LBPB1@aol.com wrote:
>
> Ok guys......I know I started all this and I dont mean to stir the
> pot any more,
Why don't I believe you ;)
> but I just talked to the man who I quoted as saying that the
> switch from mech. fan to electrical was worth about 12 HP. He also is the one
> who told me that switching the alternator on and off or moving it to be
> powered from the drive shaft was worth about the same HP.
Please stop baiting the nice people on this list.
> Now I dont know much about calculus and my engeniering experience is
> confined to my garage or back yard. One of you guys said that the only way to
> tell if this was true was to put the motor on a dyno and that "seat of the
> pants" testing was a poor test. Well he did dyno the motor......so his numbers
> were not just off the top of his head.
> Of course the motor tested was a competition motor and most of the
> gains were in the higher rpm range I think, but I still imagine that there
> could be something to gain from the fan change.
You shouldn't still be imagining it after the response you have
received. You SHOULD have a very clear concept on what exactly the
gains are. If you didn't listen to the answers then I don't know what
more to say.
> Building the brackets and a pully to power the alternator off the
> drive shaft is a bit much for street applications I think.
Ok, so you are interested in horsepower gains only while the car is
stopped I guess. That'll work great with your new electric fan.
> And I dont know of
> many cars that you need to put on jack stands to change the alternator or
> tighten the belt! He said that by moving the alternator aft of the
> transmission you salvage HP that would be lost anyway instead of pulling HP
> from the motor directly.
Well, he is correct there. It's worth 8 HP regardless of the
application.
> It also helps the front to rear power distribution.
This is also true, by reducing eddy currents in the chassis you can
realize a 1/2 second reduction in ETs AND better mileage. It's like
having built in fuel line magnets.
> Still only minor points when it comes to street cars.
> All this discussion has been very very interesting and I wish that
> my friend was on line because I know he would enjoy it, but he only uses his
> computer for CADing the suspensions and chassis he builds and other race car
> stuff.
> Thanks to all those who resopnded. Ill be careful of the topics I
> raise in the future! :-)
What about the present?
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