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Old 23rd February 2005, 03:41   #1
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Exclamation Porting and Polishing!!!

Can anybody explain the process of porting and polishing.......
And the benifits.......
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Old 27th February 2005, 11:43   #2
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Default Port Polish

Hi there.......

Firstly let me tell you..........I am not an engineer !!

But porting and polishing............as far as I know is.........

The engine has a head. There is an intake manifold and an exhaust manifold.

For a 4 cylinder engine. there are 4 ports (or holes) on either side of the head.

Your intake manifold and exhaust manifold are connected to the head on these 4 ports.

In your stock car the area of the valve guide that protrudes into the intake or exhaust port is always a place where sharp edges and restriction to Air/Fuel flow are found. A basic porting project seeks to smooth those sharp edges.

A more significant point of restriction is where the intake or exhaust port floor curves down to meet the valve seat. Called the "short side radius," it is also a place where sharp edges and roughness pose a threat to flow. In this cutaway of a stock cylinder head, the short side radius has not one but two very sharp edges (in some cases)
When you say port polish the head.........what the turner does is .........he grinds the 4 holes with proper instruments (itís very minimal.....around 1-2mm) and polishes the hole. Porting increases flow of Air/fuel mixture going in and polishing improves the flow.

How much air and fuel goes in.....governs the performance of the car. Likewise and free flow header is required on the exhaust to assist this whole process.

Keeping Air/Fuel and Gas flow smooth is the key here !!

So after port polish you engine is taking in slightly more air and fuel and flowing it smoothly. Thus giving your car a 5-10% improvement in power. Believe me.........you can FEEL IT !!

Normally people even face the head......that increases compression.

My explanation might be slightly wrong.......but I hope you get a basic idea from it.

Last edited by anant_n1 : 27th February 2005 at 11:47.
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Old 27th February 2005, 12:38   #3
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thats the most direct and simple explanation i have come across...nice one!!!
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Old 27th February 2005, 12:59   #4
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Hey anant,
exellent explanation.
Are there any risks when doing such a job
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Old 27th February 2005, 21:52   #5
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It can ruin the engine if it is not done properly...so wherever you get it done...make sure the guy knows what he is doing.

Drifter
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Old 27th February 2005, 22:00   #6
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lovely explanation!!!!
can someone tell me how much does this cost? just curious!
also does this require freeflow to acompany it?
any hamper in the FE?
~cheers
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Old 27th February 2005, 22:37   #7
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Quote:
Originally Posted by anant_n1
When you say port polish the head.........what the turner does is .........he grinds the 4 holes with proper instruments (itís very minimal.....around 1-2mm) and polishes the hole. Porting increases flow of Air/fuel mixture going in and polishing improves the flow.
Great. Just to add to your note that polishing removes those casting impurities and hence cuts the obstruction for the mixture flow.

By the way, I want to see your Amby. Feel your Amby.Praise your Amby....next time I'm in Bombay.
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Old 27th February 2005, 23:33   #8
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Hi,
Porting could set you back anywhere from 3500 to 15000 in India. The higher cost jobs dont only include porting and polishing, but multi angle valve jobs, valve guide modifications, cut back of stock valves etc etc....

Cheers
Dom
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Old 1st March 2005, 10:16   #9
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How badly does porting effect your mileage and engine life? Also, who in Mumbai can do a good job?
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Old 1st March 2005, 10:18   #10
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Hi Rudra,

Thanks for all the appreciation.......I really love it when people appreciate my Amby.......lots of effort, work, time and money has gone into it. She's my baby !!

Would love to meet another amby fan !!

see you soon.

regards,
Anant

Quote:
Originally Posted by Boom Shiva
How badly does porting effect your mileage and engine life? Also, who in Mumbai can do a good job?
Hi there.........We have a turner who's good. If you wish to get work done ......please let me know............we have a price discount with him..since we do 3-4 cars a month with him.

I trust him.....does a good job....has successfully done it for us a number of times.

so pls let me know if you need any help with it.

regards,
Anant

Last edited by Dippy : 24th February 2010 at 13:37. Reason: Back to back posts. Please use the edit function if posting within 20 minutes of your earlier post.
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Old 1st March 2005, 19:50   #11
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Hi,
Is it possible for one to perform polishing by himself? Or you need a technician to do it?
During polishing, does the block need to be opened completely??!
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Old 1st March 2005, 19:58   #12
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Exclamation

Quote:
Originally Posted by anant_n1
Hi there.........We have a turner who's good. If you wish to get work done ......please let me know............we have a price discount with him..since we do 3-4 cars a month with him.

I trust him.....does a good job....has successfully done it for us a number of times.

so pls let me know if you need any help with it.

regards,
Anant
hey there ananth
can you tell me how much will porting and polishing cost for a NHC..
Can you give us the number of your tuner..
Where is he located
How much discount can we expect

Last edited by maybach : 1st March 2005 at 20:02.
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Old 1st March 2005, 20:19   #13
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Quote:
Originally Posted by Gordon
Hi,
Is it possible for one to perform polishing by himself? Or you need a technician to do it?
During polishing, does the block need to be opened completely??!
For polishing you will have to open the head and disassamble it. Please do not try to do it on the vehicle itself, do go to a professional to do it.
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Old 3rd March 2005, 04:01   #14
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Thumbs up Thanx

Anant and everyone else who contributed..... a big thank you to you'll.....now........i know!!!
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Old 4th March 2005, 21:53   #15
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Red face

guys im a newbie here can any one pls tell me how much would it cost total to modify a zen 2003 model wid a free flowing exhaust and what are its benefits? pls thanx

Last edited by hot_rod : 4th March 2005 at 21:59. Reason: wrong year
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