Are these numbers theoretical, or from actual dyno?
I'm very curious about how that design could out-perform the later design.
Wilko
On Sep 6, 2015, at 1:05 AM, Andy Thorp wrote:
> Since it is a bit quiet, here's something I've been playing with over the
> (southern hemisphere) winter. I was always interested in just how "bad" the
> Longbridge gallery head was given that it is pretty much the same layout as
> the later ones with two carbs and a log manifold channeling air through a
> series of abrupt 90 degree bends. The biggest improvement in the later head
> is the bigger valves, and when these are fitted to the gallery head with
> chambers and ports relieved accordingly, the air flow rises to above the
> stock 3000 setup. The exhaust is a little different though- the 3000 exhaust
> valve is too big and reduces flow due to bore/block shrouding. Hoping for
> 125hp from an otherwise stock Longbridge engine this summer once it is all
> back together.
>
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