Al
Have you tried riching the fuel mixture instead of changing the timing
pinging is a sign of to lean a mixture, who knows give it a try.
Spike
----- Original Message -----
From "Bob Woolner" <r_woolner at conknet.com>
To: "'spritelist'" <spridgets@autox.team.net>
Sent: Monday, May 08, 2000 3:47 PM
Subject: Head differences
> Al-
>
> Can you measure the cylinder head thickness of your original head?
(Easily
> done) Can you measure the cylinder head thickness of the installed
head?
> Much tougher to do, I know, but that would tell you IF signicant
shaving
> was done...
>
> I don't think you have a shaved head problem. I would bet it's
something
> else. Some things to think about ... Did it start as well as it
used to?
> Fire right up? Much higher compression, high enough that it would
cause
> significant pinging, wouldn't affect the start-ability of the
engine. In
> fact, as long as the starter could still turn it over quickly
enough, it
> should start EASIER.
> Or was it hard to start? If so, then the pinging is caused by
something
> else...Is it possible you have a significant vaccuum leak?
>
> Other things burning will also cause pinging... I had a Big Healey
once
> that had a leaky brake booster that would then allow brake fluid to
be
> sucked into the intake manifold and "burned", producing LOTS of
smoke and
> pinging...
>
> Burned automatic transmission fluid will also ping like crazy...
What do
> you use to top up your carb dampers? Is it possible they got WAY
over-filled?
>
> Any other changes to the engine or settings besides the cylinder
head swap?
>
> Bob Woolner
> HIllsboro, NH
>
> 70 midget
> and other stuff
>
> >From: "Tocci, Al" <atocci@advanta.com>
> >To: "'spritelist'" <spridgets@autox.team.net>
> >Subject: Head differences
> >Date: Mon, 8 May 2000 14:19:05 -0400
> >X-Mailer: Internet Mail Service (5.5.2650.21)
> > charset="iso-8859-1"
> >Sender: owner-spridgets@autox.team.net
> >Reply-To: "Tocci, Al" <atocci@advanta.com>
> >
> >Recently I removed the original head from my 1275 motor. I
replaced the
> >head with a redone unit from an Austin America (don't know the
casting
> >number). I have no reason to believe the new head was shaved any
> >significant amount. With the new head, the motor pings/detonates
like
> >crazy. To get the pinging to stop, I have to retard the timing so
far that
> >performance is absolutely horrible. My motor is the stock, higher
> >compression 1275 (8.8:1 I think) and I run premium gas. This was
never a
> >problem prior to the head swap. Any thoughts (other than redoing
the old
> >head)? Thanks...
> >
> >Al Tocci
> >Doylestown, PA
> >'66 Sprite
> >
> >
>
>
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