NA Motor Discussions regarding N/A KA24E, KA24DE, and SR20DE

KA Head Flow Rates

Old 01-16-2008, 12:37 AM
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KA Head Flow Rates

Half Cut



Bench Flow Test

Valve Lift / CFM

Intake:
.100" = 99.3
.200" = 171.1
.300" = 223.4
.400" = 241.8
.500" = 243.6

Exhaust:
.100" = 75.8
.200" = 144.5
.300" = 173.9
.400" = 182.9
.500" = 183.6
Originally Posted by Valve Info
Intake -
Valve Diameter: 36.6mm
Valve Stem Diameter: 6.97mm
Valve Length: 101.32mm

Exhaust -
Valve Diameter: 31.3mm
Valve Stem Diameter: 6.94mm
Valve Length: 99mm
Head Volume (cc's) = 46cc's


Last edited by 240-kid; 01-28-2008 at 10:13 PM.
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Old 01-16-2008, 06:16 PM
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I'm assuming the flow bench test on the bottom is stock flow rate... Is this correct?
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Old 01-17-2008, 12:21 AM
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Yeah, the top one had a Flow Bench error, so I need to remove it


Edited***

Last edited by 240-kid; 01-17-2008 at 12:31 AM.
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Old 01-17-2008, 07:17 AM
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Stickied!
I need this info for some before and after flow bench results on the head work I am about to do.
You can tell that flow can be a little better with the KA head at 99.3 CFM/ per .100" of lift it should have a CFM closer to 98~100CFM. Exhaust seems to be small diameter sizes for smog and scavaging reasons.
I would bet that very little head work needs to be done to the KA and it would have to do more with the valve diameter. I bet just a .040 diameter increase on intake and exhaust would make those CFM numbers go way up!
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Old 01-23-2008, 04:21 PM
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Would it be smart to do a minor port and polish job and over size Int. valves .5mm over and exhaust .7mm over? or would that just not make sense, I figured this since the exhaust size doesn't flow so well.

Seems like 10mm of lift is optimal
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Old 01-23-2008, 06:02 PM
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Originally Posted by 240-kid View Post
Would it be smart to do a minor port and polish job and over size Int. valves .5mm over and exhaust .7mm over? or would that just not make sense, I figured this since the exhaust size doesn't flow so well.

Seems like 10mm of lift is optimal
Just minor port, extrude, and polish you don't want to ruin the overall velocity of the runners. I think that improving the valve diameters would be much more critical.
I don't see why you wouldn't just do a .5mm all around, and enlarge the runners on the exhaust a tad more.
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Last edited by BigVinnie; 02-04-2008 at 05:18 AM.
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Old 01-23-2008, 09:40 PM
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OK makes sense

added some more head info
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