I notice that many of the other VE applications have a cable-operated manual cold-start-advance, instead of the KSB that we have.

I can see several advantages to this.

Has anyone converted one of our VE-pumps to the cable advance ??

Any comments as to the pros and cons ??

Thanks.

 

I don't think it's a pro/con sort of thing, rather personal taste. I think it'd be cool to have one more pull cable in the cab

 

Well, the KSB changes the fuel pressure correct?
Wouldnt this be sorta the same thing as a valet switch?
I have read here that running with the KSB engaged( fuel pressure increased) could potentialy crack the pump casing..

 

Actually, if I understand the bosch VE manual correctly, the cable operated timing advance moves the timing piston to the advanced position by directly pushing on the piston, thus over coming the compression spring holding the timing piston in the "retarded" position.

In the end the KSB accomplishes the same thing by increasing the case pressure in order to push the timing piston the the "advanced" position using pressure.

So with the cable operated deal you could actually increase your timing without increasing your case pressure.

 

vw have cable cold start, sometimes i forget to push it back in ,cant realey tell any differance in power.

 

It's hard to tell the difference between 52 HP and 54 HP.

 

What I can't figure out is how that when you rotate that bottom cross-ways cylinder, it rotates the roller-plate gizmo to advance/retard timing.

I can't get it in my head how it works without binding things up.

 

BK- the plate is stationary, and the rollers roll around on it. The cylinder is, for purposes here, attached to the bottom of the plate; the rollers are in time with the shaft. Move the cylinder, and you rotate the plate, changing the dynamic timing.

Daniel

 

Also you have to remember, that the cold start advance is only equal to the timing at about 1500 rpm or so -- once you are running faster than that it doesn't make any difference. There are graphs describing this on pages 42-43 of the Bosch VE manual . . . You would have to really be starving the pump for fuel hard to draw the case pressure down enough for the mechanical advance to be of any advantage at high speed operation.