<html><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body dir="auto"><div dir="ltr"></div><div dir="ltr">Begs the question: Anyone make an aftermarket balancer for the 100s? Without looking, I think there’s enough room for one.</div><div dir="ltr"><br><blockquote type="cite">On Oct 30, 2021, at 10:17 AM, Henry G Leach via Healeys <healeys@autox.team.net> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr">The "weakness" in the original 100, A-90 crankshaft was the lack of a harmonic balancer, coupled with a huge heavy flywheel.  More than likely, the crank that was sought after for replacement, had cracks near the rear main area where it vibrated itself to death. A case for not revving the engine over 4000 rpms. (Donald Healey set strict orders for all his racers to keep the revs down).<div><br></div><div>They (BMC) fixed all that, or should I say Morris Motors, fixed it by adding the harmonic balancer to the early 100-6 engine.  Too bad they lost points in other areas, but by the time the 2912cc engine was developed, they did in fact fix all that...best six made!  Hank<br><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "David Porter via Healeys" <healeys@autox.team.net><br>To: "Michael MacLean", "healeys@autox.team.net"<br>Cc: <br>Sent: Saturday October 30 2021 4:20:15AM<br>Subject: Re: [Healeys] Crankshaft<br><br>
<p dir="ltr"><font face="Calibri">Don't over think this. Just
because it will rev much better doesn't mean it gets used all the
time, but it's there. Of course the addition of other lighter bits
and an AL head and expensive harmonic balancer will have you at a
greater expense. Speed costs money, how fast do you want to go?.
The AH four makes excellent bottom end torque. The huge main caps
handle it just fine. The original crank is the weak link.
DP</font></p>
<font face="Calibri"><br><br>
On October 30, 2021, at 3:22 AM, Michael MacLean via Healeys
<healeys@autox.team.net> wrote:<br><br><br></font>
<div dir="ltr">
<div>Wouldn't you have to beef up the main caps and add straps
across them to handle the crank in higher RPM?  Just a thought
with only 3 main bearings and no harmonic balancer.<br></div>
<div>Mike MacLean<br></div>
</div>
<br><div class="gmail_quote">
<div dir="ltr" class="gmail_attr">On Fri, Oct 29, 2021 at 8:48 PM
WILLIAM B LAWRENCE via Healeys <<a>healeys@autox.team.net</a>>
wrote:<br></div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px .8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<div>I’d say it doesn’t transform the engine by itself, but it
provides a stronger basis for the other mods that will.</div>
<div><br></div>
<div>Bill Lawrence</div>
<div>BN1 #554</div>
<hr style="width:98%;"><div dir="ltr">
<font style="font-size:11pt;" face="Calibri, sans-serif" color="#000000"><b>From:</b> Healeys <<a>healeys-bounces@autox.team.net</a>> on behalf of Bob
Spidell via Healeys <<a>healeys@autox.team.net</a>><br><b>Sent:</b> Saturday, October 30, 2021 1:16 AM<br><b>To:</b> richard mayor <<a>boyracer466@gmail.com</a>><br><b>Cc:</b> <a>healeys@autox.team.net</a> <<a>healeys@autox.team.net</a>><br><b>Subject:</b> Re: [Healeys] Crankshaft</font>
<div> </div>
</div>
<div>
<div dir="ltr"></div>
<div dir="ltr">Does it de-stroke the engine (shorter throws)?</div>
<div dir="ltr"><br></div>
<div dir="ltr"><br><blockquote>On Oct 29, 2021, at 5:05 PM, richard mayor
via Healeys <<a>healeys@autox.team.net</a>> wrote:<br><br></blockquote>
</div>
<blockquote>
<div dir="ltr">
<div dir="ltr">But a lightened flywheel will get you there
quicker.<br></div>
<br><div>
<div dir="ltr">On Fri, Oct 29, 2021 at 3:19 PM Michael Salter via
Healeys <<a>healeys@autox.team.net</a>> wrote:<br></div>
<blockquote style="margin:0px 0px 0px .8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>David, how does changing the crankshaft give you
2000 additional RPM?
<div>Lighter rods and pistons, balancing, cam timing,
bigger valves, porting, bigger carbs,  shorter stroke, even
increased compression may all contribute to higher RPM but a crank
alone will not make any difference, neither will a lightened
flywheel. </div>
<div>M</div>
</div>
<br><div>
<div dir="ltr">On Fri., Oct. 29, 2021, 6:03 p.m. David P via
Healeys, <<a>healeys@autox.team.net</a>> wrote:<br></div>
<blockquote style="margin:0px 0px 0px .8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
<div>
<p>lighter, stronger, 2000+ additional rpms ,add a wee bit of cam
and its a stormer and looks dead stock.. add a real seal and go
have some fun.  As I said IMHO.. It ain't cheap. dp  I
understand one is going on BAT in the near future. Black over
red..<br></p>
<div>On 10/29/2021 3:25 PM, Michael Salter via Healeys
wrote:<br></div>
<blockquote>
<div>Confirmation bias is a very powerful force.
<div><br></div>
<div>M</div>
</div>
<br><div>
<div dir="ltr">On Fri., Oct. 29, 2021, 3:35 p.m. Bob Spidell via
Healeys, <<a>healeys@autox.team.net</a>>
wrote:<br></div>
<blockquote style="margin:0px 0px 0px .8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex;">
OK, I'll bite: How does a Welch crank transform a a 100? I get
that<br>
they're steel and stronger, and should withstand more RPM/HP, but
does<br>
the crank alone do it?<br><br>
Bob<br><br>
On 10/29/2021 8:10 AM, David P via Healeys wrote:<br>
><br>
> pretty much hen's teeth is my guess. But a Welsh crank, it
transforms<br>
> the engine. IMHO  I'm sure Donald wishes they were
available in '54<br>
><br>
> On 10/28/2021 2:29 PM, Robert Memler via Healeys wrote:<br>
>> I need a crankshaft for a 54 b;no. Does anyone have a
spare that they<br>
>> would be willing to sell?<br>
>><br>
>> Thanks, Bob Memler<br>
>><br><br>
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