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Old 01-11-2017, 12:20 AM   #1 (permalink)
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roots blower instead of butterfly valve

Let the intake vacuum do work on the roots blower.

My brother's car is 2L, 60mph is 2600 rpm.

That would be about 73 cfm at wide open throttle, actual engine intake is 17 inHg cruising.

my math is a bit fuzzy but it looks like maybe 2 hp theoretical is available.

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Old 01-11-2017, 01:29 AM   #2 (permalink)
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Yeah 4cyl gasoline engine cars typically lose about 2hp to isobaric losses.
Easiest way to fix that is get a diesel engine.
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Old 01-11-2017, 01:46 AM   #3 (permalink)
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Yes, you will probably gain efficiency with a roots blower anyway. On a 2L engine I recommend an SC12 from Toyota, it's clutched like an A/C compressor, so you can even toggle it on and off at will.

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Old 01-11-2017, 05:12 AM   #4 (permalink)
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This has been invented many times.

My version first heated the air by extracting heat from the exhaust system, used a turbine to produce power, and finally cooled the air again before it went into the engine.

2016: 128.75L for 1875.00km => 6.87L/100km (34.3MPG US)
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Old 01-11-2017, 05:20 AM   #5 (permalink)
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Will someone please explain... any single part of this? Thanks!
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Old 01-11-2017, 09:40 AM   #6 (permalink)
...beats walking...
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It takes POWER to suck air through/past a partially open orifice (throttle).

2014 Toyota Prius 1.8L eCVT
2009 Pontiac Vibe 1.8L/SFI 4A
2004 Pontiac Vibe 1.8L/MFI 4A

2011 Chevrolet LTZ Cruze 1.4LT 6A
1971 Dodge Charger 318 3A
1970 Plymouth AAR 'Cuda 340/6BBL 4M
1968 Dodge Charger 383 3A
1967 Plymouth Barracuda Formula S 383 4M
1965 Plymouth Barracuda Formula S 273 4M
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