Mechman High Output Alternators

[i30krab]

Does anyone have experience with this company's product?
http://www.mechman.com/alt.htm

I have so many aftermarket mods I can't keep an alternator working properly more than 12 months. The diodes and rectifiers burn up and the high heat helps cook the whole altenator. I know when it's time for a new one when the volts start dropping from 14 down to 12.3 in 20 minutes. The air conditioning is the biggest culprit. I even tried a local shop that rewound my Hitachi stock 125 amp alt to 200 amps but this didn't work any better since the pulley can't spin fast enough to realize the extra amps and the rebuild parts weren't that good.

I'm looking at the 63G series
"Our 43G & 63G series PROPOWER alternators feature a new hybrid design that takes advantage of the best features of several different models. Designed specifically for Ford and many Imported vehicles. Their relatively small size affords a lot of power in this compact package. Easy bolt-on and simple plug in. The regulator is built in so there is nothing else to mount. Easy installation instructions are included PLUS all cables and Alternator connectors are labeled. (Adapter plugs and brackets required on some vehicles.) The 63G series may not fit your particular vehicle as it is larger, call for details. If you have any questions please send Email to: [email protected] or call (760) 244-2049."
The unit size is plug and play with a mounting bracket piece. The following shows the amps produced at diff motor rpms and alt rpms:63G series

ENG RPM - ALT RPM- AMPs

667 2000 83
833 2500 123
1000 3000 154
1167 3500 172
1333 4000 181
1500 4500 190
1667 5000 192
1833 5500 200
2000 6000 202

 

[tom slick]

I've used parts sold by http://www.alternatorparts.com/ before. they were all high quality and they sell some super duty alternators

 

[i30krab]

This company has no parts for imports as far as I can see.

 

[tom slick]

you are looking at the "63G" which is a ford alternator that may fit imports. alternatorparts.com also sells ford alternators, but would probably need an email to confirm what you need just like mechman.com


both websites are terribly designed and lack much figment information.

 

[Junior]

I would try to find the alternator derate curve and duty cycle. Those numbers look to be at 70F and a lot of alternators are not rated to put out the full amperage on a continuous basis. All the numbers will be lower when you get to 200 F. We use a 185 amp alternator on our equipment but at 200F it only puts out around 155 amps.

 

[i30krab]

This states the above figures are taken under operating temperatures.

"In the table below are the typical ratings for our Ford style case alternators under (hot) operating conditions. The RPM shown is the alternator rotor speed. The engine turns approximately 1/3 this speed. The cold (SAE) rating of these alternators is 12% to 20% more than shown in the table.
We test every alternator before it leaves our factory. We make the utmost effort to insure that we sell the finest unit. Quality is important to us and we are always trying to improve our products. When we rate our alternators, we rate them hot, not cold as other manufacturers do.

 

[Junior]

Just FYI the SAE standard temps are 25C and 85C per SAE J56.