Great read Michael.
On Wed, Jan 4, 2017 at 1:16 AM, Michael MacLean <rrengineer.mike at att.net>
wrote:
> OK, you guys have me sufficiently scared to finish putting this stock
> 100-4 engine together only to have it grenade the crank somewhere down the
> road. Probably when I am at the furthest point from home.
> Mike MacLean
>
>
> On Tuesday, January 3, 2017 3:16 PM, Bob Spidell <bspidell at comcast.net>
> wrote:
>
>
>
>
> Very useful info, as always. Was wondering how much 'de-stroking' the
> engine--shorter piston/rod thows--would help? Of course, you'd need to
> source yet another type of crankshaft, conrods, etc..
>
> Bob
>
>
> On 1/3/2017 1:23 PM, Austin Healeys List wrote:
> > Thanks for the interesting breakfast read Michael.
> >
> > You don't mention much about vibration dampers, particularly tuned vs
> > non-tuned. The factory rubber-bonded style damper only works correctly
> > on the engine it came off as it can only damp one specific frequency.
> > There are a host of aftermarket designs that use viscous fluid or
> > 'rattler' pucks to achieve damping at any frequency and regardless of
> > engine type. I believe guys are even making them to go on the flywheel
> > to damp vibes at both ends. For a relatively simple piece of
> > engineering, their prices seem to be based on "it is still cheaper
> > than a blown up engine".
> >
> > Another thing that doesn't get much mention and is a direct result of
> > crankshaft torsional flex is timing scatter. The vibrations find their
> > way through the cam chain and into the distributor where they react
> > with the flyweights and other parts so the timing, and equally
> > importantly the dwell can vary wildly at high rpm. I heard that some
> > Chrysler V engines with the distributor at the back will explode the
> > flyweights if fitted with a gear drive cam since the chain dampens out
> > a fair amount of vibration. The BMC six cylinder timing marks will
> > scatter around an inch or so at high speed, more when suddenly closing
> > the throttle as this is where the most crankshaft stress occurs.
> >
> > Andy.
> >
> > On 1/4/17, Michael Salter <michaelsalter at gmail.com> wrote:
> >> New post on my blog about Austin Healey 100 crankshafts...
> >> <http://www.netbug.net/blogmichael/2017/01/03/austin-
> healey-100-crank-failures/>
> >>
> >> ?M
> >> ?ichael S
> >> BN1 #174?
> >>
>
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