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> Is polishing exhaust ports a DIY Job
newto914s
post Jun 16 2007, 01:36 PM
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I'm thinking about going up to 96mm Bores. I had the heads completely re-done at EMS in Cali around a 1k miles ago, and would rather not ship them back and forth for a port polish. I was thinking about maybe getting the ports opened up, but have read here it's not really nessisery for such a small bump in displacement. So is this something that can be done with a Dremel, or should I not even bother.
Thanks
Samson

Info that is ussualy asked for.
2L with stock D-jet, Soon to be SS HE out a Bursch, external Setrab oil cooler, Mostly street some auto-X in time.
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So.Cal.914
post Jun 16 2007, 02:29 PM
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I found it necessary to remove the valves and guides to do a proper job. The

intakes weren't to bad but the exhaust ports the metal was different, harder, more

brittle(maybe from the heat) and was alot more work. If you just had the heads

done, IMHO, I would not mess with it.
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newto914s
post Jun 16 2007, 02:35 PM
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Taking the valves out is one thing. I'm not going to mess with the guides.
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Bleyseng
post Jun 16 2007, 05:16 PM
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don't bother if you are using the stock cam grind..
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Johny Blackstain
post Jun 16 2007, 09:18 PM
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I dont think that porting & polishing is something you just do... I think it's like anything else: practice makes perfect. I would experiment 1st & not on a teener! (IMG:style_emoticons/default/biggrin.gif)


(IMG:style_emoticons/default/cool_shades.gif)
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scotty b
post Jun 16 2007, 10:13 PM
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FYI polishing a teeners port WILL get you jail time........ (IMG:style_emoticons/default/unsure.gif)
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Johny Blackstain
post Jun 16 2007, 10:47 PM
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QUOTE(scotty b @ Jun 17 2007, 12:13 AM) *

FYI polishing a teeners port WILL get you jail time........ (IMG:style_emoticons/default/unsure.gif)

(IMG:style_emoticons/default/av-943.gif) Pedophile (IMG:style_emoticons/default/biggrin.gif) .


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So.Cal.914
post Jun 17 2007, 12:25 AM
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QUOTE(scotty b @ Jun 16 2007, 09:13 PM) *

FYI polishing a teeners port WILL get you jail time........ (IMG:style_emoticons/default/unsure.gif)


(IMG:style_emoticons/default/av-943.gif)
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G e o r g e
post Jun 17 2007, 12:38 AM
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QUOTE

practice makes perfect. I would experiment 1st


(IMG:style_emoticons/default/sheeplove.gif) (IMG:style_emoticons/default/slap.gif) (IMG:style_emoticons/default/grouphug.gif)







QUOTE
& not on a teen! (IMG:style_emoticons/default/biggrin.gif)




but this is sound legal advise (IMG:style_emoticons/default/thumb3d.gif)
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Twystd1
post Jun 17 2007, 12:46 AM
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You don't want to know... really.....
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Your stock 2.0 heads flow more air than your stock djet can use.

Bone stock 2.0 heads in the proper configuration of cam, springs, intake, compression ratio, bore, etc., etc.....

Can go past 140+ HP with no porting.

Jake Raby can get more than that out of 1.8 head with minimal cleanup.

If you want the fun of polishing the exhaust. Go for it. Pull the valves out first. I suggest you DO NOT polish the intake tract. Clean it up yes... Polish no. Better to have a slightly rough intake tract (like 160-180 grit) rather than a polished port and intake manifold.
Ifn ya wanna know why. PM me for a phone number. Too long to write it up.

By the way... if ya just happen to touch the valve seat surface while you are doing this. You are going to have to get another valve job. So duct tape is your friend if you use a small tool like a dremel.

If you use a die grinder like I do. It will chew through duct tape instantly.
Die Grinder

Be careful. Look on the web for the DIY yourself port polishing web sites. And have some fun.

DO NOT PORT THESE HEADS unless you know a bunch more about head porting THESE SPECIFIC TYPE IV HEADS. These ain't chevy heads.

In truth. Polishing and/or porting. Based on your existing application.
Won't make any noticeable difference in your torque or HP on a djet engine.


That is my experience. Yours may be different.

Cheers and good luck.

Clayton
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newto914s
post Jun 17 2007, 09:59 AM
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Thanks guys. I've read about how turbulance on the intake is neccicary, and I wasn't going to be doing any porting on the exhaust, just a poilsh, but it sounds like tho risk/reward would be to high so I'm just going to leave them alone. I should have tried googling the topic, lots of good info out there on how to do it.
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Joe Ricard
post Jun 17 2007, 11:49 AM
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I just finished porting my 2.0L
heads on the exhaust side. matched up the Tangerine stub pipes and shortened the inside radious making it smoother.

Will it make a difference Probably with my engne combo.

and no you can't ask what it is anymore.
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