dorman intake - Page 2 - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


1992-1999 Series I L27 (1992-1994 SE,SLE, SSE) & Series II L36 (1995-1999 SE, SSE, SLE) and common problems for the Series I and II L67 (all supercharged models 92-99) Including Olds 88's, Olds LSS's and Buick Lesabres Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 03-14-2007, 11:41 AM   #11
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Look at the pic of his that I posted above. He'* already sleeved. I'm not sure what the issue is here, or I'm just missing it.
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Old 03-14-2007, 11:50 AM   #12
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willwren, I understood that he wanted to show us the improvement he made by sleeving his new upper, in addition to questioning the shape of the runner insert.
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Old 03-14-2007, 12:01 PM   #13
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I thought the Dorman intakes were already sleeved? Communication seems to be very lacking in this topic. Firebuick, you need to be alot more clear about what you're trying to point out or ask.

:mass confusion:
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Old 03-14-2007, 12:02 PM   #14
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ive posted the picts because agrazela ask for them and to show the difference from the inside of a dorman and a oem upper
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Old 03-14-2007, 12:05 PM   #15
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no the dorman intake is not sleeve and sorry for the confusion im a french canadien and english is me second language
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Old 03-14-2007, 12:40 PM   #16
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firebuick,

That sleeving you did looks OK to me...but please get Bill Buttermore'* opinion, as he'* the man on EGR sleeve issues.

From the looks of your UIM runners, it looks like you could do something very much like what I'm doing, but I'm going to agree with willwren and say please don't do it until I've completed my experiment.

(But if you MUST experiment, make sure to get a spare UIM...and have a backup car you can drive )
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Old 03-14-2007, 12:49 PM   #17
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Quote:
Originally Posted by willwren
I thought the Dorman intakes were already sleeved? Communication seems to be very lacking in this topic. Firebuick, you need to be alot more clear about what you're trying to point out or ask.

:mass confusion:
No, Dorman uppers are not sleeved. That is why I recommend APN. That is also why I designed the shielded stovepipes. They can be used with a new Dorman upper to give almost as good a result as the APN by just installing them into the LIM. I think that Dorman figures the big gap they provide with their .510" stovepipes (about .135") is good enough. But without a sleeve, they are not as good as APN.

Summary: APN: metal sleeved UIM, 1) reduced diameter stovepipe with 3/4" base
.....................Dorman: no sleeve UIM, 2) reduced diameter stovepipes 3/4" and 5/8" bases
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Old 03-14-2007, 12:50 PM   #18
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The pics Firebuick posted CLEARLY show a sleeve! Is that his Dorman intake or not?
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Old 03-14-2007, 12:52 PM   #19
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yes its a dorman intake that i made a sleeve myself because some say that they fail also
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Old 03-14-2007, 01:04 PM   #20
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I have tried to point out the differences in repair options for L36 UIMs, but somehow the information doesn't seem to get across. I think folks see the numbers for gap dimensions and such, and just skip over it, not wanting to get bogged down in the details. But, as they say: " the devil is in the details." I am certain that I have repeatedly pointed out the benefits of the APN factory sleeved upper over Dorman'* unprotected plastic, so I can't say where the failure in communication is.

Although we need to do another update to add information on Dorman'* new pipe for 95-98 LIMs, the current Techinfo article provides the correct information:

Quote:
Originally Posted by Techinfo Article 38
The Dorman upper is a good replacement for the original equipment part, and includes a UIM gasket, but the EGR passage is not protected with a sleeve.
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