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

From: Mike Harmuth via Fot <[email-masked]>
Date: Mon, 19 May 2025 08:51:49 -0400

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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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<div dir=3D"ltr">I&#39;m getting tired of replacing the stock type alternat=
ors. They used to last a few seasons but now it seems like a few weekends i=
s the norm.<div><br><div>=C2=A0Like oil, I know there will be many differen=
t opinions, including running without one. That being said, any suggestions=
/part numbers/suppliers of a system that=C2=A0works for you?</div><div><br>=
</div><div>BTW, I enjoyed watching the Jeff 500 last weekend on the VRG liv=
e stream (currently available=C2=A0on YouTube). Nice job against the 911 Mr=
. Frye.</div><div><br></div><div>thanks</div><div>mike h</div></div></div>

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_______________________________________________
[email-masked]

http://www.fot-racing.com

Archive: http://autox.team.net/archive http://www.team.net/pipermail/fot

--===============3904532330274383726==--

---

From: Philip Gott via Fot <[email-masked]>
Date: Mon, 19 May 2025 19:48:58 -0400

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<html><head><meta http-equiv=3D"content-type" content=3D"text/html; charset=3D=
utf-8"></head><body dir=3D"auto">I=E2=80=99ve had great luck with the Small D=
enso unit (35 Amps I believe) used in the Small Kubota tractors such as the B=
X25. This was converted to one wire by the electrical rebuilder shop from wh=
om I purchased the alternator. Puts out a good 14+ volts and keeps the garde=
n tractor battery in my TR4 quite healthy.<div>Yes, it will take a larger di=
ameter Pulley and works well.</div><div>Phil</div><div><br></div><div><br id=
=3D"lineBreakAtBeginningOfSignature"><div dir=3D"ltr">Sent from my iPhone</d=
iv><div dir=3D"ltr"><br><blockquote type=3D"cite">On May 19, 2025, at 6:42=E2=
=80=AFPM, Barr, Scott via Fot &lt;[email-masked]&gt; wrote:<br><br></blo=
ckquote></div><blockquote type=3D"cite"><div dir=3D"ltr">=EF=BB=BF

<meta http-equiv=3D"Content-Type" content=3D"text/html; charset=3Dutf-8">
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<div class=3D"WordSection1">
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">I regularly see 15.7=
.&nbsp; Not for long, but it=E2=80=99s there.<o:p></o:p></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></s=
pan></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Scott (B.)<o:p></o:p=
></span></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt"><o:p>&nbsp;</o:p></s=
pan></p>
<div>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot;=
Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"> Fot &lt;[email-masked]=
t&gt;
<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 &lt;[email-masked]&gt;<br>
<b>Cc:</b> FoTTriumph &lt;[email-masked]&gt;<br>
<b>Subject:</b> Re: [Fot] What alternators are you using on a Spitfire?<o:p>=
</o:p></span></p>
</div>
</div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<p class=3D"MsoNormal">I have a silly question, what voltage do you consider=
 overcharging? &nbsp;My current one charges at over 14v (maybe 14.5v) and wo=
ndered if I should be worried. &nbsp;I=E2=80=99ve done total loss for years a=
nd have just started using an alternator again.<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
<div>
<p class=3D"MsoNormal">Chuck<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><br>
<br>
<o:p></o:p></p>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">On May 19, 2025, at 11=
:29<span style=3D"font-family:&quot;Arial&quot;,sans-serif">=E2=80=AF</span>=
AM, Tony Sheach via Fot &lt;<a href=3D"mailto:[email-masked]">fot@autox.=
team.net</a>&gt; wrote:<o:p></o:p></p>
</blockquote>
</div>
<blockquote style=3D"margin-top:5.0pt;margin-bottom:5.0pt">
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-se=
rif">=EF=BB=BF</span> Hi all
<o:p></o:p></p>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">My experience is that if you are going to use one of t=
hese Nippon Denso derived alternators, you need to go for the OE part.<o:p><=
/o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">The various copies all have short lives, mainly becau=
se the diode set lacks up and usually starts overcharging the battery and ca=
using the output voltage to vary considerably, usually upwards. I=E2=80=99ve=
 had this happen and it=E2=80=99s not pleasant
 when a dry cell battery gets fat enough to pop.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">You can buy diode sets for the original Denso units a=
nd these are a quick change =E2=80=98in the field=E2=80=99 so my view is to b=
uy a decent one and a couple of spare diode packs (the assembly with the spa=
de terminals on the end) and replace as necessary.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I have one 80amp unit that=E2=80=99s done 10 years an=
d is going back in after the current refit. I appreciate that most don=E2=80=
=99t need this sort of output, but it=E2=80=99s usually wet and dark here so=
 it=E2=80=99s everything on. The smaller 45/50 amp units are probably
 longer lived.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Best wishes to all<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Tony&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><o:p>&nbsp;</o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">Sent from my iPhone<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt"><br>
On 19 May 2025, at 16:12, Michael Moore via Fot &lt;<a href=3D"mailto:fot@au=
tox.team.net">[email-masked]</a>&gt; wrote:<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Tahoma&quot;,sans-se=
rif">=EF=BB=BF</span> <o:p>
</o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">Do you have the part=
 number for the powermaster?</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">&nbsp;</span><o:p></=
o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;PPC Handwriting&quot=
;;color:#006600">Have a Good Day</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;PPC Handwriting&quot=
;;color:#006600">Mike</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-family:&quot;Calibri&quot;,sans-s=
erif;color:#006600">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">Michael T. Moore, CPA</=
span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">3255 West 26<sup>th</su=
p> Street</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">Erie, PA 16506</span><o=
:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">&nbsp;</span><o:p></o:p=
></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">Phone:&nbsp; 814-616-86=
52&nbsp; ext 100</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">Fax:&nbsp;&nbsp;&nbsp;&=
nbsp;&nbsp;&nbsp;&nbsp; 888-865-5279</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">Email:&nbsp;&nbsp;&nbsp=
; <a href=3D"mailto:[email-masked]">
<span style=3D"color:#0563C1">[email-masked]</span></a></span><o:p></=
o:p></p>
<p class=3D"MsoNormal"><span style=3D"color:#006600">&nbsp;</span><o:p></o:p=
></p>
<p class=3D"MsoNormal" style=3D"text-autospace:none"><span style=3D"font-siz=
e:9.0pt;font-family:&quot;Times New Roman&quot;,serif;color:black">This elec=
tronic 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 h=
ereby notified that any dissemination, distribution, copying or other use of=
 this message is strictly prohibited and is hereby instructed to notify the s=
ender immediately by return
 email and destroy this copy of this message.</span><o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt;font-family:&quot;Cal=
ibri&quot;,sans-serif;color:#006600">&nbsp;</span><o:p></o:p></p>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<p class=3D"MsoNormal"><span style=3D"font-size:11.0pt">&nbsp;</span><o:p></=
o:p></p>
<div style=3D"border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0in 0=
in 0in">
<p class=3D"MsoNormal"><b><span style=3D"font-size:11.0pt;font-family:&quot;=
Calibri&quot;,sans-serif">From:</span></b><span style=3D"font-size:11.0pt;fo=
nt-family:&quot;Calibri&quot;,sans-serif"> Fot &lt;<a href=3D"mailto:fot-bou=
[email-masked]">[email-masked]</a>&gt;
<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 &lt;<a href=3D"mailto:[email-masked]">ofracer@gma=
il.com</a>&gt;<br>
<b>Cc:</b> FoTTriumph &lt;<a href=3D"mailto:[email-masked]">[email-masked]=
am.net</a>&gt;<br>
<b>Subject:</b> Re: [Fot] What alternators are you using on a Spitfire?</spa=
n><o:p></o:p></p>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal">Mike,<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp; &nbsp; &nbsp; &nbsp;The mini-denso style alter=
nators work great.&nbsp; There is a difference in quality between the cheape=
st, bottom of the barrel options, and the more expensive options.&nbsp;&nbsp=
;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">When my $10 Amazon special failed at VIR last year (h=
ad been in service since 2020), the backup unit I borrowed from Henry Frye l=
ooked identical, but weighed substantially more!&nbsp; There's clearly a dif=
ference.&nbsp;&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Currently, I'm running a powermaster brand and it see=
ms to be well made.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">I also like to run a larger pulley to slow things dow=
n.&nbsp; Here in the states, you can get a 4" pulley sold as Powermaster p/n=
 182.&nbsp; This is a direct swap onto the mini denso.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<div>
<p class=3D"MsoNormal">&lt;image001.jpg&gt;<o:p></o:p></p>
</div>
</div>
<div>
<p class=3D"MsoNormal">&lt;image002.jpg&gt;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">We were also watching the J500 at my house, did you c=
atch the medium bore race, where under full course caution, the commentator s=
houted "Slow down, Henry!".&nbsp; We about fell out of our chairs laughing!<=
o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">Jason Sukey<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">JS Performance Motoring, LLC<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">440.984.7720<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"mailto:[email-masked]" ta=
rget=3D"_blank">[email-masked]</a><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"http://www.jspmparts.com/" target=3D"_blan=
k">www.jspmparts.com</a><o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal"><a href=3D"https://www.facebook.com/JSPerformanceMoto=
ring/" target=3D"_blank">https://www.facebook.com/JSPerformanceMotoring/</a>=
<o:p></o:p></p>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<div>
<p class=3D"MsoNormal">On Mon, May 19, 2025 at 9:01<span style=3D"font-famil=
y:&quot;Arial&quot;,sans-serif">=E2=80=AF</span>AM Mike Harmuth via Fot &lt;=
<a href=3D"mailto:[email-masked]">[email-masked]</a>&gt; wrote:<o:p>=
</o:p></p>
</div>
<blockquote style=3D"border:none;border-left:solid #CCCCCC 1.0pt;padding:0in=
 0in 0in 6.0pt;margin-left:4.8pt;margin-top:5.0pt;margin-right:0in;margin-bo=
ttom:5.0pt">
<div>
<p class=3D"MsoNormal">I'm getting tired of replacing the stock type alterna=
tors. They used to last a few seasons but now it seems like a few weekends i=
s the norm.<o:p></o:p></p>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
<div>
<p class=3D"MsoNormal">&nbsp;Like oil, I know there will be many different o=
pinions, including running without one. That being said, any suggestions/par=
t numbers/suppliers of a system that&nbsp;works for you?<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">BTW, I enjoyed watching the Jeff 500 last weekend on t=
he VRG live stream (currently available&nbsp;on YouTube). Nice job against t=
he 911 Mr. Frye.<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">&nbsp;<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">thanks<o:p></o:p></p>
</div>
<div>
<p class=3D"MsoNormal">mike h<o:p></o:p></p>
</div>
</div>
</div>
<p class=3D"MsoNormal" style=3D"margin-bottom:12.0pt">______________________=
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<o:p></o:p></p>
</blockquote>
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<p class=3D"MsoNormal">&lt;image001.jpg&gt;<o:p></o:p></p>
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<p class=3D"MsoNormal">&lt;image002.jpg&gt;<o:p></o:p></p>
</div>
</div>
</blockquote>
</div>
</div>

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