97up-list-digest Thursday, May 21 1998 Volume 01 : Number 089



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Ford Truck Enthusiasts - 1997 and Newer Trucks and Vans
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In this issue:

Re: FTE 97up - Exhaust Brake for Super Duty
Re: FTE 97up - Recall on 97 & 98 Ford Trucks
[none]
Re: FTE 97up - Exhaust Brake for Super Duty
Re: FTE 97up - Recall on 97 & 98 Ford Trucks
FTE 97up - Exhaust Brakes
FTE 97up - Absolutely Nothing Important
FTE 97up - ADMIN: Community Service Opportunity
FTE 97up - ADMIN: April archives
FTE 97up - Upgrade for 96 Stroker

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Date: Wed, 20 May 1998 09:29:42 -0400
From: Chad Royse
Subject: Re: FTE 97up - Exhaust Brake for Super Duty

The exhaust valve springs have a lot to do with it. If the back pressure from the
exhaust brake is greater than the exhaust springs, then when the piston is in the
intake stroke, it will push open the valve and back flow exhaust gasses into the
cylinder. You don't want this.

Why would it ever feed back through the intake valves?

Chad

WiNk wrote:
>
> When the both valves are closed the valve springs have nothing to do with the back
> pressure. The pressure is in the cylinder and not on the valve spring side of the
> force. Preventing the exhaust from exiting would increase cylinder pressure when
> both valves are closed. Also you have to consider that the back pressure could
> feed back through the intake valves. Am I missing something here?
>
> RAMWORKER wrote:
>
> > In a message dated 5/17/98 10:30:20 PM Central Daylight Time,
> > BigFords1 aol.com writes:
> >
> > >
> >
> > Hi David,
> >
> > Check out http://www.ford-trucks.com//lc/lc.php?action=do&link=http://www.bd-vfi.com
> > It's a device similar to the old heat riser valves used on gasoline engines,
> > it's use on diesels is to create pressure in the cylinders to cause a
> > compression braking effect, which diesels don't have because of their
> > "unthrottled design." It is designed to not overcome the exhaust valve spring
> > tension with the associated destruction this would cause, i.e., less
> > backpressure than the exhaust spring can overcome.
> >
> > Best Regards,
> > Robert Stout
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------------------------------

Date: Wed, 20 May 1998 10:02:43 -0400
From: hunter cyberstreet.com (Michael Kisielewski)
Subject: Re: FTE 97up - Recall on 97 & 98 Ford Trucks

WiNk Wrote

>KEn.
SNIP
> Things that whine shudder and clunk will break at some time or other.

snip

I can attest for that. My two year old kept whining and clunking around
the house and eventually broke her arm. Just a bit of parental humor.

Michael

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

Date: Wed, 20 May 1998 07:57:43 -0700
From: Keith Srb
Subject: [none]

Does anybody know of a place to get replacement parts for a sliding rear
window, or do you have to replace the entire window?

The Latch on my Slider has broken off.

Thanks!

Keith Srb herbie netvalue.net
http://www.ford-trucks.com//lc/lc.php?action=do&link=http://members.netvalue.net/herbie
Mesa, AZ
1986 Ford Bronco II, 2.9L (I HATE LITERS) V-6, Mitsubishi 5-Speed.
1980 Harley Davidson, XLH, Rebuilt from the frame up.
1974 Ford F250 Ranger XLT, Camper Special, 390ci 4bbl, Automatic, Long Box,
Style Side.
1966 Ford F100, 240 C.I. Straight Six, Model 1100 1bbl carb, Oil Bath Air
Cleaner, Warner T-18 4-Speed, Short Box Style Side.
My Blood runs "TRUE BLUE FORD on Four Wheels and Pure HARLEY on Two Wheels!"
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------------------------------

Date: Wed, 20 May 1998 12:33:57 -0700
From: WiNk
Subject: Re: FTE 97up - Exhaust Brake for Super Duty

chad,
One of us is backwards here. The CAM pushes the valve open, not the spring. The valve
spring CLOSES the valve. What am I missing?

Chad Royse wrote:

> The exhaust valve springs have a lot to do with it. If the back pressure from the
> exhaust brake is greater than the exhaust springs, then when the piston is in the
> intake stroke, it will push open the valve and back flow exhaust gasses into the
> cylinder. You don't want this.
>
> Why would it ever feed back through the intake valves?
>
> Chad
>
> WiNk wrote:
> >
> > When the both valves are closed the valve springs have nothing to do with the back
> > pressure. The pressure is in the cylinder and not on the valve spring side of the
> > force. Preventing the exhaust from exiting would increase cylinder pressure when
> > both valves are closed. Also you have to consider that the back pressure could
> > feed back through the intake valves. Am I missing something here?
> >
> > RAMWORKER wrote:
> >
> > > In a message dated 5/17/98 10:30:20 PM Central Daylight Time,
> > > BigFords1 aol.com writes:
> > >
> > > >
> > >
> > > Hi David,
> > >
> > > Check out http://www.ford-trucks.com//lc/lc.php?action=do&link=http://www.bd-vfi.com
> > > It's a device similar to the old heat riser valves used on gasoline engines,
> > > it's use on diesels is to create pressure in the cylinders to cause a
> > > compression braking effect, which diesels don't have because of their
> > > "unthrottled design." It is designed to not overcome the exhaust valve spring
> > > tension with the associated destruction this would cause, i.e., less
> > > backpressure than the exhaust spring can overcome.
> > >
> > > Best Regards,
> > > Robert Stout
> = Ford Truck Enthusiasts ==============================================
> Send posts to: 97up-list ford-trucks.com
> Send unsubscribe requests to: majordomo ford-trucks.com with
> "unsubscribe 97up-list" in the message body.
> =======================================================================





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

Date: Wed, 20 May 1998 18:48:45 -0400
From: "Ann Mitchell"
Subject: Re: FTE 97up - Recall on 97 & 98 Ford Trucks

- -----Original Message-----
From: WiNk
To: 97up-list ford-trucks.com
Date: Wednesday, May 20, 1998 2:00 AM
Subject: Re: FTE 97up - Recall on 97 & 98 Ford Trucks


Wink how many miles were on the truck when you first noticed the rear end
and trani whining?

Steve

>KEn.
>Th rear end is 3.55 with a 4.6 and towing package. I'm certain (but
haven't
>checked it out) that the rear is a straight cut gear. If so that type of
gear does
>whine at some speed but is less costly to machine.
>
>An alternator whine that comes and goes is a defective alternator as far as
I am
>concerned. A transmission that whines at increasing loudness is also a BAD
>transmission. Things that whine shudder and clunk will break at some time
or
>other. I haven't heard any other vehicles whine like this one does.
>
>


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

Date: Wed, 20 May 1998 19:56:55 EDT
From: RAMWORKER
Subject: FTE 97up - Exhaust Brakes

Hello List!

There seems to be some continuing interest in how exhaust brakes work. I
will try to explain it the way I understand it, and hope it will be clear to
you.

Bear in mind: 1. We're talking about 4 cycle internal combustion engines
2. We're talking about MEDIUM duty diesel engines in
pickups
3. I know almost nothing about REAL Jake brakes on
heavy duty diesel engines, they're completely
different

To help you and I understand, I will start with gasoline engines, why they
have what we call "compression braking" and why diesels don't. To me,
compression braking is a misnomer, it should be called "vacuum braking" Let me
illustrate with a demonstration of "pumping losses"

Put a straw in your mouth, now breathe out through the straw, no real
problem, right? That's the pumping loss that a gasoline engine experiences on
the exhaust stroke. Now, breathe in through the straw while holding your
finger over the end of the straw, BIG problem, right? That's the pumping loss
that a gasoline engine experiences in throttle off applications, hence,
compression braking and the reason gasoline engines are so inefficient at
idle. Your finger serves as the closed throttle of the gasoline engine.

Now, let's look at pumping losses on a diesel. Breathe in and out through
the straw with your finger off of the end of the straw, no problem right?
That's the pumping loss a diesel experiences on the intake and exhaust side.
No throttle, no pumping losses :), no engine braking :(

The diesel has no throttle to introduce these pumping losses. So, if I want
engine braking, I must introduce some pumping losses into the engine.

OK, if that's clear, I decide that I need engine braking on my pickup, what
to do? Introduce pumping losses under controlled conditions. How to do it?
Get an exhaust brake! Works this way, throw a switch, return the fuel
injection pump to idle conditions, and the exhaust brake engages, creating
pressure in the exhaust system, downshift the transmission to raise the RPM's
so as to create more kinetic energy in the engine, and I've just simulated
compression braking, however, the effect is exactly the same. The engine and
truck slow down without using the service brake.

Braking is also rated as horsepower, just like the engine. So, just like a
gasoline engine, if I want maximum engine braking, I need more RPM's.
Horsepower = (Torque x RPM) / 5252. Horsepower can stop the truck, just as it
can accelerate the truck. So RPM's are important for engine braking, so is
backpressure, the more, the better for engine braking. But, I must be careful
here, to not introduce more backpressure than the exhaust valve springs can
deal with. If my exhaust valve springs are rated for maximum backpressure of
35 p.s.i., and I install an exhaust brake which can introduce 60 p.s.i., I've
got serious problems. Keep in mind pressure differentials between cylinders,
and the exhaust system, I've got 60 p.s.i. in the exhaust system, and another
cylinders' exhaust valve begins to open, and that cylinder has less than 60
p.s.i. in it. That valve is going to tend to "blow" open, i.e., off the cam
lobe, similar to valve float, the piston hits the valve, and my day is ruined.
This is extremely bad in a high compression engine, as there is very little
room for error in the cam timing. I don't need the piston and the valve
trying to occupy the same space at the same time, or hitting each other.

I hope I've not created more confusion, but if I have, fire up the questions
and I'll try to answer them.

Best Regards,
Robert Stout
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------------------------------

Date: Wed, 20 May 1998 21:41:00 -0400
From: Ken Payne
Subject: FTE 97up - Absolutely Nothing Important

Forwarded for: Chad Royse
>X-Mailer: Mozilla 4.05 [en] (Win95; I)
>MIME-Version: 1.0
>To: Ford 97-Up
>Subject: Absolutely Nothing Important
>Content-Type: text/plain; charset=us-ascii
>Content-Transfer-Encoding: 7bit
>
>Anybody ever see that big Sony-Semi going around taking people's pictures for
>America's Digital Yearbook? It stopped at my work today. If you ever wondered what
>my ugly mug looked like check it out at http://www.ford-trucks.com//lc/lc.php?action=do&link=http://www.vaio.net/spte.dll/truck/Chadly.
>
>If you go, sign my guest book at the bottom. I want to see how many Ford nuts I can
>g*t on it.
>
>C-ya Ford Nuts,
>Another Ford Nut
>
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------------------------------

Date: Wed, 20 May 1998 22:11:04 -0400
From: Ken Payne
Subject: FTE 97up - ADMIN: Community Service Opportunity

At the Pigeon Forge show, some of us discussed the idea of becoming involved in community activities. Well, here is our first opportunity to show our stuff. Please see the email we received below.

Ken is going to send Ms. Edsall some information on the history of the Ford truck. Anyone else who would like to participate, please send your mail directly to her, but be sure to mention that you are a list member so she will know where the mail is coming from.
Thanks in advance for your time.

Peggy Payne
Coadministrator, Ford Truck Enthusiasts

>Return-Path:
>Reply-To: "Edsall Family"
>From: "Edsall Family"
>To:
>Date: Wed, 20 May 1998 19:57:56 -0400
>X-MSMail-Priority: Normal
>X-MimeOLE: Produced By Microsoft MimeOLE V4.72.2106.4
>
>
>
>My third grade class is studying big trucks and trucking for a project for
>our annual school wide reading week. Our theme is a "truckload of books".
>I am hoping that you can send us some information about Ford trucks that we
>could use. Anything that the children would find useful and interesting
>would be greatly appreciated. Thank you very much.
>
>Virginia Edsall
>Lyme Central School
>Chaumont, New York 13622
>---------------------------------------
>The Edsall Family edsall 1000islands.net
>29031 Stony Point Road
>Cape Vincent, NY 13618
>
>
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------------------------------

Date: Wed, 20 May 1998 22:53:59 -0400
From: Ken Payne
Subject: FTE 97up - ADMIN: April archives

April archives are now on the web site.

Ken Payne
CoAdmin, Ford Truck Enthusiasts
http://www.ford-trucks.com
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------------------------------

Date: Thu, 21 May 1998 00:29:28 EDT
From: BigFords1
Subject: FTE 97up - Upgrade for 96 Stroker

My friends Grandpa just died and left him a brand new F-350 Super Duty Power
Stroke. But he sold it because the bills were to much for him. He also has a
96 Power Stroke. He wants me to find out if he could upgrade it to be as good
as the new diesel. He wants to put the new intercooler and turbo in the old
engine. Is it possible? If so, what needs to be done? Thanks.


David

PS here is a link to my site---->
BigFords1's Home Page
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