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Old 03-13-2018, 02:19 PM   #21 (permalink)
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Originally Posted by Ecky View Post
I'm under the impression you'd get more power increase from an e-supercharger but in terms of total efficiency, it would be less than a straight e-assist.
I bet you are right. And an eAssist would be easier, if we go back to thinking just about practical EM bolt-on ideas. I have two vacant spots on my crank pulley from the delete of AC and PS. I could leave the stock alternator in place and add a small electric motor. The belts are prolly smaller than ideal but hopefully still useful with a properly small motor. That motor could maybe propel me around parking lots or extend glides. But that's not really the topic of this daydream concept general efficiency discussion.

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Old 03-13-2018, 02:21 PM   #22 (permalink)
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Originally Posted by California98Civic View Post
I bet you are right. And an eAssist would be easier, if we go back to thinking just about practical EM bolt-on ideas. I have two vacant spots on my crank pulley from the delete of AC and PS. I could leave the stock alternator in place and add a small electric motor. The belts are prolly smaller than ideal but hopefully still useful with a properly small motor. That motor could maybe propel me around parking lots or extend glides. But that's not really the topic of this daydream concept general efficiency discussion.
As a bolt-on solution for e-assist, you might choose to change the cam timing so it functions in the Atkinson cycle. A net gain in thermodynamic efficiency, increased engine load, and you still maintain adequate power down low. I could see a huge gain here for relatively little cost.

Last edited by Ecky; 03-13-2018 at 02:40 PM..
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Old 03-21-2018, 04:38 PM   #23 (permalink)
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Audi should be coming out with theirs this year. And ford will here in a bit as well. Basically the entire goal of echargers is to spool up faster to mimick a larger engine and allow a smaller engine to save on fuel (similar to how a hybrid uses its electric motors to allow a smaller engine).
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Old 08-05-2018, 03:11 AM   #24 (permalink)
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https://youtu.be/G8XT00GpKuE

This guy is doing experiments.
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Old 08-05-2018, 09:58 AM   #25 (permalink)
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Originally Posted by teoman View Post
https://youtu.be/G8XT00GpKuE

This guy is doing experiments.
There is the highly impractical again. He never really gets all that much boost for at the power he is consuming.
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Old 08-05-2018, 11:42 AM   #26 (permalink)
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Too big a compressor wheel.

The Thomas Knight kit made 10 psi.
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Old 08-05-2018, 12:08 PM   #27 (permalink)
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To be fair, there are still energy losses associated. Intercoolers exist for that reason. They add exhaust restriction and there's also added friction, but I imagine it to be a net gain.
The losses associated with todays turbos is very little at lower boost. On my last setup the turbo improved the engine efficiency of my engine a ton, but to improve FE I had to run it in lean burn do to air mass increasing.


I still think you can use a turbo compound system on a downside engine like I did on my 2.0L. and be more efficient then an electric assist setup?

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