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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Gas > Atomic 4 > A4 alternator?
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Thread: A4 alternator? Reply to Thread
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Topic Review (Newest First)
04-01-2013 04:27 PM
hellosailor
Re: A4 alternator?

"I think it's a relevant question to ask why can the sparks generated by an alternator be so dangerous while the Ingniton system is way more prone to issue sparks in the engine room... "
An alternator routinely makes sparks as the copper rings rotate under the graphite contacts. The sparks are normal. And that's why conventional alternators have wire screens (called "ignition protection" or "spark protection") installed over all air gaps, in the theory that the fine metal mesh will extinguish any flame front from the vapors getting to the spark.
On the other hand, an ignition system in proper working order DOES NOT routinely make any sparks. It conducts the ignition pulses 100% through the conductor in the wire, from the coil to the plugs, and there is never any sparking except inside the engine, or inside the distributor where the rotor and cap are also routinely sparking--but in a sealed enclosure.

It can be damned hard to make fuel combust, or explode. If you've ever tried to get an engine going and it wouldn't start, that's proof of how hard it can be to make the damned fuel explode as it is intended to.

Of course if you've ever spent time in a burn ward, where they put victims in a coma because even morphine cannot blot out the pain from extensive burns, you develop a whole new respect for the concept of explosions and flammable liquids. There are some places you never want to be. A bed in a burn ward is real close to the top of that list.
04-01-2013 02:39 PM
Isla30
Re: A4 alternator?

Norah, perhaps you could simmer down just a bit. There is nothing wrong with seeking advice in forums such as this one. Also no point in being so rude and telling people they don't know what they are doing... I think it's a relevant question to ask why can the sparks generated by an alternator be so dangerous while the Ingniton system is way more prone to issue sparks in the engine room... BTW I got my original marine alternator rebuilt and still will make sure not to get anywhere near you or your boat...
03-25-2013 07:30 PM
tommays
Re: A4 alternator?





I do not understand why anybody would do anything but and off the shelf Brand New Leece Nevill WHICH is and exact replacement from spidermarine among others



Fits in as its the same case and IMHP anything over 51 AMPS is waste with the tiny belt and tiny drive unit
03-24-2013 11:07 PM
downeast450
Re: A4 alternator?

Quote:
Originally Posted by Jimmy E View Post
Downeast 450 ......I was thinking of doing the same thing. Was it a simple bolt on replacement? Using the same bracket and belt?
Jimmy,

The same pulley but a different belt. The belt is listed on Moyer's site with the alternator. Direct bolt on and wire up. I also purchased an Indigo Electronics Atomic 4 Belt Tensioning Device.

Indigo Electronics Atomic 4 Belt Tensioning Device

It was a good decision. I am happy to have it. Well worth the money.

Down
03-24-2013 08:27 PM
Jimmy E
Re: A4 alternator?

Downeast 450 ......I was thinking of doing the same thing. Was it a simple bolt on replacement? Using the same bracket and belt?
03-22-2013 01:46 PM
downeast450
Re: A4 alternator?

I wanted a larger alternator than the 35 amp one that came with my rebuilt A-4 so I purchased a 55 amp one from Moyer. It is a good alternator and keeps our batteries happy. We have the "old" one as a spare. I would recommend taking a look at Moyer's web site.

Down
03-22-2013 09:40 AM
hellosailor
Re: A4 alternator?

Hey, Norah, I can't believe that you're replying to a TWO YEAR OLD POST or that you've never seen automotive equipment used on boats.

Don't worry, you've scared everyone away from you and your boat.
03-22-2013 08:57 AM
norahs arc
Re: A4 alternator?

After reading this thread I can't beleive that some people are putting automotive equipment in their engine rooms. If you don't know what you are doing hire someone who does please.
If you are running automotive alternators or other dangerous equipment please stay well away from me and my boat.
04-29-2011 05:14 PM
Stu Jackson Additional New Alternator Source & Maine Sail's Analysis of Alt. Sources

Reply #16
02-17-2011 07:06 PM
CalebD I've used 'Mamocks Motor Electric' in Annapolis and was happy with the service. Mamocks Motor Electric Annapolis, MD | 314 Legion Avenue
There is this place in Baldamore but I have never used them: ******************** Free Starter, Battery or Alternator Check - Home
This thread has more than 10 replies. Click here to review the whole thread.

 
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