<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto">I’ve had great luck with the Small Denso unit (35 Amps I believe) used in the Small Kubota tractors such as the BX25. This was converted to one wire by the electrical rebuilder shop from whom I purchased the alternator. Puts out a good 14+ volts and keeps the garden tractor battery in my TR4 quite healthy.<div>Yes, it will take a larger diameter Pulley and works well.</div><div>Phil</div><div><br></div><div><br id="lineBreakAtBeginningOfSignature"><div dir="ltr">Sent from my iPhone</div><div dir="ltr"><br><blockquote type="cite">On May 19, 2025, at 6:42 PM, Barr, Scott via Fot <fot@autox.team.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">
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<p class="MsoNormal"><span style="font-size:11.0pt">I regularly see 15.7. Not for long, but it’s there.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt">Scott (B.)<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Fot <fot-bounces@autox.team.net>
<b>On Behalf Of </b>Chuck Gee via Fot<br>
<b>Sent:</b> Monday, May 19, 2025 4:52 PM<br>
<b>To:</b> Tony Sheach <tony.sheach@live.co.uk><br>
<b>Cc:</b> FoTTriumph <fot@autox.team.net><br>
<b>Subject:</b> Re: [Fot] What alternators are you using on a Spitfire?<o:p></o:p></span></p>
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<p class="MsoNormal">I have a silly question, what voltage do you consider overcharging? My current one charges at over 14v (maybe 14.5v) and wondered if I should be worried. I’ve done total loss for years and have just started using an alternator again.<o:p></o:p></p>
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<p class="MsoNormal">Chuck<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt">On May 19, 2025, at 11:29<span style="font-family:"Arial",sans-serif"> </span>AM, Tony Sheach via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-family:"Tahoma",sans-serif"></span> Hi all
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<p class="MsoNormal">My experience is that if you are going to use one of these Nippon Denso derived alternators, you need to go for the OE part.<o:p></o:p></p>
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<p class="MsoNormal">The various copies all have short lives, mainly because the diode set lacks up and usually starts overcharging the battery and causing the output voltage to vary considerably, usually upwards. I’ve had this happen and it’s not pleasant
when a dry cell battery gets fat enough to pop.<o:p></o:p></p>
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<p class="MsoNormal">You can buy diode sets for the original Denso units and these are a quick change ‘in the field’ so my view is to buy a decent one and a couple of spare diode packs (the assembly with the spade terminals on the end) and replace as necessary.<o:p></o:p></p>
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<p class="MsoNormal">I have one 80amp unit that’s done 10 years and is going back in after the current refit. I appreciate that most don’t need this sort of output, but it’s usually wet and dark here so it’s everything on. The smaller 45/50 amp units are probably
longer lived.<o:p></o:p></p>
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<p class="MsoNormal">Best wishes to all<o:p></o:p></p>
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<p class="MsoNormal">Tony <o:p></o:p></p>
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<p class="MsoNormal">Sent from my iPhone<o:p></o:p></p>
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On 19 May 2025, at 16:12, Michael Moore via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:11.0pt">Do you have the part number for the powermaster?</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-size:11.0pt"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"PPC Handwriting";color:#006600">Have a Good Day</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"PPC Handwriting";color:#006600">Mike</span><o:p></o:p></p>
<p class="MsoNormal"><span style="font-family:"Calibri",sans-serif;color:#006600"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600">Michael T. Moore, CPA</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600">3255 West 26<sup>th</sup> Street</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600">Erie, PA 16506</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600"> </span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600">Phone: 814-616-8652 ext 100</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600">Fax: 888-865-5279</span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600">Email: <a href="mailto:mmoore@mtmcpafirm.com">
<span style="color:#0563C1">mmoore@mtmcpafirm.com</span></a></span><o:p></o:p></p>
<p class="MsoNormal"><span style="color:#006600"> </span><o:p></o:p></p>
<p class="MsoNormal" style="text-autospace:none"><span style="font-size:9.0pt;font-family:"Times New Roman",serif;color:black">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.</span><o:p></o:p></p>
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<p class="MsoNormal"><b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Fot <<a href="mailto:fot-bounces@autox.team.net">fot-bounces@autox.team.net</a>>
<b>On Behalf Of </b>JS Performance Motoring, LLC via Fot<br>
<b>Sent:</b> Monday, May 19, 2025 10:21 AM<br>
<b>To:</b> Mike Harmuth <<a href="mailto:ofracer@gmail.com">ofracer@gmail.com</a>><br>
<b>Cc:</b> FoTTriumph <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>><br>
<b>Subject:</b> Re: [Fot] What alternators are you using on a Spitfire?</span><o:p></o:p></p>
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<p class="MsoNormal">Mike,<o:p></o:p></p>
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<p class="MsoNormal"> 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. <o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">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. <o:p></o:p></p>
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<p class="MsoNormal">Currently, I'm running a powermaster brand and it seems to be well made.<o:p></o:p></p>
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<p class="MsoNormal"> <o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">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!<o:p></o:p></p>
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<p class="MsoNormal">Jason Sukey<o:p></o:p></p>
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<p class="MsoNormal">JS Performance Motoring, LLC<o:p></o:p></p>
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<p class="MsoNormal">440.984.7720<o:p></o:p></p>
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<p class="MsoNormal"><a href="mailto:jason@jsperformancemotoring.com" target="_blank">jason@jsperformancemotoring.com</a><o:p></o:p></p>
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<p class="MsoNormal"><a href="http://www.jspmparts.com/" target="_blank">www.jspmparts.com</a><o:p></o:p></p>
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<p class="MsoNormal"><a href="https://www.facebook.com/JSPerformanceMotoring/" target="_blank">https://www.facebook.com/JSPerformanceMotoring/</a><o:p></o:p></p>
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<p class="MsoNormal">On Mon, May 19, 2025 at 9:01<span style="font-family:"Arial",sans-serif"> </span>AM Mike Harmuth via Fot <<a href="mailto:fot@autox.team.net">fot@autox.team.net</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal"> 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?<o:p></o:p></p>
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<p class="MsoNormal">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.<o:p></o:p></p>
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<p class="MsoNormal">thanks<o:p></o:p></p>
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<p class="MsoNormal">mike h<o:p></o:p></p>
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