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38mm O/D extarctor primary, I/D size. 

 

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 Post subject: 38mm O/D extarctor primary, I/D size.
Posted: Thu Oct 22, 2009 10:39 pm 
Getting Side Ways
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Ride: EF Fairmont Station Wagon.

Power: 150 rwkw

Location: Mandurah
WA, Australia

Any one know how thick the walls on extractor primary pipes are, I know they will vary but I am thinking 1.0mm to 1.2mm.

 

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4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
Home port job. 1636 Wade cam. Wildcat Extractors, 2 1/2" cat and exhaust.
2200/2400rpm Dominator More Stall. Stage two mechanical shift kit. 3.73 4 pinion LSD. 15.078 @ 92mph.

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 Post subject: Re: 38mm O/D extarctor primary, I/D size.
Posted: Mon Oct 26, 2009 8:02 pm 
Getting Side Ways
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More than likely they would be 1.6mm WT. Unless it's cheap crap, and it would be anybody's guess as to the thickness.............

Cheers

8-) Daz 8-)

 

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 Post subject: Re: 38mm O/D extarctor primary, I/D size.
Posted: Mon Oct 26, 2009 11:31 pm 
Getting Side Ways
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Age: 50

Posts: 480

Joined: 10th Feb 2005

Gallery: 28 images

Ride: EF Fairmont Station Wagon.

Power: 150 rwkw

Location: Mandurah
WA, Australia

Thanks Daz, I have been looking at extractor primary pipe size in relation to the valve throat size, I have had my exhaust port/valve throat machined to 34.80mm which is 85% of the 40.90mm exhaust valve. There is a general consensus (among others) that the primary pipe I/D should be the same as the valve throat, this is to maintain exhaust gas velocity aiding in scavenging, My extractor primaries are 38mm O/D less 3.2mm makes 34.80mm I/D so fluked that one because I've had the extractors way before doing the head work. Thanks, another small piece of the puzzle sorted.

 

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4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
Home port job. 1636 Wade cam. Wildcat Extractors, 2 1/2" cat and exhaust.
2200/2400rpm Dominator More Stall. Stage two mechanical shift kit. 3.73 4 pinion LSD. 15.078 @ 92mph.

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