HOT weather..Which Coolers?
#16
08-25-2008 | 09:10 AM
Its the labor involved... the end tanks themselves are only $550 at most a pair. I ordered 3 different sets and finally came up with the 4.5" core thickness.
Intercoolers have one function, that's to cool the air coming
out of the turbo. There's a few things that can help/hinder the performance
of the intercooler. Ambient airflow through the cores to help cool the turbo'd air. For example, 20mph air gives 85% efficiency, where 10mph air gives only 50%, and that's what happens when the core gets too thick, especially in an area that doesn't have maximal airflow in the first place. The Porsche is using the negative pressure drop behind the rear tire to suck the air
through the core from the inlet behind the door. So, if the core is too
thick, it's very difficult to get air through it to assist the cooling of
the heated air.
Now, also imagine brick dimensions that's been heated to
200degF. Let it sit a while and imagine what would have happened. All
around the outside would have cooled down, but it would still be hot on the
inside... Vs. the thinner cores tending to have more surface area to
dissipate the heat and less internal volume. Ie. The 6x8x8 has
(2x(8x8))+(2x(6x8)) or 224 square inches of available surface area to
radiate heat from and only 64 square inches of area to get the cold air
through (remember we don't use the capped ends for this example) vs.the
4.5x9.4x12 core has (2x(9.4x12))+(2x(4.5x12)) or 333.6 square inches of
available surface area to radiate heat from and 112.8 sqare inches of area
to get the cold air through. Remember, the turbo can force it through, but
we're at the disposal of ambient air, heat rejection, surface area and flow
resistance to actually make the core work.
Basically, the 6x8x8 is a brick that will retain heat and work well
for a 1/4 car that can just do a quick run and be done with it, but then
you'd have to park the thing for an hour to let it cool down to do a run
again. The example I've given will cool down dramatically faster and be
more efficient steady state.
And all that and I didn't even get into the run through the core
lowering the temps so much more... Think of a 12in run vs. 8in. That means that the air is spending almost 50% more time in the core to cool down!
yayks... what did my self get into LOL anyways this is some of the stuff I and Todd K were discussing a few years back. I find it interesting so I decided to share it with all you guys...
markski
Intercoolers have one function, that's to cool the air coming
out of the turbo. There's a few things that can help/hinder the performance
of the intercooler. Ambient airflow through the cores to help cool the turbo'd air. For example, 20mph air gives 85% efficiency, where 10mph air gives only 50%, and that's what happens when the core gets too thick, especially in an area that doesn't have maximal airflow in the first place. The Porsche is using the negative pressure drop behind the rear tire to suck the air
through the core from the inlet behind the door. So, if the core is too
thick, it's very difficult to get air through it to assist the cooling of
the heated air.
Now, also imagine brick dimensions that's been heated to
200degF. Let it sit a while and imagine what would have happened. All
around the outside would have cooled down, but it would still be hot on the
inside... Vs. the thinner cores tending to have more surface area to
dissipate the heat and less internal volume. Ie. The 6x8x8 has
(2x(8x8))+(2x(6x8)) or 224 square inches of available surface area to
radiate heat from and only 64 square inches of area to get the cold air
through (remember we don't use the capped ends for this example) vs.the
4.5x9.4x12 core has (2x(9.4x12))+(2x(4.5x12)) or 333.6 square inches of
available surface area to radiate heat from and 112.8 sqare inches of area
to get the cold air through. Remember, the turbo can force it through, but
we're at the disposal of ambient air, heat rejection, surface area and flow
resistance to actually make the core work.
Basically, the 6x8x8 is a brick that will retain heat and work well
for a 1/4 car that can just do a quick run and be done with it, but then
you'd have to park the thing for an hour to let it cool down to do a run
again. The example I've given will cool down dramatically faster and be
more efficient steady state.
And all that and I didn't even get into the run through the core
lowering the temps so much more... Think of a 12in run vs. 8in. That means that the air is spending almost 50% more time in the core to cool down!
yayks... what did my self get into LOL anyways this is some of the stuff I and Todd K were discussing a few years back. I find it interesting so I decided to share it with all you guys...
markski
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#17
08-25-2008 | 09:43 AM
Registered User
Joined: May 2006
Posts: 1,261
From: Greenwich, CT
Rep Power: 75
I feel so far for the price that the EVOMS intercoolers are off the hook! Well made product fits exceptionally and I ran 3 back to back passes with out 1hp or 1lb of tq lost. Plus the pressure drop was very minimal and the curve was only shifted to the right less then 200 rpms.
S
S
#18
08-25-2008 | 09:46 AM
In Tom's original post he said "They don't fit and aren't ready for prime time yet"... I'd take that to mean he couldn't use them.
Mike
Mike
#20
08-25-2008 | 10:37 AM
Registered User
Joined: Nov 2007
Posts: 598
From: San Diego
Rep Power: 69
Why not EVOMS, if you are in Arizona?
Blown Six seem like good product but flakey company (according to others).
Switzer and Protomotive are top notch (I have Proto, obviously 4.5" thick cores),
but expensive. I am sure UMW will be great but the wait could put years on your life.
MK
Blown Six seem like good product but flakey company (according to others).
Switzer and Protomotive are top notch (I have Proto, obviously 4.5" thick cores),
but expensive. I am sure UMW will be great but the wait could put years on your life.
MK
#22
08-25-2008 | 10:44 AM
Registered User
Joined: Nov 2007
Posts: 598
From: San Diego
Rep Power: 69
Its the labor involved... the end tanks themselves are only $550 at most a pair. I ordered 3 different sets and finally came up with the 4.5" core thickness.
Intercoolers have one function, that's to cool the air coming
out of the turbo. There's a few things that can help/hinder the performance
of the intercooler. Ambient airflow through the cores to help cool the turbo'd air. For example, 20mph air gives 85% efficiency, where 10mph air gives only 50%, and that's what happens when the core gets too thick, especially in an area that doesn't have maximal airflow in the first place. The Porsche is using the negative pressure drop behind the rear tire to suck the air
through the core from the inlet behind the door. So, if the core is too
thick, it's very difficult to get air through it to assist the cooling of
the heated air.
Now, also imagine brick dimensions that's been heated to
200degF. Let it sit a while and imagine what would have happened. All
around the outside would have cooled down, but it would still be hot on the
inside... Vs. the thinner cores tending to have more surface area to
dissipate the heat and less internal volume. Ie. The 6x8x8 has
(2x(8x8))+(2x(6x8)) or 224 square inches of available surface area to
radiate heat from and only 64 square inches of area to get the cold air
through (remember we don't use the capped ends for this example) vs.the
4.5x9.4x12 core has (2x(9.4x12))+(2x(4.5x12)) or 333.6 square inches of
available surface area to radiate heat from and 112.8 sqare inches of area
to get the cold air through. Remember, the turbo can force it through, but
we're at the disposal of ambient air, heat rejection, surface area and flow
resistance to actually make the core work.
Basically, the 6x8x8 is a brick that will retain heat and work well
for a 1/4 car that can just do a quick run and be done with it, but then
you'd have to park the thing for an hour to let it cool down to do a run
again. The example I've given will cool down dramatically faster and be
more efficient steady state.
And all that and I didn't even get into the run through the core
lowering the temps so much more... Think of a 12in run vs. 8in. That means that the air is spending almost 50% more time in the core to cool down!
yayks... what did my self get into LOL anyways this is some of the stuff I and Todd K were discussing a few years back. I find it interesting so I decided to share it with all you guys...
markski
Intercoolers have one function, that's to cool the air coming
out of the turbo. There's a few things that can help/hinder the performance
of the intercooler. Ambient airflow through the cores to help cool the turbo'd air. For example, 20mph air gives 85% efficiency, where 10mph air gives only 50%, and that's what happens when the core gets too thick, especially in an area that doesn't have maximal airflow in the first place. The Porsche is using the negative pressure drop behind the rear tire to suck the air
through the core from the inlet behind the door. So, if the core is too
thick, it's very difficult to get air through it to assist the cooling of
the heated air.
Now, also imagine brick dimensions that's been heated to
200degF. Let it sit a while and imagine what would have happened. All
around the outside would have cooled down, but it would still be hot on the
inside... Vs. the thinner cores tending to have more surface area to
dissipate the heat and less internal volume. Ie. The 6x8x8 has
(2x(8x8))+(2x(6x8)) or 224 square inches of available surface area to
radiate heat from and only 64 square inches of area to get the cold air
through (remember we don't use the capped ends for this example) vs.the
4.5x9.4x12 core has (2x(9.4x12))+(2x(4.5x12)) or 333.6 square inches of
available surface area to radiate heat from and 112.8 sqare inches of area
to get the cold air through. Remember, the turbo can force it through, but
we're at the disposal of ambient air, heat rejection, surface area and flow
resistance to actually make the core work.
Basically, the 6x8x8 is a brick that will retain heat and work well
for a 1/4 car that can just do a quick run and be done with it, but then
you'd have to park the thing for an hour to let it cool down to do a run
again. The example I've given will cool down dramatically faster and be
more efficient steady state.
And all that and I didn't even get into the run through the core
lowering the temps so much more... Think of a 12in run vs. 8in. That means that the air is spending almost 50% more time in the core to cool down!
yayks... what did my self get into LOL anyways this is some of the stuff I and Todd K were discussing a few years back. I find it interesting so I decided to share it with all you guys...
markski
#23
08-25-2008 | 10:44 AM
Yup, I agree. That's a good read and education...
Mike
#24
08-25-2008 | 10:59 AM
Thread Starter
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Banned
Joined: Jul 2008
Posts: 1,144
From: Florida
Rep Power: 74
Its the labor involved... the end tanks themselves are only $550 at most a pair. I ordered 3 different sets and finally came up with the 4.5" core thickness.
Intercoolers have one function, that's to cool the air coming
out of the turbo. There's a few things that can help/hinder the performance
of the intercooler. Ambient airflow through the cores to help cool the turbo'd air. For example, 20mph air gives 85% efficiency, where 10mph air gives only 50%, and that's what happens when the core gets too thick, especially in an area that doesn't have maximal airflow in the first place. The Porsche is using the negative pressure drop behind the rear tire to suck the air
through the core from the inlet behind the door. So, if the core is too
thick, it's very difficult to get air through it to assist the cooling of
the heated air.
Now, also imagine brick dimensions that's been heated to
200degF. Let it sit a while and imagine what would have happened. All
around the outside would have cooled down, but it would still be hot on the
inside... Vs. the thinner cores tending to have more surface area to
dissipate the heat and less internal volume. Ie. The 6x8x8 has
(2x(8x8))+(2x(6x8)) or 224 square inches of available surface area to
radiate heat from and only 64 square inches of area to get the cold air
through (remember we don't use the capped ends for this example) vs.the
4.5x9.4x12 core has (2x(9.4x12))+(2x(4.5x12)) or 333.6 square inches of
available surface area to radiate heat from and 112.8 sqare inches of area
to get the cold air through. Remember, the turbo can force it through, but
we're at the disposal of ambient air, heat rejection, surface area and flow
resistance to actually make the core work.
Basically, the 6x8x8 is a brick that will retain heat and work well
for a 1/4 car that can just do a quick run and be done with it, but then
you'd have to park the thing for an hour to let it cool down to do a run
again. The example I've given will cool down dramatically faster and be
more efficient steady state.
And all that and I didn't even get into the run through the core
lowering the temps so much more... Think of a 12in run vs. 8in. That means that the air is spending almost 50% more time in the core to cool down!
yayks... what did my self get into LOL anyways this is some of the stuff I and Todd K were discussing a few years back. I find it interesting so I decided to share it with all you guys...
markski
Intercoolers have one function, that's to cool the air coming
out of the turbo. There's a few things that can help/hinder the performance
of the intercooler. Ambient airflow through the cores to help cool the turbo'd air. For example, 20mph air gives 85% efficiency, where 10mph air gives only 50%, and that's what happens when the core gets too thick, especially in an area that doesn't have maximal airflow in the first place. The Porsche is using the negative pressure drop behind the rear tire to suck the air
through the core from the inlet behind the door. So, if the core is too
thick, it's very difficult to get air through it to assist the cooling of
the heated air.
Now, also imagine brick dimensions that's been heated to
200degF. Let it sit a while and imagine what would have happened. All
around the outside would have cooled down, but it would still be hot on the
inside... Vs. the thinner cores tending to have more surface area to
dissipate the heat and less internal volume. Ie. The 6x8x8 has
(2x(8x8))+(2x(6x8)) or 224 square inches of available surface area to
radiate heat from and only 64 square inches of area to get the cold air
through (remember we don't use the capped ends for this example) vs.the
4.5x9.4x12 core has (2x(9.4x12))+(2x(4.5x12)) or 333.6 square inches of
available surface area to radiate heat from and 112.8 sqare inches of area
to get the cold air through. Remember, the turbo can force it through, but
we're at the disposal of ambient air, heat rejection, surface area and flow
resistance to actually make the core work.
Basically, the 6x8x8 is a brick that will retain heat and work well
for a 1/4 car that can just do a quick run and be done with it, but then
you'd have to park the thing for an hour to let it cool down to do a run
again. The example I've given will cool down dramatically faster and be
more efficient steady state.
And all that and I didn't even get into the run through the core
lowering the temps so much more... Think of a 12in run vs. 8in. That means that the air is spending almost 50% more time in the core to cool down!
yayks... what did my self get into LOL anyways this is some of the stuff I and Todd K were discussing a few years back. I find it interesting so I decided to share it with all you guys...
markski
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