[Spridgets] Mega Squirt?

David Lieb 72spridget at gmail.com
Fri Mar 30 08:52:46 MDT 2018


Yeah, one of the quandaries of Spridget ownership for me is that the dual
SUs are simultaneously sexy and stupid. Logically, a single HS6 makes much
more sense. I just have a hard time convincing myself to do it. After all,
there is no end to THAT slippery slope.

On Fri, Mar 30, 2018, 09:34 Glen Byrns <grbyrns at gmail.com> wrote:

> I see what you mean  with two supply points for charge.  With the
> wet-turbo/single point injection, a constant supply of charge is equally
> supplied at each open intake valve.
> I'm using a 44lb Lucas injector that meters down to a nice smooth idle and
> plenty of fuel for full on, bury the pedal 10 lb boost.  The intake
> manifold is a relative simple log with no clever smoothing or branch-length
> computations. Welded out of iron gas pipe if the truth be told.  Proof of
> concept delivered when the stoplight goes green.
>
> One nice feature of Megasquirt is the ability to deal with the top end in
> a way that preserves the pistons.  I've set up fuel and timing tables to
> ramp up the enrichment and dial back the timing indexed to the boost.
> Lacking a waste-gate, I drawn the line in the sand with both fuel and
> timing tables.  As boost approaches 10 lbs or rpm hits 6.5k, Megasquirt
> starts to drop spark for a "soft limit".  Finally a set of pistons with a
> life measured in years instead of months!
>
> Glen
>
> > On Mar 30, 2018, at 6:50 AM, David Lieb <72spridget at gmail.com> wrote:
> >
> > Glen,
> > You have significantly reduced the issue by going single-point. The
> problem with dual-point, whether it be HS2 carbs or MegaSquirt, is that the
> engine is doing two pulses on one branch, then two pulses on the other
> branch. Makes it rather difficult to get the flow even or to deliver the
> same mixture in the same amount to each of the four cylinders.
> >
>
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