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Subject: perf-list-digest V2 #154
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perf-list-digest Wednesday, June 23 1999 Volume 02 : Number 154



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Ford Truck Enthusiasts - Performance
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In this issue:

FTE Perf - Re: Holley and Gas Milage
Re: FTE Perf - Re: Holley and Gas Milage
FTE Perf - Holley/mileage and introductions
FTE Perf - Electric Fans
Re: FTE Perf - Back Pressure Part 1.
Re: FTE Perf - BP Part 2.
FTE Perf - HP Clutch

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Date: Tue, 22 Jun 1999 06:27:58 -0700 (PDT)
From: Bill
Subject: FTE Perf - Re: Holley and Gas Milage

Wish,

Timing is about 10... I rebuilt the C4 about a year ago, stock torque
converter... only thing I failed to mention in my first post about
this was I had the dist (duraspark setup) recurved to 10 degrees max
vacuum and 20 degrees mechanical (and they rebuilt the dist with all
new electronics, springs, etc).

I set the idle mixture again this weekend and since it was a little
cooler in the morning, I was able to stay under the hood longer and
squeezed about 19lbs out of it and smoothed out the idle some..

As a side issue, I am having some problems with the carb and it
probably needs rebuilding... normal acceleration with just a little
throtle is smooth, acceleration under full throttle is strong and
smooth, but partial throttle, like just before you bring the
secondaries in or engage the tranny kickdown is "surgy" (if that is a
word).. not really a miss, but like a series of stumbles during the
acceleration (not the same kind of stumble like secondaries coming in
to early ...

Oh, yes, got 10.1 mpg last tank...

Bill in Texas
'64 F100 shortbox (351W/C4)
_________________________________________________________
Do You Yahoo!?

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Date: Tue, 22 Jun 1999 12:29:24 -0700
From: "Danger"
Subject: Re: FTE Perf - Re: Holley and Gas Milage

Bill in Texas wrote...

> acceleration under full throttle is strong and
> smooth, but partial throttle, like just before you bring the
> secondaries in or engage the tranny kickdown is "surgy" (if that is a
> word).. not really a miss, but like a series of stumbles during the
> acceleration (not the same kind of stumble like secondaries coming in
> to early ...
>
> Oh, yes, got 10.1 mpg last tank...
.........

It sounds like a power valve issue to me. I experienced similar problems
while experimenting with different configurations in my 69 F250.


Danger



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Date: Tue, 22 Jun 1999 12:38:41 -0700 (PDT)
From: shane san miguel
Subject: FTE Perf - Holley/mileage and introductions

Sounds like a power valve to me too. That's the part
throttle enrichment circuit, right? At 19" of vacuum
I'm guessing you should have an 85 pv in there? Might
try driving with the vacuum gauge where you can see it
and note where, in the vacuum range, the stumble
occurs. That might help you track it down.

While I'm posting..... Should say hello and introduce
myself. My name is Shane and I'm an electrical
engineer (computers). I built and raced a 289 Pinto
for 3 or 4 years before parking her and going to
school. Now I'm out of school and building a new
motor for the Pinto. I'm trying to duplicate the
Performer RPM motor sans aluminum heads, wayyyy too
much dinero for my budget. I have all the parts and
am about $400 in machining from a balanced and
blueprinted assembly. The Pinto has not been started
for about 6 years. I also drive daily a 1955 F100
pickup. It has a worn out front end and my daughter
thinks it's a circus ride. I installed a used but
fresh 85 5.0 out of a cougar. Used the motorsport
flexplate and mounted a rebuilt C4 behind it. After I
ripped the stock axle off the spring pads at the
races, I switched to a 9" out of a 59 F100 and put in
3.70 gears. The motor has a performer intake, Holley
600 vac secondary carb, headers, dual exhaust
w/crossover, and duraspark ignition. The body on the
truck is rough, and that's being kind...

My first question to the list is:

My tranny is slipping a little in 2nd gear while in
drive but not nearly as much when I shift manually.
Any ideas? Maybe a band tightening?

Shane
55 F100 5.0
15.51 87

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Date: Tue, 22 Jun 1999 17:29:57 -0700
From: George Miller
Subject: FTE Perf - Electric Fans

I need a new electric fan for my oil coolers and gulped when I saw the
current prices in Summit, etc.. Anybody have any info on commercial
manufacturers of DC fans? I need a 9-10", no biger than 10 3/4" housing.

TIA,

George Miller
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Date: Wed, 23 Jun 1999 00:21:13 -0400
From: Tim Turner
Subject: Re: FTE Perf - Back Pressure Part 1.

Chris Samuel wrote:
>
> Tim Turner and I had this thread going...
> I got bizzzzzy and had to drop it for a while.

Know the feeling.. had a too strange problem that kept us off line for a
week. 900+ messages waiting!

> For a street legal system about 5-PSI is typical IME

Actually if I see more than 3 PSI at the O2 flange I start looking for a
restriction. (at a constant 2500 RPM)

> I debated whether to note this point and decided not
> to in my original post, you rightly bring it up. My original
> comments were addressing performance and economy only; emissions
> were left out of the picture.

Sadly we have to address it. I'd rather we didn't as well. It's like
the poor guy I saw the other day that when he rebuilt his Great Mistake
4.3L used a cam marked "Not suitable for computer controlled vehicles
without modifications" and brought it tom me for a crappy idle...

> Originally I said:
>
> The Engine requires no Back Pressure to run...
> The EGR system requires Back Pressure...
> The EGR system is required by a Bureaucratic Society
> (or BS for short).

Good abbreviation! :-)

> The Engine will use fuel more efficiently with out the EGR system.

I might argue that in the newer engines.. (as stock) The needed
reduction in timing to avoid detonation would offset the savings.

> There is no BS in the Physical Laws.
> I think I'll stand by my statement!

We're on two sides of the coin; I talk about stock and you talk about
'real' engines. :-) I agree on the 'BS' and wish things were
different, but as it is I'm forced to deal with stock or near stock
engines and turn 'modified' ones away from the shop.


>
> This ends part one.
> Stay tuned as part two is headed right at ya!

Bring it on! :-)

Boy I'm glad I'm back on line.. it was a long week!

Tim
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Date: Wed, 23 Jun 1999 00:28:29 -0400
From: Tim Turner
Subject: Re: FTE Perf - BP Part 2.

Chris Samuel wrote:
>
> Well as promised here it part two.

Fascinating.. I'll reply tomorrow as I just heard Kim pull up and I
doubt she'll be patient enough to let me reply in the detail I want to!
Marking this for 'high' priority so it'll get noticed agin. :-)
>
> Tim points out:
> > But.. measuring with an analog gauge 12-24" away from the
>

Tim
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Date: Tue, 22 Jun 1999 23:31:13 -0700
From: "Danger"
Subject: FTE Perf - HP Clutch

It's about time I put a new clutch on my 69 F250 and wanted to know a
little more about them before I buy one. Since I've got a new 390 4 bbl up
front and Power-Lok Posi in the back and I enjoy burning a little rubber now
and then, I'd like to get a heavy duty clutch and pressure plate that can
really take a beating.

Thanks for any info about high performance clutch, pressure plate, and
throwout bearings.


Danger




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