[Fot] What alternators are you using on a Spitfire?

[GREGORY THOMPSON]

If you go to the Powermaster website, they have a formula to determine the proper alternator you need based on crank pully size and max RPM of your engine. I burned up 2 of the cheap Denso units designed for fork lift use in a year and after installing the Powermaster unit all has been good.
Greg Thompson  

    On Monday, May 19, 2025 at 10:12:47 AM CDT, Michael Moore via Fot <fot at autox.team.net> wrote:  
 
 
Do you have the part number for the powermaster?
 
  
 
Have a Good Day
 
Mike
 
  
 
Michael T. Moore, CPA
 
3255 West 26th Street
 
Erie, PA 16506
 
  
 
Phone:  814-616-8652  ext 100
 
Fax:        888-865-5279
 
Email:    mmoore at mtmcpafirm.com
 
  
 
This electronic mail message contains confidential and legally privileged information intended only for the use of the recipient. If the reader of this message is not the intended recipient, the reader is hereby notified that any dissemination, distribution, copying or other use of this message is strictly prohibited and is hereby instructed to notify the sender immediately by return email and destroy this copy of this message.
 
  
 
  
 
  
 
From: Fot <fot-bounces at autox.team.net>On Behalf Of JS Performance Motoring, LLC via Fot
Sent: Monday, May 19, 2025 10:21 AM
To: Mike Harmuth <ofracer at gmail.com>
Cc: FoTTriumph <fot at autox.team.net>
Subject: Re: [Fot] What alternators are you using on a Spitfire?
 
  
 
Mike,
 
       The mini-denso style alternators work great.  There is a difference in quality between the cheapest, bottom of the barrel options, and the more expensive options.  
 
  
 
When my $10 Amazon special failed at VIR last year (had been in service since 2020), the backup unit I borrowed from Henry Frye looked identical, but weighed substantially more!  There's clearly a difference.  
 
  
 
Currently, I'm running a powermaster brand and it seems to be well made.
 
  
 
I also like to run a larger pulley to slow things down.  Here in the states, you can get a 4" pulley sold as Powermaster p/n 182.  This is a direct swap onto the mini denso.
 
  
 

 

 
  
 
We were also watching the J500 at my house, did you catch the medium bore race, where under full course caution, the commentator shouted "Slow down, Henry!".  We about fell out of our chairs laughing!
 
  
 
  
 
  
 
Jason Sukey
 
JS Performance Motoring, LLC
 
440.984.7720
 
jason at jsperformancemotoring.com
 
www.jspmparts.com
 
https://www.facebook.com/JSPerformanceMotoring/
 
  
 
  
 
On Mon, May 19, 2025 at 9:01 AM Mike Harmuth via Fot <fot at autox.team.net> wrote:
 

I'm getting tired of replacing the stock type alternators. They used to last a few seasons but now it seems like a few weekends is the norm.
 
  
 
 Like oil, I know there will be many different opinions, including running without one. That being said, any suggestions/part numbers/suppliers of a system that works for you?
 
  
 
BTW, I enjoyed watching the Jeff 500 last weekend on the VRG live stream (currently available on YouTube). Nice job against the 911 Mr. Frye.
 
  
 
thanks
 
mike h
 
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