Comments on: Electric Superchargers – Emperical Proof. http://www.superchargerperformance.com/aftermarket-supercharger-performance/electric-superchargers-imperical-proof Supercharger performance news and home of the supercharger calculator Tue, 11 May 2010 21:56:42 -0500 http://wordpress.org/?v=abc hourly 1 By: admin http://www.superchargerperformance.com/aftermarket-supercharger-performance/electric-superchargers-imperical-proof/comment-page-1#comment-31 admin Wed, 30 Sep 2009 23:21:44 +0000 http://www.superchargerperformance.com/?p=731#comment-31 Case in point : http://www.treehugger.com/files/2009/09/electric-supercharger-hybrid-boosts-torque-better-mpg.php axial fans have very low 'block off' pressure. they can't really trap air so they can't really create boost. Turbines are a little different, due to a much higher RPM and multiple layers of 'fans' to create block of. An electric supercharger is going to almost definately be some sort of air trapping device be that centrifugal (airflow outlet is 90* to the inlet) or some sort of positive displacement pump (pumped air has no way to flow back).... and even then u need a lot of current. The link posted above is promising but it caps out at 70,000 rpms (of a turbine's possible ~120,000 rpms) and at ~7psi of boost instead of 15+ and that specfic unit if u scrutinize the dyno graphs provided i estimate to be flow limited to 140hp @ 7psi. So i can see one of these on a bike... say a Yamaha R6... and that was probably going to be my next blog post :) Thanks for reading Case in point :

http://www.treehugger.com/files/2009/09/electric-supercharger-hybrid-boosts-torque-better-mpg.php

axial fans have very low ‘block off’ pressure. they can’t really trap air so they can’t really create boost.
Turbines are a little different, due to a much higher rpm and multiple layers of ‘fans’ to create block of.

An electric supercharger is going to almost definately be some sort of air trapping device be that centrifugal (airflow outlet is 90* to the inlet) or some sort of positive displacement pump (pumped air has no way to flow back)…. and even then u need a lot of current.

The link posted above is promising but it caps out at 70,000 rpms (of a turbine’s possible ~120,000 rpms) and at ~7psi of boost instead of 15+ and that specfic unit if u scrutinize the dyno graphs provided i estimate to be flow limited to 140hp @ 7psi.

So i can see one of these on a bike… say a Yamaha R6… and that was probably going to be my next blog post :)

Thanks for reading

]]> By: Brent http://www.superchargerperformance.com/aftermarket-supercharger-performance/electric-superchargers-imperical-proof/comment-page-1#comment-30 Brent Wed, 30 Sep 2009 19:50:07 +0000 http://www.superchargerperformance.com/?p=731#comment-30 This isn't to say an electrical supercharger COULDN'T exist, just that the $20 dollar ebay specials aren't good enough. In fact I think some auto manufacturers looked at the idea of E-superchargers in conjunction with moving cars up to 48V electrical systems. However, the 48V idea got canned, and so did a true e-supercharger. This isn’t to say an electrical supercharger COULDN’T exist, just that the $20 dollar ebay specials aren’t good enough.

In fact I think some auto manufacturers looked at the idea of E-superchargers in conjunction with moving cars up to 48V electrical systems. However, the 48V idea got canned, and so did a true e-supercharger.

]]> By: Wesley HS http://www.superchargerperformance.com/aftermarket-supercharger-performance/electric-superchargers-imperical-proof/comment-page-1#comment-159 Wesley HS Wed, 31 Dec 1969 18:00:00 +0000 http://www.superchargerperformance.com/?p=731#comment-159 Wesley HS wrote: I know you are allowing comments to your article "Electric Superchargers – Emperical Proof. July 6th, 2009" - However while that article debunks the axial fan electic superchargers, there are several companies that have developed working electric superchargers. I happen to have 2 examples - both based on converted Eaton Superchargers - a m62 and m90. They are ESC units from Thomas Knight over at http://www.boosthead.com/home.php I have used some of his other superchargers as well - the BDT units. Further - his units have been installed on a host of vehicles, are proven to work both electric and non-electric and he holds a few patents. The most tantalizing evidence can be found at: http://www.turbomagazine.com/tech/0406tur_knight_turbo_electric_supercharger/index.html Which is turbo magazines right up on his old altima. There are of course a few other companies that have designed and built various units. But I have yet to see one that doesnt in some way infringe on his patents. He has both centrifugal and roots style units - I have played with both, all I will say is they are impressive. Their limitation is the amount of power they consume, which limits maximum continous opperation. I suspect you may have come across them in the past. The important thing I think is to distinguish the difference between a bilge pump or rc airplane motor in a plastic tube and a true electric supercharger. Also - a take not of one thing - a cheap boost gauge typically lacks the sensitivity or range to detect smaller changes in manifold pressure. Every OEM intake system for an ICE I have ever seen. Is operating at a slight negative - in the range of 1/2 a point of boost do to restrictions and the nature of its design and optimiazation for a given rpm range. Pressurizing the intake stream, can even if of a limited range - make a difference as you have erased the negative pressure - which is a possitive pressure gain - but marginal at best - but still a gain. Of course to explore that you would have to get into flow dynamics, intake velocity and optimization, etc. Wesley HS wrote:
I know you are allowing comments to your article “Electric Superchargers
– Emperical Proof.
July 6th, 2009″ – However while that article debunks the axial fan
electic superchargers, there are several companies that have developed working
electric superchargers. I happen to have 2 examples – both based on converted
eaton Superchargers – a m62 and m90. They are ESC units from Thomas Knight over
at http://www.boosthead.com/home.php

I have used some of his other superchargers as well – the BDT units.

Further – his units have been installed on a host of vehicles, are proven to
work both electric and non-electric and he holds a few patents.

The most tantalizing evidence can be found at:
http://www.turbomagazine.com/tech/0406tur_knight_turbo_electric_supercharger/index.html

Which is turbo magazines right up on his old altima.

There are of course a few other companies that have designed and built various
units. But I have yet to see one that doesnt in some way infringe on his
patents.

He has both centrifugal and roots style units – I have played with both, all I
will say is they are impressive.

Their limitation is the amount of power they consume, which limits maximum
continous opperation.

I suspect you may have come across them in the past. The important thing I
think is to distinguish the difference between a bilge pump or rc airplane motor
in a plastic tube and a true electric supercharger.

Also – a take not of one thing – a cheap boost gauge typically lacks the
sensitivity or range to detect smaller changes in manifold pressure.

Every OEM intake system for an ICE I have ever seen. Is operating at a slight
negative – in the range of 1/2 a point of boost do to restrictions and the
nature of its design and optimiazation for a given rpm range. Pressurizing the
intake stream, can even if of a limited range – make a difference as you have
erased the negative pressure – which is a possitive pressure gain – but marginal
at best – but still a gain. Of course to explore that you would have to get into
flow dynamics, intake velocity and optimization, etc.

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