Senojev
Veteran Member
- Joined
- Sep 6, 2017
- Messages
- 78
- Location
- USA
- Vessel Name
- Sir Tugley Blue
- Vessel Make
- 2010 Nordic Tug - 2010
Delton 28
The Delco 28 I have was bought for $285 from a Delco dealer on the east coast. I had it converted to external regulation at a local alternator shop for $75. It has around 1000 hours on it with no issues. I don’t understand why this would not fit on your Cummins QSB as I think this is the same engine as in my 37 Nordic. The Delco is offered in several standard mounting configurations. Installation took about 30 minutes. Just a matter of removing existing Delco and bolting in the new one.
The curves I provided come straight from the Delco brochure. It provides 120 A at 2000 shaft rpm or just over 700 engine rpm with a 2.8 pulley.
In your response you note that you believe your Balmar output matches their published data. That would be true if you have a 2:1 ratio but you stated you have a 2.8 ratio. With this ratio, you should be getting around 35/40A at your idle speed so the alternator is not meeting spec and I would suggest returning it. For the price of the Balmar you could buy 4 of the 28 QSI.
The Delco 28 I have was bought for $285 from a Delco dealer on the east coast. I had it converted to external regulation at a local alternator shop for $75. It has around 1000 hours on it with no issues. I don’t understand why this would not fit on your Cummins QSB as I think this is the same engine as in my 37 Nordic. The Delco is offered in several standard mounting configurations. Installation took about 30 minutes. Just a matter of removing existing Delco and bolting in the new one.
The curves I provided come straight from the Delco brochure. It provides 120 A at 2000 shaft rpm or just over 700 engine rpm with a 2.8 pulley.
In your response you note that you believe your Balmar output matches their published data. That would be true if you have a 2:1 ratio but you stated you have a 2.8 ratio. With this ratio, you should be getting around 35/40A at your idle speed so the alternator is not meeting spec and I would suggest returning it. For the price of the Balmar you could buy 4 of the 28 QSI.