Home » Public Forums » GMCnet » 28SI Alternator vs 27SI
Re: 28SI Alternator vs 27SI [message #360221 is a reply to message #360220] |
Fri, 20 November 2020 18:19 ![Go to previous message Go to previous message](/GMCforum/theme/default/images/up.png) ![Go to next message Go to previous message](/GMCforum/theme/default/images/down.png) |
TR 1
![United States United States](/GMCforum/images/flags/us.png) Messages: 348 Registered: August 2015 Location: DFW
Karma:
|
Senior Member |
|
|
Matt Colie wrote on Fri, 20 November 2020 14:27TR 1 wrote on Fri, 20 November 2020 12:46So 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alternator above 100 amps, and I came across this page on the Delco Remy website which I believe says the 27SI was superseded by the 28SI.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,
What do you hope to get with a larger alternator? Even if the house bank has been relocated to the rear and you ran a pair of welding cables to it, It will still take about 5 or 6 hours to recover a 4D or pair of GC2s from 50%SOC to 95%. Another issue I will caution you about is that the 28SI is a much larger frame than the 27SI, so be sure to collect the real dimensions before you go too far.
Matt
Thanks Matt...
I took another look and you may be right, it may be too deep... But, I don't have heads on my coach right now, so just kind of guessing what kind of clearance there is.
The 28SI has an internal fan instead of the external on the 27SI... That is part of the additional depth. But I still think there is a about 2 inches more depth front to back over the 27SI. The mounting holes and overall diameter look to be about the same if you go with the "J180 Short Hinge" version.
The reason for the larger alt is to run an electric AC unit through my inverter without having to run the generator. The AC uses 6-700 watts plus whatever is lost through the inverter. I can't find anything larger than a 100amp 27SI, which is what I have now... And that's sort of pushing it. Especially if the dash ac fan is on, headlights, etc. I am not looking to charge up the banks so much as keep up with the running load if I add in the electric AC....
I already have 2/0 cables feeding the batts and inverter..... I will need to update the cable from the alternator to the combiner though for sure.
Mark S. '73 Painted Desert,
Manny 1 Ton Front End,
Howell Injection,
Leigh Harrison 4bag and Rear Brakes,
Fort Worth, TX
|
|
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
28SI Alternator vs 27SI
By: TR 1 on Fri, 20 November 2020 11:46
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Fri, 20 November 2020 18:19
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Fri, 20 November 2020 18:37
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: JohnL455 on Sat, 21 November 2020 19:47
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: JohnL455 on Sun, 22 November 2020 18:35
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Mon, 23 November 2020 08:25
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: JohnL455 on Mon, 23 November 2020 10:16
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Mon, 23 November 2020 10:34
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: [GMCnet] 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Mon, 23 November 2020 12:04
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Wed, 25 November 2020 09:58
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Wed, 25 November 2020 12:22
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: mghamms on Wed, 25 November 2020 12:35
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Wed, 25 November 2020 13:14
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: mghamms on Wed, 25 November 2020 13:45
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: mghamms on Thu, 26 November 2020 10:51
|
![Read Message Read Message](/GMCforum/theme/default/images/read.png) |
|
Re: 28SI Alternator vs 27SI
By: TR 1 on Fri, 04 December 2020 12:58
|
Goto Forum:
Current Time: Wed Jun 26 14:01:42 CDT 2024
Total time taken to generate the page: 0.00948 seconds
|