[Healeys] Crankshaft

gradea1 at charter.net gradea1 at charter.net
Sat Oct 30 11:11:35 MDT 2021


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).
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

	-----------------------------------------From: "David Porter via
Healeys" 
To: "Michael MacLean", "healeys at autox.team.net"
Cc: 
Sent: Saturday October 30 2021 4:20:15AM
Subject: Re: [Healeys] Crankshaft

	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


 On October 30, 2021, at 3:22 AM, Michael MacLean via Healeys  wrote:

  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.
 Mike MacLean

 On Fri, Oct 29, 2021 at 8:48 PM WILLIAM B LAWRENCE via Healeys 
wrote:
   I’d say it doesn’t transform the engine by itself, but it
provides a stronger basis for the other mods that will. 
 Bill Lawrence BN1 #554 
-------------------------
 FROM: Healeys  on behalf of Bob Spidell via Healeys 
SENT: Saturday, October 30, 2021 1:16 AM
TO: richard mayor 
CC: healeys at autox.team.net 
SUBJECT: Re: [Healeys] Crankshaft      Does it de-stroke the engine
(shorter throws)? 

On Oct 29, 2021, at 5:05 PM, richard mayor via Healeys  wrote:

    But a lightened flywheel will get you there quicker.

 On Fri, Oct 29, 2021 at 3:19 PM Michael Salter via Healeys  wrote:
  David, how does changing the crankshaft give you 2000 additional
RPM? 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.  M  
 On Fri., Oct. 29, 2021, 6:03 p.m. David P via Healeys,  wrote:

	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..
 On 10/29/2021 3:25 PM, Michael Salter via Healeys wrote:
  Confirmation bias is a very powerful force. 
 M  
 On Fri., Oct. 29, 2021, 3:35 p.m. Bob Spidell via Healeys,  wrote:
  OK, I'll bite: How does a Welch crank transform a a 100? I get that
 they're steel and stronger, and should withstand more RPM/HP, but
does
 the crank alone do it?

 Bob

 On 10/29/2021 8:10 AM, David P via Healeys wrote:
 >
 > pretty much hen's teeth is my guess. But a Welsh crank, it
transforms
 > the engine. IMHO I'm sure Donald wishes they were available in '54
 >
 > On 10/28/2021 2:29 PM, Robert Memler via Healeys wrote:
 >> I need a crankshaft for a 54 b;no. Does anyone have a spare that
they
 >> would be willing to sell?
 >>
 >> Thanks, Bob Memler
 >>

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