[Healeys] Crankshaft

[David Porter]

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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