| [GMCnet] Alternator Question (just curious) [message #361892] |
Thu, 21 January 2021 11:22  |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
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Will Delco 24si 165 Amp Alternator work in a GMC?https://www.jittruckparts.com/delco-remy-delco-remy-24si-160a-alternator-8600310?gclid=CjwKCAiA6aSABhApEiwA6Cbm__nqIvkprmdfyMrcRSX1djiuDAGSov_6Zb3 L9yrw2v6aZeF0WH-zcxoCsgEQAvD_BwESent from my U.S.Cellular© Smartphone
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Alternator Question (just curious) [message #361907 is a reply to message #361892] |
Thu, 21 January 2021 18:28  |
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Matt Colie
Messages: 8547
Registered: March 2007
Location: S.E. Michigan
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Ray Erspamer wrote on Thu, 21 January 2021 12:22
Will Delco 24si 165 Amp Alternator work in a GMC?
https://www.jittruckparts.com/delco-remy-delco-remy-24si-160a-alternator-8600310?gclid=CjwKCAiA6aSABhApEiwA6Cbm__nqIvkprmdfyMrcRSX1djiuDAGSov_6Zb3 L9yrw2v6aZeF0WH-zcxoCsgEQAvD_BwE
Sent from my U.S.Cellular© Smartphone
Ray,
Both this and the OE 27SI are J180 hinge mounts, so that much might bolt on and it is a remote sense for the regulator so that is good.
The two issues that bother me are:
I could not find my dimensioned drawings of the 27SI to compare, but the front offset might be different so it might be a trick line the belt up.
It does not seem to have the tapped hole that is part of the adjustment retention in our installation.
If you are doing this because there is no 27SI available, look around a little more. Both the 27SI 80& 100s were produced in massive quantities but don't buy a 27SI 200, because those are a different frame.
If you are doing this to get better charging, be ready to be disappointed. The problem is not the alternator capability, but the system can't manage the load so the voltage drop in the wiring comes to be the limiting factor. My 80amp will (given the right conditions) top out short term at 96~98 amps, but the single belt would smoke. The big difference is that my coach is a 23 with the house bank in the right front.
Matt
Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES
Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control Arms
SE Michigan - Near DTW - Twixt A2 and Detroit
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| Re: [GMCnet] Alternator Question (just curious) [message #361913 is a reply to message #361907] |
Fri, 22 January 2021 06:57 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
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I just happened to see it and was curious. I have a perfectly good military grade 27si with an isolated ground and a spare. It kust looked very similar.Sent from my U.S.Cellular© Smartphone
-------- Original message --------From: Matt Colie via Gmclist Date: 1/21/21 6:29 PM (GMT-06:00) To: gmclist@list.gmcnet.org Cc: Matt Colie Subject: Re: [GMCnet] Alternator Question (just curious) Ray Erspamer wrote on Thu, 21 January 2021 12:22> Will Delco 24si 165 Amp Alternator work in a GMC?> https://www.jittruckparts.com/delco-remy-delco-remy-24si-160a-alternator-8600310?gclid=CjwKCAiA6aSABhApEiwA6Cbm__nqIvkprmdfyMrcRSX1djiuDAGSov_6Zb3> L9yrw2v6aZeF0WH-zcxoCsgEQAvD_BwE> Sent from my U.S.Cellular© SmartphoneRay, Both this and the OE 27SI are J180 hinge mounts, so that much might bolt on and it is a remote sense for the regulator so that is good. The two issues that bother me are:I could not find my dimensioned drawings of the 27SI to compare, but the front offset might be different so it might be a trick line the belt up. It does not seem to have the tapped hole that is part of the adjustment retention in our installation. If you are doing this because there is no 27SI available, look around a little more. Both the 27SI 80& 100s were produced in massive quantities butdon't buy a 27SI 200, because those are a different frame. If you are doing this to get better charging, be ready to be disappointed. The problem is not the alternator capability, but the system can't managethe load so the voltage drop in the wiring comes to be the limiting factor. My 80amp will (given the right conditions) top out short term at 96~98amps, but the single belt would smoke. The big difference is that my coach is a 23 with the house bank in the right front.Matt -- Matt & Mary Colie - Chaumière -'73 Glacier 23 - Members GMCMI, GMCGL, GMCES Electronically Controlled Quiet Engine Cooling Fan with OE Rear Drum Brakes with Applied Control ArmsSE Michigan - Near DTW - Twixt A2 and Detroit_______________________________________________GMCnet mailing listUnsubscribe or Change List Options:http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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| Re: [GMCnet] Alternator Question (just curious) [message #361919 is a reply to message #361892] |
Fri, 22 January 2021 10:10 |
Scott Nutter
Messages: 782
Registered: January 2015
Location: Houston/San Diego
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Could a local rebuilder bring a 27si up to military specs? And what what would be the difference between the two?
Scott
Scott Nutter
1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, Dave Lenzi super duty mid axle disc brakes, tankless water heater, everything Lenzi. Alex Ferrera installed MSD Atomic EFI
Houston, Texas
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| Re: [GMCnet] Alternator Question (just curious) [message #361920 is a reply to message #361913] |
Fri, 22 January 2021 10:10 |
jhbridges
Messages: 8412
Registered: May 2011
Location: Braselton ga
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We had a couple of pickups which GM had modified to 24 volts using the isolated ground alternator in my unit. Really scary kludge which never worked very well. They ought to work just fine in a 12V system though.
--johnny
Foolish Carriage, 76 26' Eleganza(?) with beaucoup mods and add - ons.
Braselton, Ga.
I forgive them all, save those who hurt the dogs. They must answer to me in hell
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| Re: [GMCnet] Alternator Question (just curious) [message #361933 is a reply to message #361919] |
Fri, 22 January 2021 17:47 |
Ray Erspamer
Messages: 1707
Registered: May 2007
Location: Milwaukee Wisconsin
Karma: -3
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One difference is there's an isolated ground terminal. Sent from my U.S.Cellular© Smartphone
-------- Original message --------From: Scott Nutter via Gmclist Date: 1/22/21 10:11 AM (GMT-06:00) To: gmclist@list.gmcnet.org Cc: Scott Nutter Subject: Re: [GMCnet] Alternator Question (just curious) Could a local rebuilder bring a 27si up to military specs? And what what would be the difference between the two?Scott-- Scott Nutter1978 Royale Center Kitchen, Patterson 455, switch pitch tranny, 3.21 final drive, Quad bags, tankless water heater, everything Lenzi. Alex Ferrerainstalled MSD Atomic EFIHouston, Texas_______________________________________________GMCnet mailing listUnsubscribe or Change List Options:http://list.gmcnet.org/mailman/listinfo/gmclist_list.gmcnet.org
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Ray Erspamer
78 GMC Royale Center Kitchen
403, 3.70 Final Drive
Holley Sniper Quadrajet EFI System,
Holley Hyperspark Ignition System
414-484-9431
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