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Old 07-27-2005, 01:48 PM   #11
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a little out-loud math:

in two rotations, we displace 3.8 liters of air.
in one rotation, we displace 1.9 liters of air.

at 6500 RPM, we'd pull in 12350 liters per minute. that'* 436.1361 cubic feet per minute (CFM).

do you know the velocity of the air moving through your motor?
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Old 07-27-2005, 02:13 PM   #12
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more out loud math:

your maf has a max reading of 190 grams/sec (it may or may not read above that properly, from what I'm reading).

now, if your motor was breathing well enough that it was 100% efficient (yeah right, but we'll assume it anyway), check my math:

IAT of 86F (30 C), density of air is 1.164 kg/m^3 = 1.164 g/liter
1.164 g/liter * 12350 liter/min * 1/60 min/sec = 337.5667 g/sec

So, if my numbers here are right, with a perfectly flowing setup, at 6500 RPM, you could outflow your MAF.

<edit> the l67 maf can do up to 320 g/sec
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Old 07-27-2005, 11:31 PM   #13
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Quote:
Originally Posted by mkaake
more out loud math:

your maf has a max reading of 190 grams/sec (it may or may not read above that properly, from what I'm reading).

now, if your motor was breathing well enough that it was 100% efficient (yeah right, but we'll assume it anyway), check my math:

IAT of 86F (30 C), density of air is 1.164 kg/m^3 = 1.164 g/liter
1.164 g/liter * 12350 liter/min * 1/60 min/sec = 337.5667 g/sec

So, if my numbers here are right, with a perfectly flowing setup, at 6500 RPM, you could outflow your MAF.

<edit> the l67 maf can do up to 320 g/sec
except nobody is shifting a L36 at 6500 RPM as far as I know.
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Old 07-28-2005, 09:30 AM   #14
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figured I'd throw it out just in case he wanted to go that far... better to have the wiggle room available...
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Old 07-28-2005, 10:52 AM   #15
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Pretty interesting math mkaake.
Quote:
Originally Posted by macho_mike21
except nobody is shifting a L36 at 6500 RPM as far as I know.
I'm shifting at 64xx and there are definitely people at cgp that are shifting at 6500+
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Old 07-28-2005, 10:57 AM   #16
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thanks... I was going to take it a step further, and calculate the max/min size for the intake to maintain laminar flow, but since I don't know our actual flow numbers from the maf, it ended right about there... I imagine a 3" could handle quite a bit. Maybe I'll use the 3" as a baseline, and see how much we can flow before we're turbulent...

NO! I need to WORK!!!


darned bc club!



I try to maintain a good balance of work vs club while I'm here doesn't always work out as planned.
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Old 07-29-2005, 01:34 AM   #17
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Quote:
Originally Posted by mkaake
I try to maintain a good balance of work vs club while I'm here doesn't always work out as planned.
20% work, 80% bc is a good number.
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Old 07-29-2005, 08:23 AM   #18
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while I agree, I'm not sure GM agrees
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