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Old 01 Nov 2006, 01:43 pm
bug67ph@gmail.com
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Default Throttle Body Coolant Bypass?

I live in a hot climate, where it never snows, it's always humid and
the coldest it gets is around 84 degrees Fahrenheit (93 in the shade in
summer!).

Even if a throttle body coolant bypass doesn't gain any HP (and I hear
from Mista Bone it doesn't), wouldn't it be "kinder" to the cooling
system to not have to go through the throttle body/EACV?

Or is this totally wrong?

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Old 01 Nov 2006, 05:27 pm
Eric
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Default Re: Throttle Body Coolant Bypass?

bug67ph@gmail.com wrote:
>
> I live in a hot climate, where it never snows, it's always humid and
> the coldest it gets is around 84 degrees Fahrenheit (93 in the shade in
> summer!).
>
> Even if a throttle body coolant bypass doesn't gain any HP (and I hear
> from Mista Bone it doesn't), wouldn't it be "kinder" to the cooling
> system to not have to go through the throttle body/EACV?
>
> Or is this totally wrong?


Bypassing the EACV will likely cause the engine to not run correctly either
during warm up, or more probable, after warm up.

Eric
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Old 01 Nov 2006, 06:05 pm
TeGGeR®
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Default Re: Throttle Body Coolant Bypass?

bug67ph@gmail.com wrote in
news:1162410230.151558.12850@k70g2000cwa.googlegro ups.com:

> I live in a hot climate, where it never snows, it's always humid and
> the coldest it gets is around 84 degrees Fahrenheit (93 in the shade
> in summer!).
>
> Even if a throttle body coolant bypass doesn't gain any HP (and I hear
> from Mista Bone it doesn't), wouldn't it be "kinder" to the cooling
> system to not have to go through the throttle body/EACV?
>
> Or is this totally wrong?
>




It's not entirely right.

The bypass is a tiny amount of fluid. A VERY tiny amount. The purpose of
it is to ensure the throttle body, idle air control valve, idle screw
aperture and other items don't ice up in operation. Icing can happen at
temperatures *well* above freezing due to the "venturi effect" (Google
for it).

Any additional load the bypass imposes on the engine or cooling system
is so small as to be essentially immeasurable. In addition, some
emissions controls require that intake air be at least 176F, which is
not achievable unless coolant is passing though the throttle body.

Leave it alone.


--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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Old 01 Nov 2006, 11:04 pm
bug67ph@gmail.com
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Default Re: Throttle Body Coolant Bypass?


Thanks. I was really not planning on doing it.

However, I saw that on newer models with roughly the same engine (same
engine block, but with VTEC), Honda has done this exact bypass! But I
would think that they had reprogrammed ECU to handle this, right? If I
did it without the ECU's "consent" so to speak, fuel consumption would
go up, right?

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  #5 (permalink)  
Old 02 Nov 2006, 06:05 am
TeGGeR®
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Default Re: Throttle Body Coolant Bypass?

bug67ph@gmail.com wrote in news:1162443893.158896.214150
@e3g2000cwe.googlegroups.com:

>
> Thanks. I was really not planning on doing it.
>
> However, I saw that on newer models with roughly the same engine (same
> engine block, but with VTEC), Honda has done this exact bypass! But I
> would think that they had reprogrammed ECU to handle this, right? If I
> did it without the ECU's "consent" so to speak, fuel consumption would
> go up, right?
>
>



Probably.

Some models carry their coonlant internally instead of through an external
hose, so you wouldn't see the bypass route.

--
TeGGeR®

The Unofficial Honda/Acura FAQ
www.tegger.com/hondafaq/
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