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28SI Alternator vs 27SI [message #360217]

Fri, 20 November 2020 11:46

TR 1

Messages: 348
Registered: August 2015
Location: DFW

Karma:

Senior Member

So I'm working on a project to increase the capacity on the factory alternator above 100 amps, and I came across this page on the Delco Remy website which I believe says the 27SI was superseded by the 28SI.

http://www.delcoremy.com/find-a-part/product-details/27si-alternator

The dimensions of the 28SI seems roughly the same as the 27SI, and they both seem to use the same "J180" mounting style. The 28SI seems to be used a lot on heavy duty trucks, school buses, etc. and is offered in factory amperages of 130-200 which slots in nicely above the 27SI.

I have an email inquiry in to Delco Remy to see if they can confirm this information, but wanted to check here to see if anyone may already be running a 28SI.

Looking online, it appears you can find aftermarket 200amp 28SIs for a little over 100 bucks... And Genuine Delco Remys for a little over 200 bucks.

Either way, I will post back here with what I find.

Mark S. '73 Painted Desert, Manny 1 Ton Front End, Howell Injection, Leigh Harrison 4bag and Rear Brakes, Fort Worth, TX

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[Message index]

		28SI Alternator vs 27SI By: TR 1 on Fri, 20 November 2020 11:46
		Re: 28SI Alternator vs 27SI By: Matt Colie on Fri, 20 November 2020 14:27
		Re: 28SI Alternator vs 27SI By: TR 1 on Fri, 20 November 2020 18:19
		Re: 28SI Alternator vs 27SI By: TR 1 on Fri, 20 November 2020 18:37
		Re: 28SI Alternator vs 27SI By: Matt Colie on Fri, 20 November 2020 20:13
		Re: 28SI Alternator vs 27SI By: Ken Burton on Sat, 21 November 2020 01:19
		Re: 28SI Alternator vs 27SI By: Ken Burton on Sat, 21 November 2020 01:35
		Re: [GMCnet] 28SI Alternator vs 27SI By: Ray Erspamer on Sat, 21 November 2020 17:50
		Re: 28SI Alternator vs 27SI By: JohnL455 on Sat, 21 November 2020 19:47
		Re: 28SI Alternator vs 27SI By: JohnL455 on Sun, 22 November 2020 18:35
		Re: 28SI Alternator vs 27SI By: TR 1 on Mon, 23 November 2020 08:25
		Re: 28SI Alternator vs 27SI By: JohnL455 on Mon, 23 November 2020 10:16
		Re: 28SI Alternator vs 27SI By: TR 1 on Mon, 23 November 2020 10:34
		Re: [GMCnet] 28SI Alternator vs 27SI By: James Hupy on Mon, 23 November 2020 11:06
		Re: [GMCnet] 28SI Alternator vs 27SI By: Ken Henderson on Mon, 23 November 2020 12:00
		Re: [GMCnet] 28SI Alternator vs 27SI By: Ken Burton on Wed, 25 November 2020 02:35
		Re: [GMCnet] 28SI Alternator vs 27SI By: Ken Henderson on Wed, 25 November 2020 05:06
		Re: [GMCnet] 28SI Alternator vs 27SI By: Matt Colie on Wed, 25 November 2020 09:59
		Re: [GMCnet] 28SI Alternator vs 27SI By: Ken Burton on Wed, 25 November 2020 18:00
		Re: [GMCnet] 28SI Alternator vs 27SI By: Matt Colie on Wed, 25 November 2020 19:12
		Re: 28SI Alternator vs 27SI By: TR 1 on Mon, 23 November 2020 12:04
		Re: 28SI Alternator vs 27SI By: TR 1 on Wed, 25 November 2020 09:58
		Re: 28SI Alternator vs 27SI By: TR 1 on Wed, 25 November 2020 12:22
		Re: 28SI Alternator vs 27SI By: mghamms on Wed, 25 November 2020 12:35
		Re: 28SI Alternator vs 27SI By: TR 1 on Wed, 25 November 2020 13:14
		Re: 28SI Alternator vs 27SI By: mghamms on Wed, 25 November 2020 13:45
		Re: 28SI Alternator vs 27SI By: Matt Colie on Wed, 25 November 2020 17:23
		Re: 28SI Alternator vs 27SI By: jhbridges on Wed, 25 November 2020 18:59
		Re: 28SI Alternator vs 27SI By: Matt Colie on Wed, 25 November 2020 19:18
		Re: 28SI Alternator vs 27SI By: mghamms on Thu, 26 November 2020 10:51
		Re: 28SI Alternator vs 27SI By: TR 1 on Fri, 04 December 2020 12:58

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