pining,twin plugging,etc...

[Alain Toussaint]

i've been thinking a lot lately and i got an idea i'm not sure if worth
doing,you know mostly what pining is (the way of putting an end to a crack
in a iron cylinder head),for those who dont know,the trick is drilling a
smale hole where the crack end (serve as a guide for another step of
drilling),drilling a second time on the first hole with a big enough drill
bit (needed for putting a screw in the hole),you do the fillet (for the
screw),you put the screw on (i dont know if you also put rtv on it),
you trim the screw so it dont protrude further in the combustion chamber
(and potentially hitting the piston),you do likewise on the upside of the
head (the valvetrain side) and presto,you put an end to a crack,but,i've
been thinking of another purpose of pining,as a good way to put a second
spark plug in a cylinder head,say,you do the afformentionned step but
where you drill for the screw (with the big drill bit) you use one big
enough for putting a (exemple) 16 millimeter (2/3 inch) screw in the
head,and then,you drill another hole in the screw (say,10 millimeter) for
putting the spark plug in it (i think ngk make motorcycle spark plug of
this size),someone in magazine has done it (not by the pinning way but i
did put a second spark plug in a pinto motor,it's a UK magazine),the pinto
in question was doing nearly 200 hp at the crank (i dont know how they do
that though !!!) on his normal set of plug enabled,when testing,he put the
second plug set in use,the motor jumped straight from 2200 rpm to 2600
rpm, according to the mag,the motor was set up at 25 degree static timing
(BTDC) and the fuel was not dialled in (it was just a test for determining
if the mod would be effective),he did some high rpm/high load pull to
it,but the operator stopped at 5000 rpm because the motor was showing sign
of detonation,they had to dial back the timing at around 20 degree (i
think,not sure),and,when they got a good pull,the power was around 206.6
hp (still with the timing and the fuel undialled),so here's my thinking:

1-:this mod would be more effective on a turbo motor (could reduce
detonation),but the cylinder pressure would be big (but then,the mag would
has demonstrated pining was doing it in a blown hemi motor).

2-:does it would be a good mod on a naturally aspirated motor ??
considering the 6 to 8 hp increase on the pinto motor,it seem not but
scratch further and there's sign of potential,the motor was not dialled
in.

3-:according to the mag,the motor was having excellent trottle response,it
seem to them as the motor was running without flywheel.

so to anyone here,does it make sense or i'm better wearing a cone shaped
hat ???

Alain Toussaint