few questions about degas bottle - Ford Powerstroke Diesel Forum
 
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post #1 of 8 Old 06-28-2014, 10:42 PM Thread Starter
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few questions about degas bottle

Ok guys gotta a few questions about the degas bottle on my 6.0

1. Is it ok to let pressure off of the system when hot?
2. Why does my 6.0 and my friend's 6.0 have more pressure on the cap when the trucks are tuned vs when they are on stock tuning?,

Mines an 03 his is an 04. Both stock bolts, I have a sct Livewire with custom Looney tune, he has a superchips flashpaq.

Thanks guys
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post #2 of 8 Old 06-29-2014, 07:38 AM
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Quote:
Originally Posted by HardcoreFx4 View Post
Ok guys gotta a few questions about the degas bottle on my 6.0

1. Is it ok to let pressure off of the system when hot?
2. Why does my 6.0 and my friend's 6.0 have more pressure on the cap when the trucks are tuned vs when they are on stock tuning?,

Mines an 03 his is an 04. Both stock bolts, I have a sct Livewire with custom Looney tune, he has a superchips flashpaq.

Thanks guys
1). Yes, but be careful not to get burned.

2). Tuned motors produce more heat, have more boost, and have increased cylinder pressures. Increased heat equals higher pressure in a sealed system (of course until the cap vents). Increased boost and cylinder pressure is what your head gaskets are trying to contain and keep out of the cooling system. When my head gaskets let go (under a high load, high boost situation) I would get up to 22 psi in my cooking system. Cooling system pressure did not match boost pressure, but they moved upward together. After studs, o-ringed heads, full Bulletproofing, I now monitor cooling system psi. Normally is 8 to 9 psi, far below the 16 psi vent pressure of the cap.

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post #3 of 8 Old 06-29-2014, 08:11 AM Thread Starter
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Originally Posted by skanj0 View Post
1). Yes, but be careful not to get burned.

2). Tuned motors produce more heat, have more boost, and have increased cylinder pressures. Increased heat equals higher pressure in a sealed system (of course until the cap vents). Increased boost and cylinder pressure is what your head gaskets are trying to contain and keep out of the cooling system. When my head gaskets let go (under a high load, high boost situation) I would get up to 22 psi in my cooking system. Cooling system pressure did not match boost pressure, but they moved upward together. After studs, o-ringed heads, full Bulletproofing, I now monitor cooling system psi. Normally is 8 to 9 psi, far below the 16 psi vent pressure of the cap.
Ok so what your saying is it's normal to have more pressure, someone said since I have a custom tune, the writer makes it not have as high of cylinder pressure. Is that true?
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post #4 of 8 Old 06-29-2014, 08:20 AM
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Originally Posted by HardcoreFx4 View Post
, someone said since I have a custom tune, the writer makes it not have as high of cylinder pressure. Is that true?


the writer wouldn't be very popular if He did that
he would have to limit boost and fuel like an Eco tune

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post #5 of 8 Old 06-29-2014, 08:21 AM Thread Starter
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Originally Posted by ZMANN View Post
the writer wouldn't be very popular if He did that
he would have to limit boost and fuel like an Eco tune
Well they said they are safe for stock bolts.
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post #6 of 8 Old 06-29-2014, 08:23 AM
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it may be?
but you said
Quote:
someone said since I have a custom tune, the writer makes it not have as high of cylinder pressure. Is that true?
so if it was less than stock it would be under performing the stock tune

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post #7 of 8 Old 06-29-2014, 08:25 AM Thread Starter
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Originally Posted by ZMANN View Post
it may be?
but you said

so if it was less than stock it would be under performing the stock tune
Yeah that makes since. Thanks.
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post #8 of 8 Old 06-29-2014, 08:32 AM Thread Starter
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If I keep the cap loose on my truck will it leave a lot of the pressure off the system?
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