Timing questions

[cummins12club]

If ur at 14 degrees w the pump to the head and a timing device then what the heck is stock timing?

[Sutter1stgen]

I don't know if it matters???? But with the m&h spacer installed, I was at 14 degrees with the pump to the head at idle. And with the ksb flipped on i was at 21 degrees at idle. This was checked with a light.

7 degrees is a significant amount, I think.
Not sure that it's that many degrees of a difference at road speed, though.

Mark.

I thought the same thing too. That's why I made sure I put that it was at idle. But as rpm rises I'm pretty sure the gap would close up a little. Stomp checked it for me. He has mechanical skills far superior to I. I was cool to see the difference it made.

[RCCUMMINS89]

I have been told that in stock form, the injection pump can give upwards of 6 crank degrees of timing advance.

Also have been told that with the spacer it can give upwards of 10, that I'm not sure on.

Now, don't non i/c trucks have slightly less factory timing than i/c trucks?

[AHineman]

It's the other way around. Non intercooled is 1.45 mm and intercooled is 1.25 mm.

[RCCUMMINS89]

Well according to that, i/c stock would be roughly 12 degrees, and non would be in the 14 range. correct????????

[AHineman]

That's how I understand it, but have never put a light on it.

[RCCUMMINS89]

I know when Jason checked his he was at 9 once.....

I wonder if larger injectors and higher pop pressures is why some have advanced timing, yet not really?

[AHineman]

I think so, but have never got to check it with a light. To the head with stockers rattles a lot. Not so much with 6x .016s. I run mine one tooth advanced and stock pump location.

[Sutter1stgen]

I think so, but have never got to check it with a light. To the head with stockers rattles a lot. Not so much with 6x .016s. I run mine one tooth advanced and stock pump location.

This roughly where I run mine. I still have the ksb on a switch. But with it flipped on it's just too much. I'm also running the spacer. I know Bc847 was running +2 teeth, but i dont think my truck will take a step forward with that setup of timing. Thanks for the info in your post ( rccummins89 & Ahineman)

[AHineman]

I have mine on a 3 position switch. Up is on, middle is off, down is on via a pressure switch set for 20 psi of boost.

[RCCUMMINS89]

Nice....I like that

I run a tooth advanced, the spacer, no ksb shims, and retarded about an 1/8". Runs smooth and good through the power band, except it does pick up a little rattle around the 2100-2300 mark. If I flip on the ksb, it's WAY WAY WAY too much timing.

[Sutter1stgen]

Now that's a pretty slick setup. How well do your twins cool your 6x16s? And is your power screw turned all of the way in? Sorry to derail.

[AHineman]

Pump is benched at 335 ccs. Max rpms 4400. Vallet off, empty, being rough on it = 1250 degrees max. Most I've towed so far is a little over 14k gross. With vallet switch on, 1000 degrees max. Most boost I've seen is 68 psi overall and 34+ out of the primary.

[RCCUMMINS89]

What's John charge (or charged) to go through a 12mm pump

[AHineman]

It was a new pump from Bosch. Can't remember for sure without digging out the invoice, but comparable to Schied.