[Steve C.]

"At 4500RPMs the alternator averaged over the 4 tests a measily 1.28 hp loss."

http://www.carnut.com/ramblin/dyno.html


"Since the 1950s race cars ran on battery only for drag races and short duration round track races ( where magnetos we not permitted). This saves about 4.5 Horsepower on typical V8 engine. Alternators and earlier generators are notoriously inefficient. It takes about 1 HP to make 25 Amps in a perfect world. So dynometer results since the 1960s say you gain about 4.5 HP with the alternator removed."

https://www.physicsforums.com/thread...torque.693576/
Reference: https://www.physicsforums.com/thread...torque.693576/

"Spending the money on a high-quality alternator made for a racing application will save you a lot of headaches on race day."

"You want to make sure the alternator you select can charge well at idle and low RPM. Think about it: how much time do you spend with the car idling in the staging lanes and driving through the pits? That's the time you want the alternator doing its best work."

https://www.dragzine.com/tech-storie...racket-racing/


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[PAUL K]

Using round numbers we've seen five horsepower when adding a Moroso electric motor driving the water pump compared to a belt.

Twice we removed the fan and made a quarter mile pass and didn't not see anything noticeable with the time slip.

Many years ago Car Craft did a fan shoot out and one clutch fan wailed the crap out of every other fan they tried. Lots of folks ran out and bought that winning fan. Years later the Editor let the world know that the clutch was defective and never locked up causing the increase in power.

I think that was the same issue they let us know the secret about using Chapstick to keep Holley brown gaskets from sticking.

[Steve C.]

Cooling Fan Shoot-Out! - Engine Masters Ep. 20

https://www.youtube.com/watch?v=ZXdLgaFXZzs

Keep in mind the tid bit I posted in the link in post #7. From the Car Craft testing article.....

There is no common industry standard for rating electric fans. Most companies use a cfm rating, often expressed in free-flow and not when placed behind a radiator. You can never know for certain about different cfm ratings or how a company has rated their fan since they can be tested by different criteria and methods. In comparison between brands using cfm ratings alone is difficult, typically not apples-to-apples.


.

[Steve C.]

Regarding the alternator....

"Its pretty minimal. You can calculate it by knowing that 1 HP = 750 Watts. So for example, let's say that you are changing from a 60 amp alternator to a 200 amp alternator. That is a difference of 140 amps. Let's also assume your charging system is putting out 14 volts. Power in watts is equal to current (amps) multiplied by voltage. So, 140 amps X 14V = 1960 watts. 1960 divided by 750 is 2.61 HP. If your alternator is only 50% efficient, that's about a 5 HP difference. And the alternator is probably a lot more efficient than 50%. Plus, your 200 amp alternator is not putting out 200 amps all the time, it is only delivering that amperage when it is required."

Source if interested:

http://fepower.net/simplemachinesfor...&topic=4879.15



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[slowbird]

Originally Posted by PAUL K

Using round numbers we've seen five horsepower when adding a Moroso electric motor driving the water pump compared to a belt.

Twice we removed the fan and made a quarter mile pass and didn't not see anything noticeable with the time slip.

Many years ago Car Craft did a fan shoot out and one clutch fan wailed the crap out of every other fan they tried. Lots of folks ran out and bought that winning fan. Years later the Editor let the world know that the clutch was defective and never locked up causing the increase in power.

I think that was the same issue they let us know the secret about using Chapstick to keep Holley brown gaskets from sticking.

Twice you removed the fan? What type of fan?

[PAUL K]

Originally Posted by slowbird

Twice you removed the fan? What type of fan?

Two different outings. Clutch fan one time and I can't remember for sure the second time but pretty sure it was a clutch fan also.

[slowbird]

Originally Posted by PAUL K

Two different outings. Clutch fan one time and I can't remember for sure the second time but pretty sure it was a clutch fan also.

That's interesting that you saw no difference.
I remember my dad having issues throwing belts on the Firebird one time, it would throw the belt probably somewhere between the 330 and 660, with the belt it ran mid 12.6 when it threw the belt it picked up a tenth to mid 12.5s. I know that the water stopped also but I'd think the fan would be worth more than the pump?? Maybe not?

[PAUL K]

Originally Posted by slowbird

That's interesting that you saw no difference.
I remember my dad having issues throwing belts on the Firebird one time, it would throw the belt probably somewhere between the 330 and 660, with the belt it ran mid 12.6 when it threw the belt it picked up a tenth to mid 12.5s. I know that the water stopped also but I'd think the fan would be worth more than the pump?? Maybe not?

Was the PS pump belt still turning? Maybe it helps more on a low horsepower combo .... It would be a larger increase in power percentage wise.

[slowbird]

Originally Posted by PAUL K

Was the PS pump belt still turning? Maybe it helps more on a low horsepower combo .... It would be a larger increase in power percentage wise.

No he always took the power steering belts off to race, that was .06-.07 itself I believe.