<VV> What have you done to stop your engine from pinging?

[airvair at earthlink.net]

On a 110/manual, I tried the "mill the step out" procedure, along with
octane cutting the pistons to compensate for the higher compression milling
the head would cause. The result was that it STILL needed premium gas. Not
that it would knock on regular, but that it developed horrible dieseling
problems. The crap we get for gas today, with corn ethenol in it, precludes
any advantage that the "mill the step out" procedure might have had.

-Mark


> [Original Message]
> Subject: Re: <VV> What have you done to stop your engine from pinging?
>
> "...Cutting out the head gasket step - without step-cutting the  piston.  
> Agressive deflashing of the heads with a 1/8" drill. Approximately 
10.5:1 
> compression 140 engine with no pinging..."
>  
> Yes, forgot to mention: de-flashing cooling fins is mandatory. Also, I  
> believe (and perhaps other experts will chime in) 110s are the most
likely to  
> knock and ping, while 140s are the most forgiving. Both my tight quench 
> engines  are 110s; and, following reducing the quench distance to .032,
both had 
>  combustion chambers set to 9.5:1 (One by cutting opposite quench side
top 
> of  forged pistons, the other by removing material from the heads away
from 
> the  quench area; both were final Cced, and both methods seem to work 
> equally well.).  Chose not to get to aggressive with compression ratio
as: 1) both 
> have AC; 2)  Are Powerglide-equipped; and are driven in hot, Florida.
Also, 
> the 67 coupe has  a 327 diff, partially compensated for with a converter 
> modified for a slightly  higher stall speed. This vehicle is also driven
much 
> leaner than  stock, consistently just a "tick either side of 14.7 (as 
> verified,  real-time, using wide band O2 meters). 
>  
> Regards,
> Mike Mauro
>