SPICE model for a spark plug?

glen walpert <nospam@null.void> wrote:

> The idle control system on my 1961 Alfa Rojunko Spider was the usual stop 
> screw, but it was adjustable by rotating the choke knob, which pulled out 
> for choke.  Regular adjustment was necessary.  The car's best feature was 
> however the convenient lifting lug at the balance point of the engine/
> transmission combo for easy removal.  I could get that engine out in 
> under 30 minutes by the third or fourth time :-).

My first car was an English Anglia. Instead of blinking turn signals, it had 
two levers that swung out from either side that illuminated to show the 
direction of turn. These were a constant pain to maintain.

Removing the transmission to change the clutch was a bit more of a pain. I 
had to lift the car on jacks, slide underneath, then remove all the bolts to 
lift the transmission out. 

Later, when I started taking girls on dates and they told me they were horny, 
I could not believe that they would say such a thing in my car, which I 
regarded as sacred. It took me many years before I discovered my mistake.

> 
> .SUBCKT SPARK_GAP2 1 2 PARAMS: V_GLOW=1500 V_ARC=150 I_SUS=.002 
> V_BREAKDN=12000 I_ARC=.2 
> 
> * SINCE THE STRIKING IS VERY FAST, IT IS STRONGLY ADVISED 
> * TO SET TRTOL TO 1 VIA: .OPTIONS TRTOL=1 and ITL4=1000. THIS WILL 
> FORCE 
> * PSpice TO BE MORE VIGILANT IN THE VICINITY OF TRANSITIONS 
> * 
> * Documentation on the Sparkgap model can obtained from AEi Systems, 
> www.AENG.com, 310-216-1144, In...@AENG.com 
> * 
> D_D3 10 11 DZ_ARC 
> X_SARC 9 0 3 10 SPARK_GAP2_SARC 
> R_RT1 7 0 50 
> D_DT2 8 9 D1N4148 
> E_EBREAKDN_CONTROL 6 0 VALUE = {IF(ABS(V(1,2))>{V_BREAKDN} , 12 , 
> + IF( ABS(I(V_VSENSE)) > {I_SUS} , 12 , 0 ))} 
> D_D4 5 11 DZ_ARC 
> E_EARC_CONTROL 8 0 VALUE = { IF( ABS(I(V_VSENSE)) > {I_ARC} , 12 , 0 
> )} 
> D_D2 5 4 DZ_GLOW 
> V_VSENSE 5 2 DC 0 
> C_CT2 9 0 0.1U 
> R_RT2 9 0 50 
> C_CT1 7 0 0.25U 
> X_SBREAKDN 7 0 1 3 SPARK_GAP2_SBREAKDN 
> D_D1 3 4 DZ_GLOW 
> D_DT1 6 7 D1N4148 
> .MODEL DZ_GLOW D (BV={V_GLOW} IS=1U RS=5 IBV=10U) 
> .MODEL DZ_ARC D (BV={V_ARC} IS=1U RS=5 IBV=10U) 
> .MODEL D1N4148 D (RS=.8 CJO=4PF IS=7E-09 N=2 VJ=.6V 
> + TT=6E-09 M=.45 BV=100V) 
> .ENDS 
> .subckt SPARK_GAP2_SARC 1 2 3 4 
> XS_SBREAKDN 3 4 1 2 SWhyste Params: Ron=5 Roff=50MEG VT=10 VH=0 
> RS_SARC 1 2 1G 
> .ends 
> .subckt SPARK_GAP2_SBREAKDN 1 2 3 4 
> XS_SBREAKDN 3 4 1 2 SWhyste Params: Ron=5 Roff=50MEG VT=10 VH=0 
> RS_SBREAKDN 1 2 1G 
> .ends
> ...Jim Thompson 

The issue with the syntax is the line that starts ")}". This is a continuation line, and should be preceded by "+". Alternatively if you remove the line break and terminate the previous line "> {I_ARC}, 12,0,)}" the spice model will run. Good luck.