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destineal
Joined: 08 Sep 2007
Posts: 86
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| Posted: Tue Oct 09, 2007 10:46 pm Post subject: Upper Intake Manifold |
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| Everytime i look up info on upper intake manifold failures and replacement on 3800 motors its the 95-04 models. I drive a 1994 olds 98 with a Series I 3800 so am i not prone to UIM failure? |
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91parkave
Joined: 29 May 2007
Posts: 525
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| Posted: Tue Oct 09, 2007 11:01 pm Post subject: Re: Upper Intake Manifold |
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| yes you are, Not as bad as the series 2 design, But IMO should be done every 80,000 miles,otherwise the TB gasket is the weak link in the factory designs as it deteroiates letting coolant in the airstream and eventually hydrolocking your motor............. autozone and NAPA both have them for around 70bucks There are also ways to keep your manifold lasting longer like pluging your coolant holes etc... |
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myfathersoldsmobile
Joined: 15 Sep 2007
Posts: 41
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| Posted: Thu Oct 11, 2007 5:37 pm Post subject: Re: Upper Intake Manifold |
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91parkave wrote: yes you are, Not as bad as the series 2 design, But IMO should be done every 80,000 miles,otherwise the TB gasket is the weak link in the factory designs as it deteroiates letting coolant in the airstream and eventually hydrolocking your motor............. autozone and NAPA both have them for around 70bucks There are also ways to keep your manifold lasting longer like pluging your coolant holes etc...
x2 I think I have the series 2, and I personally despise that design. It's hard to imagine such a tiny mating surface to be an effective seal over time. Furthermore the use of plastic in the assembly makes it subject to easy warpage. Does anyone offer a better aftermarket option? |
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destineal
Joined: 08 Sep 2007
Posts: 86
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| Posted: Thu Oct 11, 2007 5:48 pm Post subject: Re: Upper Intake Manifold |
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| Does anyone make them in metal? |
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91parkave
Joined: 29 May 2007
Posts: 525
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| Posted: Fri Oct 12, 2007 8:30 am Post subject: Re: Upper Intake Manifold |
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The 91' 3800's are aluminum but the composite is plenty durable unless you turbo youre car with 18psi then you'd have to worry about it being an issue.
The only reason the ocmposite has an issue is because of where the EGR is located...otherwise it flows better and is more thermaly efficent than the aluminum design for the first year of the 3800 |
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destineal
Joined: 08 Sep 2007
Posts: 86
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| Posted: Fri Oct 12, 2007 4:43 pm Post subject: Re: Upper Intake Manifold |
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| How much psi can the stock motor take? I thought anything over 5 psi would leave you spinning out in 1st and 2nd gear |
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91parkave
Joined: 29 May 2007
Posts: 525
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| Posted: Sat Oct 13, 2007 8:54 am Post subject: Re: Upper Intake Manifold |
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| a stock motor in good shap can take around 12psi but anything beyond that i wouldnt do without upgrading |
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Vee6Fan
Joined: 05 Nov 2007
Posts: 5
Location: Omaha, NE
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| Posted: Mon Nov 05, 2007 8:56 pm Post subject: Re: Upper Intake Manifold |
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| so if i were to upgrade to the plastic upper intake manifold, i could plug the coolant holes in the lower? |
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88 Coupe
Joined: 15 Feb 2004
Posts: 2985
Location: Southern California
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| Posted: Wed Nov 07, 2007 4:42 am Post subject: Re: Upper Intake Manifold |
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Hi Vee6Fan,
Welcome to TOC.
Quote: ........ plug the coolant holes in the lower?
Not a good idea.
Norm |
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Vee6Fan
Joined: 05 Nov 2007
Posts: 5
Location: Omaha, NE
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| Posted: Fri Nov 09, 2007 8:00 pm Post subject: Re: Upper Intake Manifold |
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| any suggestions on plugging the egr port on the plastic plenum? i was astounded to find that i dont have egr. also, please forgive my naivity as this is my first 3800 powered vehicle. |
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88 Coupe
Joined: 15 Feb 2004
Posts: 2985
Location: Southern California
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| Posted: Mon Nov 12, 2007 12:15 am Post subject: Re: Upper Intake Manifold |
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Vee6Fan wrote: ........ i dont have egr ........
If I were you, I would be wondering why not.
Norm |
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Vee6Fan
Joined: 05 Nov 2007
Posts: 5
Location: Omaha, NE
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| Posted: Mon Nov 12, 2007 12:35 pm Post subject: Re: Upper Intake Manifold |
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| I dont know why I dont have egr. Probably for the same reason that ecotec's dont, except in california. |
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Vee6Fan
Joined: 05 Nov 2007
Posts: 5
Location: Omaha, NE
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| Posted: Wed Nov 14, 2007 6:48 pm Post subject: Re: Upper Intake Manifold |
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| well, i got a freeze plug that is the samd size as the hole for the egr, put it in, and secured it with some epoxy. |
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91parkave
Joined: 29 May 2007
Posts: 525
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| Posted: Wed Nov 21, 2007 4:10 am Post subject: Re: Upper Intake Manifold |
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| for norm- Series 1's 91- pre 92 are not equiped with a EGR 93-94's are equiped with a EGR- as forwhy The aluminum upper intake series one dont have a EGR and the Composite ABS upper intake plenums are equipped with EGR is more GM dumbass R&D |
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88 Coupe
Joined: 15 Feb 2004
Posts: 2985
Location: Southern California
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| Posted: Fri Nov 23, 2007 9:08 am Post subject: Re: Upper Intake Manifold |
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91buickman wrote: for norm- ........
What is your point?
Norm |
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