Spark plug reading
Not sure what you are looking for?
Just checked the plugs today on the '89 D100 318
Stock original engine,
302 heads, stock roller cam
1406 Edelbrock 600 cfm carb
Mopar HEI conversion, E-Coil
Plugs are burning perfect.
1406 600 cfm carb is a good match for stock 318s, not over rich.
HEI conversion with the E-Coil gives a much hotter spark than stock, and holds a much lower rpm idle without wanting to die.
I would say if you have good compression and a tight upper end, the mopar HEI conversion and E-coil will burn the plugs clean.
So much so they recommend another .010ths on the plug gap because the hotter spark will jump the gap.
I am running .035 ths. stock plug gap. NGK GR4 V-Power plugs.
Crazy, these plugs came installed with the truck when I bought it last Winter. And it had been sitting in a pasture for 6 years not running.
Now take into consideration that this was run on the TBI factory system with onboard computer engine management . These plugs were no where near this white, in fact they were carboned up.
Cleaned them with carb cleaner and stainless steel wire brush and re-gapped to .035 ths. and reinstalled them.
The HEI and E-coil burned them this clean after the fact.
You can tell the plugs were carboned up by the carbon remains on the tip of the plug threads above.
Amazing.....
☆☆☆☆☆
Not sure what you are looking for?
Just checked the plugs today on the '89 D100 318
Stock original engine,
302 heads, stock roller cam
1406 Edelbrock 600 cfm carb
Mopar HEI conversion, E-Coil
Plugs are burning perfect.
1406 600 cfm carb is a good match for stock 318s, not over rich.
HEI conversion with the E-Coil gives a much hotter spark than stock, and holds a much lower rpm idle without wanting to die.
I would say if you have good compression and a tight upper end, the mopar HEI conversion and E-coil will burn the plugs clean.
So much so they recommend another .010ths on the plug gap because the hotter spark will jump the gap.
I am running .035 ths. stock plug gap. NGK GR4 V-Power plugs.
Crazy, these plugs came installed with the truck when I bought it last Winter. And it had been sitting in a pasture for 6 years not running.
Now take into consideration that this was run on the TBI factory system with onboard computer engine management . These plugs were no where near this white, in fact they were carboned up.
Cleaned them with carb cleaner and stainless steel wire brush and re-gapped to .035 ths. and reinstalled them.
The HEI and E-coil burned them this clean after the fact.
You can tell the plugs were carboned up by the carbon remains on the tip of the plug threads above.
Amazing.....
☆☆☆☆☆