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perf-list Digest Mon, 28 Aug 2000 Volume: 2000  Issue: 132

In This Issue:
Re: Which Carb?
Re: compression
Re: Ignition options & also pinging
More carb stuff
Re: More carb stuff

----------------------------------------------------------------------

From: "Jeff Keahey" <Jeff airboatfanatics.com>
Subject: Re: Which Carb?
Date: Mon, 28 Aug 2000 07:01:26 -0500

either one should work just fine. The higher CFM is only important if you
plan on running high rpms and can be bad for lower RPM pulling. The more
important part is getting your mixture right which is kind of a pain with
the edelbrock (no exp with carter afb) the edelbrock off the shelf have
always been lean for my engines but I run mine at very high RPMs. If you do
go with the edelbrock go ahead and buy 2 sets of richer jets and 2 sets
leaner that way you will not have to drive around on a bad mix while you
wait for the right jets. The rods in an edelbrock are not as important to
change(more like fine tuning) until you get to the big blower sized jets (or
so I'm told). I have always been happy with an edelbrock because they are
much less maintenance than a Holley and still perform really well with a
good mixture. Either way you go you need to get or have a A/F ratio tester
for about $20 at AutoZone it is well worth it.

Jeff


----- Original Message -----
From: "scott" <scott ford-trucks.com>
To: <61-79-list ford-trucks.com>; <perf-list ford-trucks.com>
Sent: Sunday, August 27, 2000 7:27 PM
Subject: [perf-list] Which Carb?


> I had enough of the Motorcraft/Holley on my 84 F-250 W/460.
>  I pulled the 625 Carter AFB off of my 76 F-250 4x4 W/428 and
> installed it on the 84.The 84 runs great,but now the 76 needs
> a new AFB or Edelbrock carb.
>  I can't make up my mind,750 or 625 cfm.It ran fine with the 625
> and I'm wondering if the 750 would make it run even better or
> if I'm better off with another 625.
>  I ran the numbers at a carb size site and it stated a 600 is the
> perfect size for a 428.I also looked in my Edelbrock catalog and it
> states the
> 750 comes with a little leaner rod/jet combo than I'm currently running
> in the 625.
>  I don't think there would be any increase or decrease in the over all
> on or off road performance .I think the only difference would be at WFO.
>  Is my theory correct? Or am I better off with a 625?
>  BTW the 428 has headers 2 1/2" dual exhaust with H-pipe and 3 camber
> Flowmasters,Edelbrock performer 390 intake,Unilite Dist.,Promaster coil,
> RV cam that will be changed out to a hotter one at some point,
> 10.5 -1 compression and it is balanced.
>  The truck has a 4 spd and 4.10 gears.
> I wheel it and tow with it but it is not a daily driver.(The 84 is).
> =============================================================
> To  unsubscribe:   www.ford-trucks.com/mailinglist.html#item3
> Please remove this footer when replying.
>
>


------------------------------

From: "Hogan, Tom" <Tom.Hogan kla-tencor.com>
Subject: Re: compression
Date: Mon, 28 Aug 2000 07:28:31 -0700



>
> I'm looking at a 74 truck that has a 460 and engine compression is
> between 90 and 145.  Do you guys think it is a problem?  The
> engine has
> around 115,000 miles on it.  TIA
>
> --
> William (Tony) Whited
> 74 F100 Ranger Supercab 390
> 77 F150 Custom 460
> El Paso, TX
> Semper Fi
>
>

Sounds like a pretty wide spread to me.  The Ford shop manual doesn't
specify a certain cylinder pressure but it does state that all cylinders
should be within a certain percentage of each other.  Like 10 or 15%.  This
one is showing around a 46% difference between low and high.  I would
suspect the low cylinder as having a problem.

Tom H

------------------------------

From: "Hogan, Tom" <Tom.Hogan kla-tencor.com>
Subject: Re: Ignition options & also pinging
Date: Mon, 28 Aug 2000 07:28:35 -0700

<snip>
> Maybe someone can help me on this on too..
> I built a new motor and upped the compression rato. I used 9:1 pistons
> and had the block decked to .008. I figure I have around 9.4:1 or so??
> anyone know if I am guessing wrong?? and I am wondering if I should go
> to a colder plug. I am using stock minus the degree colder??
> Thanks..
>
> BTW: The engine specs are on my website (below) if someone is
> wondering
> about it to help give me some help. Thanks again.
> --
>
> Ezekial (Derrick)
> 93 F-150 4x4, 351, SC, SB
> 66 Fastback Stang, 289HP, 4sp
> 96 Conv. Stang, 3.8, lil add ons
> www2.mmind.net/ezekial/

Derrick
There isn't enough info above or in the web page to calculate compression
ratio.  When I  get home I will look in my shop manuals for engine specs.
The info needed to calculate compression ratio is:

Crank throw (stroke)
Rod length
Deck height
cylinder bore
compressed thickness of head gasket
volume of combustion chamber

If you know how close to the top of the deck the piston is at tdc that
measurement can be used instead of rod length and deck height.

Tom H.

------------------------------

Date: Mon, 28 Aug 2000 16:51:36 -0800
From: Ken Toop <eltopo fnord.nwinfo.net>
Subject: More carb stuff

I have had the opposite problem with my Edelbrock carb.  I'm running a 500
cfm on my 302 and it is running way too rich.  As a matter of fact, the
floats seem to be sticking open at cruising speed, causing flooding and a
loss of power.  If I put the clutch in and let off the gas, the engine will
die.  The exhaust pipes both are loaded up with carbon.  I tried a fuel
pressure regulator, set at 5 pounds (correct, as I am running a fuel
pressure gauge as well), and have checked the float level, but still the
problem.  Any ideas?

Also, I have a Ford FE to '52-'64 Ford pickup crossmember-type motor mount
conversion that I would like to sell.  $35, plus shipping.  Email me direct
if anyone is interested.



------------------------------

From: "Jeff Keahey" <Jeff airboatfanatics.com>
Subject: Re: More carb stuff
Date: Tue, 29 Aug 2000 06:41:51 -0500

I assume you are using the EPS 1404 and your should be .86 for primaries and
.95 for seconds (stock).

Do you see the problem before or after the primaries open? The secondaries
jet could be bogging your engine and leaving extra liquid fuel dripping into
your engine and that would make sense if you are dieing after coming down
off WOT. What RPM do you run at idle? Are you sure your mixture at idle is
correct about 15:1. If your good at idle then maybe you are opening up the
back to fast therefore you could go with the pink spring to stop the seconds
from opening until higher RPM and then they close earlier to stop drowning
your engine. These are just some random thoughts as I do not have enough
information to know what the problem is just some educated guessing.

Your floats are another thing all together you can adjust them fairly
easily, just follow the directions below taken directly from the owners
manual for the 1404. spray with carb cleaner before you make adjustments.
After you get it adjusted see if it still sticks.

There should be 11/32" between the airhorn gasket and the top of the outer
end of the float. To adjust the float level, bend the float lever until the
recommended level is attained. DO NOT press the needle into the seat when
adjusting the float lever. Next, you should check the float drop. Hold the
airhorn upright and let the floats hang down. There should be 1-1/4" 1/4"
between the airhorn gasket and the top of the outer end of the float. To
adjust the float drop, bend the tab on the back until the recommended float
drop is attained.

Jeff



----- Original Message -----
From: "Ken Toop" <eltopo fnord.nwinfo.net>
To: <perf-list ford-trucks.com>
Sent: Monday, August 28, 2000 7:51 PM
Subject: [perf-list] More carb stuff


> I have had the opposite problem with my Edelbrock carb.  I'm running a 500
> cfm on my 302 and it is running way too rich.  As a matter of fact, the
> floats seem to be sticking open at cruising speed, causing flooding and a
> loss of power.  If I put the clutch in and let off the gas, the engine
will
> die.  The exhaust pipes both are loaded up with carbon.  I tried a fuel
> pressure regulator, set at 5 pounds (correct, as I am running a fuel
> pressure gauge as well), and have checked the float level, but still the
> problem.  Any ideas?
>
> Also, I have a Ford FE to '52-'64 Ford pickup crossmember-type motor mount
> conversion that I would like to sell.  $35, plus shipping.  Email me
direct
> if anyone is interested.
>
>
> =============================================================
> To  unsubscribe:   www.ford-trucks.com/mailinglist.html#item3
> Please remove this footer when replying.
>
>


------------------------------

End of perf-list Digest V2000 #132
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