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Old 06-06-2021, 18:23   #1
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Alternator: Delco Remy 28SI Clone - performance

Does anyone have information about 28SI Clones? In particular, comparison with genuine Delco Remy 28SI Alternators performance, output and longevity?

Please try to identify the source and manufacturer of these clones if at all possible. Also if they are remanufactured or repaired.


Originally asked by offpist
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Old 06-06-2021, 20:26   #2
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Re: Alternator: Delco Remy 28SI Clone - performance

We have a 27si clone.........close??

A Jaylec variant same as this
Didn't get it from these guys but paid $200 less through a mates account

https://automotivesuperstore.com.au/jaylec-65-0027-1

I did request a Delco and this is what was supplied
Delco are prohibitively expensive in Australia.
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Old 07-06-2021, 16:05   #3
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Re: Alternator: Delco Remy 28SI Clone - performance

I bought a copy 28si of ebay 150USD plus 50 shipping and 50 import duty. Its been in 2 years and all is well. I downgraded it to 120A for lithium charging with a balmar All is well. nI did fit the temp sense though. Fully charges 600Ah in 4 hours.
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Old 20-02-2024, 04:29   #4
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Re: Alternator: Delco Remy 28SI Clone - performance

I have been running two 28SI clones for 2 years now.
Combined charging power of 400A on our Yanmar 4JH4AE.

Running 1 pcs Wakespeeed WS500 and it controlls both 28SI.

I have been gradually increasing the max temperature rating and we are currently cruicing in Caribbean. Startet off at 90`C and Increased to 95`C, then 100`C, then 105`C then 110`C, then 115`C and now we are running them at 120`C.

I have yet to see them reach 120`C.. It flattens out at 118`C.

The front bearing is 25x62x17 (mm) and rear bearing is 15x35x11 mm.
I have already sourced new SKF bearings should they fail.

Plus, I have two spare clones onboard ready to go. Got them off eBay for 136 dollar, free shipping.

Also, i got these bussing to reduce the mounting holes from 13mm to 10mm.
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Old 20-02-2024, 04:35   #5
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Re: Alternator: Delco Remy 28SI Clone - performance

Here is an typical charging session for us. 1 hour motoring to move from one anchorage to another.

Starts out at 400A+ but flats out at 300A, this is at 1800 RPM.
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Old 20-02-2024, 07:50   #6
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Re: Alternator: Delco Remy 28SI Clone - performance

Quote:
Originally Posted by offpist View Post
Here is an typical charging session for us. 1 hour motoring to move from one anchorage to another.

Starts out at 400A+ but flats out at 300A, this is at 1800 RPM.

Offpist, thanks. Useful info. How do they do at lower RPM, say 1000 - 1200 rpm? or even 1500? What output roughly, and do they overheat more?
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Old 20-02-2024, 08:42   #7
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Re: Alternator: Delco Remy 28SI Clone - performance

I dont like the consept of charging at idle speed, or slightly over like 1000 RPM, so i have tuned the WS500 to charge at only 20% under 1200 RPM.
Dont have any data for you there.

But I do notice that when running at 2200 RPM it does run colder, and charges slightly more than at 1800 RPM.
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Old 20-02-2024, 08:55   #8
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Re: Alternator: Delco Remy 28SI Clone - performance

Quote:
Originally Posted by offpist View Post
I dont like the consept of charging at idle speed, or slightly over like 1000 RPM, so i have tuned the WS500 to charge at only 20% under 1200 RPM.
Dont have any data for you there.

But I do notice that when running at 2200 RPM it does run colder, and charges slightly more than at 1800 RPM.

I do agree with you about that, but occasionally I find it necessary, and was wondering how fast it ramps up compared to a newer balmar XT for example.
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Old 20-02-2024, 20:17   #9
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Re: Alternator: Delco Remy 28SI Clone - performance

Quote:
Originally Posted by offpist View Post
I dont like the consept of charging at idle speed, or slightly over like 1000 RPM, so i have tuned the WS500 to charge at only 20% under 1200 RPM.
Dont have any data for you there.

But I do notice that when running at 2200 RPM it does run colder, and charges slightly more than at 1800 RPM.
Wow my cruising speed is 1250 RPM
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Old 21-02-2024, 06:47   #10
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Re: Alternator: Delco Remy 28SI Clone - performance

Well, Yanmar's like a higher rpm for some reason.
I gather from opist's


Quote:
Starts out at 400A+ but flats out at 300A, this is at 1800 RPM.

Quote:
I do notice that when running at 2200 RPM it does run colder, and charges slightly more than at 1800 RPM.

That kind of answered my question. At 2200 rpm his system runs cooler and charges at slightly more than 1800 rpm which for a single 200a alternator is 150a. So it appears that the 28SI ramps up fairly fast, but not as fast as a Balmar.
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Old 03-03-2024, 03:18   #11
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Re: Alternator: Delco Remy 28SI Clone - performance

Before I installed the Delco 28SI I had two Balmar alternators, one AT200 and one 60 series 140A.

And I can say the Delco 28SI clones produce much more power and runs a lot colder than the two Balmar Alternators did.

I believe its simply due to the bigger size and larger fans in the Delco, providing better cooling.

We live onboard full time cruising in the Caribbean, and for the last 90 days our average consumption has been 510AH pr day.

Half of this is covered by solar, but total of 20 378 AH has been made with the engine these 90 days.

That equals to 58 hours motor if we calculate an 350A average.

If I had an 60A alternator as many do, it would take 765 hours of motoring to produce the same power.

I also love how easy the 28SI is to take apart and replace bearings.
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