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| Engineering/ Technical Ask technical questions about cars. Do you know how a car engine works? |
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#2
09-22-2002, 10:30 PM
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Porting is when you enlarge a chamber for more airflow usually. It is done using anything from a die grinder to a dremel depending on what you need to port. The idea is that stock head castings are very restrictive and do not allow for the actual amount of potential air to move through your cylinder head.
Polishing is basically the process that happens after you Port the head. The idea here is to make the surfaces of the intake and exhaust ports as smooth as possible. This cuts down on restriction when the air "rubs" against the wall of the head as it passes through. I have been told that there isnt a large gain to be had when port and polishing certain Honda cylinder heads because they are pretty well done straight from the factory. Basically what i think it boils down to is the bang for the buck isnt worth it in the long run. I would still do it if I had the money around. I hope this helps. Im not very good at explaining this process. if anyone has a better explanation please continue.
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Stop looking at my Autometer! 
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#4
09-23-2002, 01:05 PM
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Quote:
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Stop looking at my Autometer!
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#5
09-23-2002, 05:13 PM
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Yea, given the circumstances of a car engine, I wouldn't think you can notice a difference between a rough tube and a smooth tube, but I bet at hi rev your pistons might be pulling a little harder through the valve to get air into the cylinder.
What makes sense to me is it would just extend the life of the entire cam/chamber assembly
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So the biblical scholars mis-translated the Hebrew word for "young woman" into the Greek word for "virgin," which was a pretty easy mistake to make, since there is only a subtle difference in the spelling. But back then it was the "virgin" that caught people's attention. It's not every day a virgin conceives and bears a son. So you keep that for a couple of hundred years, and the nexy thing you know, you have the Roman Catholic church. -Snatch
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#6
09-23-2002, 06:19 PM
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i just got my head polished not long ago, i havent put it back on yet but it looks brand new and all that carbon and crap in the tubes are gone so.....
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2002 Acura TL Type S 1991 Honda Crx Si
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#7
09-23-2002, 08:56 PM
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yea, thats the other thing, you get a higher cool looking factor with part polish
__________________
So the biblical scholars mis-translated the Hebrew word for "young woman" into the Greek word for "virgin," which was a pretty easy mistake to make, since there is only a subtle difference in the spelling. But back then it was the "virgin" that caught people's attention. It's not every day a virgin conceives and bears a son. So you keep that for a couple of hundred years, and the nexy thing you know, you have the Roman Catholic church. -Snatch
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#8
09-25-2002, 02:23 PM
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there actualy is about 20-35 hp increase depending on the application and the quality of the job and if you cant tell the difference then someone riped you off. I would recomend a good old port and polish to anyone who is serious about their car.
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#10
09-25-2002, 08:46 PM
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probaly depends on the engine size.
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98 Accord F23A1, AEM Intake,Greddy Catback Exhaust,and Greddy Header,Gude Performance Package(throttle body,Intake Manifold,camshaft, and cylinde head assembly),forged pistons,valves and valve springs,AEM Cam gears and Pulleys,Fluidyne Radiator,AEM Fuel reg and rail, Automatic Torque Biasing Differential, Unorthodox racing clutch, and Unorthodox racing flywheel, Apexi V-AFC,25 shot of ZEX
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#12
09-25-2002, 10:24 PM
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Quote:
__________________
Stop looking at my Autometer!
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#13
09-29-2002, 09:18 PM
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A standard port and polish on a single head motor should run around $1000-$1200
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#14
09-29-2002, 10:29 PM
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well I found a site that sells a head and cams and everything that is Port & Polished and it seems fine... Hers the link, tell me waht u think?
http://mmrusa.com/gudehead.htm
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#15
10-03-2002, 11:37 PM
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It is definitly worth it if you are going to do it yourself i.e. after you have gained some confidence working on and modding your car. The best reason for this is if you plan on doing some kind of forced induction like T/C or S/C. I personally like all motor better but thats just my opinion. Look at a set of Weber style individual throttle bodies. The ones for the b16's add like 125 hp for 3k. But it is all motor and no lag, or reliability probs.
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"It ain't fun if you ain't scared"! 1995 Civic w/GSR swap and stuff...... 99 Pontiac Trans Am w/ 4:11's
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