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Hank,
We may be going down that rabbit hole I mentioned before. Based on the
picture you sent it looks like BN1 and BN2 pulley is for an SAE 7/8 or 28
series (7/8 x 32) series belt. The dimensions of the pulley for the 7/8
belt are:
Effective Groove Width - 0.785"
Groove Angle 34 deg
Groove Depth Min. - 0.709"
Rideout - 0.090" +/- 0.045"
Google "28445 Automotive cogged Belt" and you should see something close.
Since you have a loose pulley may I suggest a trip to a good auto supply
store and see how a 28 series belt fits the pulley you have.
I looked at the belt on the AH Spares website. I will suggest that given
the size of the belt a cogged belt is a better option to more easily turn
around the pulleys. The markings on the AHS belt are a bit of a red herring=
.
Hope this helps,
Harold
On Sun, Mar 23, 2025 at 12:55=E2=80=AFPM Hank Leach <gradea1@charter.net> w=
rote:
> Just went back to the AH Spares site and looked at the actual listing for
> the 100 belt. It has rideout and appears to be the correct fit.(photos
> from site) Their notes as follows:
>
> Austin Healey Fan Belt | 3/4-Inch Pulley | BN1 to BN2
>
> "We have had these belts made to the correct O.E. 3/4 inch width unlike
> the reproductions available which sit to low in the pulleys making them
> less efficient and noisy."
>
>
> OE part number:
> 2H4238
> Application:
> BN1 - BN2
>
> Looks like*, if I can afford the shipping charge*, I should get one of
> these correct fitting belts. It even has the correct part number stamped
> to satisfy concours questions. Hank
>
> --------------------
>
> From: "Harold Manifold" <manifold@telus.net>
> To: <gradea1@charter.net>
> Cc: "Michael Salter" <michaelsalter@gmail.com>, "Healeys at Autox" <
> healeys@autox.team.net>
> Sent: March 23, 2025 at 11:49 AM PDT
> Subject: Re: Re: [Healeys] Correct V-belt
> Hank et al,
>
> I am not familiar with the pulleys on the BN1 and BN2 other than I have
> been told they are wider than both the 3/8" and 1/2" pulleys on the later
> Healeys. If someone out there has a pulley from a 100 and can measure the
> Effective Groove Width (the width at the top of the pulley) and the groov=
e
> angle (it should be close to 34 deg.) I can determine the right series of
> belt. Length is more difficult.
>
> I will use my 45 year old SAE manuals as opposed to AI.
>
> Harold
>
>
>
> On Sun, Mar 23, 2025 at 11:37=E2=80=AFAM Hank Leach <gradea1@charter.net>=
wrote:
>
>> Harold-thank you! great article and completely understandable and useful=
.
>> Now do you have anything about the monster V-belt on the 100? I think t=
hat
>> is the belt both Michaels are talking about. This one is really hard to
>> find, massive and often fitted wrongly thus eating up generator bearings=
.
>> It was made to be mounted on the original truck(lorry) version 6 cylinde=
r
>> engine and carried over when the 4 (2660cc) was cut down and manufacture=
d.
>> I had nothing but pulley problems during my restoration. Would love to h=
ave
>> a number for this one. Original belt part number 2H4238 fitting pulleys
>> 1B1057 crank;1B1024 WP and 1B1727 dynamo. FYI AH Spares says this is th=
e
>> belt:
>> *CHT137
>> <https://www.ahspares.co.uk/austin-healey/big-healey/cooling-heating-cht=
101-to-cht147/fan-belt.aspx>* *Fan
>> Belt - Correct 3/4" Width
>> <https://www.ahspares.co.uk/austin-healey/big-healey/cooling-heating-cht=
101-to-cht147/fan-belt.aspx>* 3/4"
>> wide. Moss has "original type" 021-066
>> Regards, Hank
>> --------------------
>>
>> From: "Harold Manifold" <manifold@telus.net>
>> To: "Michael Salter" <michaelsalter@gmail.com>
>> Cc: "Healeys at Autox" <healeys@autox.team.net>
>> Sent: March 23, 2025 at 9:57 AM PDT
>> Subject: Re: [Healeys] Correct V-belt
>> Michael,
>>
>> I want to save you from falling down the fan belt rabbit hole. A couple
>> of years ago I wrote the attached article for our club magazine. It shou=
ld
>> help to give you a clear path forward.
>>
>> Harold
>>
>> On Sun, Mar 23, 2025 at 6:17=E2=80=AFAM Michael Salter <michaelsalter@gm=
ail.com>
>> wrote:
>>
>>> Michael, as I recall you are running an alternator on your 100. Has th=
e
>>> original 100 generator pulley been fitted to the alternator, as the
>>> original alternator pulley would definitely require a totally different
>>> belt than would be correct for the 100 pulleys?
>>>
>>> On Sat., Mar. 22, 2025, 8:19 p.m. Michael Oritt, <
>>> michael.oritt@gmail.com> wrote:
>>>
>>>> I went to the NAPA store today to get a V-belt and was sold a smooth
>>>> belt with an FH (Fractional Horsepower) designation.
>>>> The packaging said it was for lawn and household applications of less
>>>> than 1 HP.
>>>> I asked the sales clerk if an FH belt was suitable for automotive use
>>>> and was told "Yes".
>>>> Now I see that Google AI says no--that such a belt is [i]not[/i]
>>>> suitable for cars.
>>>> Who is right--AI or NAPA and if not FH which designation is correct?
>>>>
>>>> Best--Michael Oritt
>>>>
>>>> _______________________________________________
>>>> Support Team.Net http://www.team.net/donate.html
>>>> Suggested annual donation $12.75
>>>>
>>>> Archive: http://www.team.net/pipermail/healeys
>>>> http://autox.team.net/archive/healeys
>>>>
>>>> Healeys@autox.team.net
>>>> http://autox.team.net/mailman/listinfo/healeys
>>>>
>>>> Unsubscribe/Manage:
>>>> http://autox.team.net/mailman/options/healeys/michaelsalter@gmail.com
>>>>
>>>> _______________________________________________
>>> Support Team.Net http://www.team.net/donate.html
>>> Suggested annual donation $12.75
>>>
>>> Archive: http://www.team.net/pipermail/healeys
>>> http://autox.team.net/archive/healeys
>>>
>>> Healeys@autox.team.net
>>> http://autox.team.net/mailman/listinfo/healeys
>>>
>>> Unsubscribe/Manage:
>>> http://autox.team.net/mailman/options/healeys/manifold@telus.net
>>>
>>>
>>
>
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<div dir=3D"ltr">Hank,<div><br></div><div>We may be going down that rabbit=
=C2=A0hole I mentioned before. Based on the picture you sent it looks like =
BN1 and BN2 pulley is for an SAE 7/8 or 28 series (7/8 x 32) series belt. T=
he dimensions of the pulley for the 7/8 belt are:</div><div>Effective Groov=
e Width - 0.785"</div><div>Groove Angle 34 deg</div><div>Groove Depth =
Min. - 0.709"</div><div>Rideout - 0.090"=C2=A0<a class=3D"gmail_p=
lusreply" id=3D"plusReplyChip-0">+/- 0.045"</a></div><div><a class=3D"=
gmail_plusreply"><br></a></div><div>Google "28445 Automotive cogged Be=
lt" and you should see something close. Since you have a loose pulley =
may I suggest a trip to a good auto supply store and see how a 28 series be=
lt fits the pulley you have.</div><div><br></div><div>I looked at the belt =
on the AH Spares website. I will suggest that given the size of the belt a =
cogged belt is a better option to more easily turn around the pulleys. The =
markings on the AHS belt are a bit of a red herring.</div><div><br></div><d=
iv>Hope this helps,</div><div>Harold</div><div><br><a class=3D"gmail_plusre=
ply"><br></a></div></div><br><div class=3D"gmail_quote gmail_quote_containe=
r"><div dir=3D"ltr" class=3D"gmail_attr">On Sun, Mar 23, 2025 at 12:55=E2=
=80=AFPM Hank Leach <<a href=3D"mailto:gradea1@charter.net";>gradea1@char=
ter.net</a>> wrote:<br></div><blockquote class=3D"gmail_quote" style=3D"=
margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-lef=
t:1ex"><div>Just went back to the AH Spares site and looked at the actual l=
isting for the 100 belt.<span style=3D"text-decoration:underline"> It has r=
ideout</span> and appears to be the correct fit.(photos from site) Their no=
tes as follows:</div>
<div>
<div>
<div>
<p>Austin Healey Fan Belt | 3/4-Inch Pulley | BN1 to BN2</p>
<p>"We have had these belts made to the correct O.E. 3/4 inch width un=
like the reproductions available which sit to low in the pulleys making the=
m less efficient and noisy."</p>
<p>=C2=A0</p>
</div>
</div>
<div>
<div>OE part number:</div>
<div>2H4238</div>
</div>
<div>
<div>Application:</div>
<div>BN1 - BN2</div>
<div>=C2=A0</div>
<div>Looks like<em>, if I can afford the shipping charge</em>, I should get=
one of these correct fitting belts.=C2=A0 It even has the correct part num=
ber stamped to satisfy concours questions. Hank</div>
</div>
<br>-------------------- <br><br>From: "Harold Manifold" <<a h=
ref=3D"mailto:manifold@telus.net"; target=3D"_blank">manifold@telus.net</a>&=
gt; <br>To: <<a href=3D"mailto:gradea1@charter.net"; target=3D"_blank">gr=
adea1@charter.net</a>> <br>Cc: "Michael Salter" <<a href=3D=
"mailto:michaelsalter@gmail.com"; target=3D"_blank">michaelsalter@gmail.com<=
/a>>, "Healeys at Autox" <<a href=3D"mailto:healeys@autox.t=
eam.net" target=3D"_blank">healeys@autox.team.net</a>> <br>Sent: March 2=
3, 2025 at 11:49 AM PDT <br>Subject: Re: Re: [Healeys] Correct V-belt </div=
>
<div>Hank et al,
<div>=C2=A0</div>
<div>I am not familiar=C2=A0with the pulleys on the BN1 and BN2 other than =
I have been told they are wider than both the 3/8" and 1/2" pulle=
ys on the later Healeys. If someone out there has a pulley from a 100 and c=
an measure the Effective Groove Width (the width at the top of the pulley) =
and the groove angle (it should be close to 34 deg.) I can determine the ri=
ght series of belt. Length is more difficult.</div>
<div>=C2=A0</div>
<div>I will use my 45 year old SAE manuals as opposed to AI.</div>
<div>=C2=A0</div>
<div>Harold</div>
<div>=C2=A0</div>
<div>=C2=A0</div>
</div>
<div>=C2=A0</div>
<div class=3D"gmail_quote">
<div class=3D"gmail_attr">On Sun, Mar 23, 2025 at 11:37=E2=80=AFAM Hank Lea=
ch <<a href=3D"mailto:gradea1@charter.net"; target=3D"_blank">gradea1@cha=
rter.net</a>> wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div>Harold-thank you! great article and completely understandable and usef=
ul. Now do you have anything about the monster V-belt on the 100?=C2=A0 I t=
hink that is the belt both Michaels are talking about. This one is really h=
ard to find, massive and often fitted wrongly thus eating up generator bear=
ings. It was made to be mounted on the original truck(lorry) version 6 cyli=
nder engine and carried over when the 4 (2660cc) was cut down and manufactu=
red. I had nothing but pulley problems during my restoration. Would love to=
have a number for this one. Original belt part number 2H4238 fitting pulle=
ys 1B1057 crank;1B1024 WP and=C2=A0 1B1727 dynamo. FYI AH Spares says this =
is the belt:=C2=A0
<table id=3D"m_-8934612855065464866m_5584014619263123253ctl00_ContentPlaceH=
older_dgProducts" border=3D"1" cellspacing=3D"0" cellpadding=3D"5">
<tbody>
<tr>
<td><strong><a href=3D"https://www.ahspares.co.uk/austin-healey/big-healey/=
cooling-heating-cht101-to-cht147/fan-belt.aspx" rel=3D"noopener" target=3D"=
_blank">CHT137</a></strong></td>
<td><strong><a href=3D"https://www.ahspares.co.uk/austin-healey/big-healey/=
cooling-heating-cht101-to-cht147/fan-belt.aspx" rel=3D"noopener" target=3D"=
_blank">Fan Belt - Correct 3/4" Width</a></strong></td>
</tr>
</tbody>
</table>
=C2=A03/4" wide.=C2=A0 Moss has "original type" 021-066</div=
>
<div>Regards, Hank<br>-------------------- <br><br>From: "Harold Manif=
old" <<a href=3D"mailto:manifold@telus.net"; rel=3D"noopener" target=
=3D"_blank">manifold@telus.net</a>> <br>To: "Michael Salter" &=
lt;<a href=3D"mailto:michaelsalter@gmail.com"; rel=3D"noopener" target=3D"_b=
lank">michaelsalter@gmail.com</a>> <br>Cc: "Healeys at Autox" =
<<a href=3D"mailto:healeys@autox.team.net"; rel=3D"noopener" target=3D"_b=
lank">healeys@autox.team.net</a>> <br>Sent: March 23, 2025 at 9:57 AM PD=
T <br>Subject: Re: [Healeys] Correct V-belt</div>
<div>Michael,
<div>=C2=A0</div>
<div>I want to save you from falling down the fan belt rabbit hole. A coupl=
e of years ago I wrote the attached article for our club magazine. It shoul=
d=C2=A0 help to give you a clear path forward.</div>
<div>=C2=A0</div>
<div>Harold</div>
</div>
<div>=C2=A0</div>
<div class=3D"gmail_quote">
<div class=3D"gmail_attr">On Sun, Mar 23, 2025 at 6:17=E2=80=AFAM Michael S=
alter <<a href=3D"mailto:michaelsalter@gmail.com"; rel=3D"noopener" targe=
t=3D"_blank">michaelsalter@gmail.com</a>> wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div>Michael,=C2=A0 as I recall you are running an alternator on your 100. =
Has the original 100 generator pulley been fitted to the alternator, as the=
original alternator pulley would definitely require a totally different be=
lt than would be correct for the 100 pulleys?</div>
<br>
<div class=3D"gmail_quote">
<div class=3D"gmail_attr">On Sat., Mar. 22, 2025, 8:19 p.m. Michael Oritt, =
<<a href=3D"mailto:michael.oritt@gmail.com"; rel=3D"noopener" target=3D"_=
blank">michael.oritt@gmail.com</a>> wrote:</div>
<blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px 0.8ex;border-=
left:1px solid rgb(204,204,204);padding-left:1ex">
<div>
<div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">I went to the N=
APA store today to get a V-belt and was sold a smooth belt with an FH (Frac=
tional Horsepower) designation.<br>The packaging said it was for lawn and h=
ousehold applications of less than 1 HP. =C2=A0<br>I asked the sales clerk =
if an FH belt was suitable for automotive use and was told "Yes".=
=C2=A0<br>Now I see that Google AI says no--that such a belt is [i]not[/i]=
suitable for cars. =C2=A0<br>Who is right--AI or NAPA and if not FH which =
designation is correct?</div>
<div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">=C2=A0</div>
<div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">Best--Michael O=
ritt</div>
<div class=3D"gmail_default" style=3D"color:rgb(51,51,255)">=C2=A0</div>
</div>
_______________________________________________<br>Support Team.Net <a href=
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<br></blockquote>
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</blockquote>
</div></blockquote></div>
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