<VV> Detonation

[Ron]

You need a manual spark advance lever on the steering column just like the 
old Fords had.
RonH

----- Original Message ----- 
From: "Richard Widman" <richard at widman.biz>
To: <virtualvairs at corvair.org>
Sent: Saturday, May 12, 2007 2:56 PM
Subject: <VV> Detonation


> The vacuum advance should not be pinched off.
>
> Run a tank or 2 of gas with Techron fuel system cleaner to get carbon off
> the pistons and heads, clean and deflash your heads and cylinders, check 
> for
> the right mixture.
>
> Pinging is from hot deposits igniting the mixture too far before TDC.
> Deposits maintain heat and reduce the cylinder space, increasing 
> compression
> to where you either need to get rid of them or move up to higher octane 
> gas
> to retard the rate of ignition.  Pings cause damage to engine by pushing
> backwards on the crankshaft.
>
> Reconnect the vacuum line and retard the timing slightly until there is no
> ping.  Then run the tanks with Techron and see if you can advance the 
> timing
> any.  The correct timing is what gives you the best power without ping for
> your given altitude and octane.  The higher you go with either of those, 
> the
> more advance you should have to get the most power and least damage.  I 
> have
> always used the timing spec as a starting point.  There have been days 
> when
> I've advanced the timing 3 times on a trip that increased 10,000 ft in
> altitude during the day, retarding it on the way back.
>
>
>
>
>
> ------------------------
>
> Richard Widman
>
> www.widman.biz
>
>
>
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