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Exhuast Ports 

 

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 Post subject: Exhuast Ports
Posted: Mon Jan 01, 2007 9:51 pm 
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Just wana know wats the biggest ppl have opened the exhuat ports to...

at them moment they are stock which is about 33mm...i want to open the up to suit my extractors which is 43mm

just dont know whether there will be enuff "meat" outside if i do open them that far as i dont want to crack them with the heat expansion...

any info would be great

 

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Posted: Mon Jan 01, 2007 9:59 pm 
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What brand of extractors do you have? Are they 43mm inside the pipe?
Usually, the std Ford exh port on 3.9/4.0, is smaller than the OE gasket anyway, approx 2-3mm smaller all round. If you take it out that far, you may risk loosing some the ability to transfer heat away from the exh port surrounding. Its only a thought.

 

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Posted: Mon Jan 01, 2007 10:00 pm 
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My exhaust ports are around 35mm. I dont see much point in going bigger.

 

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Posted: Mon Jan 01, 2007 10:06 pm 
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cjh wrote:
What brand of extractors do you have? Are they 43mm inside the pipe?
Usually, the std Ford exh port on 3.9/4.0, is smaller than the OE gasket anyway, approx 2-3mm smaller all round. If you take it out that far, you may risk loosing some the ability to transfer heat away from the exh port surrounding. Its only a thought.


yea well thats it...thats why i dont wana take too much out maybe just a couple of mm...

they are pacemakers not the comp ones

mite go and steal a flapper wheel from work and just give them a polish

 

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Posted: Mon Jan 01, 2007 10:14 pm 
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When I did mine, I used the OE tin gasket as a template, scribed a line around, then centre popped it, so to make the line clean & clear. Then used a die-grinder with an alloy burr, an egg shaped one, then use a flapper wheel, 120 grit. Take your time and be patient. as the saying goes, " all good things come to those who wait".
Good luck.

 

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Posted: Wed Jan 03, 2007 11:41 pm 
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reckon it would be of much benefit? i havent seen a Falcon head in ages, but i would have though match porting to the headers would be a bit of a waste unless you were going to do the whole port and drop in larger valves

 

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Posted: Thu Jan 04, 2007 7:23 am 
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You end up with not enough mating surface & it'll most likely cause exhaust leaks between the exhaust port & headers, if the header primaries start to warp.

 

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