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maximum flow of NA rx-8

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Old 12-06-2007, 08:21 PM
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maximum flow of NA rx-8
ok, for the sake of the argument, lets say with an NA rx8, everything functioning optimally (rarely the case in real life)

what is the maximum diameter of the throttle body, manifold and air intake to achieve the most whp?

same goes for exhaust.

what is the stats for our exhaust port? which I think RG or someone said is the real restrictor?
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Old 12-06-2007, 10:18 PM
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Doesn't matter until the engine flows more, the exhaust ports are restrictive but there isn't a whole lot that can be done.
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Old 12-06-2007, 10:32 PM
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At standard temperature and pressure (and assuming a 90% Ve at 9200 RPM), a naturally aspirated Renesis will move 28 pounds of air a minute at 383 CFM.
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Old 12-06-2007, 10:42 PM
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Technically the MAXIMUM would be ~420cfm/~32lbs/min but thats 100%VE 9200RPM. The number MM posted with 90%VE is closer to the truth.
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Old 12-06-2007, 10:47 PM
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ok, thankyou for the info, just wanted to know some figs
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Old 12-06-2007, 10:50 PM
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Be honest, Taj, you have no idea how to digest the numbers you just saw
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Old 12-06-2007, 10:52 PM
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Originally Posted by mac11
Technically the MAXIMUM would be ~420cfm/~32lbs/min but thats 100%VE 9200RPM. The number MM posted with 90%VE is closer to the truth.
Well, yeah.

Actual airflow measurements say its 90% Ve at that RPM.
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Old 12-06-2007, 10:54 PM
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Originally Posted by MazdaManiac
Well, DUH.

Actual airflow measurements say its 90% Ve at that RPM.
fixed...
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Old 12-06-2007, 10:59 PM
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Originally Posted by MazdaManiac
Well, yeah.

Actual airflow measurements say its 90% Ve at that RPM.
I was pretty sure I was agreeing with you
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Old 12-06-2007, 11:00 PM
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Originally Posted by mac11
I was pretty sure I was agreeing with you
Yes. Yes you were. Sorta.

Originally Posted by chickenwafer
Be honest, Taj, you have no idea how to digest the numbers you just saw
I'm pretty sure he doesn't even understand the question.
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Old 12-06-2007, 11:10 PM
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what was the question? what is the answer? I have no clue, who posted the damn question?
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Old 12-07-2007, 11:30 AM
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Originally Posted by mac11
Technically the MAXIMUM would be ~420cfm/~32lbs/min but thats 100%VE 9200RPM. The number MM posted with 90%VE is closer to the truth.

well there are rpms when the flow is actually above 100% ve.
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Old 12-07-2007, 11:37 AM
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https://www.rx8club.com/showthread.p...highlight=flow

is where the pertinent info can be found



following that graph you can work out that at 9200 rpm the VE is actually 87% or what jeff posted in his rotary math thread
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Old 12-07-2007, 11:41 AM
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Originally Posted by zoom44
well there are rpms when the flow is actually above 100% ve.
Right, but its not at a high enough RPM to be flowing more than 32lbs/min.
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Old 12-07-2007, 11:45 AM
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Taj; why do you even want to know?
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Old 12-07-2007, 11:57 AM
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Originally Posted by mac11
Right, but its not at a high enough RPM to be flowing more than 32lbs/min.
sure its about 26.5 ilbs/min at 7k. but i thought it would be good to bring it up anyway- at the least it will confuse taj which should prove humorous and at most he might learn something
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Old 12-07-2007, 12:03 PM
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Originally Posted by zoom44
sure but i thought it would be good to bring it up anyway- at the least it will confuse taj which should prove humorous and at most he might learn something
Thanks for posting that chart, BTW. I had completely lost track of it and was using blind theoretical VE numbers for everything recently.
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Old 12-07-2007, 09:33 PM
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um, i like chicken.
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Old 12-07-2007, 09:53 PM
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^^ i prefer to eat cows. But yes , chicken is good too.
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