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| WagonDad |
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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.
_________________ 4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
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| DA22LE |
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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  Daz
_________________ BA XR8 Boss 260 |
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| WagonDad |
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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.
_________________ 4.0L EF Fairmont Station Wagon. EL GT Snorkel. K&N Pod in air box. 3" Intake piping.
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