1 1 2 vs 1 5 8 headers 1 1 2 vs 1 5 8 header question probably obscure I have to ask but doubt anyone has ever quantified this On a 302 how much performance difference is there between 1 1 2 and 1 5 8 diameter shorty headers
Not only that it can actually rob your engine of power Most of our techs agree that a street application 350 will benefit well from a header with 1 1 2 to 1 5 8 diameter primary tubes and 2 1 2 or 3 inch collectors What this size does is creates a faster removal of spent gas and also develops just enough backpressure for a broad torque An engine making 400 450 horsepower on a racing application that spends all its time on a drag strip between 3 500 and 6 500 RPM and a 1 5 8 tube is effective and many will suggest a 1 3 4 primary tube header However that 1 3 4 header is also compatible on applications making over 600 650 horsepower
1 1 2 vs 1 5 8 headers
1 1 2 vs 1 5 8 headers
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Sobre Tama os De Sensores De Pixeles Y Resoluci n Introducci n
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2014 2018 Corvette C7 1 7 8 Headers With Catted X Pipe Stainless
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Matt assuming that you have a full exhaust on the car as long as the rest of the exhaust isn t restrictive then IMO the size difference of a 1 5 primary tube and a 1 5 8 isn t any big deal but in your case if anything going We swapped out the 1 5 8 inch headers for 1 inch long tube headers and found additional low end power from 3 000 through 3 800 rpm with increases of roughly 4 to 6 lb ft of torque and horsepower
My question is whenever I upgrade to Trick Flow 170 heads will my 1 5 8 Ford Racing headers reduce my torque over what a set of 1 1 2 primary headers would give me Yes a 1 3 8in would be better for a 1600cc except the Sidewinder only come in 1 1 2 1 5 8in They used to make 1 3 8 Sidewinders in the 60s I had a set The smaller diameter makes a nice improvement in torque and mileage on smaller engines They recommended the 1 3 8 header and it didn t disappoint it impressed the hell out of
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For a stock and even lightly modded 3 0 headers such as SSI are going to be the best bang for the buck they have 1 1 2 OD 1 3 8 ID They are well designed fit well and can use more varieties of mufflers than most anything else out there As a cross check 500hp 8 1129 8 142 hp per header primary 2 257 x 142 115 2 76 sq inches 0r a header primary a bit larger than 1 3 4 and smaller than 2 or a 1 7 8 to maximize peak hp per header primary but keep in mind you ll spend most of your time below peak rpms so a slightly smaller 1 3 4 primary on a street strip engine that
1 5 8 will support far more than 500 hp it will simply suffer worse pumping loss When the exhaust valve cracks the flow rate is off the chart until the pressure drops It will be higher at nearly any crank position Opening With 2 Step Headers 2 000 x 10 5 2 125 x 20 5 31 5 inches 4 000 x 10 5 Collectors then with 1 625 1 5 8ths Headers with 4 000 Collector 642 0 HP 6800 RPM to 641 9 Peak HP 7000 RPM and Peak TQ 578 2 5000 RPM then add on Mufflers exhaust system
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1 1 2 vs 1 5 8 headers - The primary pipe diameter helps to set at what RPM peak torque occurs Ideally it should be matched with the peak torque of the intake For a 350 running 1 75 diameter primaries peak torque occurs at approximately 4 850 rpm For 1 5 8 1 625 primaries peak torque occurs at about 4 200 rpm