Judge Ito's porting school thread
#31
Originally Posted by bill shurvinton' date='Dec 11 2003, 02:49 AM
Possibly slightly off topic, but I have heared tell of cases where builders have chamfered the rotor edges to increase timing when regs don't allow a bridge.
Looking at the shaping of the closing edge of the port, shaping the rotor at that point could be beneficial over that last 10-15 degrees of inlet duration. May also have some benefit at inlet opening as you are channeling the air down towards the exhaust.
Means you then have to get the whole thing balanced, but wondering if anyone here had seen this done?
Bill
Looking at the shaping of the closing edge of the port, shaping the rotor at that point could be beneficial over that last 10-15 degrees of inlet duration. May also have some benefit at inlet opening as you are channeling the air down towards the exhaust.
Means you then have to get the whole thing balanced, but wondering if anyone here had seen this done?
Bill
for the ultimate street rotary.( unless your in E prod then contact Darrell Drummond). These guys have in house dyno, Mazda support and have lead the racing world in every form of rotary racing. (except drag...Puerto Rico is light years ahead)This is were the experiments can be afforded as well as dyno numbers to support each endeavor.Best O Luck
P.S. I did.
#32
Originally Posted by Srce' date='Dec 11 2003, 12:09 AM
Those are beautifull and very clean, what I'm interested in knowing is wheather or not there's any chance passing emissions with those ports making about 450rwhp. I really want a car that can kill the 1/4 and drive me to school plus the occasinal (yeah right, I meant frequent) highway pull.
Awsome work Ito
Awsome work Ito
#34
Originally Posted by The Ultimate 7' date='Dec 13 2003, 01:09 AM
Hey Judge! Have you ever used this style of porting on a 20b engine? How much power do you think a 20b would be able to put down with this style of porting(without NOS)?
#35
Originally Posted by Judge Ito' date='Dec 10 2003, 03:48 PM
More pixs. notice the upper flow. its flowing right into the closing edge of the port.
thanks
#36
Originally Posted by GTUs' date='Dec 15 2003, 10:24 PM
the reason for eyebrow shape on the closing edge of the port is for the effects of inertial supercharging right? Ito san? because the intake port closing has the greatest effect on VE of the intake cycle as it is trying to sqeezed the last/max of air charge in the chamber. right? it has to do with trying to increase the velocity of the intake air though a narrower passage?
thanks
thanks
#37
Originally Posted by Judge Ito' date='Dec 20 2003, 04:04 AM
You are correct. besides increasing power and torque. This you will notice in the effects of acceleration. It takes less effort to rev an engine with this style of closing the port in comparison to stock ports.
This is great stuff, you have inspired me! I am very much appreciated!! This is like my long distance corresponds course on "Judge Ito's Rotary Porting School".
So, we had touched on the issues of port tunnel shaping and port eyebrow/closing.
Here is my some of my questions:
Does the eyebrow/closing technique ONLY apply to secondary and aux ports? What about the primary port, what can we do to enhance the efficiency of the primary port? Can we apply the eyebrow technique on the primary port? Or there is some difference technique for primary.
I am aware that, a primary port is part of the maximum CFM air-flow a rotary can digest; moreover, I am also aware that the main function of a primary port is generate a high velocity charge through a small channel/port to aid torque and improve air/fuel mixing, during low rpm operation.
After I have good understanding of how porting effect the performance of a rotary, I will ask more specific questions about how to attack a S5 N/A 13B to achieve maximum area under the curve, for a application of high performacne street driving with a chance to past smog test, autoX, track lapping day.
#38
I am going to be porting my engine over the next week, using the information in this post, I am just wondering about the side seals, if the leading edge could fall into the port if you port outwards with only 2-3mm of coner seal supported?.
Thanks
Jason
Thanks
Jason
#39
Originally Posted by jasonD' date='Dec 26 2003, 09:13 PM
I am going to be porting my engine over the next week, using the information in this post, I am just wondering about the side seals, if the leading edge could fall into the port if you port outwards with only 2-3mm of coner seal supported?.
Thanks
Jason
Thanks
Jason
#40
Ill throw in this picture of an extended port. I didn't want to make a new thread on a smaller port.. this port opens a bit later and closes a bit earlier then the wild streetport. I just wanted to keep showing some options in porting sizes. I would post a picture of a mild port but Ito doesn't do MILD. Porting size could be fitted to any application(meaning RPM range and horsepower through rpm range) once you have the intake manifold to match the port size...