Upper Intake Replacement Photos - 56k WARNING
03-05-2004, 06:01 PM
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Upper Intake Replacement Photos - 56k WARNING
Here are a few pictures from the first part of my project today. A few days ago, I noticed that I was low on coolant, so I decided to replace the OEM manifold with an Dorman aftermarket unit before the problem gets any worse.
My first sign of troubles.
Coolant leaking around the base of the upper manifold and EGR pipe.
A throttle in need of cleaning.
The lower manifold covered in oil and coolant.
If you look closely at the coolant passage on the right, there is a hole between it and the EGR pipe.
A comparison between the OEM manifold on the left and the Dorman manifold on the left. Notice how the ports are more reinforced around the EGR pipe on the aftermarket unit.
My first sign of troubles.
Coolant leaking around the base of the upper manifold and EGR pipe.
A throttle in need of cleaning.
The lower manifold covered in oil and coolant.
If you look closely at the coolant passage on the right, there is a hole between it and the EGR pipe.
A comparison between the OEM manifold on the left and the Dorman manifold on the left. Notice how the ports are more reinforced around the EGR pipe on the aftermarket unit.
03-07-2004, 11:03 PM
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how hard would it be to make an upper intake out of metal? i mean why hasnt a company taken up this idea? i know theyd have like 50 buyers just from here at least. i mean would it just be insanely difficult to mold? im sure this has been discussed b4 but im bringing it up again.
03-07-2004, 11:20 PM
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Originally Posted by LittleHoov
how hard would it be to make an upper intake out of metal? i mean why hasnt a company taken up this idea? i know theyd have like 50 buyers just from here at least. i mean would it just be insanely difficult to mold? im sure this has been discussed b4 but im bringing it up again.
03-08-2004, 12:30 AM
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I don't understand why they bother to run coolant up into that intake in the first place. It looks like all it does is flow into a little passage in the throttle body to warm it. On my LS1 there are some small pipes that run coolant through the TB, but it'* a popular mod to use a pipe to bypass the TB. The thought is that the coolant just ends up making the TB hot and increased the intake air temp which reduces power slightly.
03-08-2004, 01:13 AM
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The intake runs through the plastic intake to prevent temperature 'shock'. The idea is to control the temp (keep it hot) to prevent it from going hot/cold/hot/cold.
This is more stable. It warms up gradually, stays at that temp, and cools down gradually. There isn't an enrmous heat differential between the lower (hot) and upper (plastic) intake this way.
Moving this to 92-99, for it'* mechanical content.
This is more stable. It warms up gradually, stays at that temp, and cools down gradually. There isn't an enrmous heat differential between the lower (hot) and upper (plastic) intake this way.
Moving this to 92-99, for it'* mechanical content.
