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12V accessory motor?

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YUPOK

Proven Member
397
29
Aug 13, 2013
Riverdale, New_Jersey
One of the oldest tricks in the book is to try and get as many accessories off the crank pulley as possible to help free up horsepower. A couple ways to do this is either eliminate or replace with an electric motor. Our cars have the electric fans which is a big plus.

What I'm looking for is a 12V motor I can fabricate a pulley and bracket to and run my water pump, alt. and power steering. My car is a DD and is a 13 second car at best so this would be a great project to free up horsepower without losing driveability. One other good thing is that if the car shuts off on me I can still steer it cause the motor will still be spinning the power steering pump.

So anybody know where I can get a 12V motor for this project? Something that can spin around 2500 rpm and take the load and heat of the car?
 
There are a lot more factors to consider when attempting a project like this. Load on the power steering system is going to be very different at 2500 rpm than say 7000. Having a static speed motor would not be advisable, especially for the water pump.
 
fabricate a pulley and bracket to and run my water pump, alt. and power steering

So you are going to have an electric motor spin an alternator which charges a battery that the electric motor runs off? :confused:
 
This idea is still very flawed, but that's what planning is for. As said above you really can't remove the alt from the engine.

As far as power steering, electric power steering already exists. Porsche uses it and buschur racing sells a kit to use it in an Evo.
 
What we always do is take the alternator and relocate it to run a belt of the driveshaft after the tranny to free up room and less load on the motor. Also run a electric water pump from Summit racing, as for the power steering you could run a electric pump of a S2000. If you do something like that you will still have charging at speed to run your electrical equipment, because like mentioned earlier you are defying the laws of physics with running a motor to charge a battery to run a motor.(did I do that right??)
 
Honestly, the entire premise is flawed. If you want to add horsepower and maintain drive-ability, converting to electric pumps is not the answer. Cars that do this are trying to squeeze every last drop of power out of a motor, not just free up 8hp. The cost to power ratio would be insane. If you just want more HP and maintain driveability, maybe add some boost and fuel. A 13 second car is nowhere near the point an electric water pump is needed.
 
Thanks for the good advice guys, and the criticism. Sometimes I come to this site to just throw ideas out there regardless of cost to power ratios and for me, I want to see how fast I can make the car without doing much else to the engine, that's just how I've always built my cars. They may not be a 9 second car but when I blow by someone who has a ton of engine work and they ask what I have done to it I can honestly tell them it's stock. I like that kind of challenge, how fast can you get your stocker to go, that's what's great about DSM Tuners.

As far as the alternator goes, some of the stripped down GM's I used to race didn't even have an alternator in the car, we just ran the car off the battery, and when we got back from the pits just hooked it up to a charger. My guess is our cars would not be happy without the alternator. However, I disagree that you can't run a motor to drive your alternator to power the car. The alternator just needs to spin, the battery has enough umph to get it moving initially just like the starter, the car and accessories run off the battery not the alternator, and at a certain RPM the alternator begins to hit a limit of charge where it needs to be regulated (internal regulator). Ever run your car with a bad regulator? It will work fine at idle but when you hit the gas all the light bulbs blow out. So it is entirely possible to run the car off an electric motor and still work fine, your simply replacing the engine from turning the pulley with a motor just like an accessory. As long as the alternator spins at the right RPM it can maintain the charging capability the car needs. It would have to spin a lot more than what I said at 2500 RPM though, you would have to calculate the pulley diameter difference to get the optimum RPM.

See ya'll at the track.
 
I disagree that you can't run a motor to drive your alternator to power the car.

It would be constantly draining the battery. It would be the same as just having no alt and running an electric water and PS pump it would free up some HP until the battery died. You could do and electric water pump an go with manual steering and maybe run an under drive pulley to the alt.
 
Since trying to explain how it works didn't work, do this one test for us.

On a work bench take a fully charged battery and hook a electric motor to it to run the alternator so that you can charge that same battery, se how long it takes for the battery to die(in your mind it will run forever).

Now take the same fully charged battery and run that same electric motor without the alternator and see how long the battery will last that way.

Post back with results.
 
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