HOME FORUM RULES CONTACT
     
   
   

Go Back   CLASS RACER FORUM > Class Racer Forums > Stock and Super Stock Tech


Reply
 
Thread Tools Display Modes
Old 07-20-2018, 12:52 AM   #21
Coleydog
Senior Member
 
Join Date: Jul 2014
Posts: 557
Likes: 29
Liked 46 Times in 31 Posts
Default Re: alternator

Quote:
Originally Posted by Ed Wright View Post
It was my old '56 Chevy Jr Stocker. 265". Only belt also ran the water pump. Had points, Condenser, and a conventional coil. If MSD existed back then (1964/1967) I had not heard of them. Never spun it much past 6K, it was a solid lifter Corvette engine combo, but we had to use stock valve spring specs. Nothing like we use today.
Hmm, more to think about then. I guess the next train of thought would be the more engine hp the less hp loss. I know my 64 Savoy with a 440 never had any different ET on or off, (small crank pully and big pully on the alt). As far as consistency, I ran 7.59 with a 1 or 2 all day, alt on, just a bracket car.
By the way, loved Jr Stockers back then.
Mike
Coleydog is offline   Reply With Quote
Old 07-21-2018, 05:33 AM   #22
SGSST109E
Member
 
Join Date: Jun 2007
Location: NJ
Posts: 342
Likes: 54
Liked 124 Times in 58 Posts
Default Re: alternator

Powermaster makes a single wire alternator with and adjustable regulator. I run mine at 15volts, not enough to hurt the battery because its not running that long. If I remember correctly 750 watts equal one HP. So a 100 amp alt. at 12 volts is 1,200 watts less then two HP.
SGSST109E is online now   Reply With Quote
Old 07-21-2018, 08:08 AM   #23
Ed Wright
Veteran Member
 
Ed Wright's Avatar
 
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
Likes: 896
Liked 389 Times in 168 Posts
Default Re: alternator

Quote:
Originally Posted by SGSST109E View Post
Powermaster makes a single wire alternator with and adjustable regulator. I run mine at 15volts, not enough to hurt the battery because its not running that long. If I remember correctly 750 watts equal one HP. So a 100 amp alt. at 12 volts is 1,200 watts less then two HP.
Not disputing your math, but turn that alternator on & off the engine, sitting there running, certainly would speed up & slow down as the alternator was turned off & on.
ET slips certainly showed more than I would expect from 2 hp.
__________________
Ed Wright 4156 SS/JA
Ed Wright is offline   Reply With Quote
Old 07-24-2018, 12:23 PM   #24
Eman
Member
 
Join Date: May 2014
Location: E TN
Posts: 435
Likes: 14
Liked 100 Times in 57 Posts
Default Re: alternator

On the one wire alt. if your battery is in the back how are you wiring it? I run a powermaster one wire, been on the car for almost 20 years and had to replace the regulator once. I've spoken to Powermaster,Mechman and East Coast electric and they say to run direct to battery, not the cutoff switch. They said that shutting the power off while the car was running could hurt the alternator and they don't recommend it. Called NHRA and they were very vague about having power at the alternator all of the time even with the main power switch off. I know many tracks when they tech will shut the car off from the cutoff switch as their test.
I'd say shutting off the power to a 1 wire alternator at WOT would not be recommended by the manufacturers.
Eman is offline   Reply With Quote
Old 07-24-2018, 07:27 PM   #25
Ed Wright
Veteran Member
 
Ed Wright's Avatar
 
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
Likes: 896
Liked 389 Times in 168 Posts
Default Re: alternator

Quote:
Originally Posted by Eman View Post
On the one wire alt. if your battery is in the back how are you wiring it? I run a powermaster one wire, been on the car for almost 20 years and had to replace the regulator once. I've spoken to Powermaster,Mechman and East Coast electric and they say to run direct to battery, not the cutoff switch. They said that shutting the power off while the car was running could hurt the alternator and they don't recommend it. Called NHRA and they were very vague about having power at the alternator all of the time even with the main power switch off. I know many tracks when they tech will shut the car off from the cutoff switch as their test.
I'd say shutting off the power to a 1 wire alternator at WOT would not be recommended by the manufacturers.
Jr Stockers were not allowed to move the batteries. Still under the hood. Ten gauge wire to Batt +.
__________________
Ed Wright 4156 SS/JA
Ed Wright is offline   Reply With Quote
Old 07-24-2018, 09:06 PM   #26
Eman
Member
 
Join Date: May 2014
Location: E TN
Posts: 435
Likes: 14
Liked 100 Times in 57 Posts
Default Re: alternator

OK, I understand about if the battery is in stock location you don't need a cutoff at the back of the car.
You mentioned cutting alt. power at WOT with a 1 wire alt. Doesn't matter where the battery is cutting power to a running 1 wire alt. is not recommended and can hurt the regulator.
If the load of an alt. is enough to warrant cutting it off the easiest way is with an alt. wired like the factory did it. On a GM style all you need is the heavy wire like a 1 wire and a wire powered by ignition feed with an idiot light in the circuit or a diode to prevent feedback which would keep the ign powered.
Generally the only reason an alt has much of a load is if the battery is low or you're running a lot of accessories. My car is a bracket car and I charge between rounds while cooling mostly to eliminate the draw on the battery. This way the alt. only has to replenish what is drawn from starting the car and what the ign and possibly the taillight draws.
Eman is offline   Reply With Quote
Old 07-27-2018, 07:28 PM   #27
Ed Wright
Veteran Member
 
Ed Wright's Avatar
 
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
Likes: 896
Liked 389 Times in 168 Posts
Default Re: alternator

Quote:
Originally Posted by Eman View Post
OK, I understand about if the battery is in stock location you don't need a cutoff at the back of the car.
You mentioned cutting alt. power at WOT with a 1 wire alt. Doesn't matter where the battery is cutting power to a running 1 wire alt. is not recommended and can hurt the regulator.
If the load of an alt. is enough to warrant cutting it off the easiest way is with an alt. wired like the factory did it. On a GM style all you need is the heavy wire like a 1 wire and a wire powered by ignition feed with an idiot light in the circuit or a diode to prevent feedback which would keep the ign powered.
Generally the only reason an alt has much of a load is if the battery is low or you're running a lot of accessories. My car is a bracket car and I charge between rounds while cooling mostly to eliminate the draw on the battery. This way the alt. only has to replenish what is drawn from starting the car and what the ign and possibly the taillight draws.
2 Electric fuel pumps ( did not have the pumps we have today), and the ignition system. Small, light weight battery up front. Much more stock than today's Stock 265" engine. Not sure what you don't get. And, no, we did not have battery cut offs at the back of the cars then.
__________________
Ed Wright 4156 SS/JA
Ed Wright is offline   Reply With Quote
Old 07-27-2018, 08:44 PM   #28
Bob Mulry
VIP Member
 
Bob Mulry's Avatar
 
Join Date: Apr 2002
Location: Coarsegold, CA
Posts: 1,016
Likes: 57
Liked 315 Times in 100 Posts
Default Re: alternator

Quote:
Originally Posted by Lew Silverman View Post
Wowsers!!


What did you think was illegal? The rule book states that you HAVE to have an alternator so that's what we are checked for. That, and to make sure the belt isn't slipping. I've never had mine tested for output.

I had to go check my rulebook to make sure that I haven't been reading it wrong for the last 40 years....

Section 11A Page 4 2018 NHRA rulebook

FAN, GENERATOR, WATER PUMP
Alternator or generator must be engine-driven and functioning.
Belt must be tight enough to drive equipment in a satisfactory
manner without excessive or noticeable slippage. May be
relocated. Aftermarket pulleys permitted. Electrically driven fans
and water pumps permitted. Water pump must bolt on, with no
modifications to block. Use of “smog pump” or air pump for
crankcase evacuation
prohibited.
__________________
Bob Mulry 7516 STK
A & M Motorsports
Bob Mulry is offline   Reply With Quote
Old 07-27-2018, 11:21 PM   #29
Tom Broome
Member
 
Join Date: Sep 2009
Posts: 136
Likes: 78
Liked 70 Times in 39 Posts
Default Re: alternator

Quote:
Originally Posted by Bob Mulry View Post
I had to go check my rulebook to make sure that I haven't been reading it wrong for the last 40 years....

Section 11A Page 4 2018 NHRA rulebook

FAN, GENERATOR, WATER PUMP
Alternator or generator must be engine-driven and functioning.
Belt must be tight enough to drive equipment in a satisfactory
manner without excessive or noticeable slippage. May be
relocated. Aftermarket pulleys permitted. Electrically driven fans
and water pumps permitted. Water pump must bolt on, with no
modifications to block. Use of “smog pump” or air pump for
crankcase evacuation
prohibited.
Yep that alternator functions. Want to check it at WOT? Sure.....stand really close right there!

Last edited by Tom Broome; 07-27-2018 at 11:22 PM. Reason: Got it
Tom Broome is offline   Reply With Quote
Old 07-28-2018, 08:28 AM   #30
Ed Wright
Veteran Member
 
Ed Wright's Avatar
 
Join Date: Mar 2005
Location: Sand Springs, OK
Posts: 8,132
Likes: 896
Liked 389 Times in 168 Posts
Default Re: alternator

Quote:
Originally Posted by Tom Broome View Post
Yep that alternator functions. Want to check it at WOT? Sure.....stand really close right there!
There ya go!!
__________________
Ed Wright 4156 SS/JA
Ed Wright is offline   Reply With Quote
Reply


Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off

Forum Jump


All times are GMT -4. The time now is 08:28 AM.


Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2024, vBulletin Solutions Inc.
Copyright © Class Racer.com. All Rights Reserved. Designated trademarks and brands are the property of their respective owners.