You might well be right as those figures don't take into account any loses. It's really just a straight conversion from amps to watts then to HP (745.7 watts =1hp) . It won't be much more than that though.
Using a really modern alternator would be difficult as they are all ECU controlled now for fuel efficiency. Things like they charge less on acceleration and more on coasting/overrun. Even the 4.0 4.6 rovers had large alternators though, all the serp belt ones basically. They were 110A if I remember right. Not sure if you could drive a large alternator effectively without a serp belt right enough.
I have a self contained 100 amp unit on my SD1 EFI driven off the v belt. It's a Marelli A127 type with integral fan. More or less a direct replacement with an extra spacer to one of the original brackets. I do have a turnbuckle for adjustment as the original was a right fiddle to set.
Dave
London SW
Rover SD1 VDP EFI
MegaSquirt2 V3
EDIS8
Tech Edge 2Y
When the alternator on my P6 packed up I had it rewound to deliver higher amperage. I can't remember how many it delivers, but it was significantly more than standard.
Any decent rewinding place would be able to wind it to deliver higher amps.
katanaman wrote:You might well be right as those figures don't take into account any loses. It's really just a straight conversion from amps to watts then to HP (745.7 watts =1hp) . It won't be much more than that though.
Using a really modern alternator would be difficult as they are all ECU controlled now for fuel efficiency. Things like they charge less on acceleration and more on coasting/overrun. Even the 4.0 4.6 rovers had large alternators though, all the serp belt ones basically. They were 110A if I remember right. Not sure if you could drive a large alternator effectively without a serp belt right enough.
Hi Marki
In the old days they used to recon they could power 5hp through a standard V Belt
Things like Lawnmowers with a Brigs & Strattern 4.5 hp motor through a V belt working hard on thick grass held up for ages
Ian
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.
katanaman wrote:You might well be right as those figures don't take into account any loses. It's really just a straight conversion from amps to watts then to HP (745.7 watts =1hp) . It won't be much more than that though.
Using a really modern alternator would be difficult as they are all ECU controlled now for fuel efficiency. Things like they charge less on acceleration and more on coasting/overrun. Even the 4.0 4.6 rovers had large alternators though, all the serp belt ones basically. They were 110A if I remember right. Not sure if you could drive a large alternator effectively without a serp belt right enough.
Hi Marki
In the old days they used to recon they could power 5hp through a standard V Belt
Things like Lawnmowers with a Brigs & Strattern 4.5 hp motor through a V belt working hard on thick grass held up for ages
Ian
Perhaps, but a lawnmower wont see the same rpm's and change of rpm's than a car belt will.
Owner of an "On the Road" GT40 Replica by DAX powered by 3.9Hotwre Efi, worked over by DJ Motors. EFi Working but still does some kangaroo at low revs (Damn the speed limits) In to paint shop 18/03/08.
I agree there will be losses but 4-5 HP? That would mean your your using 2.5-3.5 to get 1.5 worth of power. I really doubt that, even a screw supercharger isn't that inefficient and they are fairly poor.
Anyway we better get back on topic before Tony breaks out the big sticks