Re:Hi-power alternator needed for BEC

[Mike A Veal-175]

Porsche,
I'll start by saying that I am not a ZX10 expert. I know absolutely
nothing about them.

I don't know where you'll get an upgrade for the ZX10 alternator (and
regulator). You might get away with upgrading the regulator alone, or even
fitting a heatsink to the regulator to allow it so ship more juice.
However, you may well be drawing too much current, if you upgrade the
regulator alone, you might find that you just burn out the alternator.

I know that my R1 alternator is good for 26A. The figure for the ZX10
ought to be listed in the service manual.

You appear to be running 4 headlights, assuming they are 55W each, that's
220W or 18.3A.
Your fuel (injection?) pump could be taking anywhere between 5 and 10A.
Let's call ECU, ignition, guages and all the sundries 5A - that's
generously low.

So you're at around 33A before you add in the fan and a little something
to charge the battery.

You might be able to squeeze an extra amp or two out of the current
alternator, but I think you're probably well past this.

The alternative to beefing up the alternator is to conserve power on the
electricals.

The big hitters are:

1. Headlights. Replace the bulbs with Xenon HID's. Drop from 55W each to
35W each, saving 6.7A in total (4 headlights).

2. Fan. Take a second look at your choice of fan. If you have something
designed for a car, it could easily be taking 12A. Go back to the
motorcycle, or fit something weedier. Kenlow make a 6" fan that draws
around 4A.

3. Fuel pump. I got mine from fse. They used to have charts on their
website listing pressure, flow and current draw of the pump. The charts
are gone, but they'll probably help if you call, you'll need to know fuel
rail pressure and max Bhp. I was able to find a Bosch pump that drew 4A.
The majority of pumps around were drawing 7 to 10A.


Hope that helps a bit.


Mike Veal






Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU







[Non-text portions of this message have been removed]

[Porsche Waddell-122]

thanks for this mike .. good ideas!




________________________________
From: Mike A Veal <vealmic@...>
To: bike-engined-cars@...
Sent: Wed, 4 November, 2009 16:47:45
Subject: [bike-engined-cars] Re:Hi-power alternator needed for BEC

 
Porsche,
I'll start by saying that I am not a ZX10 expert. I know absolutely
nothing about them.

I don't know where you'll get an upgrade for the ZX10 alternator (and
regulator). You might get away with upgrading the regulator alone, or even
fitting a heatsink to the regulator to allow it so ship more juice.
However, you may well be drawing too much current, if you upgrade the
regulator alone, you might find that you just burn out the alternator.

I know that my R1 alternator is good for 26A. The figure for the ZX10
ought to be listed in the service manual.

You appear to be running 4 headlights, assuming they are 55W each, that's
220W or 18.3A.
Your fuel (injection?) pump could be taking anywhere between 5 and 10A.
Let's call ECU, ignition, guages and all the sundries 5A - that's
generously low.

So you're at around 33A before you add in the fan and a little something
to charge the battery.

You might be able to squeeze an extra amp or two out of the current
alternator, but I think you're probably well past this.

The alternative to beefing up the alternator is to conserve power on the
electricals.

The big hitters are:

1. Headlights. Replace the bulbs with Xenon HID's. Drop from 55W each to
35W each, saving 6.7A in total (4 headlights).

2. Fan. Take a second look at your choice of fan. If you have something
designed for a car, it could easily be taking 12A. Go back to the
motorcycle, or fit something weedier. Kenlow make a 6" fan that draws
around 4A.

3. Fuel pump. I got mine from fse. They used to have charts on their
website listing pressure, flow and current draw of the pump. The charts
are gone, but they'll probably help if you call, you'll need to know fuel
rail pressure and max Bhp. I was able to find a Bosch pump that drew 4A.
The majority of pumps around were drawing 7 to 10A.

Hope that helps a bit.

Mike Veal

Unless stated otherwise above:
IBM United Kingdom Limited - Registered in England and Wales with number
741598.
Registered office: PO Box 41, North Harbour, Portsmouth, Hampshire PO6 3AU

[Non-text portions of this message have been removed]





     

[Non-text portions of this message have been removed]