16 amp vs 40 amp charging system

[CircleHook]

In the words of Krazymann - If I don't ask any questions, I'll never learn anything.

What is difference in a 16 and 40 amp systems? Weight difference can't be more than the total of a 40 amp flywheel and 2 voltage regulator-

[WillySteve]

That's about it, along with the stator!

[rock]

Possibly a heavier load magnetically not to mention rotating weight on the crankshaft resulting in parasitic drag.

Rock

[W2F a V-King]

Heavier flywheel is more load on the upper main bearing. If you don't require the extra amps the 16 is easier on the motor. Might be less heat generated under the flywheel as well.

[gmorgan]

There is about six pounds difference between a high perf lightweight flywheel and the flywheel used for 40 amp production. This has to be better for the crank, but unless it is quicker in accelleration, there is no performance increase, in my opinion. With the 16-amp setup, you dont have to run the expensive regulators of the 40-amp setup.

[j_martin]

In the words of Krazymann - If I don't ask any questions, I'll never learn anything.

What is difference in a 16 and 40 amp systems? Weight difference can't be more than the total of a 40 amp flywheel and 2 voltage regulator-

About 24 amps.

I like a dual coil 40 amp system on the fishing boat. I run one coil into a regulator and charge the starting battery with that. The other coil goes to a real bridge rectifier with no regulator, and is used to top off the trolling batteries. (24 volts) I should come up with a 24v regulator for that circuit, but I mostly fish slow and use a lot more trolling motor than main motor.

The swap is stator coil, flywheel, and regulators. There are 2 versions of 40 amp, a single coil wet regulator that is junk right out of the box, and dual coil dual regulator. That one is normally wired in parallel, but can be split for 2 battery systems as I described. Each coil will put out up to 90 V at 6000 rpm.

Some 16 amp stator mounts will need a little metal routed out of them to clear a part of the stator. It'll be obvious when you look at it. Another pitfall (from experience) is one or more of the stator mounting screws can interfere with the trigger timing.

[90 5.0]

At sustained high rpm the 40 amp system dumps more voltage than the regulators can deal with, or that’s my theory anyway.

Running a 40amp system for years with no problem at 7-7600 for decent stretches and 7800 shorter bursts no issue.

Started runnnng it over 8k a lot and fried regs and stators till i went to 16

[j_martin]

At sustained high rpm the 40 amp system dumps more voltage than the regulators can deal with, or that’s my theory anyway.

Running a 40amp system for years with no problem at 7-7600 for decent stretches and 7800 shorter bursts no issue.

Started runnnng it over 8k a lot and fried regs and stators till i went to 16

Each winding puts out about 15V per 1000 rpm, so it would be at 120V at 8000 rpm. The regulator lets the coil go and sample the voltage. I can see the over-voltage being hard on things.

The 16 amp system just rectifies the output, and loads it down with the battery, thus controlling the voltage. Current is limited by the amount of iron and strength of the magnets. RPM makes no difference.

A 16 amp system without being mostly loaded, as in a carb'd V6, will use a lot of water in the battery. It's tough on batteries. Another drawback is a failed battery connection usually takes out all electronics and lights that are lit at the time.

[Krazymaan]

I know this isn't what your talking about but it still applies:
So you also shouldn't be running a 16 amp system with EFI, Stereo, lighted dashboards, exterior lights and a mini compressor to blow up your inner tube. Thats why they make 40 amp.
Plus you can't be operating your digital bass boat on a racing stator. Well, maybe in Kentucky.

[j_martin]

I know this isn't what your talking about but it still applies:
So you also shouldn't be running a 16 amp system with EFI, Stereo, lighted dashboards, exterior lights and a mini compressor to blow up your inner tube. Thats why they make 40 amp.
Plus you can't be operating your digital bass boat on a racing stator. Well, maybe in Kentucky.

You pretty well nailed it. That's why I converted the XR4 on my bass boat to 40 amp.