Howto calculate an Intake Mani
10-20-2008, 06:23 AM
#1
0.5 BAR
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Join Date: Oct 2008
Posts: 136
Howto calculate an Intake Mani
Iam thinking about to build my own Intake mani. The reason is the OEM one is eco ---- and only good to drive slow and save gas 
ive some links howto build a mani but not mani that say how its calculated :1
ive some links howto build a mani but not mani that say how its calculated :1
10-20-2008, 11:20 AM
#2
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Join Date: Feb 2003
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Re: Howto calculate an Intake Mani
General rule of thumb is ake the plenum size 1.5 times the swept displacement. Two liter engine = three liter plenum.
I would base the ports off of the stock manifold. Making them a little shorter biases powerband upward. Making them bigger around raises the choke point of airflow. Make your changes small to modest is my best recommendation, you can make the car a real dog if you aren't careful.
Anything that comes with a crappy IM usually comes with crappy cam(s). Plan accordingly.
I would base the ports off of the stock manifold. Making them a little shorter biases powerband upward. Making them bigger around raises the choke point of airflow. Make your changes small to modest is my best recommendation, you can make the car a real dog if you aren't careful.
Anything that comes with a crappy IM usually comes with crappy cam(s). Plan accordingly.
10-20-2008, 11:29 AM
#3
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Re: Howto calculate an Intake Mani
Oh yes crappy camīs is involved too
actualy the whole head is full of ----
but there is no replacement so i go on to tray my best with PNP and a custom Intake Mani + a nice set of headers
3liters? hmmm ok must i follow a special design like taper the plenum?
its an inline 6
actualy the whole head is full of ----
but there is no replacement so i go on to tray my best with PNP and a custom Intake Mani + a nice set of headers
3liters? hmmm ok must i follow a special design like taper the plenum?
its an inline 6
10-20-2008, 06:38 PM
#4
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Join Date: Mar 2008
Location: texas
Posts: 2,598
Re: Howto calculate an Intake Mani
this is some ---- i found. i did not read any of this but it might help you http://www.phys.unsw.edu.au/jw/Helmholtz.html and http://www.physicsforums.com/showthread.php?t=80364
10-20-2008, 07:01 PM
#5
0.5 BAR
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Join Date: Oct 2008
Posts: 136
Re: Howto calculate an Intake Mani
first link 
do iam look like a ------- rocket sincetist??
second link is gold worth
Thanks alot
i think i go the lazy way with ibs + plenum and call it skyline style
why is designing a intake mani not so easy like an Exhaust mani
God bless Corky bell and his book about turbos
BTW
i hate this head design look at the injector position
do iam look like a ------- rocket sincetist??second link is gold worth
Thanks alot
i think i go the lazy way with ibs + plenum and call it skyline style
why is designing a intake mani not so easy like an Exhaust mani
God bless Corky bell and his book about turbos
BTW
i hate this head design look at the injector position
10-21-2008, 06:49 AM
#10
0.5 BAR
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Join Date: Oct 2008
Posts: 136
Re: Howto calculate an Intake Mani
its not my car just to show how the head looks
Its an Lexus IS 200
btw
on the pic is the car from the pro drifter Monster Matt
download link?
Its an Lexus IS 200
btw
on the pic is the car from the pro drifter Monster Matt
his supercharger book has some more upto date info
