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Electric motor power ?

To: shop-talk@autox.team.net
Subject: Electric motor power ?
From: Paul Humphries <paul.humphries1@virgin.net>
Date: Wed, 18 Jul 2001 09:22:04 +0100
I hope someone an advise me.
I want to build a small electric vehicle out of a French Microcar.
Have a look at -
http://members.theglobe.com/erichall/rec.html?nfhp=981169164&rld=343019484

for the, red, vehicle
I'm the fat b*****d filling my 1956 Austin A35 up with fuel from a can.
The white car is good all round and the red car was free as a spares
vehicle (mechanically they are the same). Despite the appearance, it's
simply very dirty / dull paint work, the fibreglass body is perfect as
is the tubular chassis. It's the red car that I want to make electric
power.
The original engine is a 125cc Montessa two stroke unit (gearbox sawn
off !!!) with power to the wheels via a rubber drive belt on variomatic
pulley's to a diff unit / forward / neutral / reverse gearbox.
Electric vehilces are very rare in the UK and useable motors extremely
expensive. I therefore intend importing one from the States.
I get confused when looking at electric motors as to how the power,
rated in HP, relates to what I normally look at in petrol motors BHP. 
One electric motor that I am considering is only rated at 1.2 HP which,
to me, seems tiny but I am told it will replace the existing 125cc two
stroke easilly.
Can anyone give me any help in determining what HP an electric motor
should be to replace a petrol engine. I assume there is no HP to BHP
conversion tables due to the difference in how the rating is calculated. 
Thanks.

Paul Humphries,
Stoke-on-Trent,
Staffs.,
UK.

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