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Old 05-03-2005, 05:32 PM   #1
ride5000
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Default ported/polished/wrapped oem manifolds webpage

teaser pic...



rest of writeup...

http://ken-gilbert.com/wrx/porting/p...t_manifold.htm

haven't had a chance to put them on the car yet... this week i hope! i will try to get before and after datalogs.

comments appreciated
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Old 05-03-2005, 05:48 PM   #2
cdvma
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Looks like very impressive work, Ken.

That is going to be one fast spooling machine...!
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Old 05-03-2005, 05:52 PM   #3
garie
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great writeup. Very thorough with many pictures. The best writeup w/ pictures on pp the stock headers so far.

how long did that take you? how many man hrs?

great job man...and how does is compare to before? can you compare it to aftermarket headers?
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Old 05-03-2005, 06:40 PM   #4
InfamousDX
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That musta been a lot of man hours! But it looks great
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Old 05-03-2005, 06:43 PM   #5
steve
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Good work ride5000.
I just P&P'd my exhaust manifolds, and the results are great. Well worth the many hours to do it right.
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Old 05-03-2005, 07:33 PM   #6
djerickd
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awesome!
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Old 05-03-2005, 07:33 PM   #7
SleepinRex
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nice ken. Good to see a fellow p&p'er doing some good work. Love how pretty manifolds get... lol




U also may wanna try a dremel or rotozip with a flex shaft. They allow me to reach farther than even my 7 inch mandrel will allow me to. lets me reach all the way down.
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Old 05-03-2005, 07:51 PM   #8
03WREX
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That's a very good write up and I give you props for doing all of that yourself. I am curious on what type of gains you will see from this. Please keep us all updated.

I'm sure this was a work in progress but can you estimate about how long this took you to do? Definitely post this on scoobymods if you haven't already.
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Old 05-03-2005, 08:06 PM   #9
kennyvb
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ken, good work. let us know how the tape holds up. you didn't remove disassemble the turbo before porting?!?
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Old 05-03-2005, 09:39 PM   #10
jamesfacts
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I really have to do this before my motor goes in.

I think Mike and I are going to attempt this sometime over the next week at Jon's actually. I hope it comes out as nice as yours. Are you recycling the gaskets?
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Old 05-03-2005, 09:50 PM   #11
distorto
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that looks awesome, but why the work on the outside?
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Old 05-03-2005, 10:12 PM   #12
CMJ
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Quote:
Originally Posted by distorto
that looks awesome, but why the work on the outside?
Polished metal retains more heat than a rough surface would.
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Old 05-06-2005, 11:32 AM   #13
spit_heron
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Quote:
Originally Posted by CMJ
Polished metal retains more heat than a rough surface would.
well, not when its wrapped and taped.
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Old 05-06-2005, 12:27 PM   #14
ride5000
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Quote:
Originally Posted by spit_heron
well, not when its wrapped and taped.
sure it does!
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Old 05-06-2005, 12:48 PM   #15
spit_heron
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Quote:
Originally Posted by ride5000
sure it does!
i would think the primary modes of heat transfer would be conduction through the walls, conduction to the wrap (with a pretty high contact resistance), conduction to the tape, then convection off the tape, with a little emiittance to surroundings. No?
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Old 05-06-2005, 01:27 PM   #16
spit_heron
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with unwrapped manifolds, radiation off the cast walls is certainly a significant loss of heat.

I guess im saying that the only surface that can radiate to surroundings in your setup is the outer layer, i.e. the tape (which will have a pretty low emissivity).

As you said, it seems the benefits of not having an abrasive surface against the wrap is worth the time itself though. Parts look good man! Let us know how that tape holds up.
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Old 05-03-2005, 10:52 PM   #17
LiquidForce
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I ported and polished mine when I had them off but I didn't bother with the outside. How long do you think before rust sets in and returns them to the original state?
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Old 05-03-2005, 11:50 PM   #18
needmoreboost
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Wow that is some great work right there. Makes me wanna take off my manifold and go at it with my dremel and aluminum carbide bits.. at least as far as it'll let me (which isn't very). Time to buy a flex shaft from sears.
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Old 05-03-2005, 11:58 PM   #19
strohausii
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noob question: is it true the manifold's holes are smaller than the actual ones on the head? To increase the velocity? I thought I had read this early on before the wrx came.
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Old 05-04-2005, 01:27 AM   #20
ebeck
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Is this completed? There is alot of meat left to get to the gasket seal ring as far port matching goes.

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Old 05-04-2005, 02:15 AM   #21
SleepinRex
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Quote:
Originally Posted by ebeck
Is this completed? There is alot of meat left to get to the gasket seal ring as far port matching goes.


i know it may look that there is a lot of the meet around, but trust me that this is completed. Ive done near 10 more since this, and all have been within 1mm for some gasket play. ill post anot pic with teh gasket on.
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Old 05-04-2005, 03:32 AM   #22
booimaghost
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I have read that a good P&P on your stock headers can actually be better than a aftermarket down pipe.... is this true?
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Old 05-04-2005, 10:00 AM   #23
Davenow
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Quote:
Originally Posted by booimaghost
I have read that a good P&P on your stock headers can actually be better than a aftermarket down pipe.... is this true?
None, did you mean aftermarket header?

If so, then yes, ported stock manifolds work WAY better than aftermarket headers.
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Old 05-19-2005, 07:38 PM   #24
popcrux
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Quote:
Originally Posted by Davenow
If so, then yes, ported stock manifolds work WAY better than aftermarket headers.
Ok Dave, I've been reading up on headers and I was wondering if you could explain this one to me. I know the stock headers are cast iron so they will retain heat and spool up faster than aftermarket headers. If the airflow from P&P'ing is similar to that of an aftermarket header, then do these two attributes combine to make the P&P of the stock header a much better option?

What about wraps and/or heat coating to help retain heat on the aftermarket headers?

What about P&P'ing aftermarket headers (such as the Gruppe-S) and heat wrapping those. Would you still say a P&P'd stock header would be superior to this route?
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Old 05-04-2005, 03:39 AM   #25
SleepinRex
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check out my thread "port and polish madness" i have a bunch of impressions on there. EVery single customer so far has been very pleased with the gains, especially for the price.
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