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Author
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Topic: runner lengths for short-runner intake?
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Elapid
GOROBGO
Member # 50
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posted
 
 
i don't drive my car alot, so i might as well try out modifying an intake. my question is this: in short-runner intakes for dohc cobra motors, do they flowtest each runner to match actual flow, or just chop the runners to a single length?
my thought is that first you would cut the runners to length, reassemble the intake and flowtest each one, shortening any low-flowing runners and thereby equalizing the intake charge in each cylinder.
it seems that would maximize power, but is it being done/worth trying?
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98 Cobra
83 Notch rolling chassis - fs
Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000
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Elapid
GOROBGO
Member # 50
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posted
yep, that's where i was reading about it last year...
i'm finally to a point where i think it would make a difference.
i dont' recall him flowtesting each runner but i'll go reread the article since it has been so long.
thanks for the link!
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98 Cobra
83 Notch rolling chassis - fs
Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000
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Elapid
GOROBGO
Member # 50
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posted
i just re-read the runner length part...
i think he's missing something. since they lost flow, i believe there are waves in the flow and they need to cut the runners such that they are at a peak, not a valley. theoretical physics bs...
either that, or the bell at the end of the runner makes more of a difference than they suspect.
i also believe that by not flowtesting them in the assembled intake (if that's possible) they are missing some important data. since #8 cyl runs lean usually as evidenced by many blown up motors with #8 gone...by adjusting for equal flow, each cylinder would make maximum power because of optimized mixture.
[ September 11, 2003, 03:53 PM: Message edited by: Elapid ]
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98 Cobra
83 Notch rolling chassis - fs
Posts: 1797 | From: Grass Valley, CA USA | Registered: Jul 2000
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-NORCALCOBRA-
¯
Member # 2383
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posted
i am gonna shorten the runners on mine also if you do yours post some pics of the process i have access to a flow bench i will post flow numbers when i finish
[ September 12, 2003, 10:50 AM: Message edited by: -NORCALCOBRA- ]
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H.C.I 285 ci. ported 2003 heads heads, Sullivan Intake, stage 3 cams..T-76 single turbo to come...
R.M.I cylinder head fabrication
408 986 8626
Posts: 516 | From: SAN JOSE | Registered: Jan 2003
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