<html><body>One other important factor in smooth running, reliable engines is <b>balance</b> (some call it blueprinting but that encompasses many changes)<div><br></div><div>When the machine shop did my original crank, they first magnafluxed it, and then turned it to .020. I provided the flywheel, and front pulley, as well as the clutch cover and disc and they used those components to "balance" the engine. The markings on the flywheel and clutch were used in assembly to put all correctly in balanced position and the engine runs very smoothly, for a four, and sounds great. I would recommend this procedure when rebuilding.</div><div><br></div><div>Think about all the weight being thrown around at the rear of the engine, and just a small pulley up front. Adding more mass to the front can't be a bad thing, but if you do as Donald instructed, and don't rev over 4500RPMS when racing, the engine will last a long time. The 100 flywheel is one serious hunk of metal.</div><div><br></div><div>On the first 6-cyl. engines, Geoff Healey said if they revved it over 4000 they were afraid the vibration would blow apart. The went back to Morris Motors and the solution then was to thicken the back plate. I don't know much about the engineering of rotation but the word "smooth" seems to fit the best. Hank<br><div><div><br><div class="reply-new-signature"></div><p>-----------------------------------------</p>From: "WILLIAM B LAWRENCE" <ynotink@msn.com><br>To: "josef-eckert--- via Healeys", "Bob Spidell", "gradea1@charter.net", "josef-eckert@t-online.de"<br>Cc: <br>Sent: Saturday October 30 2021 10:17:08PM<br>Subject: Re: [Healeys] Crankshaft<br><br>
<div style="font-family:'segoe ui westeuropean', 'segoe ui', helvetica, arial, sans-serif;font-size:12pt;color:rgb(0,0,0);">
DW sells a vibration damper for the 4 cylinder. </div>
<div style="font-family:'segoe ui westeuropean', 'segoe ui', helvetica, arial, sans-serif;font-size:12pt;color:rgb(0,0,0);">
<br></div>
<div style="font-family:'segoe ui westeuropean', 'segoe ui', helvetica, arial, sans-serif;font-size:12pt;color:rgb(0,0,0);">
When I built my engine I used the belt pulley system from a six
because one of the vibration sources on the four is the heavy, old
school, implement belt that is standard. I found all three pulleys
fit with only a minor mod to the water pump pulley. It may be the
placebo effect but I really think the engine runs more smoothly
with the narrower belt. I considered using the vibration damper
from the six also, but it’s a little chancy to install one without
analyzing the vibration characteristics of the crank and matching
the damper to it. The DW damper is tailored to the four cylinder
crank.</div>
<div style="font-family:'segoe ui westeuropean', 'segoe ui', helvetica, arial, sans-serif;font-size:12pt;color:rgb(0,0,0);">
<br></div>
<div style="font-family:'segoe ui westeuropean', 'segoe ui', helvetica, arial, sans-serif;font-size:12pt;color:rgb(0,0,0);">
Bill Lawrence</div>
<div style="font-family:'segoe ui westeuropean', 'segoe ui', helvetica, arial, sans-serif;font-size:12pt;color:rgb(0,0,0);">
BN1 #554</div>
<hr style="width:98%;"><div dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt;" color="#000000"><b>From:</b> Healeys
<healeys-bounces@autox.team.net> on behalf of josef-eckert---
via Healeys <healeys@autox.team.net><br><b>Sent:</b> Saturday, October 30, 2021 6:44 PM<br><b>To:</b> Bob Spidell <bspidell@comcast.net>;
gradea1@charter.net <gradea1@charter.net><br><b>Cc:</b> healeys@autox.team.net
<healeys@autox.team.net><br><b>Subject:</b> Re: [Healeys] Crankshaft</font>
<div> </div>
</div>
<div>
<p style="margin:0px;"><span style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:#000000;text-decoration:none;">
Is there a need for one? Never needed one on my 100.<br></span></p>
<p style="margin:0px;"><span style="font-family:arial, helvetica, sans-serif;font-size:10pt;color:#000000;text-decoration:none;">
</span></p>
<p style="margin:0px;"> </p>
<p style="margin:0px;"> </p>
<p style="margin:0px;">-----Original-Nachricht-----</p>
<p style="margin:0px;">Betreff: Re: [Healeys] Crankshaft</p>
<p style="margin:0px;">Datum: 2021-10-30T20:34:14+0200</p>
<p style="margin:0px;">Von: "Bob Spidell via Healeys"
<healeys@autox.team.net></p>
<p style="margin:0px;">An: "gradea1@charter.net"
<gradea1@charter.net></p>
<p style="margin:0px;"> </p>
<p style="margin:0px;"> </p>
<p style="margin:0px;"> </p>
<div>
<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>On Oct 30, 2021, at 10:17 AM, Henry G Leach via Healeys
<healeys@autox.team.net> wrote:<br><br></blockquote>
</div>
<blockquote>
<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> </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="x_reply-new-signature"> </div>
<p style="margin:0px;">-----------------------------------------</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" style="margin:0px;"><span style="font-family: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</span></p>
<span style="font-family:Calibri;"><br><br>
On October 30, 2021, at 3:22 AM, Michael MacLean via Healeys
<healeys@autox.team.net> wrote:<br><br><br></span>
<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.</div>
<div>Mike MacLean</div>
</div>
<br><div class="x_gmail_quote">
<div class="x_gmail_attr" dir="ltr">On Fri, Oct 29, 2021 at 8:48 PM
WILLIAM B LAWRENCE via Healeys
<<a>healeys@autox.team.net</a>> wrote:</div>
<blockquote class="x_gmail_quote" style="margin:0px 0px 0px .8ex;border-left:1px solid #cccccc;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> </div>
<div>Bill Lawrence</div>
<div>BN1 #554</div>
<hr style="width:98%;"><div dir="ltr"><span style="font-size:11pt;color:#000000;font-family:Calibri, sans-serif;"><strong>
From:</strong> Healeys
<<a>healeys-bounces@autox.team.net</a>> on behalf of Bob
Spidell via Healeys <<a>healeys@autox.team.net</a>><br><strong>Sent:</strong> Saturday, October 30, 2021 1:16 AM<br><strong>To:</strong> richard mayor
<<a>boyracer466@gmail.com</a>><br><strong>Cc:</strong> <a>healeys@autox.team.net</a>
<<a>healeys@autox.team.net</a>><br><strong>Subject:</strong> Re: [Healeys] Crankshaft</span>
<div> </div>
</div>
<div>
<div dir="ltr"> </div>
<div dir="ltr">Does it de-stroke the engine (shorter throws)?</div>
<div dir="ltr"> </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.</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:</div>
<blockquote style="margin:0px 0px 0px .8ex;border-left:1px solid #cccccc;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:</div>
<blockquote style="margin:0px 0px 0px .8ex;border-left:1px solid #cccccc;padding-left:1ex;">
<div>
<p style="margin:0px;">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..</p>
<div>On 10/29/2021 3:25 PM, Michael Salter via Healeys wrote:</div>
<blockquote>
<div>Confirmation bias is a very powerful force.
<div> </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:</div>
<blockquote style="margin:0px 0px 0px .8ex;border-left:1px solid #cccccc;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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