Judge Ito's porting school thread
12-10-2003, 05:34 PM
#21
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Originally Posted by GTUs' date='Nov 26 2003, 12:31 AM
excellent!
Judge, do you have picture of the runner of that port. like you said, the shape of port open matters, but the shape of the tunnel/port matter a lot too.
My understanding is that the tunnel/port runner suppose to shape like air nozzle which has throw/choke point and discharge/divergence. the area of throw/choke point determines the max amount of CFM(Velocity x Area - Losses) before it choke.
the way you shaped the port opening or should I said the way you shaped the discharge section matchs to my ideal port shape for discharge, that I had in mind. It will be nice to see how the master shape the tunnel!!
Judge, do you have picture of the runner of that port. like you said, the shape of port open matters, but the shape of the tunnel/port matter a lot too.
My understanding is that the tunnel/port runner suppose to shape like air nozzle which has throw/choke point and discharge/divergence. the area of throw/choke point determines the max amount of CFM(Velocity x Area - Losses) before it choke.
the way you shaped the port opening or should I said the way you shaped the discharge section matchs to my ideal port shape for discharge, that I had in mind. It will be nice to see how the master shape the tunnel!!
12-10-2003, 05:43 PM
#23
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I have a 2 step type of finish I give my ports. First I blend all the rough cut left by the high speed grinder with a slow speed grinder, then I blend a smooth port with a slower speed on the grinder. I don't like a glass finish on the ports. Not many people do. Personal experiences has landed me a better tunning ability with a smooth finish but not a glass finish.
12-10-2003, 05:56 PM
#25
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This is the upper part of the plate. upside down. Here I left a visual line so you could see the way it needs to be ported from the outside of the port to the inside of the port. A nice path from one point to the other then blended together. This line was blended later on.
12-10-2003, 06:33 PM
#27
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Originally Posted by Drago86' date='Dec 11 2003, 12:11 AM
when you say the stock ports have a venturi built in, are you talking about the slight narrowing of the port a few mill's from the manifold side entrance?
12-11-2003, 02:09 AM
#28
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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
12-11-2003, 04:49 AM
#30
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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
