Porting/Polishing - Subaru Enthusiasts Car Club of the Sierras

100_Percent_Juice · 2007-01-12, 12:18 AM

I was seeing a lot of stuff on nasioc about porting the exhaust manifolds. Is there a place in town that does it cheap or is it best to diy. I have experience with metal working and all that business, ive just never ported or polished before. Has anyone here done it? Tips, links, emoticons?

MPREZIV · 2007-01-12, 07:27 AM

Frankly, in my opinion, the only way to learn how to port is trial and error. Lots of error. It's always been suggested that the first part you ever try to port should NOT be one that you need. Most old hot-rod guys I know would go get some junk heads/manifolds from a yard and practice on them, just to avoid F*ing up something they need to use. It's always surprising how fast metal comes off a part when you shove a spinning carbide bit into it!

My emoticon is this

...it's my favorite!

zpeed · 2007-01-12, 10:18 AM

I ported my Turbo and Exhaust Manifold. Make sure you have a good bit and a BIG air tank. Don't even think about Dremel. My old Talon did pull stronger and longer after the port job but no real prove from Dyno.

100_Percent_Juice · 2007-01-12, 11:26 AM

I just want to know if its worth my time doing it. And im mainly talking about the exhaust manifold. I dont wanna touch this stock turbo because im just gonna swap it out later anyways.

sperry · 2007-01-12, 12:01 PM

I don't know what class you plan to run in at autocross, but porting/polishing the wrong thing can end you up in Street Mod, if that's something you care about.

100_Percent_Juice · 2007-01-12, 12:19 PM

What class would I run in currently,
Cobb AP stage 2
3" TBE, no cats, gutted uppipe
intercooler y-pipe kit.

I would like to run at the top of a very low class. As in wrestling I would rather be 205 in the 175-205* class instead of a 206 in the 206-245* class. Ya feel me?

*not real weight class.

khail19 · 2007-01-12, 12:21 PM

No brake/suspension mods? Stock wheels?

sperry · 2007-01-12, 12:33 PM

Quote:

Originally Posted by 100_Percent_Juice

What class would I run in currently,
Cobb AP stage 2
3" TBE, no cats, gutted uppipe
intercooler y-pipe kit.

I would like to run at the top of a very low class. As in wrestling I would rather be 205 in the 175-205* class instead of a 206 in the 206-245* class. Ya feel me?

*not real weight class.

Sounds like ESP to me.

Kevin M · 2007-01-12, 12:45 PM

ESP unless there are other mods like ALK or brake caliper changes or something that would bump to SM. And porting anything other than the manifolds is not legal except in SM or higher.

sperry · 2007-01-12, 12:46 PM

Quote:

Originally Posted by BAN SUVS

ESP unless there are other mods like ALK or brake caliper changes or something that would bump to SM. And porting anything other than the manifolds is not legal except in SM or higher.

If you can replace the headers in ESP, why can't you port them?

100_Percent_Juice · 2007-01-12, 12:53 PM

Quote:

Originally Posted by khail19

No brake/suspension mods? Stock wheels?

Stock wheels but the owner before me put slotted/drilled rotors on it.

sperry · 2007-01-12, 12:55 PM

Quote:

Originally Posted by 100_Percent_Juice

Stock wheels but the owner before me put slotted/drilled rotors on it.

Rotors are fine as long as they're stock dimensions.

Reading the rule book yourself is the easiest way to find all this out:

http://www.scca.com/_FileLibrary/File/2007SoloRules.pdf

Kevin M · 2007-01-12, 12:59 PM

Quote:

Originally Posted by sperry

If you can replace the headers in ESP, why can't you port them?

Ninja edit FTW.

sperry · 2007-01-12, 01:02 PM

Quote:

Originally Posted by BAN SUVS

Ninja edit FTW.

Huh? I didn't edit anything.

You said porting *anything* is illegal in all classes but SM and up... but you can certainly port anything that's legally replaceable. IIRC, SP lets you replace exhaust components including the headers, so why would 100%'s wish to port his exhaust manifold be illegal?

Edit: I get it... you ninja edited... n/m.

Oh an BTW, I don't think porting the intake manifold is legal in SP... just the exhaust.

Kevin M · 2007-01-12, 01:07 PM

Intake mani is legal to replace in SP. I think it's to simplify the engine update/backdating issue. I know I'd much rather be able to replace cams than intake manifolds, but I suppose flat 4 guys might be in the minority there.

rubberbiscuitt · 2007-01-12, 05:31 PM

should you decide to do the porting, spend the extra money on a good carbide bit. single cut for aluminum and other soft and/or non ferrous material. double cut for ferrous stainless, and other hard materials(yes use this one). dip the bit in oil for cooling (cutting fluid or motor oil, i use motor oil because cost). i have a "tungsten/carbide" cutting bit, and it seems ok. so if you have a choice, i wouldn't pay more for the added tungsten. usually your local weld shop will carry good stuff. or if you must save a few pennys, try these:this is what grainger has to offer and this is what enco has to offer

2007-01-12, 12:18 AM	#1
100_Percent_Juice (40 percent vodka) Real Name: Joel Join Date: Oct 2006 Location: Reno, NV Posts: 4,446 Car: 2004WRX Class: Baby-Hauler/GroceryGetter	Porting/Polishing I was seeing a lot of stuff on nasioc about porting the exhaust manifolds. Is there a place in town that does it cheap or is it best to diy. I have experience with metal working and all that business, ive just never ported or polished before. Has anyone here done it? Tips, links, emoticons? __________________ "A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin

2007-01-12, 07:27 AM	#2
MPREZIV Token Real Name: Le Stig Afrique? Join Date: Jun 2005 Location: sitting next to a big yellow box Posts: 3,589 Car: 2001 Impreza 2.5 RS Class: 05 TDSP No, I won't work on your car. F your car*	Frankly, in my opinion, the only way to learn how to port is trial and error. Lots of error. It's always been suggested that the first part you ever try to port should NOT be one that you need. Most old hot-rod guys I know would go get some junk heads/manifolds from a yard and practice on them, just to avoid Fing up something they need to use. It's always surprising how fast metal comes off a part when you shove a spinning carbide bit into it! My emoticon is this ...it's my favorite! __________________ "...these condoms have a topical anesthetic to reduce sensitivity, so you can last longer. What a paradox. You can't feel a thing, but you can fck for HOURS..."

2007-01-12, 11:26 AM	#4
100_Percent_Juice (40 percent vodka) Real Name: Joel Join Date: Oct 2006 Location: Reno, NV Posts: 4,446 Car: 2004WRX Class: Baby-Hauler/GroceryGetter	I just want to know if its worth my time doing it. And im mainly talking about the exhaust manifold. I dont wanna touch this stock turbo because im just gonna swap it out later anyways. __________________ "A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin

2007-01-12, 12:01 PM	#5
sperry The Doink Real Name: Scott Join Date: Nov 2002 Location: Portland, OR Posts: 20,335 Car: '09 OBXT, '02 WRX, '96 Miata Class: PDX/TT-6 The way out is through	I don't know what class you plan to run in at autocross, but porting/polishing the wrong thing can end you up in Street Mod, if that's something you care about. __________________ Is you is, or is you ain't, my con-stit-u-ints?

2007-01-12, 12:19 PM	#6
100_Percent_Juice (40 percent vodka) Real Name: Joel Join Date: Oct 2006 Location: Reno, NV Posts: 4,446 Car: 2004WRX Class: Baby-Hauler/GroceryGetter	What class would I run in currently, Cobb AP stage 2 3" TBE, no cats, gutted uppipe intercooler y-pipe kit. I would like to run at the top of a very low class. As in wrestling I would rather be 205 in the 175-205* class instead of a 206 in the 206-245* class. Ya feel me? *not real weight class. __________________ "A power nap is when you sleep on someone who is weaker than you." - Dimitri Martin

2007-01-12, 10:18 AM	#3
zpeed EJ251 Real Name: Nat S Join Date: Feb 2004 Location: Reno, NV USA Posts: 743 Car: 06 S2000 Class: RNP & PDX	I ported my Turbo and Exhaust Manifold. Make sure you have a good bit and a BIG air tank. Don't even think about Dremel. My old Talon did pull stronger and longer after the port job but no real prove from Dyno.

2007-01-12, 12:21 PM	#7
khail19 EJ205 Real Name: Khail Join Date: Dec 2002 Location: Reno, NV Posts: 1,769 Car: 2016 VW GTI Meets? We have meets?	No brake/suspension mods? Stock wheels?

2007-01-12, 12:45 PM	#9
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	ESP unless there are other mods like ALK or brake caliper changes or something that would bump to SM. And porting anything other than the manifolds is not legal except in SM or higher. __________________ FWD is the new AWD

2007-01-12, 01:07 PM	#15
Kevin M EJ22T Join Date: Sep 2003 Location: Reno Posts: 9,445 Car: '93/'01 GF6, mostly red Class: 19 FP	Intake mani is legal to replace in SP. I think it's to simplify the engine update/backdating issue. I know I'd much rather be able to replace cams than intake manifolds, but I suppose flat 4 guys might be in the minority there. __________________ FWD is the new AWD

2007-01-12, 05:31 PM	#16
rubberbiscuitt EJ22 Join Date: Mar 2006 Location: south lake tahoe Posts: 234 Car: L just push the brake pedal.	should you decide to do the porting, spend the extra money on a good carbide bit. single cut for aluminum and other soft and/or non ferrous material. double cut for ferrous stainless, and other hard materials(yes use this one). dip the bit in oil for cooling (cutting fluid or motor oil, i use motor oil because cost). i have a "tungsten/carbide" cutting bit, and it seems ok. so if you have a choice, i wouldn't pay more for the added tungsten. usually your local weld shop will carry good stuff. or if you must save a few pennys, try these:this is what grainger has to offer and this is what enco has to offer