[Elarson]

Taking timing out will move the color closer to the base.
When we ran the Grocery Getter, the nitrous experts recommended tuning the timing to put the color at the bend. We beat up a lot of pistons following that advice. Then started retarding the timing and every bit that we took out made it faster and easier on pistons. When the pistons were happy, the color was at the base of the ground strap.

FWIW:
Eric

[Tom Vaught]

Originally Posted by Elarson

Taking timing out will move the color closer to the base.
When we ran the Grocery Getter, the nitrous experts recommended tuning the timing to put the color at the bend. We beat up a lot of pistons following that advice. Then started retarding the timing and every bit that we took out made it faster and easier on pistons. When the pistons were happy, the color was at the base of the ground strap.

FWIW:
Eric

I have seen a lot of engines killed by 1 degree too much timing and a lot of very fast engines (with happy pistons) when the timing was a lot less than what many thought it should be.

I have seen a several boosted engines make excellent power with less that 10 degrees of timing at max boost and max rpm.

Tom V.

[grandville455]

Originally Posted by Elarson

Taking timing out will move the color closer to the base.
When we ran the Grocery Getter, the nitrous experts recommended tuning the timing to put the color at the bend. We beat up a lot of pistons following that advice. Then started retarding the timing and every bit that we took out made it faster and easier on pistons. When the pistons were happy, the color was at the base of the ground strap.

FWIW:
Eric

I thought less timing would move that mark more towards the tip and not the base? That's how i've always understood it atleast

[bluegoat65]

Originally Posted by grandville455

I thought less timing would move that mark more towards the tip and not the base? That's how i've always understood it atleast

x2 here

[Elarson]

Originally Posted by grandville455

I thought less timing would move that mark more towards the tip and not the base? That's how i've always understood it atleast

Yes, you're correct. I said it backwards.
Retarding the timing reduces the temperature in the chamber and causes less cooking of the groundstrap; so the color band moves out toward the tip. The base of the strap sinks heat into the metal shell and stays cooler.

Grocery Getter ran best with almost no "blue" on the ground strap.

Sorry for the confusion...
Eric