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<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>
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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>
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<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="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" 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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