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  #1  
Old 02-12-2020, 05:52 AM
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rmartingt rmartingt is offline
 
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Default Alternator bracket for 2.25” lug?

I’m using a Denso automotive alternator as my primary and it has a 2.25” main mounting lug (I believe this is the “large” Denso frame?). Anyone know what the right mounting bracket is for this? Or am I in “fabricate your own” territory?

Engine is a wide-deck O-360.
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  #2  
Old 02-12-2020, 08:33 AM
lr172 lr172 is online now
 
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can't really help, but can advise that there is some variation out there. I made custom brackets (used the stock commonly available U bracket that bolts to case). I made a copy for a buddy installing the same denso alt on a wide deck and they wouldn't fit.

Also, that U bracket has 7/16 holes and the denso alt has 3/8. I used bronze spacers/inserts to tighten it up.

Larry
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Last edited by lr172 : 02-12-2020 at 10:36 AM.
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  #3  
Old 02-12-2020, 10:13 AM
Kent Ashton Kent Ashton is offline
 
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Location: Concord, NC
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A bracket would be hard to bend up from one piece of flat stock and get the dimensions right. I have made them from two pieces of 1/4" mild steel angle. Drill them for the long mount bolt then cut the other legs of the angle to get the correct length and weld them together.
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  #4  
Old 02-12-2020, 02:57 PM
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rmartingt rmartingt is offline
 
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Quote:
Originally Posted by Kent Ashton View Post
A bracket would be hard to bend up from one piece of flat stock and get the dimensions right. I have made them from two pieces of 1/4" mild steel angle. Drill them for the long mount bolt then cut the other legs of the angle to get the correct length and weld them together.
I like that idea and I have the equipment... I'll just need to make a few test pieces to get my welding up to snuff! I'd imagine I could get a few out of just a foot or two of angle.
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  #5  
Old 02-12-2020, 04:37 PM
McStevens McStevens is offline
 
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Location: Edmonds, WA
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I'm wondering the same thing with my non-standard alt. Figured I could bend one myself with some heat. Not sure how I feel about welding two angles together given the environment and importance of this thing.
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  #6  
Old 02-13-2020, 08:26 AM
Kent Ashton Kent Ashton is offline
 
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Quote:
Originally Posted by McStevens View Post
Not sure how I feel about welding two angles together given the environment and importance of this thing.
Yeah, I have thought the same about engine-mount tubes. :-)
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  #7  
Old 02-13-2020, 08:47 AM
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9GT 9GT is offline
 
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Quote:
Originally Posted by McStevens View Post
I'm wondering the same thing with my non-standard alt. Figured I could bend one myself with some heat. Not sure how I feel about welding two angles together given the environment and importance of this thing.
I fabricated and welded the alternator bracket out of steel I had in the scrap bin for my RV-10.
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  #8  
Old 02-13-2020, 11:06 PM
McStevens McStevens is offline
 
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Quote:
Originally Posted by Kent Ashton View Post
Yeah, I have thought the same about engine-mount tubes. :-)
Heh. Fair enough.
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