At the risk of getting some flack out of it, I feel a need to chime in.
The issue here regarding the longevity of the alternator based on its rotational speed is not about the DURATION of its use but has everything to do with its rotation speed and amperage load.
Classically rally alternators shit themselves by excessive revs and high amperage loads when using a zillion lights.
Air conditioner compressors can suffer the same fate if revved above their mechanical stable rate. to offset this, the electric clutches can be disengaged by a rev limit setting to make sure that doesn't happen.
A larger diameter pulley will reduce engine load and improve reliabilty. For a race car, the amperage so produced will still be more than enough to provide for any current drain. Isn't that what we are all trying to do here?
The issue here regarding the longevity of the alternator based on its rotational speed is not about the DURATION of its use but has everything to do with its rotation speed and amperage load.
Classically rally alternators shit themselves by excessive revs and high amperage loads when using a zillion lights.
Air conditioner compressors can suffer the same fate if revved above their mechanical stable rate. to offset this, the electric clutches can be disengaged by a rev limit setting to make sure that doesn't happen.
A larger diameter pulley will reduce engine load and improve reliabilty. For a race car, the amperage so produced will still be more than enough to provide for any current drain. Isn't that what we are all trying to do here?
Transaxle Alfas Haul More Arse
Exactly.MD wrote:Isn't that what we are all trying to do here?
Here's my setup. Small Suzuki alternator with bigger pulley. Saves 1500g on dead weight and some on inertia. Our typical race is 6 hours, so reliability is also very important. If the alternator get broken, the race is ruined.
http://uk.pg.photos.yahoo.com/ph/kterkk ... pg&.src=ph
Kimmo / alfatune.fi
Ok, I can see your point. Rally alternators surely die because of constant use outside their electrical envelope though. I have yet to see even one alternator fail in a race car because of bearing failure.
As an exercise in making eveything taut, I have no objections.
As an exercise in making eveything taut, I have no objections.
Mats Strandberg
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
-Scuderia Rosso- Now burned to the ground...
-onemanracing.com-
-Strandberg.photography-
GTV 2000 -77 - Died in the fire.
155 V6 Sport -96 - Sold!
Long overdue update... Find below some pics of the 30 amp, 6 lbs Denso mini alternator and install I ended up using. Bought 2 brand new off Ebay for $50 each, off a Yamaha 3 cyl tractor application. I have run this setup at 2 events without issues, sufficient juice to run dual fuel pumps.
It came with a vee-belt pulley, but digging through the trash bin at an alternator shop and a visit to the local autoparts store for a proper length serpentine belt provided pulley and belt. Bracket is modified from a stock Milano mount.
Jes
It came with a vee-belt pulley, but digging through the trash bin at an alternator shop and a visit to the local autoparts store for a proper length serpentine belt provided pulley and belt. Bracket is modified from a stock Milano mount.
Jes
- Attachments
-
- MiniAlternator3.jpg (141.42 KiB) Viewed 6345 times
-
- MiniAlternator2.jpg (133.51 KiB) Viewed 6345 times
-
- MiniAlternator1.jpg (132.64 KiB) Viewed 6345 times
87 Milano Verde - daily driver - Juliet
87 Milano 3.0 Motronic - budget race car - Roxanne
87 Milano 3.7 24v - race car
(Repeat or do as I say at your own risk - be critical)
87 Milano 3.0 Motronic - budget race car - Roxanne
87 Milano 3.7 24v - race car
(Repeat or do as I say at your own risk - be critical)
-
- Silver
- Posts: 42
- Joined: Sun Nov 11, 2007 7:28 pm
- Location: Brisbane, Australia
.
There is an extra 50grams of weight to be saved if you chop the excess off the ends of the mounting bracket! Also, cannot the pulley be made from aluminium? How about the bracket itself?
The Geo/Suzuki alternators can beb had for as little as $50AuD in working order. www.redlinegti.com - there are one or two there right now.
The Geo/Suzuki alternators can beb had for as little as $50AuD in working order. www.redlinegti.com - there are one or two there right now.
Non Illigitimi Carborundum