Radiator Performance

[WB6WSN]

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<div style="FONT: 10pt arial">----- Original Message -----
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black">From: keith van egdom
<div style="FONT: 10pt arial">To: amphicar-lovers@yahoogroups.com
<div style="FONT: 10pt arial">Sent: Tuesday, November 23, 2004 1:48 PM
<div style="FONT: 10pt arial">Subject: Re: [amphicar-lovers] Amphicar fire gas and oil



SNIP

the top of the radiator is the only part that actually cools the motor coolant.
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<font face="Times New Roman" color="#0000ff" size="4">Keith:</font>
<font face="Times New Roman" color="#0000ff" size="4"></font>
<font face="Times New Roman" color="#0000ff" size="4">Would you explain that a bit more for me?</font>
<font face="Times New Roman" color="#0000ff" size="4"></font>
<font face="Times New Roman" color="#0000ff" size="4">Ed
El Cajon, CA USA
67 Rust Guppy
</font>

 

[rogtwo@aol.com]

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Keith,

If your engine is just warming up, the top of the radiatormay be hotter than the bottom as the thermostat is closed (or mostly closed) and not much water is flowing through the radiator. But, if you are operating under conditions where the thermostat is most of the way open (i.e., warm to hot weather with significant power demands from the engine), there will be basically no difference in temperature between the top and the bottom ofthe radiator. *

When the coolant isflowing through the radiator at a good rate, it will travel from the top of the end tank to the bottom in very little time.Also, the end tanks have no fins and minimal air flow. Thus, only a tiny bit of heat will be lost and the temperature will not be measurably different between the top and bottom of the radiator. Since the radiator is a cross-flow type, the difference in temperature occurs from side-to-side. The starboard side will be hotter than the port side.

* This is assuming the radiator core is clear so that water can flow freely through all the passages. If there is a bunch of muck in the radiator, it will tend to sink to the bottom and block the lower passages first. If the hot water can't flow through the lower passages, then, of course, the lower part of the radiator will be cooler.

Roger
White '63
Seattle



In a message dated 11/24/2004 3:21:37 PM Pacific Standard Time, amphiville@yahoo.com writes:
<blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid">
<font face="Arial">Ed,</font>
<font face="Arial"> The radiator is a cross-flow radiator. The water comes in the top of the radiator and flows across from side to side to the bottom. This is done by water being pulled out of the bottom of the radiator tothe motor by the water pump(clear as mud???) The heat is dispursed by the fan via the thin metal "strips" connected to the tubes of the radiator. The top of the radiator is the hotest part of it and is coller by the bottom.</font>
<font face="Arial"></font>
<font face="Arial">The same princible is used in the condenser of a refrigeration unit where hot gas vapor is "condensed" back to a liquid.</font>
<font face="Arial"></font>
<font face="Arial">hope this helps!</font>
<font face="Arial"> Keith</font></blockquote>

 

[keith van egdom]

Ed,
The radiator is a cross-flow radiator. The water comes in the top of the radiator and flows across from side to side to the bottom. This is done by water being pulled out of the bottom of the radiator tothe motor by the water pump(clear as mud???) The heat is dispursed by the fan via the thin metal "strips" connected to the tubes of the radiator. The top of the radiator is the hotest part of it and is coller by the bottom.

The same princible is used in the condenser of a refrigeration unit where hot gas vapor is "condensed" back to a liquid.

hope this helps!
Keith

WB6WSN <wb6wsn@cox.net> wrote:
<blockquote class="replbq" style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #1010ff 2px solid">
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<blockquote style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: #0000ff 2px solid; MARGIN-RIGHT: 0px">
<div style="FONT: 10pt arial">----- Original Message -----
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black">From: keith van egdom
<div style="FONT: 10pt arial">To: amphicar-lovers@yahoogroups.com
<div style="FONT: 10pt arial">Sent: Tuesday, November 23, 2004 1:48 PM
<div style="FONT: 10pt arial">Subject: Re: [amphicar-lovers] Amphicar fire gas and oil



SNIP

the top of the radiator is the only part that actually cools the motor coolant.
</blockquote>
<font face="Times New Roman" color="#0000ff" size="4"></font>
<font face="Times New Roman" color="#0000ff" size="4">Keith:</font>
<font face="Times New Roman" color="#0000ff" size="4"></font>
<font face="Times New Roman" color="#0000ff" size="4">Would you explain that a bit more for me?</font>
<font face="Times New Roman" color="#0000ff" size="4"></font>
<font face="Times New Roman" color="#0000ff" size="4">Ed
El Cajon, CA USA
67 Rust Guppy
</font>

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[WB6WSN]

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<div style="FONT: 10pt arial">----- Original Message -----
<div style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black">From: rogtwo@aol.com
<div style="FONT: 10pt arial">To: amphicar-lovers@yahoogroups.com
<div style="FONT: 10pt arial">Sent: Wednesday, November 24, 2004 8:00 PM
<div style="FONT: 10pt arial">Subject: Re: [amphicar-lovers] Radiator Performance



Keith,

If your engine is just warming up, the top of the radiatormay be hotter than the bottom as the thermostat is closed (or mostly closed) and not much water is flowing through the radiator. But, if you are operating under conditions where the thermostat is most of the way open (i.e., warm to hot weather with significant power demands from the engine), there will be basically no difference in temperature between the top and the bottom ofthe radiator. *

When the coolant isflowing through the radiator at a good rate, it will travel from the top of the end tank to the bottom in very little time.Also, the end tanks have no fins and minimal air flow. Thus, only a tiny bit of heat will be lost and the temperature will not be measurably different between the top and bottom of the radiator. Since the radiator is a cross-flow type, the difference in temperature occurs from side-to-side. The starboard side will be hotter than the port side.

* This is assuming the radiator core is clear so that water can flow freely through all the passages. If there is a bunch of muck in the radiator, it will tend to sink to the bottom and block the lower passages first. If the hot water can't flow through the lower passages, then, of course, the lower part of the radiator will be cooler.

Roger
White '63
Seattle



In a message dated 11/24/2004 3:21:37 PM Pacific Standard Time, amphiville@yahoo.com writes:
<blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT: blue 2px solid">
<font face="Arial">Ed,</font>
<font face="Arial"> The radiator is a cross-flow radiator. The water comes in the top of the radiator and flows across from side to side to the bottom. This is done by water being pulled out of the bottom of the radiator tothe motor by the water pump(clear as mud???) The heat is dispursed by the fan via the thin metal "strips" connected to the tubes of the radiator. The top of the radiator is the hotest part of it and is coller by the bottom.</font>
<font face="Arial"></font>
<font face="Arial">The same princible is used in the condenser of a refrigeration unit where hot gas vapor is "condensed" back to a liquid.</font>
<font face="Arial"></font>
<font face="Arial">hope this helps!</font>
<font face="Arial"> Keith</font></blockquote>
<font face="Times New Roman" color="#0000ff" size="4"></font></blockquote>
<font face="Times New Roman" color="#0000ff" size="4"></font>
<font face="Times New Roman" color="#0000ff" size="4">Sounds like a fun project to whip out the infrared non-contact thermometer and survey the heat distribution on the radiator fins. That ought to show up any clogged tubes in your radiator. What, doesn't everybody have one of those thermometers?!</font>
<font face="Times New Roman" color="#0000ff" size="4"></font>
<font face="Times New Roman" color="#0000ff" size="4">Ed
El Cajon, CA USA
67 Rust Guppy
</font>