[Healeys] Crankshaft

Sat Oct 30 12:33:05 MDT 2021

Begs the question: Anyone make an aftermarket balancer for the 100s? Without looking, I think there’s enough room for one.

> On Oct 30, 2021, at 10:17 AM, Henry G Leach via Healeys <healeys at autox.team.net> wrote:
> 
> 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 <healeys at autox.team.net> 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 <healeys at autox.team.net> 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 <healeys-bounces at autox.team.net> on behalf of Bob Spidell via Healeys <healeys at autox.team.net>
>> Sent: Saturday, October 30, 2021 1:16 AM
>> To: richard mayor <boyracer466 at gmail.com>
>> Cc: healeys at autox.team.net <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 <healeys at autox.team.net> wrote:
>> 
>> 
>> But a lightened flywheel will get you there quicker.
>> 
>> On Fri, Oct 29, 2021 at 3:19 PM Michael Salter via Healeys <healeys at autox.team.net> 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, <healeys at autox.team.net> 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, <healeys at autox.team.net> 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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