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GEN 1 (2010-2014) Ford SVT Raptor Forums
Ford Raptor Engine Discussion and Performance Mods
6.2L Engine developement
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<blockquote data-quote="EricM" data-source="post: 1356694" data-attributes="member: 20286"><p>In my opinion, yes. The stock displacement bottom end will take more abuse and live longer.</p><p></p><p>I'd like to hear what Cody thinks about it.</p><p></p><p>What compressor you choose really comes down to much much power you plan to make. You want the compressor to operate at the sweet spot of it's efficiency. Since the compressor efficiency maps are held close to the vest, it's not an easy choice. Bigger is usually not a bad choice, assuming you don't go massively oversized. A 2.7L blower would be just fine on a 6.2L engine.</p><p></p><p></p><p>Dragged out the old links from the 03 Cobra stuff-</p><p>Here's a calculator put together for the 2003 Cobra guys, but it'll work fine for you as well. You can use this to properly size your MAF, TB, injectors, etc.</p><p><a href="https://www.modularfords.com/threads/64994-Volumetric-and-mass-air-flow-rate-calculator-for-a-4-stroke-IC-engine" target="_blank">https://www.modularfords.com/threads/64994-Volumetric-and-mass-air-flow-rate-calculator-for-a-4-stroke-IC-engine</a></p><p></p><p>Put in 378 CID instead of 281 and look at the boost level you plan to run. That'll tell you how many CFM is going into the engine. So at 10 lbs of boost, the blower is cramming 1000 CFM into the engine at 6000 RPMs. You want a TB is is designed to flow at least 1000 CFM, a MAF that can measure that with some headroom etc... It's not exact, but close enough for sizing those things.</p><p></p><p>Here's the technical explanation behind "nothing after the blower really matters"</p><p><a href="https://www.modularfords.com/threads/41735-Effectiveness-of-Engine-VE-Changes-with-a-Positive-Displacement-Supercharger" target="_blank">https://www.modularfords.com/threads/41735-Effectiveness-of-Engine-VE-Changes-with-a-Positive-Displacement-Supercharger</a></p></blockquote><p></p>
[QUOTE="EricM, post: 1356694, member: 20286"] In my opinion, yes. The stock displacement bottom end will take more abuse and live longer. I'd like to hear what Cody thinks about it. What compressor you choose really comes down to much much power you plan to make. You want the compressor to operate at the sweet spot of it's efficiency. Since the compressor efficiency maps are held close to the vest, it's not an easy choice. Bigger is usually not a bad choice, assuming you don't go massively oversized. A 2.7L blower would be just fine on a 6.2L engine. Dragged out the old links from the 03 Cobra stuff- Here's a calculator put together for the 2003 Cobra guys, but it'll work fine for you as well. You can use this to properly size your MAF, TB, injectors, etc. [URL]https://www.modularfords.com/threads/64994-Volumetric-and-mass-air-flow-rate-calculator-for-a-4-stroke-IC-engine[/URL] Put in 378 CID instead of 281 and look at the boost level you plan to run. That'll tell you how many CFM is going into the engine. So at 10 lbs of boost, the blower is cramming 1000 CFM into the engine at 6000 RPMs. You want a TB is is designed to flow at least 1000 CFM, a MAF that can measure that with some headroom etc... It's not exact, but close enough for sizing those things. Here's the technical explanation behind "nothing after the blower really matters" [URL]https://www.modularfords.com/threads/41735-Effectiveness-of-Engine-VE-Changes-with-a-Positive-Displacement-Supercharger[/URL] [/QUOTE]
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