Denso 93 mm alternator installed

Tech tips and how to's

Moderators: garth, notoptoy, S Allen

User avatar
fj20spl311
Roadsteraholic
Posts: 4848
Joined: Mon Nov 28, 2005 3:54 pm
Location: San Diego, Ca

Re: Denso 93 mm alternator installed

Post by fj20spl311 » Thu May 17, 2018 4:27 pm

its VERY small, so it can be installed on the drivers side, but the details have not been published. Its so small, the heat may not be an issue.
You can do it......
So you can keep you AC compressor?.....LOL
Phil
67.5 SRL311-00148 Blue (FJ cruiser VOODOO Blue)
67.5 SPL311 FJ20E teal SDS EFI
69 SRL311 FJ20ET Yellow SDS EFI

Toptech360
Roadsteraholic
Posts: 660
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Denso 93 mm alternator installed

Post by Toptech360 » Thu May 17, 2018 9:36 pm

ppeters914 wrote:
Thu May 17, 2018 3:13 pm
I believe the Denso and GM alt installs are similar. The GM alt upgrade is not limited to Datsuns. Google GM 3-wire alternator to find quite a few posts, pics, drawings, and YouTube videos. Here's mine (click image to get larger view).
  • Lester Part No. 7127-3, 63A
  • Terminal #2 Sensing (red wire) attached to insulated BAT post on alternator, same post that you connect another wire to POS (+) of battery.
  • Terminal #1 Field (black wire) not connected and taped off.
gm_alt1 (Medium).jpg

gm_alt2 (Medium).jpg
Your right the denso and Delco do wire up the same EXCEPT that you need to hook terminal 2 sensing wire to a key on 12v source other wise the the denso will think it's always "on" if hooked to a constant power and will cause a parasitic drain.
You do not have the required permissions to view the files attached to this post.
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
Linda
Roadster Enthusiast
Posts: 6951
Joined: Sat Nov 05, 2005 11:37 pm
Location: Los Angeles
Model: 1500/1600
Year: High Windshield-68-70

Re: Denso 93 mm alternator installed

Post by Linda » Thu May 17, 2018 10:15 pm

Phil,
My alt is good and I have a spare, but having a brand new , not rebuilt alt that is cheap enough and I can put in the same spot is appealing. At least to put on my ToDo list :)
Linda
68 1600
Los Angeles, CA
Tech Wiki->Parts->Parts Interchange
Archives has it all

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2923
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Denso 93 mm alternator installed

Post by ppeters914 » Fri May 18, 2018 1:39 pm

Linda wrote:
Thu May 17, 2018 3:36 pm
Could this alt be installed on the driver's side? I actually like the left side mount despite the heat.
Linda
The Datsun Roadster Book™, Part II, Pages 115-117 discusses the GM alt, including a pic of a GM alt installed on the driver's (left) side of the engine.
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans
A couple of Porsches, a pickup, and a motorcycle

greydog
Roadster Fanatic-Site Supporter
Posts: 1565
Joined: Sat Nov 21, 2009 11:37 pm
Location: Vancouver, Washington

Re: Denso 93 mm alternator installed

Post by greydog » Fri May 18, 2018 6:47 pm

The Denso would fit easily and get more air flow. Might not cook over time.
Dan
.68 SRL311 aka "Skortch". On the road again.
'69 SPL311 aka "Scooter" terrorizing the streets
1990 Nissan 300ZX
2008 VW GTI
2017 VW Passat

GoldHawg
Roadster Fanatic
Posts: 367
Joined: Sun Jul 30, 2006 3:27 pm
Location: Spring Valley, OH

Re: Denso 93 mm alternator installed

Post by GoldHawg » Sat May 19, 2018 6:05 am

More alternator info than my mind can process, but very thorough can be found here:
http://www.pirate4x4.com/tech/billavista/Wiring/Part2/

JT68
Talented Enthusiast
Posts: 1791
Joined: Sun Jan 27, 2013 9:43 am
Location: Cumming, GA

Re: Denso 93 mm alternator installed

Post by JT68 » Fri May 25, 2018 3:59 pm

Here is the entire Right-Hand Kit:

https://www.datsunrestorationproducts.c ... nt-for-u20

If you are good with electrical items you can be charging in 15 or 20 minutes total. Fully tested prior to shipping!
JT/LT
Datsunrestorationproducts.com
The very finest parts for your 311!

Toptech360
Roadsteraholic
Posts: 660
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Denso 93 mm alternator installed

Post by Toptech360 » Wed Aug 01, 2018 11:01 pm

We'll folks it's been a few months since I have installed the ebay Kubota/denso alternator. I wanted to update the thread a bit.

So far I have had zero issues. This is a slick setup and because of its small size it looks like the alternator belongs under the hood. I've driven the car a few times now along several long stretches topping out around 90mph at near 6000 engine crank rpm and the alternator doesn't seem to care about high rpm at all. Most of the time I cruise between 3200 to 4000rpm which is probably 8000 to 10,000+ alternator rpm and again, no problems or quirks to report.

That is all. Thank you
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
Linda
Roadster Enthusiast
Posts: 6951
Joined: Sat Nov 05, 2005 11:37 pm
Location: Los Angeles
Model: 1500/1600
Year: High Windshield-68-70

Re: Denso 93 mm alternator installed

Post by Linda » Fri May 10, 2019 8:48 pm

Hey Dan
Glad your set up is working well. I got tired of the VRs and the stock set up not working right or for long, so in process with a similar right hand alt that is smaller. Just trying to work out the hardware .
Linda
68 1600
Los Angeles, CA
Tech Wiki->Parts->Parts Interchange
Archives has it all

User avatar
ppeters914
Roadster Fanatic-Site Supporter
Posts: 2923
Joined: Mon Jun 28, 2004 5:51 pm
Location: Lake Forest Park, WA (just north of Seattle)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Denso 93 mm alternator installed

Post by ppeters914 » Fri May 10, 2019 10:01 pm

Yeah, too bad Jim doesn't have a kit for us R16 folks.

Darn U20 snobs! j/k
Pete
-------------------------------------
'67 1600 - frame off in progress. What a stupid idea. :smt021
'66 1600 - parts car
'66 WPL411 - no engine or trans
A couple of Porsches, a pickup, and a motorcycle

JT68
Talented Enthusiast
Posts: 1791
Joined: Sun Jan 27, 2013 9:43 am
Location: Cumming, GA

Re: Denso 93 mm alternator installed

Post by JT68 » Fri May 10, 2019 11:55 pm

Hah, Funny you should mention it, we just finished a kit for RH 68-70 use. May do a Denso kit for 68-70 too, but the pulley offset is not quite correct so requires a different spacer set. I’ll do some photos and put it up on the webpage soon. Feel free to pm or email if you need one// j
JT/LT
Datsunrestorationproducts.com
The very finest parts for your 311!

Toptech360
Roadsteraholic
Posts: 660
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Denso 93 mm alternator installed

Post by Toptech360 » Sat May 11, 2019 2:03 pm

Linda wrote:
Fri May 10, 2019 8:48 pm
Hey Dan
Glad your set up is working well. I got tired of the VRs and the stock set up not working right or for long, so in process with a similar right hand alt that is smaller. Just trying to work out the hardware .
Linda
My father in law had a GM alt conversion done many years ago, it looked like the alternator mount (on distributor side of engine) had been shortened and also a different (unknown) adjusting arm/top mount was used to make the conversion work. The denso alternator is essentially identical to the GM as far as the mounting goes. It was almost a direct bolt in for converting from the GM to the denso. I had to use a shorter drive belt but otherwise that was about it.

By the way still working with no issues! It's been one of my favorite "mods" I've done to the car.
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.

User avatar
Linda
Roadster Enthusiast
Posts: 6951
Joined: Sat Nov 05, 2005 11:37 pm
Location: Los Angeles
Model: 1500/1600
Year: High Windshield-68-70

Re: Denso 93 mm alternator installed

Post by Linda » Sat May 11, 2019 3:00 pm

That would work if you went from GM to Denso, but starting from scratch would be different.
Any ideas on "arm" used?
Linda
68 1600
Los Angeles, CA
Tech Wiki->Parts->Parts Interchange
Archives has it all

User avatar
S Allen
Site Admin
Posts: 3904
Joined: Thu Dec 05, 2002 4:57 pm
Location: Knoxville, IA(Lake Redrock)Antioch, CA(Winter Months)
Model: 1500/1600
Year: Low Windshield-64-67.5

Re: Denso 93 mm alternator installed

Post by S Allen » Sun May 12, 2019 9:54 am

Toptech-is it okay to pull the pertinent info and get it added to the tech wiki? Thanks.

Steve
66 Stroker-Viper Blue Eventually
67.5 Stroker-Purple
67 SRL311-00279-resto project
Stock '72 240Z-Blue
2002 Ford F250 7.3 Diesel 2WD Hauler
2008 Toyota FJ Cruiser
2009 Smart ForTwo Passion Coupe
2013 Fiat 500 Abarth

Toptech360
Roadsteraholic
Posts: 660
Joined: Mon Oct 28, 2013 1:59 pm
Location: Bellingham, Washington

Re: Denso 93 mm alternator installed

Post by Toptech360 » Sun May 12, 2019 11:38 am

S Allen wrote:
Sun May 12, 2019 9:54 am
Toptech-is it okay to pull the pertinent info and get it added to the tech wiki? Thanks.

Steve
Yes of course. If I can help with anything else let me know.
Dan
1964 Datsun SPL310. The Datsun
1997 Toyota Tacoma LX 4wd. The Truck
2009 Subaru Forester XT.
2017 Toyota AWD Swagger Wagon.