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Location:
South Australia
Registered:
July 2002
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N/A Single Throttle manifold design
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Thu, 14 October 2004 15:35
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Alright, I'm having a bit of trouble finding the information I need, I'm wondering if anyone knows of any good text/reference books for this subject, but I'm looking at a custom intake manifold with single throttle body for a 3S-GE. I need to know a bit more about what kind of shape/lengths I am looking at and what goes on with the harmonics and flows in these things!
I have access to a damn huge library at Uni (Barr Smith) so chances are I could find stuff in there, but some titles would help alot as there is alot of irrelevant shit there as well 
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Location:
Canberra
Registered:
May 2002
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Re: N/A Single Throttle manifold design
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Thu, 14 October 2004 23:30
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If you have a look at this thread:
http://forums.toymods.org.au/index.php?t=msg&t h=47927&start=0&rid=131&S=3d4b12920c72 77c242d81f5827b0d7eb
Most of the information you will need is in there. The design should be pretty much the same for a single TB. The only difference will be the plenum which is where it gets tricky, you can get all sorts of resomances inside the plenum which can either hinder or help you, but, unfortunately it's almost impossible to calculate.
I'd suggest for plenums, to just copy the design of something which seems to work and scale it according to the space you have.
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Location:
Lost in the K hole
Registered:
May 2002
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Re: N/A Single Throttle manifold design
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Fri, 15 October 2004 00:03
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basic rule of thumb with the plenum is to bellmouth the runners into the plenum around 1/3 the height of the plenum, with no bellmouth coming withing 1/2 a dia of the wall of the plenum.
plenum volume should be 2x the swept capacity of the engine
if the throttl is forward facing, a rearward taper on the plenum is required, exactly how much im unsure, and is best established on a flow bench (to make sure no one cyl is starved)
see if you can get jase's (aka yelorolla) thoughts on this
runer length should be as described in the other thread.
t/b size should similarly be based on peak flow rate of the engine (using the cfm model i initially used)
cheers
ed
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Location:
South Australia
Registered:
July 2002
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Re: N/A Single Throttle manifold design
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Sun, 17 October 2004 08:13
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Alright - sorry 'bout my retardation but when you say| Quote: |
bellmouth the runners into the plenum around 1/3 the height of the plenum
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what exactly do you mean, that the runners should meet at a horizontal line along 1/3 the height of the plenum if the plenum is similar to a horizontally oriented sort of rectangle/box?
The bellmouth not coming in within 1/2 diameter means that say bellmouth was about 40 mm - then the plenum must be at least 20mm wide (along the axis of the runner/bellmouth) and at least 60mm high - right (so that the bottom 1/3rd is at least 20mm from the bellmouth).
If the throttle body is located centrally, would the flow favour the cylinders based on firing order or just pathlines of the flow?
I'm still trying to decipher how to calculate runner length btw 
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