Throttle body "carb" heat revisited

[Bill Delcambre]

Here's a shot Wayne: Does Daryl's bird have a 'throttle body injection
system' as opposed to 'port injection'? If so, the atomization of the fuel

(at the throttle body) removes a lot of heat, as it does with carburetors.

Pour some gas on your hand and see how cool it feels as it evaporates. I
don't recall ever seeing a port injected engine with a heated throttle
body... car or airplane. If the bird is port injected, then Ford just saved

a couple of bucks by utilizing an old intake manifold from a carbureted
engine.
Bill Delcambre

On 9/13/05, Wayne G. O'Shea <oifa@irishfield.on.ca> wrote:

Got to thinking while I was tearing away on Daryl's '90 T-Bird SC over th

e

last few hours...trying to find and remove a rocker cover.......

if most everyone states for aircraft usage that throttle bodies and fuel
injection don't need "carb heat' to prevent icing then why does the
throttle
body on the TBird have an engine coolant line running thru it right under
the butterfly valve??

Wayne





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[Dale Fultz]

I have to step in here a 86-92 ford vehicles with multi-port fuel injection
have a heated throttle plate on them. What we are told is that because of
the breather system for the crankcase going through the intake port near the
throttle plate the air is heated to help the oil vapor get burned rather
than mixing with cold air and causing sludge in this area. If this isn't
right I will apologize for the error but that is what we have been told. But
I can send you pictures of the heated multi ports on these and the GM cars
with mutliport use heats throttle plates also, not sure of the exact year
but I can come up with a list of them if you want it. The planes usually
doesn't reburn the oil vapors like an automobile does my engine doesn't
have pcv valve on it or a direct reburn for the crank ventilation system it
goes into the small purge and into an oil return line to the oil system.
Later Dale SR-033
----- Original Message -----
From: "Bill Delcambre" <bdaileron@gmail.com>
To: <rebel-builders@dcsol.com>
Sent: Tuesday, September 13, 2005 2:29 PM
Subject: Re: Throttle body "carb" heat revisited

Here's a shot Wayne: Does Daryl's bird have a 'throttle body injection
system' as opposed to 'port injection'? If so, the atomization of the fuel

(at the throttle body) removes a lot of heat, as it does with carburetors.

Pour some gas on your hand and see how cool it feels as it evaporates. I
don't recall ever seeing a port injected engine with a heated throttle
body... car or airplane. If the bird is port injected, then Ford just
saved

a couple of bucks by utilizing an old intake manifold from a carbureted
engine.
Bill Delcambre

On 9/13/05, Wayne G. O'Shea <oifa@irishfield.on.ca> wrote:

Got to thinking while I was tearing away on Daryl's '90 T-Bird SC over th

e

last few hours...trying to find and remove a rocker cover.......

if most everyone states for aircraft usage that throttle bodies and fuel
injection don't need "carb heat' to prevent icing then why does the
throttle
body on the TBird have an engine coolant line running thru it right under
the butterfly valve??

Wayne





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[Wayne G. O'Shea]

Thanks guys..yes the SuperCharged 3.8 is injected at each cylinder and the
throttle body is just sucking air + a small tube to somewhere that I can'
follow so assume crank case venting. Never did get enough off to be able to
remove a rocker cover....and not going to strip it any further..I put it
back together and parked it! He either dropped a valve or threw a rod
bearing, the best I can tell.

----- Original Message -----
From: "Dale Fultz" <dfultz17086@earthlink.net>
To: <rebel-builders@dcsol.com>
Sent: Tuesday, September 13, 2005 2:57 PM
Subject: Re: Throttle body "carb" heat revisited

I have to step in here a 86-92 ford vehicles with multi-port fuel

injection

have a heated throttle plate on them. What we are told is that because of
the breather system for the crankcase going through the intake port near

the

throttle plate the air is heated to help the oil vapor get burned rather
than mixing with cold air and causing sludge in this area. If this isn't
right I will apologize for the error but that is what we have been told.

But

I can send you pictures of the heated multi ports on these and the GM

cars

with mutliport use heats throttle plates also, not sure of the exact year
but I can come up with a list of them if you want it. The planes usually
doesn't reburn the oil vapors like an automobile does my engine doesn't
have pcv valve on it or a direct reburn for the crank ventilation system

it

goes into the small purge and into an oil return line to the oil system.
Later Dale SR-033
----- Original Message -----
From: "Bill Delcambre" <bdaileron@gmail.com>
To: <rebel-builders@dcsol.com>
Sent: Tuesday, September 13, 2005 2:29 PM
Subject: Re: Throttle body "carb" heat revisited

Here's a shot Wayne: Does Daryl's bird have a 'throttle body injection
system' as opposed to 'port injection'? If so, the atomization of the

fuel

(at the throttle body) removes a lot of heat, as it does with

carburetors.

Pour some gas on your hand and see how cool it feels as it evaporates. I
don't recall ever seeing a port injected engine with a heated throttle
body... car or airplane. If the bird is port injected, then Ford just
saved

a couple of bucks by utilizing an old intake manifold from a carbureted
engine.
Bill Delcambre

On 9/13/05, Wayne G. O'Shea <oifa@irishfield.on.ca> wrote:

Got to thinking while I was tearing away on Daryl's '90 T-Bird SC over

th

e

last few hours...trying to find and remove a rocker cover.......

if most everyone states for aircraft usage that throttle bodies and

fuel

injection don't need "carb heat' to prevent icing then why does the
throttle
body on the TBird have an engine coolant line running thru it right

under

the butterfly valve??

Wayne





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[Bruce Georgen]

I use an Ellison Throttle Body carb on my 0320 and it has no heat source. Ellison states that carb heat is required for its installation.

Bruce

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[Wayne G. O'Shea]

Ellison states that it >is< required? or did you mean to add a >not< after
the is?

----- Original Message -----
From: "Bruce Georgen" <bgeorgen@peoplepc.com>
To: <rebel-builders@dcsol.com>
Sent: Tuesday, September 13, 2005 8:53 PM
Subject: Re: Throttle body "carb" heat revisited

I use an Ellison Throttle Body carb on my 0320 and it has no heat source.

Ellison states that carb heat is required for its installation.

Bruce

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[Bruce Georgen]

Ellison states carb heat >is< required.

Bruce

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[Wayne G. O'Shea]

Thanks!

----- Original Message -----
From: "Bruce Georgen" <bgeorgen@peoplepc.com>
To: <rebel-builders@dcsol.com>
Sent: Tuesday, September 13, 2005 9:30 PM
Subject: Re: Throttle body "carb" heat revisited

Ellison states carb heat >is< required.

Bruce

________________________________________
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A better way to Internet
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[Ken]

A small 5/16" or 8 mm. coolant tube running through the throttle body is
fairly common on port injected engines. A preheated inlet air system
(common with Throttle body injection) is often not used on these
engines. On the Subaru that line is also a steam vent to bleed vapour
and air bubbles off the high point in the cooling system back to the
reservoir. I like the crankcase moisture theory. Unless a car engine is
in poor shape, the air should mostly flow the other way -ie into the
engine crankcase and then back out the pcv valve which is of course
downstrean of the butterfly. However at full throttle yes it will flow
out the crankcase vent as there is no manifold vacuum to run the pcv.
Another explanation that I've been given is that it is to prevent the
butterfly from seizing closed in cold weather due to the aluminum
throttle body shrinking around the brass butterfly. I've never really
believed that and always suspected it was to cater to moisture
condensation/sublimation due to the pressure (and temperature) drop
across a closed butterfly in high humidity. I believe I've seen that
occur during cold weather idling.
Ken






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