]
Re: Spray on Bedliners? Yes or No? ["Deacon Blues" ]
Re: pilot bearing removal [OldTrux aol.com]
12 Volts ["Don & Teresa Neighbors" ]
Re: Timing ["Donald R. Screen" ]

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Date: Sun, 7 Sep 1997 14:55:58 +0000
From: "Gary, 78 BBB"
Subject: Re: Timing

> From: "art l"
> Subject: Timing
> Date: Sun, 7 Sep 1997 11:26:08 -0700

> the electronic vac. advance. Okay 78 F-250, 400M, Carter 4v,
> Edelbrok performer. Under normal driving it runs fine, but when It
> is under a load like going up a hill or towing it pings, it seems
> like it does it when I am giving the engine alot of gas but the RPMs
> are low, because if the trans mission kicks down and the RPM comes
> up it will stop. The vacume is comming off the ported valve on the

I don't know how to make it work off the ported tap but the problem
you need to solve is that it's not backing out far enough at WOT to
account for the faster burning of the charge so it pings.

I backed my initial out to 8 degrees and also backed the spring
pressure off on the vac to allow more advance to be pulled in at a
lower vacuum (higher manifold pressure, less in of hg) and kept my
cruise, light throttle and throttel response but got rid of the ping.

What I have discerned from my fooling around is that the engine needs
lots of advance at cruise (45 - 50 deg's) with light throttle
(equilibrium) and also at idle so without the vac you can't get it
and economy will suffer but at near WOT you need less advance,
roughly whatever the mechanical is at so the vac needs to fully
retard. I don't know if it does that with the ported and don't have
one on my carb so I can't test it either but that's exactly what it
does with manifold vac and it works quite will on my 351M bronco with
33's and 3.5 gears.

The swift of foot and slow of wit
have more off road experiences

- -- Gary --

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Date: Sun, 07 Sep 1997 13:17:47 -0700
From: danadeb pacbell.net
Subject: Re:Timing

Art,

To test, disconnect the vacuum advance and try the same hill it might be
sluggish but it probably won't ping. Check your vacuum advance can and
compeer it to the one listed below. The combo below is working great for
me. (87 octane fuel in my 460) also I am running the vacuum can at its
weakest spring pressure.

You can find out what your timing is doing with a timing light, tach and
a few steps:


1) Disconnect vacuum advance.
2) With timing light read the initial advance.
3) slowly speed up the engine and watch the advance change.
4) Note the RPM when the advance starts to move.
5) Check it every 500 or so RPM.
6) And finally note the maximum it advances.

You have just established your mechanical advance curve!

7) with the engine at idle attach a vacuum pump with gauge ( a few
pieces of vacuum hose, vacuum gauge, a "T" vacuum line fitting and your
own lungs will do the same)
8) With timing light in hand increase the vacuum to the canister (RPM
will increase so be sure you stay under the RPM at which the mechanical
starts to come in. If mechanical comes in at a really low in RPM then
you can reduce the idle speed every time you increase the vacuum an
increment to keep the mechanical out of the picture.)
9) Note the amount of vacuum when the advance starts.
10) Check it in increments of 5 inches of mercury.
11) And finally note the maximum it advances

You have just established your vacuum advance curve!

Now you can start playing with various springs, vacuum cans, ETC.


I went to the wrecking yard and found two different single port advance
units( not the double port type with one port blocked. Also keep in mind
I am in California, and the junk yard cars are mostly from around here
and some of the parts may be California only )The one that worked still
had the OEM dist tag on the dist ( helps in the future. )It has the
following markings:

C41 under the can, 12 on the arm that attaches to the pickup plate in
the dist, an internal stop that limits vacuum advance to about 20 deg's
and it has a relatively soft spring ( as compared to the other type I
found)

The dist. tag reads as follows:
82
D7AE
2127
UA
8L 17

Other then the D7A = 1977, full-size, I have no idea what the tag means.

The other vac canister has the following markings:

C37 under the can, 10 on the arm that attaches to the pickup plate in
the dist, no internal stop so the vacuum advances to about 30-40 deg's
and it has a relatively stiff spring ( as compared to the C41 type )


The C41 can's 20 deg's, with 8 deg's initial, and 10 deg's mechanical
give me 38 deg's total. Almost no ping climbing a steep hill on a
relatively hot California afternoon using 87 octane gas.

Good luck
Dana

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Date: Sun, 07 Sep 1997 17:04:57 -0400
From: Joe DeLaurentis
Subject: Searching for VIN---HELP

Is it me am I retarded...I've looked on both fram rails for my Vin
on my 68 F-100..Could it be under the power steering box???It is on
the top of the frame..right??Is it stamped any where else???Anybody
with a 67-72 that found theres please respond.
Joe

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Date: Sun, 7 Sep 1997 17:19:32 -0400
From: Kevin Kemmerer
Subject: RE: Timing, vacs and stuff

my MSD destributer gives 28 deg max mech. timing advance. (part#8580)
it comes with 3 other stops that limit it down to a minumum of 18 deg.
it also comes with springs that can be changed to bring in full advance from 2500 to 5500 rpm.
i have the advance on mine locked out to use the timing computer.
this mech. advance of 28 + inital of say 10 gives total of 38 without any vacuum.

sleddog

- ----------
From: Gary, 78 BBB[SMTP:gpeters3 ford.com]
Sent: Sunday, September 07, 1997 7:22 AM
To: fordtrucks ListService.net
Cc: bigbroncos off -road. com
Subject: Re: Timing, vacs and stuff

> From: danadeb pacbell.net
> Date: Sun, 07 Sep 1997 02:57:05 -0700
> Subject: Re: Timing, vacs and stuff

> THIS IS NOT A FLAME!
> It is just my two cents worth.
>
> The mechanical advance responds to engine SPEED only.....

---

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