All Things Chev

[AB]

A poofteenth under 80mm OD checked here thanks mate. V belts obviously slightly smaller ID measurement.


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GQ TD42 ute same size mate...

[poindexter]

the ZD30s have a cutout in the radiator shroud to allow air to flow to the Alt for cooling, maybe look at doing something similar.

[PeeBee]

Mark, my 100amp alternator failed after 1500klm. It overheated to the extent the insulation on the windings charred and blew out the back. I am betting your alternator has been beefed up to generate the 170amps peak and the rectifiers have been left the same, as they can only be so big to fit inside the alternator. To that end the recifiers are doing more unit work at 170amp rating than they are at say 90. Regards the 60amp draw, I would say this is well above the duty factor for that alternator, probably above most alternators to be honest. I am going to fit the external diode pack as previously discussed to get past the heat resistance issue.

If in doubt, seek professional help!!!

[MB]

Cheers blokes, for sure PD I do have a fancy bonnet close to ready for this although it really shouldn’t be needed for this experience underway :-(


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[PeeBee]

2.43 to 1.

[the evil twin]

Hmmm... if thats the size for the TD then thats a tad slow to me for a Chev

It varies a bit from manf to manuf but below from Prestolite is common to most


A pulley with the desired ratio will drive the alternator fast enough at engine idle to charge the electrical system slightly, yet will not drive the alternator too fast (over speed) at the upper end of the engine speed range. In general, pulley ratios of about 2:1 to 3:1 provide good charging system performance and assure longer service life of the alternator bearings.

For passenger cars, approximateley a 2:1 pulley ratio is typical. This pulley ratio provides about 5 to 10 amperes output at idle while limiting alternator RPM at the upper end of the engine speed range. The top speed of the 5" frame alternator should not exceed approximately 8000 maximum continuous RPM.

For heavy-duty diesel engines, a 3:1 pulley ratio can be used since these engines are governed so as not to exceed 2100 RPM. The top speed of the 6 1/2" frame alternators should be limited to approximately 5000 to 6000 maximum continuous RPM.

[the evil twin]

the ZD30s have a cutout in the radiator shroud to allow air to flow to the Alt for cooling, maybe look at doing something similar.

Hmmm... I always thought that "cutout" is for airflow from the A/C thermoelectric fan.
If it was solid the shroud/engine fan would partially block the flow esp in traffic

[the evil twin]

As a point of interest I'd be a tad suprised if you get max output from that Alt with only one drive belt as well.

Anything over about 110/120 will usually have two belts.
That Alt of yours will pull something towards 2 horsepower at max output

[poindexter]

which is why poly vee belts are better ie serpentine.

[PeeBee]

I can pull 200amps out of my aux alt. on 1 'a' section vee belt, but for longevity you don't want to do this. I tong tested this with a DC meter so know it is possible.