The Perfect Intake Manifold

[spetz]

To deviate a bit from my other post (200kw K24/20), it seems that the intake manifold has a very pronounced and dramatic effect on the power delivery of an engine. Of course I am aware a really bad intake manifold against a really good one would have a huge disparity in power and performance, however it seemed that there is a big difference between a very good intake manifold and a very very good intake manifold.

So, my question is, can the perfect intake manifold be designed from hard calculations and computer software, or is it a combination of trial and error to see what each specific engine "likes" and "dislikes"?

[mocchi]

no such thing as one size fits all.
different IM made for different purpose.

[mocchi]

add this for jo0.

http://www.superstreetonline.com/tec...t/viewall.html

[spetz]

Thanks for the site,
But I was more curious as to computer simulation software, and whether an intake manifold can be designed knowing all the specifics and uses of the motor to the best degree, or do calculations just put it in a ballpark figure and then trial and error depending on different engines will dictate the best route?
I understand each manifold design will have it's ideal use, but with that use and goal in mind, is it possible to create the "perfect" intake manifold on calculations alone?

[GSi_PSi]

have you seen the JDM yard intake manifold for k series? YBOOST gained 17kw atw when installed.
I believe its jdm k20a manifold cut and welded into to a shape to allow throttle body to suck in direct air from the front of the engine.

[mocchi]

have you seen the JDM yard intake manifold for k series? YBOOST gained 17kw atw when installed.
I believe its jdm k20a manifold cut and welded into to a shape to allow throttle body to suck in direct air from the front of the engine.
[IMG]http://ll.speedhunters.com/u/f/eagames/NFS/speedhunters.com/Images/Dino%20Dalle%20Carbonare/2011/OCT2011/YunasCivic/IMG_0142.jpg[/MG]

[IMG]http://ll.speedhunters.com/u/f/eagames/NFS/speedhunters.com/Images/Dino%20Dalle%20Carbonare/2011/OCT2011/YunasCivic/AY0F5669.jpg[IMG]

brotato, i made a mistake by not reading his question carefully.
i hope this thread will not become a RBC vs RRC vs RSP or JDMYard IM thread.

afaik, yes software simulation will be used to theoretically calculate IM design.
how accurate or perfect it will be heavily depends on the programmers.
actual results will probably very close if software developer have F1 budget.

[exquisit]

what was the previous mani bfor the swap?

have you seen the JDM yard intake manifold for k series? YBOOST gained 17kw atw when installed.
I believe its jdm k20a manifold cut and welded into to a shape to allow throttle body to suck in direct air from the front of the engine.

[GSi_PSi]

I believe it was the same stock Jdm k20a one which was later modified

[spetz]

Ok, so we know the theory behind a good intake manifold. Does this mean if this theory is applied then the results will be good?

For example we know (this may not be 100% accurate by it is for arguments sake):
1. Plenum should be around 1.5X the engine capacity
2. Runners should be 10% larger than the valves
3. No sharp edges, no sharp turns
4. Design in such a way that all cylinders get equal flow
5. 25cm runner length for 8,000rpm peak torque
6. Ram tubes aid in power

Now lets say all the above are 100% accurate, and lets say we implemented 5 other points that would be an intake manifold a good design. If these were following is it likely to be a better design than the OEM manifold?

[mocchi]

Ok, so we know the theory behind a good intake manifold. Does this mean if this theory is applied then the results will be good?

For example we know (this may not be 100% accurate by it is for arguments sake):
1. Plenum should be around 1.5X the engine capacity
2. Runners should be 10% larger than the valves
3. No sharp edges, no sharp turns
4. Design in such a way that all cylinders get equal flow
5. 25cm runner length for 8,000rpm peak torque
6. Ram tubes aid in power

Now lets say all the above are 100% accurate, and lets say we implemented 5 other points that would be an intake manifold a good design. If these were following is it likely to be a better design than the OEM manifold?

^ source please. i would like to learn more.

[spetz]

I cannot tell you the exact source I just remember reading these things while researching intake manifolds.

[EG5]

what was the previous mani bfor the swap?

It was PRC Manifold.
We started those manifold back in 2006