Port and Polish? - Page 5 - Toyota GR86, 86, FR-S and Subaru BRZ Forum & Owners Community

youcantseeme24 · 06-22-2014, 12:40 AM

man.... just cant kill this thread!

oldeskewltoy · 09-01-2014, 06:33 PM

Quote:

Originally Posted by Lonewolf

@oldeskewltoy

So, were you ever able to get a hold of a FA20 to work your magic?

nope..... I've managed to acquire a couple of Nissan heads (CA18DET, and SR20DE)... but still no FA20 heads

but I'm still interested

Here is a recent 4AG head....

recent exhaust port going through transition from stock to ported

Tim Radley · 11-16-2014, 05:04 AM

Quote:

Originally Posted by oldeskewltoy

the more air flow, the better....

But that is not always true. Sometimes more airflow leads to a decrease in horsepower

Turdinator · 11-16-2014, 06:46 PM

Quote:

Originally Posted by Tim Radley

But that is not always true. Sometimes more airflow leads to a decrease in horsepower

Can you explain this statement?

oldeskewltoy · 12-02-2014, 12:36 PM

Quote:

Originally Posted by Tim Radley

But that is not always true. Sometimes more airflow leads to a decrease in horsepower

You Fox News'd me... you took a small bit and blew it out of its context.... Here is its context....

Quote:

Originally Posted by andrew20195

I thought the short radius doesn't really matter, as inertia will force a vast majority of the air along the long radius?

Quote:

Originally Posted by oldeskewltoy

Quote:

Originally Posted by andrew20195

I thought the short radius doesn't really matter, as inertia will force a vast majority of the air along the long radius?

In essence you are correct... but if we can also gently shape the short radius to aid in filling.... the more air flow, the better.... and that includes the short radius... by improving ALL areas we improve the ports function, and find more horsepower where there was less.

Oh... and I'm not talking about "hogging" anything out either... My goal in porting is to improve the casting... because the basic casting is a mass produced part.... and as such has flaws

small thread divert.... A TV show... on Ferrari's factory explained that Ferrari has highly skilled technicians porting the CASTING SAND before the metal is poured... because it was less costly to then perfect the shape in sand, then it was to pay someone to port the finished castings...

Back to Toyota/Subaru and the FA20... as advanced as this engine is... it still is a mass produced casting without any one porting/perfecting it... either before, or after casting.

Quote:

Oh... and I'm not talking about "hogging" anything out either...

A lot can be done inside the port.... without hogging anything

exhaust

intake

As you can see in the above shots.... the bowl to port transitions have been blended to allow for added airflow in the same overall space.

See..... No hogging...

Now... to answer your question... More air VOLUME may not be good... because at some point you sacrifice air velocity... for volume. Velocity is important because it helps in cylinder filling.

The IDEAL... is to increase the volume without decreasing velocity.

Tim Radley · 12-10-2014, 12:23 PM

Quote:

Originally Posted by oldeskewltoy

The IDEAL... is to increase the volume without decreasing velocity.

But why would you necessarily want to increase the air volume the port can flow?

Quote:

Originally Posted by Turdinator

Can you explain this statement?

You want the correct flow. Not too much, not too little.

ort895 · 09-09-2015, 08:54 PM

how much would should this run us?

ML · 12-17-2018, 07:27 PM

I am the thread necromancer. Any updates in this field?

Lantanafrs2 · 12-17-2018, 10:18 PM

No and for good reason. Not worth it.

SuperTom · 12-18-2018, 05:16 PM

Since there are companies working on intake manifolds this would be a good complimentary mod to go along. When trying to squeeze every ounce of power out of an NA setup we the consumer will determine if its "worth it" or not.

ML · 12-18-2018, 05:35 PM

Every "built" motor I see for sale these days say they have a P&P so you can't tell me people aren't doing it.

Lantanafrs2 · 12-18-2018, 05:53 PM

If it worked on an na platform there would be dyno charts all over the place. Stock cams, stock rpm limit no dice imo

Lantanafrs2 · 12-18-2018, 05:55 PM

Ports don't need to reflect light to flow well btw.

Lantanafrs2 · 12-18-2018, 06:31 PM

Exhaust ports many times are shaped for anti reversion so you need to be careful there.

09-09-2015, 08:54 PM	#63
ort895 Senior Member Join Date: Aug 2014 Drives: 2013 BRZ Location: North Carolina Posts: 695 Thanks: 195 Thanked 139 Times in 113 Posts Mentioned: 2 Post(s) Tagged: 0 Thread(s)	how much would should this run us? __________________ Yeah its an auto, deal with it.

12-18-2018, 05:16 PM	#66
SuperTom Senior Member Join Date: Feb 2014 Drives: C5, GT-86, '24 Colorado TrailBoss Location: New Castle DE Posts: 1,576 Thanks: 1,682 Thanked 1,049 Times in 582 Posts Mentioned: 6 Post(s) Tagged: 0 Thread(s)	Since there are companies working on intake manifolds this would be a good complimentary mod to go along. When trying to squeeze every ounce of power out of an NA setup we the consumer will determine if its "worth it" or not. __________________

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06-22-2014, 12:40 AM	#57
youcantseeme24 Senior Member Join Date: Aug 2012 Drives: 2013 subaru brz Location: United States Posts: 136 Thanks: 102 Thanked 42 Times in 29 Posts Mentioned: 0 Post(s) Tagged: 0 Thread(s)	man.... just cant kill this thread!

12-17-2018, 10:18 PM	#65
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,562 Thanks: 2,568 Thanked 3,126 Times in 1,680 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	No and for good reason. Not worth it.

12-18-2018, 05:53 PM	#68
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,562 Thanks: 2,568 Thanked 3,126 Times in 1,680 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	If it worked on an na platform there would be dyno charts all over the place. Stock cams, stock rpm limit no dice imo

12-18-2018, 05:55 PM	#69
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,562 Thanks: 2,568 Thanked 3,126 Times in 1,680 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Ports don't need to reflect light to flow well btw.

12-18-2018, 06:31 PM	#70
Lantanafrs2 Senior Member Join Date: Jan 2018 Drives: 2013 frs red Location: South Florida Posts: 3,562 Thanks: 2,568 Thanked 3,126 Times in 1,680 Posts Mentioned: 6 Post(s) Tagged: 1 Thread(s)	Exhaust ports many times are shaped for anti reversion so you need to be careful there.

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