My L36 modded intake runners - GM Forum - Buick, Cadillac, Chev, Olds, GMC & Pontiac chat


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Old 02-18-2008, 01:39 AM   #1
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Default My L36 modded intake runners

I finally got my pictures transfered from my phone so I posted a picture of my modded UIM runners on my L36. Now, I tested them back and forth between stock runners (Doorman intake) and my modded ones. The "seat of the pants feel" says the modded ones pull harder in the mid and higher RPM range with no lose to low end. And the best part is the cost.............free. About an hour of your time. The runner at the bottom is a stock Doorman piece and the one on top if my modded Doorman piece. You can see where I cut holes in to allow more flow but not disturbing the shape of the runners. I also did some trimming on the ends.
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Old 02-18-2008, 02:13 AM   #2
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You.... are awesome... I've been wanting someone to do a writeup on this for a LONG time! Allow me to be your second subject
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Old 02-18-2008, 02:17 AM   #3
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do me do me
this is really interesting, i have always wondered abotu the upper intake... the lower can be ported, but i didnt though you could do much with plastic. guess i was wrong!
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Old 02-18-2008, 02:28 AM   #4
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I have about 3000 miles on this setup as of now and the motor runs really strong with no hesitations or problems. My current setup will stay right with most mild older SSEI'*. I recently pulled the plugs and they are a nice tan color. I dont see and issues with doing this. And there was no loss of power that I could feel. If you dont believe my, check out the videos I posted of my tranny build in the pics/ video section.
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Old 02-18-2008, 11:07 AM   #5
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This has been tried before. The question is do the 5 And 6 get more flow because of how close they are to the direct path of the TB? The only way to know is to inspect your plugs or install 6 wideband O2'*. The O2 idea isn't very practical.

I'm working on an L36 project along the same lines, and would very much appreciate a very good close pic of all six plugs laid out in order.
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Old 02-18-2008, 12:12 PM   #6
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Runners at the opening shouldn't receive any more flow thant he rest of the intake. When you go WOT, the intake still see'* 0-1" of vacuum. Balancing of flow should not be an issue.
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Old 02-18-2008, 12:21 PM   #7
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The shape of the exit of the L36 TB is a potential issue. It'* wider opening is directly on-axis with his cutouts.

On the OEM runners, the runner inlets are significantly higher in the manifold than the wide axis of the TB.

I'd still like to see his plugs. I need a solid answer on this before moving forward on my next project.
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Old 02-18-2008, 01:18 PM   #8
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Draw should be the same across the board, since all the runners in question are behind the "choke point". Each cylinder will draw the same amount of air. Of course, that'* just the way I see it.
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Old 02-18-2008, 05:21 PM   #9
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If you get a radius on that opening somehow, you'll gain even more.

Maybe some epoxy or resin with something the size of a bic pen housing..
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Old 02-18-2008, 05:25 PM   #10
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If the 5 and the 6 get more airflow due to the location like you said, why not restrict the opening a bit more only on those runners?
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