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3-Series (E36) Chat relating to the BMW 3-Series from 1992-1999. Autodoodad Specific models include: BMW 316i, BMW 318i, BMW 318iS/ti, BMW 320, BMW 323, BMW 320, BMW 324, BMW 325, BMW 328.

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Old 11-02-2004, 02:26 PM   #1 (permalink)
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When people say they're porting and polishing their engines, what is physcially done? (Increase in engine compression & performance?)why do people have this done ?
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Old 11-02-2004, 04:02 PM   #2 (permalink)
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Originally posted by kearnyme@Nov 2 2004, 02:26 PM
When people say they're porting and polishing their engines, what is physcially done? (Increase in engine compression & performance?)why do people have this done ?
[snapback]223114[/snapback]

Port and Polish DIY

This is for a chevy engine, but it gives the basics of what the proceedure is, and how to do it yourself.
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Old 11-02-2004, 04:04 PM   #3 (permalink)
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usually the intake and exhuast ports, are smoothed out to increase flow. This can be done on a CNC machine or by hand with a rotory tool. The shops I have talked to port the exhaust, but not the intake because the intake walls are to thin. Instead, they stuff titanium valves in that have a thinner stem. Effectivly the causing the same end result.

The basic rule of thumb is, the more air/fuel you stuff in the engine, the more power you make. So, allowing more air to enter the cylinder usually increases the HP. Most guys will babble about torque dropping. Though no one can ever back that statement up with dyno data. What will usually happen is torque will stay the same, maybe see a few ft-lb increase, but HP is where the gains really show.

To answer your question about compression, the answer is no. Porting the intake and exhaust has no effect on compression. However, a lot of shops will mill the bottom of the head(s) to increase the compression at the owners request.
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Old 11-02-2004, 04:10 PM   #4 (permalink)
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that's a good article. Oldschool V8 heads were always easy to port/polish because of the thicker walls. Now that the walls are getting thinner, it's becoming harder for people to do it by hand. On a M52 head, it's almost impossible to do on the intake side.
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Old 11-02-2004, 04:36 PM   #5 (permalink)
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cool guys... than ks!!
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