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 Post subject: Under drive ???
PostPosted: Thu Apr 16, 2009 4:24 am 
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Joined: Thu Apr 16, 2009 4:11 am
Posts: 1
Location: Australia
For a street driven car that may also be used for race purposes occasionally, what is the maximum the alternator can be under driven to still support the basic electrical requirements of the car ? (im talking battery charge and head lights, no big power wasters like stereos and alike).

with the standard size pullies i calculate the following:
CRANK_____WATER PUMP_____ALTERNATOR
1000rpm..........1000rpm..........2100rpm
3000rpm..........3000rpm..........6500rpm
5000rpm..........5000rpm..........10800rpm
8000rpm..........8000rpm..........17300rpm

Alternate pulley sizes (gilmer belt drive combination)
CRANK_____WATER PUMP_____ALTERNATOR
1000rpm..........780rpm..........1200rpm
3000rpm..........2300rpm..........3800rpm
5000rpm..........3900rpm..........6400rpm
8000rpm..........6200rpm..........10200rpm

would the above alternate pulley combination be viable for road use in the sense,
will the alternator be able to provide enough power at low engine rpm ?
will there be engine temp issuses with the water pump running much slower?


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