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Old 06-19-2006, 11:37 PM   #1
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Default Curious about anything L36 UM or LIM?

I just got the manifolds off ebay to measure and play around with.
Didn't really mess with them much today but I did find something kind of interesting..
I was curious to see how much, if at all, the runners tapor in the LIM. So, I measured the cross sectional area of both. I used the entrance of the runner in the LIM for the first point and a LIM to head gasket for the second. The ports to the head are actually smaller and no two ports are the same so I measured the gasket since the LIM will be gasket matched anyway.
Now I don't have calipers and I'm approximating curved corners to be 2/3 the area of a square.
I found that there is approximately a 29% decrease in cross sectional area. This is even greater if the ports are not gasket matched. (but then theres turbulance since the head port is larger)
I was curious to see if taporing of the port was used to speed up velocity in the port. It'* hard to tell since the entrance and exit to the LIM are drastically different in shape. But anyway the port is tapored.
Numbers I got are:
1736 mm^2 for the inlet
1238 mm^2 for the exit
I'm planning on finding out the:
volume of the UIM w/out runners installed
volume of the UIM minus the area occupied by the runners
volume of the LIM open to the plenum
volume of the TB neck
Gotta get some clay though..
Anyone any any measurements or curious to know what coolant port flows where?
I'll be messing around with these for a while
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Old 06-19-2006, 11:41 PM   #2
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From my work on the S1 L67 end, if you open things up without the flow to support it (forced induction of some type) you'll lose low end and gain high end.

What are you after?
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Old 06-19-2006, 11:50 PM   #3
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Quote:
Originally Posted by willwren
What are you after?
Right now I'm just trying to see how much of a difference in volume and geometry the HVII made.
But later on I'd like to try something performance wise with these OEM pieces. Plenty of ideas but not quite sure what I want to do. It just helps to have this stuff on hand though.
More than likey I'll try and give resonance tuning a shot.. Still have plenty of research to do before I'll be confident enough to try somethign though.. But thats for another post a while from now..
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Old 06-20-2006, 12:26 AM   #4
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Keep it up Mike. I learned what I learned by having the pieces to play with.
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