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how much power

Posted: Thu, 23 Jul 2009, 23:37
by project power
hi guys i was wondering if anyone could tell me roughly how do u work out how much power is required e.g. how powerfull does my engine neeed to be to prupell my car im looking at doing a 2000 model holden rodeo duel cab

cheers guys Image

how much power

Posted: Fri, 24 Jul 2009, 04:24
by Richo
Well there are a number of ways to work it out.
1. Imperical Testing
2. Theoretical calculations
3. Rule of thumb

Roughly speaking you will need about 20-25kW continuous to go about 100kph.
But you will need a lot more for the acceleration (peak power).
If you look at what the car had originally this will give an idea of peak power.
The coninuous power of an electric motor should generally meet the requirements if the peak power is met.

how much power

Posted: Fri, 24 Jul 2009, 17:33
by project power
okay cool down a bill mashiery theres a 100hp or 74 kw motor {i think} this in therory should be enough to prupell the ute for what i need it for its an old industrail motor its ac but i think it should do the job can you guys give me any advice on second hand eletric motors.

how much power

Posted: Fri, 24 Jul 2009, 17:38
by Johny
project power wrote:... a 100hp or 74 kw motor
How much does this motor weigh?
A lot depends on the rated speed of the motor.
If it is a 1460RPM (or thereabouts, 4 pole) then you will have to get it rewound for lower voltage which essentially raises the rated speed (at full torque).
If it's a 2960 RPM (2 pole) then it may be usable as is but you may need to retain the gearbox.

how much power

Posted: Fri, 24 Jul 2009, 17:48
by project power
hi johny the motor is a weg eletric motor 4 [pole 100hp bill has not spoke about its rpm but im going oout thaTWAY TODAY SO I CAN FIND OUT IF YOU WISH TO LOOK FOR YOURSELF THIS URL SHOULD GET U TO IThttp://www.billsmachinery.com.au/details.php?id=9894
ALSO WHAT ARE YOUR THOUGHTS ON BIULDING CARS FROM WREAKS FROM THE YARDS

how much power

Posted: Fri, 24 Jul 2009, 17:58
by Johny
project power wrote: hi johny the motor is a weg eletric motor 4 [pole 100hp bill has not spoke about its rpm but im going oout thaTWAY TODAY SO I CAN FIND OUT IF YOU WISH TO LOOK FOR YOURSELF THIS URL SHOULD GET U TO IThttp://www.billsmachinery.com.au/details.php?id=9894
According to my WEG catalogue they don't make an aluminium frame motor above 10kW so it's likely a Cast iron frame 75kW. This puts it at about 660kg - a tad heavy Image
project power wrote:ALSO WHAT ARE YOUR THOUGHTS ON BIULDING CARS FROM WREAKS FROM THE YARDS
In Victoria it's illegal to put a car back on the road once insurance has written it off (someone correct me if this is wrong). Don't know about WA.

how much power

Posted: Fri, 24 Jul 2009, 18:19
by project power
johny thank you for your help i think our laws may be different because ive seen a fare few people rebiulding wreaks dono if they where insurance wrightoffs tho the may just have been cars that got wrighten off coz there past there use buy date they look to be struturely okay just shot motors ect ill take a look at bills later today.

how much power

Posted: Fri, 24 Jul 2009, 19:13
by Taffy
You can get it registered from insurance right offs (eg a porchse with a smashed bumper) but not from "crash"- forget the term right off(eg an Astra that was T boned and chassis rails are now bent). I would get an expert view rather then just from a forum on that 1 though.

how much power

Posted: Sat, 25 Jul 2009, 01:23
by project power
cool that sounds good to me ill talke a look around and see what i can find. umm ill keep looking around salvage yards for motors in the mean time. ill look for a lighter smaller motor about 25kw continus.thanks guys

how much power

Posted: Mon, 27 Jul 2009, 17:40
by Peter C in Canberra
My motor (ADC8") is capable of more peak power (~60KW from memory) than I can get from my battery (~40KW max (product of volts and current)), and that is when it's warm. Cold (zero to 10 degrees) I am getting around 25KW max. Getting a powerful enough motor may not be the limiting factor.
Peter.

how much power

Posted: Mon, 27 Jul 2009, 18:05
by woody
Yep, I'd echo what Peter says, all components need to work together to deliver the power - from the batteries through the wiring, controller, motor, gearbox, drivetrain, tyres, driver :-)

The weakest link will limit your performance.

how much power

Posted: Tue, 28 Jul 2009, 23:21
by Richo
If you want an industrial AC motor generally you would look at sizes 11-22kW 4-pole.
Bills rarely ever get an Aluminium case motor.
A cast Iron motor will likely put your car overweight unless you plan carefully.

WA is no different for write-offs as it is national.
If you want to use one you will need to ring the licencing centres to check if the vehicle is in the register.
DPI Write-off register info

how much power

Posted: Thu, 13 Aug 2009, 21:05
by priit
If the car is Repairable Writeoff, you can repair it and have it registered again, if it is Statutory Writeoff, you can only use it for parts, but can not register it again.

how much power

Posted: Fri, 14 Aug 2009, 06:24
by Richo
Image

Yes always wise to check the register if you want to buy an unregistered vehicle.