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Old 28-02-2015, 08:04   #16
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Location: WY / Currently in Hayes VA on the Chesapeake
Boat: Ocean Alexander, Ocean 44
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Re: Help! Dual V Belt alignment issue.

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Originally Posted by abelungu View Post
Reboring is not a good idea, if it's cast. If its stock? why be messing around have one made. Oversize a little so it run faster. Alternators burn because of not enough ventilation most of the time. Leave room for the best fan you can get on there.



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We can rebore using a lathe. It is aluminum (I think 6013 but it may be 6061) so cutting it will not be a problem. I would like to get the company that makes the one with the smaller bore to make one for me from rod. The small bore one also has a deep recess because some of the small alternators have a shorter shafts than the heavy duty ones. The Delco 28SI has a long enough shaft that the pulley can be 1.5" thick without having to cut a recess for the nut. It will be early next week before a decision is made.

This pulley is on the alternator so I think you intended to say smaller rather than oversize to increase the alternator rpm. I am reducing the diameter some. The thing that concerns me is belt wrap. I have about 120 degrees. I haven't found a chart yet that shows how much I need for:
Dual 1/2" belts with 120 degree wrap. I would like to use 2.5 inch alternator pulley. Anybody know if the 2.5" will spin this alternator without belt slip?
160 amp alternator should need about 6.5 horse power and I don't know how much torque.
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Old 02-03-2015, 19:34   #17
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Re: Help! Dual V Belt alignment issue.

I do not think you will have a problem, so far you are on the money. I am pulling 120amp of 45hp @120 degrees no problem, running at 1800 rpm 5 4D's loading up a 4KW Iams inverter. Life is good


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Old 02-03-2015, 19:47   #18
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Re: Help! Dual V Belt alignment issue.

Quote:
Originally Posted by abelungu View Post
I do not think you will have a problem, so far you are on the money. I am pulling 120amp of 45hp @120 degrees no problem, running at 1800 rpm 5 4D's loading up a 4KW Iams inverter. Life is good


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Are you saying 1800 alternator rpm or engine rpm. If engine rpm what is the ratio to the alt.?

Are you using 2 belts?


After digging through the Dayton engineering site I think I will be ok with the narrow spacing on the alt. pulley. They show a max of 5 degrees offset in designing drive systems. Even if I line up one and have all the offset on one belt (instead of splitting the difference as planned) I will have well under 2 degree offset on one belt. If I get it right in the middle it will be under 1 degree. After it is on I will keep an eye on it and if it starts making dust I will have another one made up. So I plan on putting it together in the next couple of weeks. I still have some clean up and painting to do on the engine.

Thanks for all the input. I'll let you know if it is a satisfactory solution.
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